Re: [PATCH v7 08/12] arm: add ALL, QEMU, Rcar3 and MPSoC configs

[Stefano Stabellini <sstabellini@kernel.org>]

On Tue, 24 Jul 2018, Andrii Anisov wrote:
> On 07.07.18 02:13, Stefano Stabellini wrote:
> > Add a "Platform Support" choice with four kconfig options: QEMU, RCAR3,
> > MPSOC and ALL. They enable the required options for their hardware
> > platform. ALL enables all available platforms and it's the default. It
> > doesn't automatically select any of the related drivers, otherwise they
> > cannot be disabled. ALL is implemented by selecting hidden options
> > corresponding to QEMU, MPSOC and RCAR3.
> > 
> > In the case of the MPSOC that has a platform file under
> > arch/arm/platforms/, build the file if MPSOC.
> > 
> > Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
> > CC: artem_mygaiev@epam.com
> > CC: volodymyr_babchuk@epam.com
> > 
> > ---
> > Changes in v5:
> > - turn platform support into a choice
> > - add ALL
> > 
> > Changes in v4:
> > - fix GICv3/GICV3
> > - default y to all options
> > - build xilinx-zynqmp if MPSOC
> > ---
> >   xen/arch/arm/Kconfig            |  2 ++
> >   xen/arch/arm/platforms/Kconfig  | 55
> > +++++++++++++++++++++++++++++++++++++++++
> >   xen/arch/arm/platforms/Makefile |  2 +-
> >   3 files changed, 58 insertions(+), 1 deletion(-)
> >   create mode 100644 xen/arch/arm/platforms/Kconfig
> > 
> > diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
> > index 2b87111..75cacfb 100644
> > --- a/xen/arch/arm/Kconfig
> > +++ b/xen/arch/arm/Kconfig
> > @@ -213,6 +213,8 @@ config ARM64_HARDEN_BRANCH_PREDICTOR
> >   config ARM32_HARDEN_BRANCH_PREDICTOR
> >       def_bool y if ARM_32 && HARDEN_BRANCH_PREDICTOR
> >   +source "arch/arm/platforms/Kconfig"
> > +
> >   source "common/Kconfig"
> >     source "drivers/Kconfig"
> > diff --git a/xen/arch/arm/platforms/Kconfig b/xen/arch/arm/platforms/Kconfig
> > new file mode 100644
> > index 0000000..07c5930
> > --- /dev/null
> > +++ b/xen/arch/arm/platforms/Kconfig
> > @@ -0,0 +1,55 @@
> > +choice
> > +	prompt "Platform Support"
> > +	default ALL
> > +	---help---
> > +	Choose which hardware platform to enable in Xen.
> > +
> > +	If unsure, choose ALL.
> > +
> > +config ALL
> I would suggest to separate it into ALL_ARM32 and ALL_ARM64. Then, in a
> makefile use them for platforms instead of raw ARM32 and ARM64. This would
> make such change really useful: disabling ALL_x will drop all odd platform
> code.

Hi Andrii,

I don't understand the suggestion: ARM32 platforms cannot be enabled on
ARM64 and vice versa. So basically it is as if you always get only
ALL_ARM32 or ALL_ARM64 depending on your target architecture.

Am I missing something?


> > +	bool "All Platforms"
> > +	select MPSOC_PLATFORM
> > +	select QEMU_PLATFORM
> > +	select RCAR3_PLATFORM
> > +	---help---
> > +	Enable support for all available hardware platforms. It doesn't
> > +	automatically select any of the related drivers.
> > +
> > +config QEMU
> > +	bool "QEMU aarch virt machine support"
> > +	depends on ARM_64
> > +	select QEMU_PLATFORM
> > +	select GICV3
> > +	select HAS_PL011
> > +	---help---
> > +	Enable all the required drivers for QEMU aarch64 virt emulated
> > +	machine.
> > +
> > +config RCAR3
> > +	bool "Renesas RCar3 support"
> > +	depends on ARM_64
> > +	select RCAR3_PLATFORM
> > +	select HAS_SCIF
> > +	---help---
> > +	Enable all the required drivers for Renesas RCar3
> > +
> > +config MPSOC
> > +	bool "Xilinx Ultrascale+ MPSoC support"
> > +	depends on ARM_64
> > +	select MPSOC_PLATFORM
> > +	select HAS_CADENCE_UART
> > +	select ARM_SMMU
> > +	---help---
> > +	Enable all the required drivers for Xilinx Ultrascale+ MPSoC
> > +
> > +endchoice
> > +
> > +config QEMU_PLATFORM
> > +	bool
> > +
> > +config RCAR3_PLATFORM
> > +	bool
> > +
> > +config MPSOC_PLATFORM
> Shouldn't MPSOC_PLATFORM be dependent on ARM64?

Yes, and it is, see "config MPSOC" few lines above.


> > +	bool
> > +
> > diff --git a/xen/arch/arm/platforms/Makefile
> > b/xen/arch/arm/platforms/Makefile
> > index 80e555c..a79bdb9 100644
> > --- a/xen/arch/arm/platforms/Makefile
> > +++ b/xen/arch/arm/platforms/Makefile
> > @@ -8,4 +8,4 @@ obj-$(CONFIG_ARM_64) += seattle.o
> >   obj-y += sunxi.o
> >   obj-$(CONFIG_ARM_64) += thunderx.o
> >   obj-$(CONFIG_ARM_64) += xgene-storm.o
> > -obj-$(CONFIG_ARM_64) += xilinx-zynqmp.o
> > +obj-$(CONFIG_MPSOC_PLATFORM)  += xilinx-zynqmp.o

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