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SubjectRe: [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@kernel.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
> >

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