linux-kernel - Re: [PATCH 2/7] agp/intel: Use per device iommu check

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Message-ID: <20220516180423.GH1343366@nvidia.com>
Date:   Mon, 16 May 2022 15:04:23 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ning Sun <ning.sun@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Steve Wahl <steve.wahl@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] agp/intel: Use per device iommu check

On Sat, May 14, 2022 at 09:43:17AM +0800, Lu Baolu wrote:
> The IOMMU subsystem has already provided an interface to query whether
> the IOMMU hardware is enabled for a specific device. This changes the
> check from Intel specific intel_iommu_gfx_mapped (globally exported by
> the Intel IOMMU driver) to probing the presence of IOMMU on a specific
> device using the generic device_iommu_mapped().
> 
> This follows commit cca084692394a ("drm/i915: Use per device iommu check")
> which converted drm/i915 driver to use device_iommu_mapped().
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/char/agp/intel-gtt.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)

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

Jason