linux-kernel - [PATCH 7/8] pci-nommu: add map

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1231166848-20149-8-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Date:	Mon,  5 Jan 2009 23:47:27 +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 7/8] pci-nommu: add map_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.

We will remove map_single hook in the last patch in this patchset.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
 arch/x86/kernel/pci-nommu.c |   20 ++++++++++++++------
 1 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index c70ab5a..5a73a82 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -25,18 +25,25 @@ check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
 	return 1;
 }
 
-static dma_addr_t
-nommu_map_single(struct device *hwdev, phys_addr_t paddr, size_t size,
-	       int direction)
+static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
+				 unsigned long offset, size_t size,
+				 enum dma_data_direction dir,
+				 struct dma_attrs *attrs)
 {
-	dma_addr_t bus = paddr;
+	dma_addr_t bus = page_to_phys(page) + offset;
 	WARN_ON(size == 0);
-	if (!check_addr("map_single", hwdev, bus, size))
-				return bad_dma_address;
+	if (!check_addr("map_single", dev, bus, size))
+		return bad_dma_address;
 	flush_write_buffers();
 	return bus;
 }
 
+static dma_addr_t nommu_map_single(struct device *hwdev, phys_addr_t paddr,
+				   size_t size, int direction)
+{
+	return nommu_map_page(hwdev, pfn_to_page(paddr >> PAGE_SHIFT),
+			      paddr & ~PAGE_MASK, size, direction, NULL);
+}
 
 /* Map a set of buffers described by scatterlist in streaming
  * mode for DMA.  This is the scatter-gather version of the
@@ -83,6 +90,7 @@ struct dma_mapping_ops nommu_dma_ops = {
 	.free_coherent = nommu_free_coherent,
 	.map_single = nommu_map_single,
 	.map_sg = nommu_map_sg,
+	.map_page = nommu_map_page,
 	.is_phys = 1,
 };
 
-- 
1.6.0.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/