[PATCH 2/8] swiotlb: add map_page and unmap_page

From: FUJITA Tomonori
Date: Mon Jan 05 2009 - 09:51:39 EST


This is a preparation of struct dma_mapping_ops unification. We use
map_page and unmap_page instead of map_single and unmap_single.

This is sorta temporary workaround. We will move them to lib/swiotlb.c
to enable x86's swiotlb code to directly use them.

We will remove map_single and unmap_single hooks in the last patch in
this patchset.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
arch/x86/kernel/pci-swiotlb_64.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
index d59c917..d1c0366 100644
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -45,6 +45,23 @@ swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
}

+/* these will be moved to lib/swiotlb.c later on */
+
+static dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ return swiotlb_map_single(dev, page_address(page) + offset, size, dir);
+}
+
+static void swiotlb_unmap_page(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ swiotlb_unmap_single(dev, dma_handle, size, dir);
+}
+
static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags)
{
@@ -71,6 +88,8 @@ struct dma_mapping_ops swiotlb_dma_ops = {
.sync_sg_for_device = swiotlb_sync_sg_for_device,
.map_sg = swiotlb_map_sg,
.unmap_sg = swiotlb_unmap_sg,
+ .map_page = swiotlb_map_page,
+ .unmap_page = swiotlb_unmap_page,
.dma_supported = NULL,
};

--
1.6.0.6

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