linux-kernel - [PATCH 1/1] iommu/vt-d: Drain PRQs when domain removed from RID

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Message-ID: <20241031095139.44220-1-baolu.lu@linux.intel.com>
Date: Thu, 31 Oct 2024 17:51:39 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: iommu@...ts.linux.dev
Cc: Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Joel Granados <joel.granados@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Kevin Tian <kevin.tian@...el.com>,
	Yi Liu <yi.l.liu@...el.com>,
	linux-kernel@...r.kernel.org,
	Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 1/1] iommu/vt-d: Drain PRQs when domain removed from RID

As this iommu driver now supports page faults for requests without
PASID, page requests should be drained when a domain is removed from
the RID2PASID entry.

This results in the intel_iommu_drain_pasid_prq() call being moved to
intel_pasid_tear_down_entry(). This indicates that when a translation
is removed from any PASID entry and the PRI has been enabled on the
device, page requests are flushed in the domain detachment path.

The intel_iommu_drain_pasid_prq() helper has been modified to support
sending device TLB invalidation requests for both PASID and non-PASID
cases.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c |  1 -
 drivers/iommu/intel/pasid.c |  1 +
 drivers/iommu/intel/prq.c   | 22 +++++++---------------
 3 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 87a3563dfe54..3878f35be09d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4069,7 +4069,6 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 	intel_iommu_debugfs_remove_dev_pasid(dev_pasid);
 	kfree(dev_pasid);
 	intel_pasid_tear_down_entry(iommu, dev, pasid, false);
-	intel_iommu_drain_pasid_prq(dev, pasid);
 }
 
 static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index 7e76062a7ad2..31665fb62e1c 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -265,6 +265,7 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
 		iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH);
 
 	devtlb_invalidation_with_pasid(iommu, dev, pasid);
+	intel_iommu_drain_pasid_prq(dev, pasid);
 }
 
 /*
diff --git a/drivers/iommu/intel/prq.c b/drivers/iommu/intel/prq.c
index 3c50c848893f..ae7f6f34462f 100644
--- a/drivers/iommu/intel/prq.c
+++ b/drivers/iommu/intel/prq.c
@@ -66,12 +66,8 @@ void intel_iommu_drain_pasid_prq(struct device *dev, u32 pasid)
 	struct pci_dev *pdev;
 	int head, tail;
 	u16 sid, did;
-	int qdep;
 
 	info = dev_iommu_priv_get(dev);
-	if (WARN_ON(!info || !dev_is_pci(dev)))
-		return;
-
 	if (!info->pri_enabled)
 		return;
 
@@ -81,8 +77,6 @@ void intel_iommu_drain_pasid_prq(struct device *dev, u32 pasid)
 	sid = PCI_DEVID(info->bus, info->devfn);
 	did = domain ? domain_id_iommu(domain, iommu) : FLPT_DEFAULT_DID;
 
-	qdep = pci_ats_queue_depth(pdev);
-
 	/*
 	 * Check and wait until all pending page requests in the queue are
 	 * handled by the prq handling thread.
@@ -114,15 +108,13 @@ void intel_iommu_drain_pasid_prq(struct device *dev, u32 pasid)
 	desc[0].qw0 = QI_IWD_STATUS_DATA(QI_DONE) |
 			QI_IWD_FENCE |
 			QI_IWD_TYPE;
-	desc[1].qw0 = QI_EIOTLB_PASID(pasid) |
-			QI_EIOTLB_DID(did) |
-			QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) |
-			QI_EIOTLB_TYPE;
-	desc[2].qw0 = QI_DEV_EIOTLB_PASID(pasid) |
-			QI_DEV_EIOTLB_SID(sid) |
-			QI_DEV_EIOTLB_QDEP(qdep) |
-			QI_DEIOTLB_TYPE |
-			QI_DEV_IOTLB_PFSID(info->pfsid);
+	qi_desc_piotlb(did, pasid, 0, -1, 0, &desc[1]);
+	if (pasid == IOMMU_NO_PASID)
+		qi_desc_dev_iotlb(sid, info->pfsid, info->ats_qdep, 0,
+				  MAX_AGAW_PFN_WIDTH, &desc[2]);
+	else
+		qi_desc_dev_iotlb_pasid(sid, info->pfsid, pasid, info->ats_qdep,
+					0, MAX_AGAW_PFN_WIDTH, &desc[2]);
 qi_retry:
 	reinit_completion(&iommu->prq_complete);
 	qi_submit_sync(iommu, desc, 3, QI_OPT_WAIT_DRAIN);
-- 
2.43.0