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From: Liu Yi L <yi.l.liu@intel.com>
To: baolu.lu@linux.intel.com, jacob.jun.pan@intel.com,
	xin.zeng@intel.com, Kaijie.Guo@intel.com, will@kernel.org,
	joro@8bytes.org
Cc: kevin.tian@intel.com, ashok.raj@intel.com, jun.j.tian@intel.com,
	iommu@lists.linux-foundation.org,
	David Woodhouse <dwmw2@infradead.org>
Subject: [PATCH 1/3] iommu/vt-d: Move intel_iommu info from struct intel_svm to struct intel_svm_dev
Date: Sun, 20 Dec 2020 08:03:50 +0800
Message-ID: <20201220000352.183523-2-yi.l.liu@intel.com> (raw)
In-Reply-To: <20201220000352.183523-1-yi.l.liu@intel.com>

Current struct intel_svm has a field to record the struct intel_iommu
pointer for a PASID bind. And struct intel_svm will be shared by all
the devices bind to the same process. The devices may be behind different
DMAR units. As the iommu driver code uses the intel_iommu pointer stored
in intel_svm struct to do cache invalidations, it may only flush the cache
on a single DMAR unit, for others, the cache invalidation is missed.

As intel_svm struct already has a device list, this patch just moves the
intel_iommu pointer to be a field of intel_svm_dev struct.

Fixes: 2f26e0a9c986 ("iommu/vt-d: Add basic SVM PASID support")
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Raj Ashok <ashok.raj@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Reported-by: Guo Kaijie <Kaijie.Guo@intel.com>
Reported-by: Xin Zeng <xin.zeng@intel.com>
Signed-off-by: Guo Kaijie <Kaijie.Guo@intel.com>
Signed-off-by: Xin Zeng <xin.zeng@intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
 drivers/iommu/intel/svm.c   | 9 +++++----
 include/linux/intel-iommu.h | 2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 3242ebd0bca3..4a10c9ff368c 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -142,7 +142,7 @@ static void intel_flush_svm_range_dev (struct intel_svm *svm, struct intel_svm_d
 	}
 	desc.qw2 = 0;
 	desc.qw3 = 0;
-	qi_submit_sync(svm->iommu, &desc, 1, 0);
+	qi_submit_sync(sdev->iommu, &desc, 1, 0);
 
 	if (sdev->dev_iotlb) {
 		desc.qw0 = QI_DEV_EIOTLB_PASID(svm->pasid) |
@@ -166,7 +166,7 @@ static void intel_flush_svm_range_dev (struct intel_svm *svm, struct intel_svm_d
 		}
 		desc.qw2 = 0;
 		desc.qw3 = 0;
-		qi_submit_sync(svm->iommu, &desc, 1, 0);
+		qi_submit_sync(sdev->iommu, &desc, 1, 0);
 	}
 }
 
@@ -211,7 +211,7 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 	 */
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdev, &svm->devs, list)
-		intel_pasid_tear_down_entry(svm->iommu, sdev->dev,
+		intel_pasid_tear_down_entry(sdev->iommu, sdev->dev,
 					    svm->pasid, true);
 	rcu_read_unlock();
 
@@ -363,6 +363,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
 	}
 	sdev->dev = dev;
 	sdev->sid = PCI_DEVID(info->bus, info->devfn);
+	sdev->iommu = iommu;
 
 	/* Only count users if device has aux domains */
 	if (iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX))
@@ -546,6 +547,7 @@ intel_svm_bind_mm(struct device *dev, unsigned int flags,
 		goto out;
 	}
 	sdev->dev = dev;
+	sdev->iommu = iommu;
 
 	ret = intel_iommu_enable_pasid(iommu, dev);
 	if (ret) {
@@ -575,7 +577,6 @@ intel_svm_bind_mm(struct device *dev, unsigned int flags,
 			kfree(sdev);
 			goto out;
 		}
-		svm->iommu = iommu;
 
 		if (pasid_max > intel_pasid_max_id)
 			pasid_max = intel_pasid_max_id;
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index d956987ed032..94522685a0d9 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -758,6 +758,7 @@ struct intel_svm_dev {
 	struct list_head list;
 	struct rcu_head rcu;
 	struct device *dev;
+	struct intel_iommu *iommu;
 	struct svm_dev_ops *ops;
 	struct iommu_sva sva;
 	u32 pasid;
@@ -771,7 +772,6 @@ struct intel_svm {
 	struct mmu_notifier notifier;
 	struct mm_struct *mm;
 
-	struct intel_iommu *iommu;
 	unsigned int flags;
 	u32 pasid;
 	int gpasid; /* In case that guest PASID is different from host PASID */
-- 
2.25.1

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  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-20  0:03 [PATCH 0/4] iommu/vtd-: Misc fixes on scalable mode Liu Yi L
2020-12-20  0:03 ` Liu Yi L [this message]
2020-12-19  6:50   ` [PATCH 1/3] iommu/vt-d: Move intel_iommu info from struct intel_svm to struct intel_svm_dev Lu Baolu
2020-12-21  1:43     ` Guo, Kaijie
2020-12-20  0:03 ` [PATCH 2/3] iommu/vt-d: Track device aux-attach with subdevice_domain_info Liu Yi L
2020-12-19  6:52   ` Lu Baolu
2020-12-22 20:21   ` Jacob Pan
2020-12-23  3:59     ` Liu, Yi L
2020-12-20  0:03 ` [PATCH 3/3] iommu/vt-d: A fix to iommu_flush_dev_iotlb() for aux-domain Liu Yi L
2020-12-19  6:52   ` Lu Baolu
2020-12-22 18:17 ` [PATCH 0/4] iommu/vtd-: Misc fixes on scalable mode Jacob Pan
2020-12-23  3:57   ` Liu, Yi L

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