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| author |   Joerg Roedel <joerg.roedel@amd.com> | 2011-04-05 12:50:24 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-04-11 09:04:03 +0200 |
| commit | 60f723b4117507c05c8b0b5c8b98ecc12a76878e (patch) | |
| tree | fb176152997ad9e92ba5e50b27e9bb7e53767b63 | |
| parent | x86/amd-iommu: Flush device IOTLB if ATS is enabled (diff) | |
| download | linux-dev-60f723b4117507c05c8b0b5c8b98ecc12a76878e.tar.xz linux-dev-60f723b4117507c05c8b0b5c8b98ecc12a76878e.zip | |
x86/amd-iommu: Add flag to indicate IOTLB support
This patch adds a flag to the AMD IOMMU driver to indicate
that all IOMMUs present in the system support device IOTLBs.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/include/asm/amd_iommu_types.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 4 |
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h index f5d184e7d5be..cb811c965548 100644 --- a/arch/x86/include/asm/amd_iommu_types.h +++ b/arch/x86/include/asm/amd_iommu_types.h @@ -250,6 +250,8 @@ extern bool amd_iommu_dump; /* global flag if IOMMUs cache non-present entries */ extern bool amd_iommu_np_cache; +/* Only true if all IOMMUs support device IOTLBs */ +extern bool amd_iommu_iotlb_sup; /* * Make iterating over all IOMMUs easier diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index 8848dda808e2..b6c634f3dc07 100644 --- 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 @@ -673,6 +674,9 @@ 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; + if (!is_rd890_iommu(iommu->dev)) return; |