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| author | Joerg Roedel <joerg.roedel@amd.com> | 2011-11-17 17:24:28 +0100 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-12-12 15:18:57 +0100 |
| commit | 52815b75682e25db45545911fd2b09ef5856e695 (patch) | |
| tree | a54d7812e6d68d0663e6929f29dadf0ce5f74c59 /drivers/iommu/amd_iommu_init.c | |
| parent | 132bd68f180dd5de9176e20532910503f6393f14 (diff) | |
| download | lwn-52815b75682e25db45545911fd2b09ef5856e695.tar.gz lwn-52815b75682e25db45545911fd2b09ef5856e695.zip | |
iommu/amd: Add support for IOMMUv2 domain mode
This patch adds support for protection domains that
implement two-level paging for devices.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 7c3fd572a23b..c7a5d7e14547 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -755,6 +755,7 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu) iommu->features = ((u64)high << 32) | low; if (iommu_feature(iommu, FEATURE_GT)) { + int glxval; u32 pasids; u64 shift; @@ -763,6 +764,14 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu) pasids = (1 << shift); amd_iommu_max_pasids = min(amd_iommu_max_pasids, pasids); + + glxval = iommu->features & FEATURE_GLXVAL_MASK; + glxval >>= FEATURE_GLXVAL_SHIFT; + + if (amd_iommu_max_glx_val == -1) + amd_iommu_max_glx_val = glxval; + else + amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval); } if (iommu_feature(iommu, FEATURE_GT) && |