linux-kernel - Re: [RFC 09/20] iommu: Add page size and address width attributes

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Date:   Wed, 22 Sep 2021 15:42:55 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     Liu Yi L <yi.l.liu@...el.com>, alex.williamson@...hat.com,
        jgg@...dia.com, hch@....de, jasowang@...hat.com, joro@...tes.org
Cc:     jean-philippe@...aro.org, kevin.tian@...el.com, parav@...lanox.com,
        lkml@...ux.net, pbonzini@...hat.com, lushenming@...wei.com,
        corbet@....net, ashok.raj@...el.com, yi.l.liu@...ux.intel.com,
        jun.j.tian@...el.com, hao.wu@...el.com, dave.jiang@...el.com,
        jacob.jun.pan@...ux.intel.com, kwankhede@...dia.com,
        robin.murphy@....com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        linux-kernel@...r.kernel.org, baolu.lu@...ux.intel.com,
        david@...son.dropbear.id.au, nicolinc@...dia.com
Subject: Re: [RFC 09/20] iommu: Add page size and address width attributes

Hi,

On 9/19/21 8:38 AM, Liu Yi L wrote:
> From: Lu Baolu <baolu.lu@...ux.intel.com>
>
> This exposes PAGE_SIZE and ADDR_WIDTH attributes. The iommufd could use
> them to define the IOAS.
>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  include/linux/iommu.h | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 943de6897f56..86d34e4ce05e 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -153,9 +153,13 @@ enum iommu_dev_features {
>  /**
>   * enum iommu_devattr - Per device IOMMU attributes
>   * @IOMMU_DEV_INFO_FORCE_SNOOP [bool]: IOMMU can force DMA to be snooped.
> + * @IOMMU_DEV_INFO_PAGE_SIZE [u64]: Page sizes that iommu supports.
> + * @IOMMU_DEV_INFO_ADDR_WIDTH [u32]: Address width supported.
I think this deserves additional info. What address width do we talk
about, input, output, what stage if the IOMMU does support multiple stages

Thanks

Eric
>   */
>  enum iommu_devattr {
>  	IOMMU_DEV_INFO_FORCE_SNOOP,
> +	IOMMU_DEV_INFO_PAGE_SIZE,
> +	IOMMU_DEV_INFO_ADDR_WIDTH,
>  };
>  
>  #define IOMMU_PASID_INVALID	(-1U)