linux-kernel - Re: [PATCH v2 06/10] drm/nouveau/device: Get right pgsize_bitmap of iommu

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Date:   Wed, 9 Feb 2022 09:31:39 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 06/10] drm/nouveau/device: Get right pgsize_bitmap of
 iommu_domain

On Tue, Feb 08, 2022 at 09:25:55AM +0800, Lu Baolu wrote:
> The supported page sizes of an iommu_domain are saved in the pgsize_bitmap
> field. Retrieve the value from the right place.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Robin Murphy <robin.murphy@....com>
> Link: https://lore.kernel.org/r/20211218074546.1772553-1-baolu.lu@linux.intel.com
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
>  drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

IMHO it is weird that the ops have a pgsize_bitmap at all.

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

Jason