linux-kernel - Re: [PATCH] PCI: Allow drivers to claim exclusive access to config regions

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Message-ID: <CAPcyv4jfq7pqvdKinYJ2wSLSNEa0fmOgCGWjTCpwhgTTpGyY=Q@mail.gmail.com>
Date:   Thu, 25 Mar 2021 10:55:01 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Allow drivers to claim exclusive access to config regions

On Thu, Mar 25, 2021 at 1:29 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Thu, Mar 25, 2021 at 07:54:59AM +0100, Greg Kroah-Hartman wrote:
> > On Wed, Mar 24, 2021 at 06:23:54PM -0700, Dan Williams wrote:
> > > The PCIE Data Object Exchange (DOE) mailbox is a protocol run over
> > > configuration cycles. It assumes one initiator at a time is
> > > reading/writing the data registers.
> >
> > That sounds like a horrible protocol for a multi-processor system.
> > Where is it described and who can we go complain to for creating such a
> > mess?
>
> Indeed.  Dan, is there a way to stilk kill this protocol off before it
> leaks into the wild?

Unfortunately I think that opportunity was more than a year ago, and
there's been a proliferation of derivative protocols building on it
since.