linux-kernel - [PATCH 2/2] iommu: arm-smmu-v3: Report domain nesting info reuqired for stage1

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Date:   Fri, 12 Feb 2021 16:28:59 +0530
From:   Vivek Gautam <vivek.gautam@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        virtualization@...ts.linux-foundation.org
Cc:     joro@...tes.org, will.deacon@....com, mst@...hat.com,
        robin.murphy@....com, jean-philippe@...aro.org,
        eric.auger@...hat.com, alex.williamson@...hat.com,
        kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, Lorenzo.Pieralisi@....com,
        shameerali.kolothum.thodi@...wei.com
Subject: [PATCH 2/2] iommu: arm-smmu-v3: Report domain nesting info reuqired for stage1

Update nested domain information required for stage1 page table.

Signed-off-by: Vivek Gautam <vivek.gautam@....com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index c11dd3940583..728018921fae 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2555,6 +2555,7 @@ static int arm_smmu_domain_nesting_info(struct arm_smmu_domain *smmu_domain,
 					void *data)
 {
 	struct iommu_nesting_info *info = (struct iommu_nesting_info *)data;
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
 	unsigned int size;
 
 	if (!info || smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
@@ -2571,9 +2572,20 @@ static int arm_smmu_domain_nesting_info(struct arm_smmu_domain *smmu_domain,
 		return 0;
 	}
 
-	/* report an empty iommu_nesting_info for now */
-	memset(info, 0x0, size);
+	/* Update the nesting info as required for stage1 page tables */
+	info->addr_width = smmu->ias;
+	info->format = IOMMU_PASID_FORMAT_ARM_SMMU_V3;
+	info->features = IOMMU_NESTING_FEAT_BIND_PGTBL |
+			 IOMMU_NESTING_FEAT_PAGE_RESP |
+			 IOMMU_NESTING_FEAT_CACHE_INVLD;
+	info->pasid_bits = smmu->ssid_bits;
+	info->vendor.smmuv3.asid_bits = smmu->asid_bits;
+	info->vendor.smmuv3.pgtbl_fmt = ARM_64_LPAE_S1;
+	memset(&info->padding, 0x0, 12);
+	memset(&info->vendor.smmuv3.padding, 0x0, 9);
+
 	info->argsz = size;
+
 	return 0;
 }
 
-- 
2.17.1