linux-kernel - [PATCH 5/5] iommu/vt-d: Consolidate pasid-based device tlb invalidation

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Date:   Fri, 22 Nov 2019 11:04:49 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     David Woodhouse <dwmw2@...radead.org>, ashok.raj@...el.com,
        jacob.jun.pan@...ux.intel.com, kevin.tian@...el.com,
        Eric Auger <eric.auger@...hat.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 5/5] iommu/vt-d: Consolidate pasid-based device tlb invalidation

Merge pasid-based device tlb invalidation into iommu->flush.p_dev_tlb_inv.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c | 41 +++++++++++++++++++++++++++++++++++++
 drivers/iommu/intel-svm.c   | 33 ++++++-----------------------
 2 files changed, 47 insertions(+), 27 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index fec78cc877c1..dd16d466320f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3074,6 +3074,46 @@ qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid, u64 addr,
 	qi_submit_sync(&desc, iommu);
 }
 
+/* PASID-based device TLB invalidation */
+static void
+qi_flush_dev_piotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
+		    u32 pasid, u16 qdep, u64 address, unsigned long npages)
+{
+	struct qi_desc desc = {.qw2 = 0, .qw3 = 0};
+
+	desc.qw0 = QI_DEV_EIOTLB_PASID(pasid) | QI_DEV_EIOTLB_SID(sid) |
+			QI_DEV_EIOTLB_QDEP(qdep) | QI_DEIOTLB_TYPE |
+			QI_DEV_IOTLB_PFSID(pfsid);
+
+	/*
+	 * npages == -1 means a PASID-selective invalidation, otherwise,
+	 * a positive value for Page-selective-within-PASID invalidation.
+	 * 0 is not a valid input.
+	 */
+	if (WARN_ON(!npages)) {
+		pr_err("Invalid input npages = %ld\n", npages);
+		return;
+	}
+
+	if (npages == -1) {
+		desc.qw1 = QI_DEV_EIOTLB_ADDR(((u64)-1) >> 1) |
+				QI_DEV_EIOTLB_SIZE;
+	} else if (npages > 1) {
+		/* The least significant zero bit indicates the size. So,
+		 * for example, an "address" value of 0x12345f000 will
+		 * flush from 0x123440000 to 0x12347ffff (256KiB). */
+		unsigned long last = address + ((unsigned long)(npages - 1) << VTD_PAGE_SHIFT);
+		unsigned long mask = __rounddown_pow_of_two(address ^ last);
+
+		desc.qw1 = QI_DEV_EIOTLB_ADDR((address & ~mask) |
+				(mask - 1)) | QI_DEV_EIOTLB_SIZE;
+	} else {
+		desc.qw1 = QI_DEV_EIOTLB_ADDR(address);
+	}
+
+	qi_submit_sync(&desc, iommu);
+}
+
 static void intel_iommu_init_qi(struct intel_iommu *iommu)
 {
 	/*
@@ -3108,6 +3148,7 @@ static void intel_iommu_init_qi(struct intel_iommu *iommu)
 		iommu->flush.pc_inv = qi_flush_pasid;
 		iommu->flush.dev_tlb_inv = qi_flush_dev_iotlb;
 		iommu->flush.p_iotlb_inv = qi_flush_piotlb;
+		iommu->flush.p_dev_tlb_inv = qi_flush_dev_piotlb;
 		pr_info("%s: Using Queued invalidation\n", iommu->name);
 	}
 }
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 02c6b14f0568..b6b22989eb46 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -114,39 +114,18 @@ void intel_svm_check(struct intel_iommu *iommu)
 	iommu->flags |= VTD_FLAG_SVM_CAPABLE;
 }
 
-static void intel_flush_svm_range_dev (struct intel_svm *svm, struct intel_svm_dev *sdev,
-				unsigned long address, unsigned long pages, int ih)
+static void
+intel_flush_svm_range_dev(struct intel_svm *svm, struct intel_svm_dev *sdev,
+			  unsigned long address, unsigned long pages, int ih)
 {
-	struct qi_desc desc;
 	struct intel_iommu *iommu = svm->iommu;
 
 	iommu->flush.p_iotlb_inv(iommu, sdev->did,
 				 svm->pasid, address, pages, ih);
 
-	if (sdev->dev_iotlb) {
-		desc.qw0 = QI_DEV_EIOTLB_PASID(svm->pasid) |
-				QI_DEV_EIOTLB_SID(sdev->sid) |
-				QI_DEV_EIOTLB_QDEP(sdev->qdep) |
-				QI_DEIOTLB_TYPE;
-		if (pages == -1) {
-			desc.qw1 = QI_DEV_EIOTLB_ADDR(-1ULL >> 1) |
-					QI_DEV_EIOTLB_SIZE;
-		} else if (pages > 1) {
-			/* The least significant zero bit indicates the size. So,
-			 * for example, an "address" value of 0x12345f000 will
-			 * flush from 0x123440000 to 0x12347ffff (256KiB). */
-			unsigned long last = address + ((unsigned long)(pages - 1) << VTD_PAGE_SHIFT);
-			unsigned long mask = __rounddown_pow_of_two(address ^ last);
-
-			desc.qw1 = QI_DEV_EIOTLB_ADDR((address & ~mask) |
-					(mask - 1)) | QI_DEV_EIOTLB_SIZE;
-		} else {
-			desc.qw1 = QI_DEV_EIOTLB_ADDR(address);
-		}
-		desc.qw2 = 0;
-		desc.qw3 = 0;
-		qi_submit_sync(&desc, svm->iommu);
-	}
+	if (sdev->dev_iotlb)
+		iommu->flush.p_dev_tlb_inv(iommu, sdev->sid, 0, svm->pasid,
+					   sdev->qdep, address, pages);
 }
 
 static void intel_flush_svm_range(struct intel_svm *svm, unsigned long address,
-- 
2.17.1