linux-kernel - Re: [RFC PATCH 1/5] pci/p2p: add a function to test peer to peer capability

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Date:   Tue, 29 Jan 2019 15:00:31 -0500
From:   Jerome Glisse <jglisse@...hat.com>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     linux-mm <linux-mm@...ck.org>, Joerg Roedel <jroedel@...e.de>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, Christoph Hellwig <hch@....de>,
        iommu@...ts.linux-foundation.org,
        Jason Gunthorpe <jgg@...lanox.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Christian Koenig <christian.koenig@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [RFC PATCH 1/5] pci/p2p: add a function to test peer to peer
 capability

On Tue, Jan 29, 2019 at 02:56:38PM -0500, Alex Deucher wrote:
> On Tue, Jan 29, 2019 at 12:47 PM <jglisse@...hat.com> wrote:
> >
> > From: Jérôme Glisse <jglisse@...hat.com>
> >
> > device_test_p2p() return true if two devices can peer to peer to
> > each other. We add a generic function as different inter-connect
> > can support peer to peer and we want to genericaly test this no
> > matter what the inter-connect might be. However this version only
> > support PCIE for now.
> >
> 
> What about something like these patches:
> https://cgit.freedesktop.org/~deathsimple/linux/commit/?h=p2p&id=4fab9ff69cb968183f717551441b475fabce6c1c
> https://cgit.freedesktop.org/~deathsimple/linux/commit/?h=p2p&id=f90b12d41c277335d08c9dab62433f27c0fadbe5
> They are a bit more thorough.

Yes it would be better, i forgot about those. I can include them
next time i post. Thank you for reminding me about those :)

Cheers,
Jérôme