linux-kernel - Re: [PATCH v2] PCI: controller: Move PCI

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Date:   Mon, 25 Jun 2018 10:27:58 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Ley Foon Tan <ley.foon.tan@...el.com>
Cc:     Scott Branden <scott.branden@...adcom.com>,
        Jan Kiszka <jan.kiszka@...mens.com>, 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 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@...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.
> > 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