linux-kernel - Re: [PATCH v6 17/25] iommufd: Allow an input data_type via iommu_hw

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Message-ID: <78d05dff-f396-4214-a7fc-f0c674144aef@linux.intel.com>
Date: Mon, 16 Jun 2025 19:54:26 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Nicolin Chen <nicolinc@...dia.com>, jgg@...dia.com, kevin.tian@...el.com,
 corbet@....net, will@...nel.org
Cc: baolu.lu@...ux.intel.com, 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
Subject: Re: [PATCH v6 17/25] iommufd: Allow an input data_type via
 iommu_hw_info

On 6/14/2025 3:14 PM, Nicolin Chen wrote:
> The iommu_hw_info can output via the out_data_type field the vendor data
> type from a driver, but this only allows driver to report one data type.
> 
> Now, with SMMUv3 having a Tegra241 CMDQV implementation, it has two sets
> of types and data structs to report.
> 
> One way to support that is to use the same type field bidirectionally.
> 
> Reuse the same field by adding an "in_data_type", allowing user space to
> request for a specific type and to get the corresponding data.
> 
> For backward compatibility, since the ioctl handler has never checked an
> input value, add an IOMMU_HW_INFO_FLAG_INPUT_TYPE to switch between the
> old output-only field and the new bidirectional field.
> 
> Reviewed-by: Kevin Tian<kevin.tian@...el.com>
> Signed-off-by: Nicolin Chen<nicolinc@...dia.com>

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>