linux-kernel - Re: [PATCH 1/2] PCI/DPC: Add 'nodpc' parameter

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Date:   Thu, 16 Aug 2018 21:28:45 +0000
From:   "Derrick, Jonathan" <jonathan.derrick@...el.com>
To:     "Busch, Keith" <keith.busch@...el.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "okaya@...nel.org" <okaya@...nel.org>,
        "willy@...radead.org" <willy@...radead.org>,
        "liudongdong3@...wei.com" <liudongdong3@...wei.com>,
        "helgaas@...nel.org" <helgaas@...nel.org>,
        "poza@...eaurora.org" <poza@...eaurora.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/2] PCI/DPC: Add 'nodpc' parameter

On Thu, 2018-08-16 at 15:19 -0600, Keith Busch wrote:
> On Thu, Aug 16, 2018 at 01:50:42PM -0700, Derrick, Jonathan wrote:
> > It can also be disabled with setpci, but is that any less of a
> > hassle?
> > Genuine question to understand your point of view.
> 
> That is not a real solution, IMO. 'setpci' is good to inject things
> for testing, but it changes config space without the kernel aware
> that
> you've done that, so it is inherently racey with other kernel threads
> touching pci config space. And the kernel or platform may end up
> undoing
> what you had 'setpci' do anyway with no immediate way to be notified
> it
> was changed.

It sounds like a sysfs toggle could be useful regardless of the boot
parameter.
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