linux-kernel - [PATCH 4/9] x86/iommu: change SWIOTLB to use dma

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Date:	Mon, 22 Sep 2008 20:21:16 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	iommu@...ts.linux-foundation.org
CC:	David Woodhouse <dwmw2@...radead.org>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	Amit Shah <amit.shah@...ranet.com>,
	Ingo Molnar <mingo@...hat.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 4/9] x86/iommu: change SWIOTLB to use dma_ops register interface

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/pci-dma.c        |    6 +++++-
 arch/x86/kernel/pci-swiotlb_64.c |   16 +++++++++++++++-
 include/asm-x86/swiotlb.h        |    1 +
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index c783b73..b990fb6 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -156,7 +156,7 @@ void __init pci_iommu_alloc(void)
 
 	amd_iommu_detect();
 
-	pci_swiotlb_init();
+	pci_swiotlb_detect();
 }
 
 unsigned long iommu_num_pages(unsigned long addr, unsigned long len)
@@ -296,6 +296,10 @@ static int __init pci_iommu_init(void)
 
 	gart_iommu_init();
 
+#ifdef CONFIG_X86_64
+	pci_swiotlb_init();
+#endif
+
 	no_iommu_init();
 	return 0;
 }
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
index c4ce033..26747e0 100644
--- a/arch/x86/kernel/pci-swiotlb_64.c
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -18,6 +18,12 @@ 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);
 }
 
+static int
+swiotlb_device_supported(struct device *hwdev)
+{
+	return 1;
+}
+
 struct dma_mapping_ops swiotlb_dma_ops = {
 	.mapping_error = swiotlb_dma_mapping_error,
 	.alloc_coherent = swiotlb_alloc_coherent,
@@ -33,9 +39,10 @@ struct dma_mapping_ops swiotlb_dma_ops = {
 	.map_sg = swiotlb_map_sg,
 	.unmap_sg = swiotlb_unmap_sg,
 	.dma_supported = NULL,
+	.device_supported = swiotlb_device_supported,
 };
 
-void __init pci_swiotlb_init(void)
+void __init pci_swiotlb_detect(void)
 {
 	/* don't initialize swiotlb if iommu=off (no_iommu=1) */
 	if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
@@ -45,6 +52,13 @@ void __init pci_swiotlb_init(void)
 	if (swiotlb) {
 		printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
 		swiotlb_init();
+	}
+}
+
+void __init pci_swiotlb_init(void)
+{
+	if (swiotlb) {
+		x86_register_dma_ops(&swiotlb_dma_ops, DMA_OPS_TYPE_SOFT);
 		dma_ops = &swiotlb_dma_ops;
 	}
 }
diff --git a/include/asm-x86/swiotlb.h b/include/asm-x86/swiotlb.h
index 2730b35..20dfcb0 100644
--- a/include/asm-x86/swiotlb.h
+++ b/include/asm-x86/swiotlb.h
@@ -45,6 +45,7 @@ extern int swiotlb_force;
 
 #ifdef CONFIG_SWIOTLB
 extern int swiotlb;
+extern void pci_swiotlb_detect(void);
 extern void pci_swiotlb_init(void);
 #else
 #define swiotlb 0
-- 
1.5.6.4


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