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

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Date:   Wed, 30 May 2018 11:28:42 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-pci@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Ingo Molnar <mingo@...nel.org>,
        Christoffer Dall <cdall@...aro.org>,
        Jonathan Corbet <corbet@....net>, timur@...eaurora.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Dongdong Liu <liudongdong3@...wei.com>,
        David Rientjes <rientjes@...gle.com>,
        Thymo van Beers <thymovanbeers@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Frederick Lawler <fred@...dlawl.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        linux-arm-msm@...r.kernel.org,
        Frederic Weisbecker <frederic@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Oza Pawandeep <poza@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Add pci=safemode option

On 5/30/2018 10:56 AM, Bjorn Helgaas wrote:
> This *was* my idea, but I'm starting to think it was a bad idea.
> 
> I don't want people to use pci= parameters as the normal way to get a
> system to boot.  That would be a huge support hassle (putting things
> in release notes, diagnosing problems when people forget it, etc).
> 
> But the parameters *are* useful for debugging.  If we had a
> "pci=safemode" and it avoided some problem, the next step would be to
> narrow it down by using the more specific flags (pci=nomsi, pci=noari,
> pci=no_ext_tags, etc).  So I think 95% of the value is in the specific
> flags, and a "pci=safemode" might add a little bit of value but at the
> cost of a small but nagging maintenance concern and code clutter.

OK. Let's try noXYZ feature. Can you enumerate the XYZ features that you
want to see?

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.