linux-kernel - Re: [PATCH v2 05/17] irqchip: Convert all alloc/xlate users from of

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Date:	Wed, 14 Oct 2015 17:37:55 +0200
From:	Tomasz Nowicki <tomasz.nowicki@...aro.org>
To:	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>,
	Jake Oshins <jakeo@...rosoft.com>
Subject: Re: [PATCH v2 05/17] irqchip: Convert all alloc/xlate users from
 of_node to fwnode

On 14.10.2015 17:31, Marc Zyngier wrote:
> On 14/10/15 16:26, Tomasz Nowicki wrote:
>> Hi Marc,
>>
>> On 13.10.2015 13:51, Marc Zyngier wrote:
>>> Since we now have a generic data structure to express an
>>> interrupt specifier, convert all hierarchical irqchips that
>>> are OF based to use a fwnode_handle as part of their alloc
>>> and xlate (which becomes translate) callbacks.
>>>
>>> As most of these drivers have dependencies (they exchange IRQ
>>> specifiers), change them all in a single, massive patch...
>>>
>>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>>> ---
>>>    arch/arm/mach-exynos/suspend.c       | 55 ++++++++++++++++---------------
>>>    arch/arm/mach-imx/gpc.c              | 55 ++++++++++++++++---------------
>>>    arch/arm/mach-omap2/omap-wakeupgen.c | 55 ++++++++++++++++---------------
>>>    drivers/irqchip/irq-crossbar.c       | 62 ++++++++++++++++++----------------
>>>    drivers/irqchip/irq-gic-v2m.c        | 18 ++++++----
>>>    drivers/irqchip/irq-gic-v3-its.c     | 20 ++++++-----
>>>    drivers/irqchip/irq-gic-v3.c         | 49 +++++++++++++--------------
>>>    drivers/irqchip/irq-gic.c            | 33 ++++++++++++++++---
>>>    drivers/irqchip/irq-imx-gpcv2.c      | 64 ++++++++++++++++--------------------
>>>    drivers/irqchip/irq-mtk-sysirq.c     | 49 ++++++++++++++-------------
>>>    drivers/irqchip/irq-nvic.c           | 18 +++++++---
>>>    drivers/irqchip/irq-tegra.c          | 55 ++++++++++++++++---------------
>>>    drivers/irqchip/irq-vf610-mscm-ir.c  | 42 +++++++++++++++--------
>>>    13 files changed, 323 insertions(+), 252 deletions(-)
>>>
>>
>> [...]
>>
>>>
>>>    static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
>>> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
>>> index 5793880..05d010b 100644
>>> --- a/drivers/irqchip/irq-gic-v3.c
>>> +++ b/drivers/irqchip/irq-gic-v3.c
>>> @@ -737,32 +737,30 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>>>    	return 0;
>>>    }
>>>
>>> -static int gic_irq_domain_xlate(struct irq_domain *d,
>>> -				struct device_node *controller,
>>> -				const u32 *intspec, unsigned int intsize,
>>> -				unsigned long *out_hwirq, unsigned int *out_type)
>>> +static int gic_irq_domain_translate(struct irq_domain *d,
>>> +				    struct irq_fwspec *fwspec,
>>> +				    unsigned long *hwirq,
>>> +				    unsigned int *type)
>>>    {
>>> -	if (irq_domain_get_of_node(d) != controller)
>>> -		return -EINVAL;
>>> -	if (intsize < 3)
>>> -		return -EINVAL;
>>> +	if (is_of_node(fwspec->fwnode)) {
>>> +		if (fwspec->param_count < 3)
>>> +			return -EINVAL;
>>>
>>> -	switch(intspec[0]) {
>>> -	case 0:			/* SPI */
>>> -		*out_hwirq = intspec[1] + 32;
>>> -		break;
>>> -	case 1:			/* PPI */
>>> -		*out_hwirq = intspec[1] + 16;
>>> -		break;
>>> -	case GIC_IRQ_TYPE_LPI:	/* LPI */
>>> -		*out_hwirq = intspec[1];
>>> -		break;
>>> -	default:
>>> -		return -EINVAL;
>>> +		/* Get the interrupt number and add 16 to skip over SGIs */
>>> +		*hwirq = fwspec->param[1] + 16;
>>> +
>>> +		/*
>>> +		 * For SPIs, we need to add 16 more to get the GIC irq
>>> +		 * ID number
>>> +		 */
>>> +		if (!fwspec->param[0])
>>> +			*hwirq += 16;
>>> +
>>> +		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
>>> +		return 0;
>>>    	}
>>>
>>> -	*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
>>> -	return 0;
>>> +	return -EINVAL;
>>>    }
>>
>> What about GIC_IRQ_TYPE_LPI type? Previously we leaved interrupt line nr
>> and now +32.
>
> Please see the patch I've posted earlier that address this particular issue:
>
> https://lkml.org/lkml/2015/10/14/272
>

Makes sense, thanks.

Tomasz
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