linux-kernel - Re: [PATCH v1] irqchip: loongson-liointc: add hierarchy irq support

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Message-ID: <cfbfe5c1-2dbb-a057-b56c-13900ba8c953@loongson.cn>
Date:   Wed, 7 Dec 2022 18:50:56 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhuyinbo@...ngson.cn
Subject: Re: [PATCH v1] irqchip: loongson-liointc: add hierarchy irq support


在 2022/12/7 16:08, Marc Zyngier 写道:
> On Wed, 07 Dec 2022 01:45:55 +0000,
> Yinbo Zhu <zhuyinbo@...ngson.cn> wrote:
>> When the irq of hierarchical interrupt chip was routed to liointc
>> that asked liointc driver to support hierarchy irq and this patch
>> was to add such support.
>>
>> In addition, this patch only consider dts, and acpi hierarchy irq
>> support will be added later as required.
>>
>> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
>> ---
>>   drivers/irqchip/irq-loongson-liointc.c | 31 ++++++++++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>
>> diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c
>> index 0da8716f8f24..58e43a2cd02e 100644
>> --- a/drivers/irqchip/irq-loongson-liointc.c
>> +++ b/drivers/irqchip/irq-loongson-liointc.c
>> @@ -177,6 +177,32 @@ static const struct irq_domain_ops acpi_irq_gc_ops = {
>>   	.xlate	= liointc_domain_xlate,
>>   };
>>   
>> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
>> +static int liointc_domain_alloc(struct irq_domain *domain, unsigned int virq,
>> +				unsigned int nr_irqs, void *arg)
>> +{
>> +	int i, ret;
>> +	irq_hw_number_t hwirq;
>> +	unsigned int type = IRQ_TYPE_NONE;
>> +	struct irq_fwspec *fwspec = arg;
>> +
>> +	ret = irq_domain_translate_twocell(domain, fwspec, &hwirq, &type);
>> +	if (ret)
>> +		return ret;
>> +
>> +	for (i = 0; i < nr_irqs; i++)
>> +		irq_map_generic_chip(domain, virq + i, hwirq + i);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct irq_domain_ops of_irq_gc_ops = {
>> +	.translate	= irq_domain_translate_twocell,
>> +	.alloc		= liointc_domain_alloc,
>> +	.free		= irq_domain_free_irqs_top,
>> +};
>> +#endif
>> +
>>   static int liointc_init(phys_addr_t addr, unsigned long size, int revision,
>>   		struct fwnode_handle *domain_handle, struct device_node *node)
>>   {
>> @@ -218,8 +244,13 @@ static int liointc_init(phys_addr_t addr, unsigned long size, int revision,
>>   		domain = irq_domain_create_linear(domain_handle, LIOINTC_CHIP_IRQ,
>>   					&acpi_irq_gc_ops, priv);
>>   	else
>> +#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
>> +		domain = irq_domain_create_linear(domain_handle, LIOINTC_CHIP_IRQ,
>> +					&of_irq_gc_ops, priv);
>> +#else
>>   		domain = irq_domain_create_linear(domain_handle, LIOINTC_CHIP_IRQ,
>>   					&irq_generic_chip_ops, priv);
>> +#endif
> Two things:
>
> - Why do we need three calls to create the same domains depending on
>    what firmware is used and kernel configuration?
yes, It depend on firmeware and kernel configuration.
>
> - who is going to decide whether to select the
>    CONFIG_IRQ_DOMAIN_HIERARCHY option?
The latest gpio driver will select  CONFIG_IRQ_DOMAIN_HIERARCHY
>
> I'd really like to see a statement from the Loongson folks about what
> this whole DT stuff is all about. AFAICT, the core ACPICA stuff isn't
> even fully merged (i.e. we still rely on arch-specific hacks).

The support of dts is mainly for Loongson embedded chips, such as 
LoongArch Loongson-2

series SoC.  and it use dts to descripte device and don't support acpi.

>
> Can you *please* finish what you've started before adding another
> layer of quality stuff on top?
>
> 	M.
>