linux-kernel - Re: [PATCH v7 04/23] iommu: Introduce attach/detach_pasid

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Date:   Wed, 15 May 2019 13:09:49 +0100
From:   Jean-Philippe Brucker <jean-philippe.brucker@....com>
To:     Eric Auger <eric.auger@...hat.com>, eric.auger.pro@...il.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu, joro@...tes.org,
        alex.williamson@...hat.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, will.deacon@....com, robin.murphy@....com
Cc:     peter.maydell@...aro.org, kevin.tian@...el.com,
        vincent.stehle@....com, ashok.raj@...el.com, marc.zyngier@....com,
        christoffer.dall@....com
Subject: Re: [PATCH v7 04/23] iommu: Introduce attach/detach_pasid_table API

On 08/04/2019 13:18, Eric Auger wrote:
> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
> index edcc0dda7993..532a64075f23 100644
> --- a/include/uapi/linux/iommu.h
> +++ b/include/uapi/linux/iommu.h
> @@ -112,4 +112,51 @@ struct iommu_fault {
>  		struct iommu_fault_page_request prm;
>  	};
>  };
> +
> +/**
> + * SMMUv3 Stream Table Entry stage 1 related information
> + * The PASID table is referred to as the context descriptor (CD) table.
> + *
> + * @s1fmt: STE s1fmt (format of the CD table: single CD, linear table
> +   or 2-level table)

Running "scripts/kernel-doc -v -none" on this header produces some
warnings. Not sure if we want to get rid of all of them, but we should
at least fix the coding style for this comment (line must start with
" * "). I'm fixing it up on my sva/api branch

Thanks,
Jean

> + * @s1dss: STE s1dss (specifies the behavior when pasid_bits != 0
> +   and no pasid is passed along with the incoming transaction)
> + * Please refer to the smmu 3.x spec (ARM IHI 0070A) for full details
> + */
> +struct iommu_pasid_smmuv3 {
> +#define PASID_TABLE_SMMUV3_CFG_VERSION_1 1
> +	__u32	version;
> +	__u8 s1fmt;
> +	__u8 s1dss;
> +	__u8 padding[2];
> +};