linux-kernel - [PATCH v3 0/6] iommu/amd: Enable page-selective flushes

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Date:   Mon,  7 Jun 2021 11:25:35 -0700
From:   Nadav Amit <nadav.amit@...il.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Nadav Amit <namit@...are.com>, Will Deacon <will@...nel.org>,
        Jiajun Cao <caojiajun@...are.com>,
        Robin Murphy <robin.murphy@....com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/6] iommu/amd: Enable page-selective flushes

From: Nadav Amit <namit@...are.com>

The previous patch, commit 268aa4548277 ("iommu/amd: Page-specific
invalidations for more than one page") was supposed to enable
page-selective IOTLB flushes on AMD.

Besides the bug that was already fixed by commit a017c567915f
("iommu/amd: Fix wrong parentheses on page-specific invalidations")
there are several remaining matters to enable and benefit from
page-selective IOTLB flushes on AMD:

1. Enable selective flushes on unmap (patch 1)
2. Avoid using flush-queue on vIOMMUs (patch 2)
3. Relaxed flushes when gathering, excluding vIOMMUs (patches 3-5)
4. Syncing once on scatter-gather map operations (patch 6)

Cc: Joerg Roedel <joro@...tes.org>
Cc: Will Deacon <will@...nel.org>
Cc: Jiajun Cao <caojiajun@...are.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: iommu@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org

--- 

v2->v3:
* Rebase on v5.13-rc5
* Refactoring (patches 4-5) [Robin]
* Rework flush logic (patch 5): more relaxed on native
* Syncing once on scatter-gather operations (patch 6)

v1->v2:
* Rebase on v5.13-rc3

Nadav Amit (5):
  iommu/amd: Selective flush on unmap
  iommu/amd: Do not use flush-queue when NpCache is on
  iommu: Factor iommu_iotlb_gather_is_disjoint() out
  iommu/amd: Tailored gather logic for AMD
  iommu/amd: Sync once for scatter-gather operations

Robin Murphy (1):
  iommu: Improve iommu_iotlb_gather helpers

 drivers/iommu/amd/init.c  |  7 +++-
 drivers/iommu/amd/iommu.c | 72 ++++++++++++++++++++++++++++++---
 drivers/iommu/mtk_iommu.c |  5 +--
 include/linux/iommu.h     | 84 +++++++++++++++++++++++++++++++++------
 4 files changed, 145 insertions(+), 23 deletions(-)

-- 
2.25.1