linux-kernel - Re: [PATCH v5 07/17] ACPI: bus: Add RINTC IRQ model for RISC-V

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Message-ID: <ZlQNqiWXNpv30AGp@sunil-laptop>
Date: Mon, 27 May 2024 10:05:54 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-serial@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Anup Patel <anup@...infault.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Robert Moore <robert.moore@...el.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Marc Zyngier <maz@...nel.org>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Andrei Warkentin <andrei.warkentin@...el.com>,
	Haibo1 Xu <haibo1.xu@...el.com>,
	Björn Töpel <bjorn@...nel.org>
Subject: Re: [PATCH v5 07/17] ACPI: bus: Add RINTC IRQ model for RISC-V

On Thu, May 23, 2024 at 04:59:03PM -0500, Bjorn Helgaas wrote:
> On Wed, May 01, 2024 at 05:47:32PM +0530, Sunil V L wrote:
> > Add the IRQ model for RISC-V INTC so that acpi_set_irq_model can use this
> > for RISC-V.
> > 
> > Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> > ---
> >  drivers/acpi/bus.c   | 3 +++
> >  include/linux/acpi.h | 1 +
> >  2 files changed, 4 insertions(+)
> > 
> > diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> > index 17ee483c3bf4..6739db258a95 100644
> > --- a/drivers/acpi/bus.c
> > +++ b/drivers/acpi/bus.c
> > @@ -1190,6 +1190,9 @@ static int __init acpi_bus_init_irq(void)
> >  	case ACPI_IRQ_MODEL_LPIC:
> >  		message = "LPIC";
> >  		break;
> > +	case ACPI_IRQ_MODEL_RINTC:
> > +		message = "RINTC";
> > +		break;
> >  	default:
> >  		pr_info("Unknown interrupt routing model\n");
> >  		return -ENODEV;
> > diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> > index 846a4001b5e0..c1a01fd02873 100644
> > --- a/include/linux/acpi.h
> > +++ b/include/linux/acpi.h
> > @@ -107,6 +107,7 @@ enum acpi_irq_model_id {
> >  	ACPI_IRQ_MODEL_PLATFORM,
> >  	ACPI_IRQ_MODEL_GIC,
> >  	ACPI_IRQ_MODEL_LPIC,
> > +	ACPI_IRQ_MODEL_RINTC,
> 
> Is the ACPI_IRQ_MODEL_RINTC value documented somewhere?  Maybe an ECR
> for the ACPI spec?
> 
> acpi_bus_init_irq() is going to pass ACPI_IRQ_MODEL_RINTC to _PIC, and
> ACPI r6.5, sec 5.8.1 only mentions the ACPI_IRQ_MODEL_PIC,
> ACPI_IRQ_MODEL_IOAPIC, and ACPI_IRQ_MODEL_IOSAPIC values.
> 
> Even the existing ACPI_IRQ_MODEL_PLATFORM, ACPI_IRQ_MODEL_GIC, and
> ACPI_IRQ_MODEL_LPIC values aren't mentioned in ACPI r6.5.
> 
Yeah, I also noticed it. I don't know the history behind this. Rafael or
someone else might have better knowledge. IMO, it is better to update
ACPI spec _PIC with all these values. If I don't see any objections, I
will raise an ECR to update the spec.

Thanks,
Sunl