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Date: Wed, 30 May 2018 09:48:22 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: okaya@codeaurora.org
Subject: Re: [PATCH] PCI: Add pci=safemode option
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Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>,
 "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
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 Kai-Heng Feng <kai.heng.feng@canonical.com>, Ingo Molnar <mingo@kernel.org>,
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 David Rientjes <rientjes@google.com>,
 Thymo van Beers <thymovanbeers@gmail.com>,
 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
 Frederick Lawler <fred@fredlawl.com>,
 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
 Marc Zyngier <marc.zyngier@arm.com>, linux-arm-msm@vger.kernel.org,
 Frederic Weisbecker <frederic@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
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On Wed, May 30, 2018 at 12:44:29AM -0700, okaya@codeaurora.org wrote:
> On 2018-05-30 00:37, Christoph Hellwig wrote:
> > On Tue, May 29, 2018 at 09:41:33PM -0700, Sinan Kaya wrote:
> > > 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.
> > 
> > Can we please make it a config option the instead of adding code
> > to every kernel?  Also maybe the bringup should be in the name
> > to make this more clear?
> 
> One other requirement was to have a runtime option rather than compile time
> option.
> 
> When someone reported a problem, we wanted to be able to say "use this
> option and see if system boots" without doing any bisects or recompilation.
> 
> This would be the first step in troubleshooting a system to see if
> fundamental features are working.

That makes sense, people can not rebuild their kernels for the most
part.  Putting it behind a config option would not make sense as it
would always have to be enabled.

> I don't mind changing the name Bjorn mentioned safe option. I made it
> safemode. I am looking at Bjorn for suggestions at this moment.

"minimal"?  "basic"?  "crippled"?
"my_hardware_is_so_borked_it_needs_this_option"?  :)

Naming is hard...

greg k-h

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