linux-kernel - Re: [PATCH v9 10/11] iommu: Per-domain I/O page fault handling

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Message-ID: <YrsOO9E+j+CMgKMA@myrica>
Date:   Tue, 28 Jun 2022 15:20:43 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     Ethan Zhao <haifeng.zhao@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 10/11] iommu: Per-domain I/O page fault handling

On Tue, Jun 28, 2022 at 07:53:39PM +0800, Baolu Lu wrote:
> > > > Once the iopf_handle_single() is removed, the name of
> > > > iopf_handle_group() looks a little weired
> > > > 
> > > > and confused, does this group mean the iommu group (domain) ?
> > > > while I take some minutes to
> > > 
> > > No. This is not the iommu group. It's page request group defined by the
> > > PCI SIG spec. Multiple page requests could be put in a group with a
> > > same group id. All page requests in a group could be responded to device
> > > in one shot.
> > 
> > Thanks your explaination, understand the concept of PCIe PRG.  I meant
> > 
> > do we still have the necessity to mention the "group" here in the name
> > 
> > iopf_handle_group(),  which one is better ? iopf_handle_prg() or
> > 
> > iopf_handler(),  perhaps none of them ? :)
> 
> Oh! Sorry for the misunderstanding.
> 
> I have no strong feeling to change this naming. :-) All the names
> express what the helper does. Jean is the author of this framework. If
> he has the same idea as you, I don't mind renaming it in this patch.

I'm not attached to the name, and I see how it could be confusing. Given
that io-pgfault is not only for PCIe, 'prg' is not the best here either.
iopf_handle_faults(), or just iopf_handler(), seem more suitable.

Thanks,
Jean