From 52815b75682e25db45545911fd2b09ef5856e695 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 17 Nov 2011 17:24:28 +0100 Subject: 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 --- drivers/iommu/amd_iommu_init.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/iommu/amd_iommu_init.c') 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) && -- cgit v1.2.1