linux-kernel - Re: [PATCH] PCI: Add pci=safemode option

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Date:   Sat, 2 Jun 2018 19:43:07 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pci@...r.kernel.org, timur@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Jonathan Corbet <corbet@....net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Christoffer Dall <cdall@...aro.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Thymo van Beers <thymovanbeers@...il.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        David Rientjes <rientjes@...gle.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Dongdong Liu <liudongdong3@...wei.com>,
        Frederick Lawler <fred@...dlawl.com>,
        Oza Pawandeep <poza@...eaurora.org>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Add pci=safemode option

Hi!

> > And you should explain what exactly in PCI is "optional".  Who defines
> > this and where is that list and what can go wrong if those options are
> > not enabled?
> 
> Bjorn and I discussed the need for such a "safe" mode feature when you
> want to bring up PCI for a platform. You want to turn off everything as
> a starter and just stick to bare minimum.
> 
> I can add a few words describing them. The goal of this option is to keep
> base PCI features with MSI only. Things like PME, AER, ASPM, Extended
> Tags, LTR, Relaxed Ordering, SRIOV are all considered optional. safemode
> is certainly not intended for production environments. 
> 
> I can taint the kernel as a suggestion.

I don't think tainting is required. even modern platforms should work
in the safe mode.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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