Merge branches 'dma-debug/next', 'amd-iommu/command-cleanups', 'amd-iommu/ats' and...

[cascardo/linux.git] / arch / x86 / kernel / amd_iommu_init.c

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 047905d..28b0781 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -137,6 +137,7 @@ int amd_iommus_present;
 
 /* IOMMUs have a non-present cache? */
 bool amd_iommu_np_cache __read_mostly;
+bool amd_iommu_iotlb_sup __read_mostly = true;
 
 /*
  * The ACPI table parsing functions set this variable on an error
@@ -687,6 +688,9 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu)
                                        MMIO_GET_LD(range));
        iommu->evt_msi_num = MMIO_MSI_NUM(misc);
 
+       if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
+               amd_iommu_iotlb_sup = false;
+
        /* read extended feature bits */
        low  = readl(iommu->mmio_base + MMIO_EXT_FEATURES);
        high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4);