linux-kernel - Re: [PATCH 1/2] powerpc/pci: Allow to disable filling deprecated pci-OF-bus-map

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Message-ID: <20221101222603.h3nlrp6xuhrnkmht@pali>
Date:   Tue, 1 Nov 2022 23:26:03 +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 1/2] powerpc/pci: Allow to disable filling deprecated
 pci-OF-bus-map

Hello! Gentle reminder...

On Sunday 09 October 2022 13:25:55 Pali Rohár wrote:
> Hello! Any comments on this? It would be nice to take these two patches
> (or at least patch 2) to finally enable PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
> by default where possible.
> 
> Per following comment there can be an issue with early powermac so seems
> that PPC_PCI_OF_BUS_MAP_FILL still has to be by default enabled (which
> implies that PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT is disabled) on powermac:
> https://lore.kernel.org/linuxppc-dev/575f239205e8635add81c9f902b7d9db7beb83ea.camel@kernel.crashing.org/
> 
> On Wednesday 17 August 2022 18:39:26 Pali Rohár wrote:
> > Creating or filling pci-OF-bus-map property in the device-tree is
> > deprecated since May 2006 [1]. Allow to disable filling this property by
> > unsetting config option CONFIG_PPC_PCI_OF_BUS_MAP_FILL for remaining chrp
> > and powermac code.
> > 
> > Disabling of pci-OF-bus-map property allows to enable new option
> > CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT also for chrp and powermac.
> > 
> > [1] - https://lore.kernel.org/linuxppc-dev/1148016268.13249.14.camel@localhost.localdomain/
> > 
> > Signed-off-by: Pali Rohár <pali@...nel.org>
> > ---
> >  arch/powerpc/Kconfig         | 12 +++++++++++-
> >  arch/powerpc/kernel/pci_32.c |  6 ++++++
> >  2 files changed, 17 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> > index 5881441f7672..df2696c406ad 100644
> > --- a/arch/powerpc/Kconfig
> > +++ b/arch/powerpc/Kconfig
> > @@ -373,9 +373,19 @@ config PPC_DCR
> >  	depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
> >  	default y
> >  
> > +config PPC_PCI_OF_BUS_MAP_FILL
> > +	bool "Fill pci-OF-bus-map property in the device-tree"
> > +	depends on PPC32
> > +	depends on PPC_PMAC || PPC_CHRP
> > +	default y
> > +	help
> > +	  This option creates and fills pci-OF-bus-map property in the
> > +	  device-tree which is deprecated and is needed only for old
> > +	  platforms.
> > +
> >  config PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT
> >  	depends on PPC32
> > -	depends on !PPC_PMAC && !PPC_CHRP
> > +	depends on !PPC_PCI_OF_BUS_MAP_FILL
> >  	bool "Assign PCI bus numbers from zero individually for each PCI domain"
> >  	help
> >  	  By default on PPC32 were PCI bus numbers unique across all PCI domains.
> > diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c
> > index 433965bf37b4..ffc4e1928c80 100644
> > --- a/arch/powerpc/kernel/pci_32.c
> > +++ b/arch/powerpc/kernel/pci_32.c
> > @@ -64,6 +64,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixu
> >  
> >  #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
> >  
> > +#ifdef CONFIG_PPC_PCI_OF_BUS_MAP_FILL
> > +
> >  static u8* pci_to_OF_bus_map;
> >  static int pci_bus_count;
> >  
> > @@ -223,6 +225,8 @@ pci_create_OF_bus_map(void)
> >  }
> >  #endif
> >  
> > +#endif /* CONFIG_PPC_PCI_OF_BUS_MAP_FILL */
> > +
> >  #endif /* defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP) */
> >  
> >  void pcibios_setup_phb_io_space(struct pci_controller *hose)
> > @@ -264,6 +268,7 @@ static int __init pcibios_init(void)
> >  	}
> >  
> >  #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_PPC_CHRP)
> > +#ifdef CONFIG_PPC_PCI_OF_BUS_MAP_FILL
> >  	pci_bus_count = next_busno;
> >  
> >  	/* OpenFirmware based machines need a map of OF bus
> > @@ -272,6 +277,7 @@ static int __init pcibios_init(void)
> >  	 */
> >  	if (pci_assign_all_buses)
> >  		pcibios_make_OF_bus_map();
> > +#endif
> >  #endif
> >  
> >  	/* Call common code to handle resource allocation */
> > -- 
> > 2.20.1
> >