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

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Message-ID: <20221101221909.3u5ateevc7ka2ysv@pali>
Date:   Tue, 1 Nov 2022 23:19:09 +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

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
> >