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

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Message-ID: <20210325082904.GA2988566@infradead.org>
Date:   Thu, 25 Mar 2021 08:29:04 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Dan Williams <dan.j.williams@...el.com>, bhelgaas@...gle.com,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Allow drivers to claim exclusive access to config
 regions

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?