linux-kernel - Re: [RFC PATCH v2 06/10] iommu/riscv: support nested iommu for getting iommu hardware information

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Date: Wed, 19 Jun 2024 12:49:01 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Zong Li <zong.li@...ive.com>
Cc: joro@...tes.org, will@...nel.org, robin.murphy@....com,
	tjeznach@...osinc.com, paul.walmsley@...ive.com, palmer@...belt.com,
	aou@...s.berkeley.edu, kevin.tian@...el.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-riscv@...ts.infradead.org
Subject: Re: [RFC PATCH v2 06/10] iommu/riscv: support nested iommu for
 getting iommu hardware information

On Fri, Jun 14, 2024 at 10:21:52PM +0800, Zong Li wrote:
> This patch implements .hw_info operation and the related data
> structures for passing the IOMMU hardware capabilities for iommufd.
> 
> Signed-off-by: Zong Li <zong.li@...ive.com>
> ---
>  drivers/iommu/riscv/iommu.c  | 20 ++++++++++++++++++++
>  include/uapi/linux/iommufd.h | 18 ++++++++++++++++++
>  2 files changed, 38 insertions(+)

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

>  /**
>   * enum iommu_hw_info_type - IOMMU Hardware Info Types
>   * @IOMMU_HW_INFO_TYPE_NONE: Used by the drivers that do not report hardware
>   *                           info
>   * @IOMMU_HW_INFO_TYPE_INTEL_VTD: Intel VT-d iommu info type
> + * @IOMMU_HW_INFO_TYPE_RISCV_IOMMU: RISC-V iommu info type
>   */

Is there a more formal name than "RISCV IOMMU" here? It seems like you
will probably have a RISCV_IOMMU_V2 someday, is that naming OK?

Jason