[PATCH 04/15] swiotlb: remove unnecessary swiotlb_bus_to_virt

swiotlb_bus_to_virt is unncessary; we can use swiotlb_bus_to_phys and
phys_to_virt instead.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...>
---
 arch/powerpc/kernel/dma-swiotlb.c |   10 ----------
 lib/swiotlb.c                     |   34 ++++++++++++++++------------------
 2 files changed, 16 insertions(+), 28 deletions(-)

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 68ccf11..41534ae 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -24,16 +24,6 @@
 int swiotlb __read_mostly;
 unsigned int ppc_swiotlb_enable;
 
-void *swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t addr)
-{
- unsigned long pfn = PFN_DOWN(swiotlb_bus_to_phys(hwdev, addr));
- void *pageaddr = page_address(pfn_to_page(pfn));
-
- if (pageaddr != NULL)
- return pageaddr + (addr % PAGE_SIZE);
- return NULL;
-}
-
 dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
 {
  return paddr + get_dma_direct_offset(hwdev);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index dc1cd1f..1a89c84 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -130,11 +130,6 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
  return swiotlb_phys_to_bus(hwdev, virt_to_phys(address));
 }
 
-void * __weak swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t address)
-{
- return phys_to_virt(swiotlb_bus_to_phys(hwdev, address));
-}
-
 int __weak swiotlb_arch_address_needs_mapping(struct device *hwdev,
        dma_addr_t addr, size_t size)
 {
@@ -307,9 +302,10 @@ 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(char *addr)
+static int is_swiotlb_buffer(phys_addr_t paddr)
 {
- return addr >= io_tlb_start && addr < io_tlb_end;
+ return paddr >= virt_to_phys(io_tlb_start) &&
+ paddr < virt_to_phys(io_tlb_end);
 }
 
 /*
@@ -582,11 +578,13 @@ EXPORT_SYMBOL(swiotlb_alloc_coherent);
 
 void
 swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
-      dma_addr_t dma_handle)
+      dma_addr_t dev_addr)
 {
+ phys_addr_t paddr = swiotlb_bus_to_phys(hwdev, dev_addr);
+
  WARN_ON(irqs_disabled());
- if (!is_swiotlb_buffer(vaddr))
- free_pages((unsigned long) vaddr, get_order(size));
+ if (!is_swiotlb_buffer(paddr))
+ free_pages((unsigned long)vaddr, get_order(size));
  else
  /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
  do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
@@ -671,19 +669,19 @@ EXPORT_SYMBOL_GPL(swiotlb_map_page);
 static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
  size_t size, int dir)
 {
- char *dma_addr = swiotlb_bus_to_virt(hwdev, dev_addr);
+ phys_addr_t paddr = swiotlb_bus_to_phys(hwdev, dev_addr);
 
  BUG_ON(dir == DMA_NONE);
 
- if (is_swiotlb_buffer(dma_addr)) {
- do_unmap_single(hwdev, dma_addr, size, dir);
+ if (is_swiotlb_buffer(paddr)) {
+ do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
  return;
  }
 
  if (dir != DMA_FROM_DEVICE)
  return;
 
- dma_mark_clean(dma_addr, size);
+ dma_mark_clean(phys_to_virt(paddr), size);
 }
 
 void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
@@ -708,19 +706,19 @@ static void
 swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
     size_t size, int dir, int target)
 {
- char *dma_addr = swiotlb_bus_to_virt(hwdev, dev_addr);
+ phys_addr_t paddr = swiotlb_bus_to_phys(hwdev, dev_addr);
 
  BUG_ON(dir == DMA_NONE);
 
- if (is_swiotlb_buffer(dma_addr)) {
- sync_single(hwdev, dma_addr, size, dir, target);
+ if (is_swiotlb_buffer(paddr)) {
+ sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
  return;
  }
 
  if (dir != DMA_FROM_DEVICE)
  return;
 
- dma_mark_clean(dma_addr, size);
+ dma_mark_clean(phys_to_virt(paddr), size);
 }
 
 void
--
1.6.0.6

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