linux-kernel - [PATCH 0/5] iommu: Some IOVA code reorganisation

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Date:   Fri, 24 Sep 2021 18:01:52 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <mst@...hat.com>,
        <jasowang@...hat.com>, <robin.murphy@....com>
CC:     <xieyongji@...edance.com>, <linux-kernel@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>,
        <virtualization@...ts.linux-foundation.org>, <linuxarm@...wei.com>,
        <thunder.leizhen@...wei.com>, <baolu.lu@...ux.intel.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH 0/5] iommu: Some IOVA code reorganisation

The IOVA domain structure is a bit overloaded, holding:
- IOVA tree management
- FQ control
- IOVA rcache memories

Indeed only a couple of IOVA users use the rcache, and only dma-iommu.c
uses the FQ feature.

This series separates out that structure. In addition, it moves the FQ
code into dma-iommu.c . This is not strictly necessary, but it does make
it easier for the FQ domain lookup the rcache domain.

The rcache code stays where it is, as it may be reworked in future, so
there is not much point in relocating and then discarding.

This topic was initially discussed and suggested (I think) by Robin here:
https://lore.kernel.org/linux-iommu/1d06eda1-9961-d023-f5e7-fe87e768f067@arm.com/

I also added in another old patch to avoid double-negatives now that
the error handling is a bit better for IOVA init code:
https://lore.kernel.org/linux-iommu/YAVeDOiKBEKZ2Tdq@myrica/

Baseline is v5.15-rc2

John Garry (5):
  iova: Move fast alloc size roundup into alloc_iova_fast()
  iommu: Separate flush queue memories from IOVA domain structure
  iommu: Move IOVA flush queue code to dma-iommu
  iommu: Separate IOVA rcache memories from iova_domain structure
  iommu/iova: Avoid double-negatives in magazine helpers

 drivers/iommu/dma-iommu.c            | 341 +++++++++++++++++++++++---
 drivers/iommu/iova.c                 | 343 ++++++++-------------------
 drivers/vdpa/vdpa_user/iova_domain.c |  61 ++---
 drivers/vdpa/vdpa_user/iova_domain.h |   4 +-
 include/linux/iova.h                 |  82 +------
 5 files changed, 451 insertions(+), 380 deletions(-)

-- 
2.26.2