diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index bf3e450b5b97..39b90621a1a1 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -443,6 +443,20 @@ static LIST_HEAD(device_domain_list); static const struct iommu_ops intel_iommu_ops; +static bool translation_pre_enabled(struct intel_iommu *iommu) +{ + return (iommu->flags & VTD_FLAG_TRANS_PRE_ENABLED); +} + +static void init_translation_status(struct intel_iommu *iommu) +{ + u32 gsts; + + gsts = readl(iommu->reg + DMAR_GSTS_REG); + if (gsts & DMA_GSTS_TES) + iommu->flags |= VTD_FLAG_TRANS_PRE_ENABLED; +} + /* Convert generic 'struct iommu_domain to private struct dmar_domain */ static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom) { @@ -2809,6 +2823,11 @@ static int __init init_dmars(void) if (ret) goto free_iommu; + init_translation_status(iommu); + + if (translation_pre_enabled(iommu)) + pr_info("Translation already enabled - trying to copy translation structures\n"); + /* * TBD: * we could share the same root & context tables |