powerpc: remove unncesary swiotlb_arch_address_needs_mapping

swiotlb doesn't use swiotlb_arch_address_needs_mapping(); it uses
dma_capalbe(). We can remove unnecessary
swiotlb_arch_address_needs_mapping().

We can remove swiotlb_addr_needs_map() and is_buffer_dma_capable() in
swiotlb_pci_addr_needs_map() too; dma_capable() handles the features
that both provide.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Becky Bruce <beckyb@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 41534ae2f5895f8a4adf48f7541ba22b4f518b18..a3bbe02cda98110cbbf267898e489f0e581cdf13 100644 (file)
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -35,29 +35,12 @@ phys_addr_t swiotlb_bus_to_phys(struct device *hwdev, dma_addr_t baddr)
        return baddr - get_dma_direct_offset(hwdev);
 }
 
-/*
- * Determine if an address needs bounce buffering via swiotlb.
- * Going forward I expect the swiotlb code to generalize on using
- * a dma_ops->addr_needs_map, and this function will move from here to the
- * generic swiotlb code.
- */
-int
-swiotlb_arch_address_needs_mapping(struct device *hwdev, dma_addr_t addr,
-                                  size_t size)
-{
-       struct dma_mapping_ops *dma_ops = get_dma_ops(hwdev);
-
-       BUG_ON(!dma_ops);
-       return dma_ops->addr_needs_map(hwdev, addr, size);
-}
-
 /*
  * Determine if an address is reachable by a pci device, or if we must bounce.
  */
 static int
 swiotlb_pci_addr_needs_map(struct device *hwdev, dma_addr_t addr, size_t size)
 {
-       u64 mask = dma_get_mask(hwdev);
        dma_addr_t max;
        struct pci_controller *hose;
        struct pci_dev *pdev = to_pci_dev(hwdev);
@@ -69,16 +52,9 @@ swiotlb_pci_addr_needs_map(struct device *hwdev, dma_addr_t addr, size_t size)
        if ((addr + size > max) | (addr < hose->dma_window_base_cur))
                return 1;
 
-       return !is_buffer_dma_capable(mask, addr, size);
-}
-
-static int
-swiotlb_addr_needs_map(struct device *hwdev, dma_addr_t addr, size_t size)
-{
-       return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
+       return 0;
 }
 
-
 /*
  * At the moment, all platforms that use this code only require
  * swiotlb to be used if we're operating on HIGHMEM.  Since
@@ -94,7 +70,6 @@ struct dma_mapping_ops swiotlb_dma_ops = {
        .dma_supported = swiotlb_dma_supported,
        .map_page = swiotlb_map_page,
        .unmap_page = swiotlb_unmap_page,
-       .addr_needs_map = swiotlb_addr_needs_map,
        .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
        .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
        .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,