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Message-ID: <20180621165400.GB14519@e107981-ln.cambridge.arm.com>
Date: Thu, 21 Jun 2018 17:54:00 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Jan Kiszka <jan.kiszka@...mens.com>,
Scott Branden <scott.branden@...adcom.com>,
Ley Foon Tan <lftan@...era.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Will Deacon <will.deacon@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh@...nel.org>,
Russell King <linux@...linux.org.uk>,
Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v2] PCI: controller: Move PCI_DOMAINS selection to arch
Kconfig
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@...ck-us.net>
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> > Cc: Scott Branden <scott.branden@...adcom.com>
> > Cc: Will Deacon <will.deacon@....com>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Rob Herring <robh@...nel.org>
> > Cc: Russell King <linux@...linux.org.uk>
> > Cc: Jan Kiszka <jan.kiszka@...mens.com>
> > Cc: Guenter Roeck <linux@...ck-us.net>
> > Cc: Ley Foon Tan <lftan@...era.com>
> > ---
> > 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@...mens.com>
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.
Thanks,
Lorenzo
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