Re: [PATCH v2] PCI: controller: Move PCI_DOMAINS selection to arch Kconfig

From: Lorenzo Pieralisi
Date: Mon Jun 25 2018 - 05:26:24 EST

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On Fri, Jun 22, 2018 at 11:59:08PM +0800, Ley Foon Tan wrote:
> On Thu, 2018-06-21 at 22:08 -0700, Scott Branden wrote:
> >
> >
> > On 18-06-21 09:54 AM, Lorenzo Pieralisi wrote:
> > >
> > >
> > > On Wed, Jun 20, 2018 at 10:07:33AM +0200, Jan Kiszka wrote:
> > > >
> > > >
> > > > On 2018-06-19 13:21, Lorenzo Pieralisi wrote:
> > > > >
> > > > >
> > > > > Commit 51bc085d6454 ("PCI: Improve host drivers compile test
> > > > > coverage")
> > > > > added configuration options to allow PCI host controller
> > > > > drivers to be
> > > > > compile tested on all architectures.
> > > > >
> > > > > Some host controller drivers (eg PCIE_ALTERA) config entries
> > > > > select
> > > > > the PCI_DOMAINS config option to enable PCI domains management
> > > > > in
> > > > > the kernel. Now that host controller drivers can be compiled on
> > > > > all architectures, this triggers build regressions on arches
> > > > > that
> > > > > do not implement the PCI_DOMAINS required API (ie
> > > > > pci_domain_nr()):
> > > > >
> > > > > drivers/ata/pata_ali.c: In function 'ali_init_chipset':
> > > > > drivers/ata/pata_ali.c:469:38: error:
> > > > >          implicit declaration of function 'pci_domain_nr';
> > > > >                                            did you mean
> > > > > 'pci_iomap_wc'?
> > > > >
> > > > > Furthemore, some software configurations (ie Jailhouse) require
> > > > > a
> > > > > PCI_DOMAINS enabled kernel to configure multiple host
> > > > > controllers
> > > > > without having an explicit dependency on the ARM platform on
> > > > > which
> > > > > they run.
> > > > >
> > > > > Make PCI_DOMAINS a visible configuration option on ARM so that
> > > > > software
> > > > > configurations that need it can manually select it and move the
> > > > > PCI_DOMAINS selection from PCI controllers configuration file
> > > > > to ARM
> > > > > sub-arch config entries that currently require it, fixing the
> > > > > issue.
> > > > >
> > > > > Fixes: 51bc085d6454 ("PCI: Improve host drivers compile test
> > > > > coverage")
> > > > > Link: https://lkml.kernel.org/r/20180612170229.GA10141@roeck-us
> > > > > .net
> > > > > Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> > > > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> > > > > Cc: Scott Branden <scott.branden@xxxxxxxxxxxx>
> > > > > Cc: Will Deacon <will.deacon@xxxxxxx>
> > > > > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> > > > > Cc: Rob Herring <robh@xxxxxxxxxx>
> > > > > Cc: Russell King <linux@xxxxxxxxxxxxxxx>
> > > > > Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> > > > > Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> > > > > Cc: Ley Foon Tan <lftan@xxxxxxxxxx>
> > > > > ---
> > > > > v1 -> v2
> > > > >     - Removed ARCH_VIRT PCI_DOMAINS selection
> > > > >     - Added PCI_DOMAINS visible config option
> > > > >
> > > > > v1: https://marc.info/?l=linux-pci&m=152932092612352&w=2
> > > > >
> > > > > arch/arm/Kconfig               | 8 +++++++-
> > > > > arch/arm/mach-bcm/Kconfig      | 1 +
> > > > > arch/arm/mach-socfpga/Kconfig  | 1 +
> > > > > drivers/pci/controller/Kconfig | 3 ---
> > > > > 4 files changed, 9 insertions(+), 4 deletions(-)
> > > > >
> > > > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> > > > > index 54eeb8d00bc6..843edfd000be 100644
> > > > > --- a/arch/arm/Kconfig
> > > > > +++ b/arch/arm/Kconfig
> > > > > @@ -1245,8 +1245,14 @@ config PCI
> > > > >       VESA. If you have PCI, say Y, otherwise N.
> > > > >
> > > > > config PCI_DOMAINS
> > > > > -   bool
> > > > > +   bool "Support for multiple PCI domains"
