Re: [PATCH] PCI: Add pci=safemode option

[okaya]

On 2018-05-30 00:56, okaya@xxxxxxxxxxxxxx wrote:
> On 2018-05-30 00:48, Greg Kroah-Hartman wrote:
> > On Wed, May 30, 2018 at 12:44:29AM -0700, okaya@xxxxxxxxxxxxxx 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.
>
> Here is where the discussion took place. Last 5-10  messages should 
> help.
>
>
> https://bugzilla.kernel.org/show_bug.cgi?id=196197

Some more paper trail for general awareness.

https://lkml.org/lkml/2018/5/3/509

> > > 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