linux-kernel - [PATCH V10 04/11] iommu/vt-d: Use helper function to skip agaw for SL

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Date:   Fri, 20 Mar 2020 16:27:34 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Lu Baolu" <baolu.lu@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     "Yi Liu" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH V10 04/11] iommu/vt-d: Use helper function to skip agaw for SL

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel-pasid.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index 191508c7c03e..9bdb7ee228b6 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -544,17 +544,11 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
 		return -EINVAL;
 	}
 
-	/*
-	 * Skip top levels of page tables for iommu which has less agaw
-	 * than default. Unnecessary for PT mode.
-	 */
 	pgd = domain->pgd;
-	for (agaw = domain->agaw; agaw > iommu->agaw; agaw--) {
-		pgd = phys_to_virt(dma_pte_addr(pgd));
-		if (!dma_pte_present(pgd)) {
-			dev_err(dev, "Invalid domain page table\n");
-			return -EINVAL;
-		}
+	agaw = iommu_skip_agaw(domain, iommu, &pgd);
+	if (agaw < 0) {
+		dev_err(dev, "Invalid domain page table\n");
+		return -EINVAL;
 	}
 
 	pgd_val = virt_to_phys(pgd);
-- 
2.7.4