linux-kernel - Re: [PATCH v7 13/17] ARM64 / ACPI: Add GICv2 specific ACPI boot support

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Message-ID: <20150129152922.GG8951@e104818-lin.cambridge.arm.com>
Date:	Thu, 29 Jan 2015 15:29:23 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	Marc Zyngier <Marc.Zyngier@....com>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	Will Deacon <Will.Deacon@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	Timur Tabi <timur@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"wangyijing@...wei.com" <wangyijing@...wei.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>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH v7 13/17] ARM64 / ACPI: Add GICv2 specific ACPI boot
 support

On Tue, Jan 27, 2015 at 04:12:08PM +0000, Grant Likely wrote:
> On Fri, Jan 16, 2015 at 2:37 PM, Marc Zyngier <marc.zyngier@....com> wrote:
> >>>> @@ -78,6 +79,10 @@ void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
> >>>>  void __init init_IRQ(void)
> >>>>  {
> >>>>     irqchip_init();
> >>>> +
> >>>> +   if (!handle_arch_irq)
> >>>> +           acpi_gic_init();
> >>>> +
> >>>
> >>> Why isn't this called from irqchip_init? It would seem like the logical
> >>> spot to probe an interrupt controller.
> >>
> >> What has been done here isn't an unusual choice. We've got stuff all
> >> over the kernel that may or may not be implemented depending on what
> >> the architecture supports. If the function call is renamed to
> >> acpi_init_irq(), are you content?
> >
> > My (full) suggestion was to do it like we've done it for DT, and I don't
> > think I varied much from this point of view. Yes, calling it
> > acpi_irq_init() would be a good start, and having the ACPI-compatible
> > irqchips to be self-probable even better.
> >
> > <lack-of-sleep-rant>
> >
> > Hell, if nobody beats me to it, maybe I'll just write that code, with
> > proper entry points in the various GIC drivers. Yes, this is
> > infrastructure. Maybe it is grossly overdesigned. But I really spend too
> > much time dealing with the crap that people are happy to pile on top of
> > the GIC code to be madly enthusiastic about the general "good enough"
> > attitude.
> >
> > </lack-of-sleep-rant>
> >
> > Or to put it in a slightly more diplomatic way: If ACPI is to be our
> > future, can we please make the future look a bit better?
> 
> Hi Marc,
> 
> As per our off-list discussion, I completely agree. We don't want to
> be adding hack upon hack, and I will be first in line to NAK any
> patches taking that approach. However, for this initial series, it
> only supports exactly one GIC that can be set up by ACPI. Can we agree
> to leave it as is in this series, with the agreement that it will be
> replaced for v2m and v3 support with a proper pluggable initializer?

Can we at least call it acpi_init_irq() and avoid #including
gic-specific header files? IOW hide the apci_gic_init() behind some
generically named macro until the full solution is in place.

-- 
Catalin
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