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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Subject: [PATCH 03/12] iommu/vt-d: Fix PASID devTLB invalidation
Date: Fri, 24 Jul 2020 09:49:16 +0800	[thread overview]
Message-ID: <20200724014925.15523-4-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20200724014925.15523-1-baolu.lu@linux.intel.com>

From: Jacob Pan <jacob.jun.pan@linux.intel.com>

DevTLB flush can be used for both DMA request with and without PASIDs.
The former uses PASID#0 (RID2PASID), latter uses non-zero PASID for SVA
usage.

This patch adds a check for PASID value such that devTLB flush with
PASID is used for SVA case. This is more efficient in that multiple
PASIDs can be used by a single device, when tearing down a PASID entry
we shall flush only the devTLB specific to a PASID.

Fixes: 6f7db75e1c46 ("iommu/vt-d: Add second level page table")
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/intel/pasid.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index c81f0f17c6ba..fa0154cce537 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -486,7 +486,16 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
 	qdep = info->ats_qdep;
 	pfsid = info->pfsid;
 
-	qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
+	/*
+	 * When PASID 0 is used, it indicates RID2PASID(DMA request w/o PASID),
+	 * devTLB flush w/o PASID should be used. For non-zero PASID under
+	 * SVA usage, device could do DMA with multiple PASIDs. It is more
+	 * efficient to flush devTLB specific to the PASID.
+	 */
+	if (pasid == PASID_RID2PASID)
+		qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
+	else
+		qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT);
 }
 
 void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev,
-- 
2.17.1

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  parent reply	other threads:[~2020-07-24  1:54 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24  1:49 [PATCH 00/12] [PULL REQUEST] iommu/vt-d: patches for v5.9 Lu Baolu
2020-07-24  1:49 ` [PATCH 01/12] iommu/vt-d: Enforce PASID devTLB field mask Lu Baolu
2020-07-24  1:49 ` [PATCH 02/12] iommu/vt-d: Remove global page support in devTLB flush Lu Baolu
2020-07-24  1:49 ` Lu Baolu [this message]
2020-07-24  1:49 ` [PATCH 04/12] iommu/vt-d: Handle non-page aligned address Lu Baolu
2020-07-24  1:49 ` [PATCH 05/12] iommu/vt-d: Fix devTLB flush for vSVA Lu Baolu
2020-07-24  1:49 ` [PATCH 06/12] iommu/vt-d: Warn on out-of-range invalidation address Lu Baolu
2020-07-24  1:49 ` [PATCH 07/12] iommu/vt-d: Disable multiple GPASID-dev bind Lu Baolu
2020-07-24  1:49 ` [PATCH 08/12] iommu/vt-d: Refactor device_to_iommu() helper Lu Baolu
2020-07-24  1:49 ` [PATCH 09/12] iommu/vt-d: Add a helper to get svm and sdev for pasid Lu Baolu
2020-07-24  1:49 ` [PATCH 10/12] iommu/vt-d: Report page request faults for guest SVA Lu Baolu
2020-07-24  1:49 ` [PATCH 11/12] iommu/vt-d: Add page response ops support Lu Baolu
2020-07-24  1:49 ` [PATCH 12/12] iommu/vt-d: Rename intel-pasid.h to pasid.h Lu Baolu
2020-07-24  8:55 ` [PATCH 00/12] [PULL REQUEST] iommu/vt-d: patches for v5.9 Joerg Roedel
2020-07-24  9:08   ` Lu Baolu

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