linux-kernel - Re: [PATCH V7 03/10] PCI: Create PCI library functions in support of DOE mailboxes.

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Message-ID: <20220402144845.GA7822@wunner.de>
Date:   Sat, 2 Apr 2022 16:48:45 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH V7 03/10] PCI: Create PCI library functions in support of
 DOE mailboxes.

On Thu, Mar 31, 2022 at 08:19:56AM -0700, Ira Weiny wrote:
> On Wed, Mar 30, 2022 at 10:50:31PM -0700, Christoph Hellwig wrote:
> > On Wed, Mar 30, 2022 at 04:59:13PM -0700, ira.weiny@...el.com wrote:
> > > Introduced in a PCI v6.0[1], DOE provides a config space based mailbox
> > > with standard protocol discovery.  Each mailbox is accessed through a
> > > DOE Extended Capability.
> > 
> > I really don't think this should be built unconditionally and bloat
> > every single kernel built with PCI support.
> 
> I can add a Kconfig.

Ideally, that config option should live in the pcie/ subdirectory,
i.e. in drivers/pci/pcie/Kconfig, alongside drivers/pci/pcie/doe.c,
as we try to consolidate PCIe-specific features there and reserve
core code in drivers/pci/*.c for functionality that also applies
to Conventional PCI.

Thanks,

Lukas