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Date: Tue, 11 Jul 2017 20:51:37 +0200
From: "Luis R. Rodriguez" <mcgrof@...nel.org>
To: Palmer Dabbelt <palmer@...belt.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Guenter Roeck <linux@...ck-us.net>, linux-pci@...r.kernel.org
Cc: yamada.masahiro@...ionext.com, mmarek@...e.com,
will.deacon@....com, peterz@...radead.org, boqun.feng@...il.com,
mingo@...hat.com, daniel.lezcano@...aro.org, tglx@...utronix.de,
jason@...edaemon.net, marc.zyngier@....com,
gregkh@...uxfoundation.org, jslaby@...e.com, davem@...emloft.net,
mchehab@...nel.org, sfr@...b.auug.org.au, fweisbec@...il.com,
viro@...iv.linux.org.uk, mcgrof@...nel.org, dledford@...hat.com,
bart.vanassche@...disk.com, sstabellini@...nel.org,
daniel.vetter@...ll.ch, mpe@...erman.id.au, msalter@...hat.com,
nicolas.dichtel@...nd.com, james.hogan@...tec.com,
paul.gortmaker@...driver.com, linux@...ck-us.net,
heiko.carstens@...ibm.com, schwidefsky@...ibm.com,
linux-kernel@...r.kernel.org, patches@...ups.riscv.org,
akpm@...ux-foundation.org, albert@...ive.com
Subject: Re: [PATCH 03/17] pci: Add a generic, weakly-linked pcibios_fixup_bus
On Mon, Jul 10, 2017 at 06:39:10PM -0700, Palmer Dabbelt wrote:
> Multiple architectures define this as an empty function, and I'm adding
> another one as part of the RISC-V port. This adds a __weak version of
> pci_fixup_bios and deletes the now obselete ones in a handful of ports.
>
> The only functional change should be that microblaze used to export
> pcibios_fixup_bus. None of the other architectures export this, so I
> just dropped it.
>
> Signed-off-by: Palmer Dabbelt <palmer@...belt.com>
Reviewed-by: Luis R. Rodriguez <mcgrof@...nel.org>
But this should also get review by Bjorn and linux-pci, now Cc'd. Finally a series of
build tests across all architectures would be good too, but for that I'll ask for
Guenter's help once you have your respective branch up.
Luis
> ---
> arch/cris/arch-v32/drivers/pci/bios.c | 4 ----
> arch/microblaze/pci/pci-common.c | 6 ------
> arch/s390/pci/pci.c | 4 ----
> arch/sh/drivers/pci/pci.c | 8 --------
> arch/tile/kernel/pci.c | 8 --------
> arch/tile/kernel/pci_gx.c | 5 -----
> drivers/pci/probe.c | 10 ++++++++++
> 7 files changed, 10 insertions(+), 35 deletions(-)
>
> diff --git a/arch/cris/arch-v32/drivers/pci/bios.c b/arch/cris/arch-v32/drivers/pci/bios.c
> index 394c2a73d5e2..5cc622c0225e 100644
> --- a/arch/cris/arch-v32/drivers/pci/bios.c
> +++ b/arch/cris/arch-v32/drivers/pci/bios.c
> @@ -2,10 +2,6 @@
> #include <linux/kernel.h>
> #include <hwregs/intr_vect.h>
>
> -void pcibios_fixup_bus(struct pci_bus *b)
> -{
> -}
> -
> void pcibios_set_master(struct pci_dev *dev)
> {
> u8 lat;
> diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
> index 7a332e9f1de0..5835c09c6e26 100644
> --- a/arch/microblaze/pci/pci-common.c
> +++ b/arch/microblaze/pci/pci-common.c
> @@ -810,12 +810,6 @@ void pcibios_setup_bus_devices(struct pci_bus *bus)
> }
> }
>
> -void pcibios_fixup_bus(struct pci_bus *bus)
> -{
> - /* nothing to do */
> -}
> -EXPORT_SYMBOL(pcibios_fixup_bus);
> -
> /*
> * We need to avoid collisions with `mirrored' VGA ports
> * and other strange ISA hardware, so we always want the
> diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
> index 7b30af5da222..ddb9923fb45d 100644
> --- a/arch/s390/pci/pci.c
> +++ b/arch/s390/pci/pci.c
> @@ -262,10 +262,6 @@ static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
> return rc;
> }
>
> -void pcibios_fixup_bus(struct pci_bus *bus)
> -{
> -}
> -
> resource_size_t pcibios_align_resource(void *data, const struct resource *res,
> resource_size_t size,
> resource_size_t align)
> diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
> index c99ee286b69f..749642e1272e 100644
> --- a/arch/sh/drivers/pci/pci.c
> +++ b/arch/sh/drivers/pci/pci.c
> @@ -155,14 +155,6 @@ static int __init pcibios_init(void)
> subsys_initcall(pcibios_init);
>
> /*
> - * Called after each bus is probed, but before its children
> - * are examined.
> - */
> -void pcibios_fixup_bus(struct pci_bus *bus)
> -{
> -}
> -
> -/*
> * We need to avoid collisions with `mirrored' VGA ports
> * and other strange ISA hardware, so we always want the
> * addresses to be allocated in the 0x000-0x0ff region
> diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
> index 284ed23b3914..8999a20ed9d1 100644
> --- a/arch/tile/kernel/pci.c
> +++ b/arch/tile/kernel/pci.c
> @@ -359,14 +359,6 @@ int __init pcibios_init(void)
> }
> subsys_initcall(pcibios_init);
>
> -/*
> - * No bus fixups needed.
> - */
> -void pcibios_fixup_bus(struct pci_bus *bus)
> -{
> - /* Nothing needs to be done. */
> -}
> -
> void pcibios_set_master(struct pci_dev *dev)
> {
> /* No special bus mastering setup handling. */
> diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
> index bdc623b91f7a..0a7642184a9a 100644
> --- a/arch/tile/kernel/pci_gx.c
> +++ b/arch/tile/kernel/pci_gx.c
> @@ -1029,11 +1029,6 @@ int __init pcibios_init(void)
> }
> subsys_initcall(pcibios_init);
>
> -/* No bus fixups needed. */
> -void pcibios_fixup_bus(struct pci_bus *bus)
> -{
> -}
> -
> /* Process any "pci=" kernel boot arguments. */
> char *__init pcibios_setup(char *str)
> {
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index c31310db0404..2ef1248bf112 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2288,6 +2288,16 @@ void pcie_bus_configure_settings(struct pci_bus *bus)
> }
> EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
>
> +/*
> + * Called after each bus is probed, but before its children are examined. This
> + * is marked as __weak because multiple architectures define it
> + */
> +__attribute__ ((weak))
> +void pcibios_fixup_bus(struct pci_bus *bus)
> +{
> + /* nothing to do, expected to be removed in the future */
> +}
> +
> unsigned int pci_scan_child_bus(struct pci_bus *bus)
> {
> unsigned int devfn, pass, max = bus->busn_res.start;
> --
> 2.13.0
>
>
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