[PATCH v2 09/18] pci: Add config for Enhanced Allocation

[Bin Meng]

On Thu, Apr 14, 2022 at 12:30 AM Andrew Scull <ascull at google.com> wrote:
>
> > > diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> > > index 47cd074aa1..fd2203420c 100644
> > > --- a/drivers/pci/Kconfig
> > > +++ b/drivers/pci/Kconfig
> > > @@ -67,6 +67,13 @@ config PCI_SRIOV
> > >           if available on a PCI Physical Function device and probe for
> > >           applicable drivers.
> > >
> > > +config PCI_ENHANCED_ALLOCATION
> > > +       bool "Enable support for Enhanced Allocation of resources"
> > > +       default y
> > > +       help
> > > +         Enable support for Enhanced Allocation which can be used by supported
> > > +         devices in place of traditional BARS for allocation of resources.
> > > +
> >
> > Why do we need a config option for EA as it can be figured out in the run time?
>
> I wanted to have the option to disable the logic for handling EA at
> runtime. A glance at the code suggested there's a whole other rabbit
> hole of missing safety checks that I've opted to leave for another
> day.

We cannot have a single global option to work for one device using EA
but another device using BAR.

Regards,
Bin