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x86/amd-iommu: Add flag to indicate IOTLB support

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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>
This commit is contained in:
Joerg Roedel 2011-04-05 12:50:24 +02:00
parent cb41ed85ef
commit 60f723b411
2 changed files with 6 additions and 0 deletions
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2
arch/x86/include/asm/amd_iommu_types.h
View File

@ -250,6 +250,8 @@ extern bool amd_iommu_dump;
/* global flag if IOMMUs cache non-present entries */ /* global flag if IOMMUs cache non-present entries */
extern bool amd_iommu_np_cache; 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 * Make iterating over all IOMMUs easier

4
arch/x86/kernel/amd_iommu_init.c
View File

@ -137,6 +137,7 @@ int amd_iommus_present;
/* IOMMUs have a non-present cache? */ /* IOMMUs have a non-present cache? */
bool amd_iommu_np_cache __read_mostly; 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 * 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)); MMIO_GET_LD(range));
iommu->evt_msi_num = MMIO_MSI_NUM(misc); 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)) if (!is_rd890_iommu(iommu->dev))
return; return;