linux-kernel - Re: [RFC PATCH 2/5] drivers/base: add a function to test peer to peer capability

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Date:   Tue, 29 Jan 2019 14:54:23 -0500
From:   Jerome Glisse <jglisse@...hat.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christian Koenig <christian.koenig@....com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Jason Gunthorpe <jgg@...lanox.com>, linux-pci@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <jroedel@...e.de>,
        iommu@...ts.linux-foundation.org
Subject: Re: [RFC PATCH 2/5] drivers/base: add a function to test peer to
 peer capability

On Tue, Jan 29, 2019 at 11:26:01AM -0700, Logan Gunthorpe wrote:
> 
> 
> On 2019-01-29 10:47 a.m., 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.
> 
> This doesn't appear to be used in any of the further patches; so it's
> very confusing.
> 
> I'm not sure a struct device wrapper is really necessary...

I wanted to allow other non pci device to join in the fun but
yes right now i have only be doing this on pci devices.

Jérôme