linux-kernel - [PATCH 10/12] amd-iommu: disable round-robin allocator for CONFIG_IOMMU

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Date:	Fri, 22 May 2009 14:21:31 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
CC:	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 10/12] amd-iommu: disable round-robin allocator for CONFIG_IOMMU_STRESS

[ impact: put high load on iommu tlb to find stale entry bugs ]

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 31d56c3..543822b 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -783,6 +783,11 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
 {
 	unsigned long address;
 
+#ifdef CONFIG_IOMMU_STRESS
+	dom->next_address = 0;
+	dom->need_flush = true;
+#endif
+
 	address = dma_ops_area_alloc(dev, dom, pages, align_mask,
 				     dma_mask, dom->next_address);
 
-- 
1.6.3.1


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