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| author | Joerg Roedel <joerg.roedel@amd.com> | 2010-07-27 17:14:24 +0200 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2010-07-27 17:14:24 +0200 |
| commit | 80a506b8fdcfa868bb53eb740f928217d0966fc1 (patch) | |
| tree | 07efb59ecb6050712262387aa2fe3b952743fda5 /arch/x86/kernel/amd_iommu.c | |
| parent | x86/amd-iommu: Use for_each_pci_dev() (diff) | |
| download | linux-80a506b8fdcfa868bb53eb740f928217d0966fc1.tar.xz linux-80a506b8fdcfa868bb53eb740f928217d0966fc1.zip | |
x86/amd-iommu: Export cache-coherency capability
This patch exports the capability of the AMD IOMMU to force
cache coherency of DMA transactions through the IOMMU-API.
This is required to disable some nasty hacks in KVM when
this capability is not available.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | 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 29dd3b9f2f09..fa044e1e30a2 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -2572,6 +2572,11 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, static int amd_iommu_domain_has_cap(struct iommu_domain *domain, unsigned long cap) { + switch (cap) { + case IOMMU_CAP_CACHE_COHERENCY: + return 1; + } + return 0; } |