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

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Date:   Wed, 30 Mar 2022 22:50:31 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     ira.weiny@...el.com
Cc:     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 Wed, Mar 30, 2022 at 04:59:13PM -0700, ira.weiny@...el.com wrote:
> From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> 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.
> 
> Each DOE mailbox must support the DOE discovery protocol in addition to
> any number of additional protocols.
> 
> Define core PCI functionality to manage a single PCI DOE mailbox at a
> defined config space offset.  Functionality includes creating, supported
> protocol queries, submit tasks to, and destroying the new state objects.
> 
> If interrupts are desired, interrupts vectors should be allocated prior
> to asking for irq's when creating a mailbox object.

I really don't think this should be built unconditionally and bloat
every single kernel built with PCI support.