linux-kernel - Re: [PATCH 5/7] drm/nouveau/device: Get right pgsize_bitmap of iommu

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Date:   Tue, 25 Jan 2022 10:59:34 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        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
Subject: Re: [PATCH 5/7] drm/nouveau/device: Get right pgsize_bitmap of
 iommu_domain

On 1/24/22 5:29 PM, Christoph Hellwig wrote:
> On Mon, Jan 24, 2022 at 03:11:00PM +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
> 
> Looks good:
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> 
> Wouldn't it mke sense to remove the pgsize_bitmap in struct iommu_ops
> and initialize the domain field in the domain_alloc methods?  Or am I
> missing something?
> 

It looks reasonable to me. The pgsize_bitmap is an attribute of a domain
that provides the map/unmap interfaces. It could be moved out of the
iommu_ops structure.

Best regards,
baolu