linux-kernel - Re: [PATCH v5 20/29] iommu: Allow an input type in hw

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Message-ID: <20250530165230.GH233377@nvidia.com>
Date: Fri, 30 May 2025 13:52:30 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, will@...nel.org,
	bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
	peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
	praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com
Subject: Re: [PATCH v5 20/29] iommu: Allow an input type in hw_info op

On Sat, May 17, 2025 at 08:21:37PM -0700, Nicolin Chen wrote:
> The hw_info uAPI will support a bidirectional data_type field that can be
> used as an input field for user space to request for a specific info data.
> 
> To prepare for the uAPI update, change the iommu layer first:
>  - Add a new IOMMU_HW_INFO_TYPE_DEFAULT as an input, for which driver can
>    output its only (or firstly) supported type
>  - Update the kdoc accordingly
>  - Roll out the type validation in the existing drivers
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  include/linux/iommu.h                               | 6 ++++--
>  include/uapi/linux/iommufd.h                        | 4 +++-
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 4 ++++
>  drivers/iommu/intel/iommu.c                         | 4 ++++
>  drivers/iommu/iommufd/device.c                      | 3 +++
>  drivers/iommu/iommufd/selftest.c                    | 4 ++++
>  6 files changed, 22 insertions(+), 3 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason