linux-kernel - [PATCH v1 0/7] Refactor the SMMU's CD table ownership

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Message-ID: <20230727182647.4106140-1-mshavit@google.com>
Date:   Fri, 28 Jul 2023 02:26:16 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     Michael Shavit <mshavit@...gle.com>, jean-philippe@...aro.org,
        nicolinc@...dia.com, jgg@...dia.com, baolu.lu@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/7] Refactor the SMMU's CD table ownership

Hi all,

This series refactors stage 1 domains so that they describe a single CD
entry. These entries are now inserted into a CD table that is owned by
the arm_smmu_master instead of the domain.
This is conceptually cleaner and unblocks other features, such as
attaching domains with PASID (for unmanaged/dma domains).

This patch series was originally part of a larger patch series that
implemented the set_dev_pasid callback for non-SVA domains but is now
split into a distinct series.

This patch series is also available on gerrit with Jean's SMMU test
engine patches cherry-picked on top for testing:
https://linux-review.git.corp.google.com/c/linux/kernel/git/torvalds/linux/+/24729

Thanks,
Michael Shavit

Changelog
v1:
* Replace s1_cfg with arm_smmu_ctx_desc_cfg representing the CD table
* Assume that the CD table is owned by the SMMU master for most
  operations. This is forward-compatible with the nested patch series as
  these operations wouldn't be called when the installed CD table comes
  from nested domains.
* Split off as a distinct patch series Split-off from:
https://lore.kernel.org/all/20230621063825.268890-1-mshavit@google.com/

Michael Shavit (7):
  iommu/arm-smmu-v3: Move ctx_desc out of s1_cfg
  iommu/arm-smmu-v3: Replace s1_cfg with ctx_desc_cfg
  iommu/arm-smmu-v3: Encapsulate ctx_desc_cfg init in alloc_cd_tables
  iommu/arm-smmu-v3: move stall_enabled to the cd table
  iommu/arm-smmu-v3: Skip cd sync if CD table isn't active
  iommu/arm-smmu-v3: Refactor write_ctx_desc
  iommu/arm-smmu-v3: Move CD table to arm_smmu_master

 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  35 +++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 167 ++++++++----------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  39 ++--
 3 files changed, 123 insertions(+), 118 deletions(-)

base-commit: 0a8db05b571ad5b8d5c8774a004c0424260a90bd
-- 
2.41.0.585.gd2178a4bd4-goog