linux-kernel - Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig

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Date:   Tue, 14 Mar 2017 19:24:14 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Andi Kleen <ak@...ux.intel.com>,
        Andi Kleen <andi@...stfloor.org>, bhelgaas@...gle.com,
        x86@...nel.org, linux-pci@...r.kernel.org, eranian@...gle.com,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] x86, pci: Add interface to force mmconfig

> I agree that it should be fairly safe to do ECAM/MMCONFIG without
> locking.  Can we handle the decision part by adding a "lockless" bit
> to struct pci_ops?  Old ops don't mention that bit, so it will be
> initialized to zero and we'll do locking as today.  ECAM/MMCONFIG ops
> can set it and we can skip the locking.

That's what my other patch already did. 

-Andi