linux-kernel - [PATCH 2/8] swiotlb: add map_page and unmap

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Date:	Mon,  5 Jan 2009 23:47:22 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: [PATCH 2/8] swiotlb: add map_page and unmap_page

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@....ntt.co.jp>
---
 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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