linux-kernel - [PATCH 3/9] x86/iommu: change PCI-NOMMU to use dma

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Date:	Mon, 22 Sep 2008 20:21:15 +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 3/9] x86/iommu: change PCI-NOMMU to use dma_ops register interface

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/pci-nommu.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 1c1c98a..0cbecb9 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -115,16 +115,28 @@ static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
 	free_pages((unsigned long)vaddr, get_order(size));
 }
 
+static int nommu_device_supported(struct device *dev)
+{
+	return 1;
+}
+
 struct dma_mapping_ops nommu_dma_ops = {
 	.alloc_coherent = nommu_alloc_coherent,
 	.free_coherent = nommu_free_coherent,
 	.map_single = nommu_map_single,
 	.map_sg = nommu_map_sg,
+	.device_supported = nommu_device_supported,
 	.is_phys = 1,
 };
 
 void __init no_iommu_init(void)
 {
+	/*
+	 * we always want nommu to be the last fallback if no
+	 * other dma_ops implementation feels responsible
+	 */
+	x86_register_dma_ops(&nommu_dma_ops, DMA_OPS_TYPE_SOFT);
+
 	if (dma_ops)
 		return;
 
-- 
1.5.6.4


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