linux-kernel - [RFC PATCH v2 0/9] Install domain onto multiple smmus

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Message-ID: <20230822105738.1607365-1-mshavit@google.com>
Date:   Tue, 22 Aug 2023 18:56:56 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     nicolinc@...dia.com, tina.zhang@...el.com,
        jean-philippe@...aro.org, will@...nel.org, robin.murphy@....com,
        jgg@...dia.com, Michael Shavit <mshavit@...gle.com>,
        Dawei Li <set_pte_at@...look.com>,
        Jason Gunthorpe <jgg@...pe.ca>, Joerg Roedel <joro@...tes.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>
Subject: [RFC PATCH v2 0/9] Install domain onto multiple smmus


Hi all,

This series refactors the arm-smmu-v3 driver to support attaching
domains onto masters belonging to different smmu devices.

The main objective of this series is allow further refactorings of
arm-smmu-v3-sva. Specifically, we'd like to reach the state where:
1. A single SVA domain is allocated per MM/ASID
2. arm-smmu-v3-sva's set_dev_pasid implementation directly attaches that
   SVA domain to different masters, regardless of whether those masters
   belong to different smmus.

If armm-smmu-v3-sva is handed iommu_domains that have a 1:1 relationship
with an MM struct, then it won't have to share a CD with multiple
domains (or arm_smmu_mmu_notifiers). But to get there, the arm-smmu-v3
driver must first support domains installed on multiple SMMU devices.

This series depends on the CD table ownership refactor: https://lore.kernel.org/all/20230816131925.2521220-1-mshavit@google.com/
as well as the VMID IDA patch: https://lore.kernel.org/all/169087904450.1290857.11726985177314533259.b4-ty@kernel.org/#r

Thanks,
Michael Shavit

Changes in v2:
- Moved the ARM_SMMU_FEAT_BTM changes into a new prepatory commit
- Access the pgtbl_cfg from the pgtable_ops instead of storing a copy in
  the arm_smmu_domain.
- Remove arm_smmu_installed_smmu structure, instead grouping masters
  attached to the same SMMU together in the smmu_domain->devices list.
- Add a parameter to arm_smmu_tlb_inv_range_asid to make skipping of BTM
  capable devices explicit.
- Moved VMID allocator to a global allocator instead of per-SMMU
- Link to v1: https://lore.kernel.org/all/20230817182055.1770180-1-mshavit@google.com/

Michael Shavit (9):
  iommu/arm-smmu-v3: group attached devices by smmu
  iommu/arm-smmu-v3-sva: Move SVA optimization into
    arm_smmu_tlb_inv_range_asid
  iommu/arm-smmu-v3: Issue invalidations commands to multiple SMMUs
  iommu/arm-smmu-v3-sva: Allocate new ASID from installed_smmus
  iommu/arm-smmu-v3: Alloc vmid from global pool
  iommu/arm-smmu-v3: check smmu compatibility on attach
  iommu/arm-smmu-v3: Add arm_smmu_device as a parameter to
    domain_finalise
  iommu/arm-smmu-v3: check for domain initialization using pgtbl_ops
  iommu/arm-smmu-v3: allow multi-SMMU domain installs.

 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  34 ++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 277 +++++++++++++-----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |   7 +-
 3 files changed, 237 insertions(+), 81 deletions(-)


base-commit: 6eaae198076080886b9e7d57f4ae06fa782f90ef
prerequisite-patch-id: f701e5ac2cce085366342edff287a35d1cb82b9c
prerequisite-patch-id: c8d21ff19c2c1dd18799a6b83f483add654d187e
prerequisite-patch-id: 6ebba95cb12a723645843b4bd1bc45c94779d853
prerequisite-patch-id: 3f767e1c37d2996323c4f6d2a2d1912ab75281f7
prerequisite-patch-id: 5a4109fa3e22e2399ad064951c2ca1aeba4a68f7
prerequisite-patch-id: c4b3bd34b8be7afebd3e44bc4ec218d74753ce77
prerequisite-patch-id: 6d89e53518d25ac983ac99786950ee1a558c271f
prerequisite-patch-id: 447219e565cadc34b03db05dad58d8e5c4b5a382
prerequisite-patch-id: 63adb2c3f97d4948d96a0d5960184f5ac814d7f7
prerequisite-patch-id: e71195fcf1aa56d8ef9d7403b9e4492c17b8fb84
prerequisite-patch-id: ba82add44850bf8fb271292020edb746aef93a65
-- 
2.42.0.rc1.204.g551eb34607-goog