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    Subject[PATCH 12/12] amd-iommu: don't free dma adresses below 512MB with CONFIG_IOMMU_STRESS
    Date
    [ impact: stress test automatic aperture enlargement code ]

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.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 33434c4..04ff5ec 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -824,6 +824,11 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,

    BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);

    +#ifdef CONFIG_IOMMU_STRESS
    + if (i < 4)
    + return;
    +#endif
    +
    if (address >= dom->next_address)
    dom->need_flush = true;

    --
    1.6.3.1



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