linux-kernel - Re: [PATCH] powerpc/fsl-pci: Choose PCI host bridge with alias pci0 as the primary

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Message-ID: <20221126162313.kn7ibopmwwfwrfvx@pali>
Date:   Sat, 26 Nov 2022 17:23:13 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/fsl-pci: Choose PCI host bridge with alias pci0
 as the primary

PING?

On Tuesday 01 November 2022 23:19:09 Pali Rohár wrote:
> Hello! I would like to remind this patch.
> 
> On Sunday 09 October 2022 13:08:08 Pali Rohár wrote:
> > Hello! Any opinion on this patch?
> > 
> > On Saturday 20 August 2022 14:33:27 Pali Rohár wrote:
> > > If there's no PCI host bridge with ISA then check for PCI host bridge with
> > > alias "pci0" (first PCI host bridge) and if it exists then choose it as the
> > > primary PCI host bridge.
> > > 
> > > This makes choice of primary PCI host bridge more stable across boots and
> > > updates as the last fallback candidate for primary PCI host bridge (if
> > > there is no choice) is selected arbitrary.
> > > 
> > > Signed-off-by: Pali Rohár <pali@...nel.org>
> > > ---
> > >  arch/powerpc/sysdev/fsl_pci.c | 13 +++++++++++++
> > >  1 file changed, 13 insertions(+)
> > > 
> > > diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
> > > index 1011cfea2e32..e4b703943dd3 100644
> > > --- a/arch/powerpc/sysdev/fsl_pci.c
> > > +++ b/arch/powerpc/sysdev/fsl_pci.c
> > > @@ -1125,6 +1125,19 @@ void __init fsl_pci_assign_primary(void)
> > >  			return;
> > >  	}
> > >  
> > > +	/*
> > > +	 * If there's no PCI host bridge with ISA then check for
> > > +	 * PCI host bridge with alias "pci0" (first PCI host bridge).
> > > +	 */
> > > +	np = of_find_node_by_path("pci0");
> > > +	if (np && of_match_node(pci_ids, np) && of_device_is_available(np)) {
> > > +		fsl_pci_primary = np;
> > > +		of_node_put(np);
> > > +		return;
> > > +	}
> > > +	if (np)
> > > +		of_node_put(np);
> > > +
> > >  	/*
> > >  	 * If there's no PCI host bridge with ISA, arbitrarily
> > >  	 * designate one as primary.  This can go away once
> > > -- 
> > > 2.20.1
> > >