Re: [PATCH v3] sunxi-irq: Fix Kconfig dependency on GENERIC_IRQ_CHIP

[Andre Przywara]

Hi Maxime,

On 05/05/16 14:21, Maxime Ripard wrote:
> On Wed, May 04, 2016 at 11:44:48AM +0100, Andre Przywara wrote:
>> Hi Maxime,
>>
>> On 02/05/16 07:48, Maxime Ripard wrote:
>>> Hi,
>>>
>>> On Mon, Apr 25, 2016 at 02:04:52AM +0100, Andre Przywara wrote:
>>>> The Allwinner NMI irqchip driver requires GENERIC_IRQ_CHIP, but
>>>> we can't select it directly, because there is no specific Kconfig entry
>>>> for the driver. Compiling this NMI driver with certain arm64
>>>> configurations thus fails due to the missing dependency:
>>>>
>>>> drivers/built-in.o: In function `sunxi_sc_nmi_set_type':
>>>> drivers/irqchip/irq-sunxi-nmi.c:114: undefined reference to `irq_setup_alt_chip'
>>>> drivers/built-in.o: In function `irq_domain_add_linear':
>>>> include/linux/irqdomain.h:253: undefined reference to `irq_generic_chip_ops'
>>>> include/linux/irqdomain.h:253: undefined reference to `irq_generic_chip_ops'
>>>> drivers/built-in.o: In function `sunxi_sc_nmi_irq_init':
>>>> drivers/irqchip/irq-sunxi-nmi.c:146: undefined reference to `irq_alloc_domain_generic_chips'
>>>> drivers/irqchip/irq-sunxi-nmi.c:161: undefined reference to `irq_get_domain_generic_chip'
>>>> drivers/irqchip/irq-sunxi-nmi.c:170: undefined reference to `irq_gc_mask_clr_bit'
>>>> drivers/irqchip/irq-sunxi-nmi.c:171: undefined reference to `irq_gc_mask_set_bit'
>>>> drivers/irqchip/irq-sunxi-nmi.c:172: undefined reference to `irq_gc_ack_set_bit'
>>>> drivers/irqchip/irq-sunxi-nmi.c:170: undefined reference to `irq_gc_mask_clr_bit'
>>>>
>>>> Add separate Kconfig options for both Allwinner specific irqchip
>>>> drivers and select GENERIC_IRQ_CHIP for the NMI driver.
>>>> The older sun4i IRQ driver only gets selected when support for these
>>>> specific SoCs is compiled, while the NMI driver is selected for all
>>>> Allwinner SoCs (copying the current behaviour and covering future SoCs
>>>> automatically).
>>>>
>>>> Reported-by: Suzuki K Poulose <Suzuki.Poulose@xxxxxxx>
>>>> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
>>>> ---
>>>> Hi,
>>>>
>>>> this is a new approach to the problem that Suzuki tried to address
>>>> already.
>>>> It separates the sun4i IRQ controller driver and the NMI driver as
>>>> Maxime requested.
>>>> While there should be no difference for the NMI driver, the sun4i
>>>> driver now only gets selected for certain SoCs, which is admittedly
>>>> a bold call for -rc5. If people find this too risky, I can bring the
>>>> sun4i in line with the NMI driver (selected for all ARCH_SUNXI) for
>>>> this release and re-create the more selective dependency as a merge
>>>> window patch, so that it gets more testing.
>>>> Please let me know.
>>>>
>>>> Cheers,
>>>> Andre.
>>>>
>>>>  arch/arm/mach-sunxi/Kconfig | 3 ++-
>>>>  drivers/irqchip/Kconfig     | 8 ++++++++
>>>>  drivers/irqchip/Makefile    | 4 ++--
>>>>  3 files changed, 12 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
>>>> index c124d65..c092bc2 100644
>>>> --- a/arch/arm/mach-sunxi/Kconfig
>>>> +++ b/arch/arm/mach-sunxi/Kconfig
>>>> @@ -4,7 +4,6 @@ menuconfig ARCH_SUNXI
>>>>  	select ARCH_REQUIRE_GPIOLIB
>>>>  	select ARCH_HAS_RESET_CONTROLLER
>>>>  	select CLKSRC_MMIO
>>>> -	select GENERIC_IRQ_CHIP
>>>>  	select PINCTRL
>>>>  	select SUN4I_TIMER
>>>>  	select RESET_CONTROLLER
>>>> @@ -14,11 +13,13 @@ if ARCH_SUNXI
>>>>  config MACH_SUN4I
>>>>  	bool "Allwinner A10 (sun4i) SoCs support"
>>>>  	default ARCH_SUNXI
>>>> +	select SUN4I_IRQCHIP
>>>>  
>>>>  config MACH_SUN5I
>>>>  	bool "Allwinner A10s / A13 (sun5i) SoCs support"
>>>>  	default ARCH_SUNXI
>>>>  	select SUN5I_HSTIMER
>>>> +	select SUN4I_IRQCHIP
>>>>  
>>>>  config MACH_SUN6I
>>>>  	bool "Allwinner A31 (sun6i) SoCs support"
>>>> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
>>>> index 3e12479..94f3f42 100644
>>>> --- a/drivers/irqchip/Kconfig
>>>> +++ b/drivers/irqchip/Kconfig
>>>> @@ -165,6 +165,14 @@ config ST_IRQCHIP
>>>>  	help
>>>>  	  Enables SysCfg Controlled IRQs on STi based platforms.
>>>>  
>>>> +config SUN4I_IRQCHIP
>>>> +	bool
>>>> +
>>>> +config SUNXI_NMI
>>>> +	bool "Allwinner SoC NMI controller"
>>>> +	default ARCH_SUNXI
>>>> +	select GENERIC_IRQ_CHIP
>>>
>>> This one is only used on SUN6I, SUN7I and SUN8I. There's no need to
>>> enable it for all the SoCs.
>>
>> But it is enabled for all SoCs at the moment - and as it is actually a
>> fix (-rc1 does not compile for certain arm64 configs) I'd really like to
>> not take chances here.
>> As mentioned I am happy to send a follow up patch to restrict it further
>> - given that it gets more testing, but at the moment I'd really like to
>> just fix the arm64 build without accidentally breaking existing arm(32)
>> boards.
> 
> Then at least be consistent and do the same thing for the A10 irq
> controller too.

Which is basically what Suzuki proposed with v2:
https://lkml.org/lkml/2016/4/13/592

This patch also has been acked by Marc, so can't we just take that for
4.6 and I'll send a patch on top of that to make a more fine grained
selection for the next release?

Cheers,
Andre.