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powerpc: remove unncesary swiotlb_arch_address_needs_mapping

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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>
This commit is contained in:
FUJITA Tomonori 2009-07-10 10:04:59 +09:00
parent b9394647ac
commit 30945fdf6a
1 changed files with 1 additions and 26 deletions
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27
arch/powerpc/kernel/dma-swiotlb.c
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@ -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);
return 0;
}
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);
}
/*
* 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,