linux-kernel - Re: [PATCH v10 15/21] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL

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Date:	Fri, 20 Mar 2015 14:25:09 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Hanjun Guo <guohanjun@...wei.com>
Cc:	Will Deacon <Will.Deacon@....com>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH v10 15/21] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and
 register device's gsi

On Fri, Mar 20, 2015 at 01:07:12PM +0000, Hanjun Guo wrote:
> On 2015/3/20 3:37, Will Deacon wrote:
> > On Thu, Mar 19, 2015 at 10:12:05AM +0000, Lorenzo Pieralisi wrote:
> >> On Thu, Mar 19, 2015 at 03:45:35AM +0000, Hanjun Guo wrote:
> >>>>> +	if (trigger == ACPI_EDGE_SENSITIVE &&
> >>>>> +				polarity == ACPI_ACTIVE_LOW)
> >>>>> +		irq_type = IRQ_TYPE_EDGE_FALLING;
> >>>>> +	else if (trigger == ACPI_EDGE_SENSITIVE &&
> >>>>> +				polarity == ACPI_ACTIVE_HIGH)
> >>>>> +		irq_type = IRQ_TYPE_EDGE_RISING;
> >>>>> +	else if (trigger == ACPI_LEVEL_SENSITIVE &&
> >>>>> +				polarity == ACPI_ACTIVE_LOW)
> >>>>> +		irq_type = IRQ_TYPE_LEVEL_LOW;
> >>>>> +	else if (trigger == ACPI_LEVEL_SENSITIVE &&
> >>>>> +				polarity == ACPI_ACTIVE_HIGH)
> >>>>> +		irq_type = IRQ_TYPE_LEVEL_HIGH;
> >>>>> +	else
> >>>>> +		irq_type = IRQ_TYPE_NONE;
> >>>>> +
> >>>>> +	/*
> >>>>> +	 * Since only one GIC is supported in ACPI 5.0, we can
> >>>>> +	 * create mapping refer to the default domain
> >>>>> +	 */
> >>>>> +	irq = irq_create_mapping(NULL, gsi);
> >>>>> +	if (!irq)
> >>>>> +		return irq;
> >>>>> +
> >>>>> +	/* Set irq type if specified and different than the current one */
> >>>>> +	if (irq_type != IRQ_TYPE_NONE &&
> >>>>> +		irq_type != irq_get_trigger_type(irq))
> >>>>> +		irq_set_irq_type(irq, irq_type);
> >>>>> +	return irq;
> >>>>> +}
> >>>>> +EXPORT_SYMBOL_GPL(acpi_register_gsi);
> >>>> I see you've still got this buried in the arch code. Is there any plan to
> >>>> move it out, as I moaned about this in the last version of the series and
> >>>> nothing seems to have changed?
> >>> Ah, sorry. Last time when I was in Hongkong for LCA this Feb, I
> >>> discussed with Lorenzo and he had a look into that too, he also met some
> >>> obstacles to do that, so Lorenzo said that he will talk to you about
> >>> this (Lorenzo, correct me if I'm wrong due to hearing problems of much
> >>> noise in that room where we were talking).
> >>>
> >>> Anyway, if we move those functions to core code, such as irqdomain code,
> >>> which will be compiled for x86 too, we can only set those functions as
> >>> _weak, or we guard with them as #ifdef CONFIG_ARM64 ... #endif, so for
> >>> me, it's really not a big deal to move those code out of arch/arm64, but
> >>> I'm still open for suggestions if you can do that in a proper way.
> >> You heard me clear and sound in HK, Will has a point and I looked into
> >> this. Code is generic but not enough to be useful on other arches at
> >> the moment, I need more time to look into this and see if we can move
> >> this code to acpi core in a way that makes sense, to have, as you say,
> >> a "default" implementation.
> > Yeah, just something guarded by a CONFIG option (probably not ARM64
> > though) would be enough, I think. Nothing too fancy.
> Hi Will,
> 
> It is ARM64 related code and ACPI specific, I can come up with following code:
No. It is ACPI code that can be made generic (if it is not already,
apart from GIC specific comments), so IMO it should live in drivers/acpi
and we can introduce a config option for that as we did for S-states and
select it on arm64.

Lorenzo
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