linux-kernel - [PATCH v13 15/15] iommu/smmuv3: Add PASID cache invalidation per PASID

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Message-Id: <20201118112151.25412-16-eric.auger@redhat.com>
Date:   Wed, 18 Nov 2020 12:21:51 +0100
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu, will@...nel.org,
        joro@...tes.org, maz@...nel.org, robin.murphy@....com,
        alex.williamson@...hat.com
Cc:     jean-philippe@...aro.org, zhangfei.gao@...aro.org,
        zhangfei.gao@...il.com, vivek.gautam@....com,
        shameerali.kolothum.thodi@...wei.com,
        jacob.jun.pan@...ux.intel.com, yi.l.liu@...el.com, tn@...ihalf.com,
        nicoleotsuka@...il.com, yuzenghui@...wei.com
Subject: [PATCH v13 15/15] iommu/smmuv3: Add PASID cache invalidation per PASID

In order to cascade guest CFGI_CD, let's add PASID cache invalidation
per PASID.

Signed-off-by: Eric Auger <eric.auger@...hat.com>

---

v12 -> v13:
- Fix !(info->flags & IOMMU_INV_PASID_FLAGS_PASID) check
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 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 ed64699a4a0d..45adfe4da11b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2999,9 +2999,19 @@ arm_smmu_cache_invalidate(struct iommu_domain *domain, struct device *dev,
 		} else {
 			return -EINVAL;
 		}
-	}
-	if (inv_info->cache & IOMMU_CACHE_INV_TYPE_PASID ||
-	    inv_info->cache & IOMMU_CACHE_INV_TYPE_DEV_IOTLB) {
+	} else if (inv_info->cache & IOMMU_CACHE_INV_TYPE_PASID) {
+		if (inv_info->granularity == IOMMU_INV_GRANU_PASID) {
+			struct iommu_inv_pasid_info *info =
+				&inv_info->granu.pasid_info;
+
+			if (!(info->flags & IOMMU_INV_PASID_FLAGS_PASID))
+				return -EINVAL;
+
+			arm_smmu_sync_cd(smmu_domain, info->pasid, true);
+		} else {
+			return -ENOENT;
+		}
+	} else { /* IOMMU_CACHE_INV_TYPE_DEV_IOTLB */
 		return -ENOENT;
 	}
 	return 0;
-- 
2.21.3