> > > > >     depends on PCI
> > > > > +   help
> > > > > +     Enable PCI domains kernel management. Say Y if your
> > > > > machine
> > > > > +     has a PCI bus hierarchy that requires more than one PCI
> > > > > +     domain (aka segment) to be correctly managed. Say N
> > > > > otherwise.
> > > > > +
> > > > > +     If you don't know what to do here, say N.
> > > > >
> > > > > config PCI_DOMAINS_GENERIC
> > > > >     def_bool PCI_DOMAINS
> > > > > diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-
> > > > > bcm/Kconfig
> > > > > index c46a728df44e..25aac6ee2ab1 100644
> > > > > --- a/arch/arm/mach-bcm/Kconfig
> > > > > +++ b/arch/arm/mach-bcm/Kconfig
> > > > > @@ -20,6 +20,7 @@ config ARCH_BCM_IPROC
> > > > >     select GPIOLIB
> > > > >     select ARM_AMBA
> > > > >     select PINCTRL
> > > > > +   select PCI_DOMAINS if PCI
> > > > >     help
> > > > >       This enables support for systems based on Broadcom IPROC
> > > > > architected SoCs.
> > > > >       The IPROC complex contains one or more ARM CPUs along
> > > > > with common
> > > > > diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-
> > > > > socfpga/Kconfig
> > > > > index d0f62eacf59d..4adb901dd5eb 100644
> > > > > --- a/arch/arm/mach-socfpga/Kconfig
> > > > > +++ b/arch/arm/mach-socfpga/Kconfig
> > > > > @@ -10,6 +10,7 @@ menuconfig ARCH_SOCFPGA
> > > > >     select HAVE_ARM_SCU
> > > > >     select HAVE_ARM_TWD if SMP
> > > > >     select MFD_SYSCON
> > > > > +   select PCI_DOMAINS if PCI
> > > > >
> > > > > if ARCH_SOCFPGA
> > > > > config SOCFPGA_SUSPEND
> > > > > diff --git a/drivers/pci/controller/Kconfig
> > > > > b/drivers/pci/controller/Kconfig
> > > > > index 18fa09b3ac8f..cc9fa02d32a0 100644
> > > > > --- a/drivers/pci/controller/Kconfig
> > > > > +++ b/drivers/pci/controller/Kconfig
> > > > > @@ -96,7 +96,6 @@ config PCI_HOST_GENERIC
> > > > >     depends on OF
> > > > >     select PCI_HOST_COMMON
> > > > >     select IRQ_DOMAIN
> > > > > -   select PCI_DOMAINS
> > > > >     help
> > > > >       Say Y here if you want to support a simple generic PCI
> > > > > host
> > > > >       controller, such as the one emulated by kvmtool.
> > > > > @@ -138,7 +137,6 @@ config PCI_VERSATILE
> > > > >
> > > > > config PCIE_IPROC
> > > > >     tristate
> > > > > -   select PCI_DOMAINS
> > > > >     help
> > > > >       This enables the iProc PCIe core controller support for
> > > > > Broadcom's
> > > > >       iProc family of SoCs. An appropriate bus interface driver
> > > > > needs
> > > > > @@ -176,7 +174,6 @@ config PCIE_IPROC_MSI
> > > > > config PCIE_ALTERA
> > > > >     bool "Altera PCIe controller"
> > > > >     depends on ARM || NIOS2 || COMPILE_TEST
> > > > > -   select PCI_DOMAINS
> > > > >     help
> > > > >       Say Y here if you want to enable PCIe controller support
> > > > > on Altera
> > > > >       FPGA.
> > > > >
> > > > Acked-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> > > Thanks a lot. Scott, Ley Foon, does it work for you ? I would like
> > > to ask Bjorn to send it asap since the build on sparc is still
> > > broken.
> > Change will have to be made for arm64 for ARCH_BCM_IPROC as well.
> Yes, need to add it to arm64 too. Others are okay.

On arm64 CONFIG_PCI_DOMAINS defaults to CONFIG_PCI so there is no need
to select it, if that's all you need changed there is nothing to
change and this patch is read to be merged.

Lorenzo

Next message: Andrea Merello: "[PATCH v3 1/5] dmaengine: xilinx_dma: in axidma slave_sg and dma_cylic mode align split descriptors"
Previous message: Geert Uytterhoeven: "Re: [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver"
Next in thread: Scott Branden: "Re: [PATCH v2] PCI: controller: Move PCI_DOMAINS selection to arch Kconfig"
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