linux-kernel - [PATCH v3 0/2] iommu/arm-smmu-v3: Two vsmmu impl

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Message-ID: <20250721200444.1740461-1-nicolinc@nvidia.com>
Date: Mon, 21 Jul 2025 13:04:42 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <will@...nel.org>
CC: <joro@...tes.org>, <robin.murphy@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
Subject: [PATCH v3 0/2] iommu/arm-smmu-v3: Two vsmmu impl_ops cleanups

Since the vsmmu and cmdqv patches were accepeted via the iommufd tree,
this is based on Jason's for-next tree.

Per request from Will following the accepted latest vcmdq series to clean
up the impl_ops:

https://lore.kernel.org/linux-iommu/aHE4Y-fbucm-j-yi@willie-the-truck/
"
 It would be nice to avoid adding data members to the ops structure, if
 at all possible. The easiest thing would probably be to add a function
 for getting the vsmmu size and then pushing the two checks against
 'vsmmu_type' down into the impl_ops callbacks so that: 

   1. If the type is IOMMU_VIOMMU_TYPE_ARM_SMMUV3, we don't bother with
      the impl_ops at all in arm_vsmmu_init() and arm_smmu_get_viommu_size()

   2. Otherwise, we pass the type into the impl_ops and they can check it

 Of course, that can be a patch on top of the series as there's no point
 respinning the whole just for this.
"

Add two clean up patches with the first one doing 1 and 2 to prioritize
IOMMU_VIOMMU_TYPE_ARM_SMMUV3 always, and the second one dropping static
vsmmu_type and vsmmu_size data members.

Changelog
v3:
 * Add Acked-by from Will
 * Use logical "!=" instead of arithmetic "^"
v2:
 https://lore.kernel.org/all/20250721191236.1739951-1-nicolinc@nvidia.com/
 * Add Acked-by from Will
 * Move get_viommu_size and vsmmu_init validation to arm_smmu_impl_probe()
v1:
 https://lore.kernel.org/all/20250718234822.1734190-1-nicolinc@nvidia.com/

Nicolin Chen (2):
  iommu/arm-smmu-v3: Do not bother impl_ops if
    IOMMU_VIOMMU_TYPE_ARM_SMMUV3
  iommu/arm-smmu-v3: Replace vsmmu_size/type with get_viommu_size

 .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c     | 20 +++++++++----------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 14 +++++++++++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  3 +--
 .../iommu/arm/arm-smmu-v3/tegra241-cmdqv.c    | 14 +++++++++++--
 4 files changed, 36 insertions(+), 15 deletions(-)

base-commit: ab6bc44159d8f0c4ee757e0ce041fa9033e0ead8
-- 
2.43.0