Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com> --- drivers/iommu/intel-pasid.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c index 22b30f10b396..191508c7c03e 100644 --- a/drivers/iommu/intel-pasid.c +++ b/drivers/iommu/intel-pasid.c @@ -500,6 +500,28 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu, } /* + * Skip top levels of page tables for iommu which has less agaw + * than default. Unnecessary for PT mode. + */ +static inline int iommu_skip_agaw(struct dmar_domain *domain, + struct intel_iommu *iommu, + struct dma_pte **pgd) +{ + int agaw; + + for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) { + *pgd = phys_to_virt(dma_pte_addr(*pgd)); + if (!dma_pte_present(*pgd)) { + return -EINVAL; + } + } + pr_debug_ratelimited("%s: pgd: %llx, agaw %d d_agaw %d\n", __func__, (u64)*pgd, + iommu->agaw, domain->agaw); + + return agaw; +} + +/* * Set up the scalable mode pasid entry for second only translation type. */ int intel_pasid_setup_second_level(struct intel_iommu *iommu, -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu