linux-kernel - Re: [PATCH v2 08/12] mm: Define pasid in mm

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Message-ID: <20200616082819.GA590740@myrica>
Date:   Tue, 16 Jun 2020 10:28:19 +0200
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Joerg Roedel <joro@...tes.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Jacob Jun Pan <jacob.jun.pan@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sohil Mehta <sohil.mehta@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        x86 <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        amd-gfx <amd-gfx@...ts.freedesktop.org>,
        iommu@...ts.linux-foundation.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 08/12] mm: Define pasid in mm

On Fri, Jun 12, 2020 at 05:41:29PM -0700, Fenghua Yu wrote:
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 64ede5f150dc..5778db3aa42d 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -538,6 +538,10 @@ struct mm_struct {
>  		atomic_long_t hugetlb_usage;
>  #endif
>  		struct work_struct async_put_work;
> +
> +#ifdef CONFIG_PCI_PASID

Non-PCI devices can also use a PASID (e.g. Arm's SubstreamID). How about
CONFIG_IOMMU_SUPPORT?

Thanks,
Jean

> +		unsigned int pasid;
> +#endif