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amd-iommu: disable round-robin allocator for CONFIG_IOMMU_STRESS

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Disabling the round-robin allocator results in reusing the same
dma-addresses again very fast. This is a good test if the iotlb flushing
is working correctly.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-05-22 12:27:53 +02:00
parent d9cfed9254
commit fe16f088a8
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/amd_iommu.c
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@ -783,6 +783,11 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
{ {
unsigned long address; 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, address = dma_ops_area_alloc(dev, dom, pages, align_mask,
dma_mask, dom->next_address); dma_mask, dom->next_address);