linux-kernel - Re: [PATCH 06/20] ARM64 / ACPI: Introduce some PCI functions when PCI is enabled

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Date:	Mon, 20 Jan 2014 09:20:49 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linaro-kernel@...ts.linaro.org
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rob Herring <robh@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Olof Johansson <olof@...om.net>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	linux-acpi@...r.kernel.org, patches@...aro.org,
	Grant Likely <grant.likely@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org, Charles.Garcia-Tobin@....com
Subject: Re: [PATCH 06/20] ARM64 / ACPI: Introduce some PCI functions when PCI is enabled

On Monday 20 January 2014 16:08:01 Hanjun Guo wrote:
> >> diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
> >> index 3c8521d..1835b21 100644
> >> --- a/drivers/acpi/plat/arm-core.c
> >> +++ b/drivers/acpi/plat/arm-core.c
> >> @@ -100,6 +100,25 @@ int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
> >>  }
> >>  EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
> >>  
> >> +int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
> >> +{
> >> +    return -1;
> >> +}
> >> +
> >> +int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
> >> +{
> >> +    /* TBD */
> >> +    return -EINVAL;
> >> +}
> >> +EXPORT_SYMBOL(acpi_register_ioapic);
> >> +
> >> +int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
> >> +{
> >> +    /* TBD */
> >> +    return -EINVAL;
> >> +}
> >> +EXPORT_SYMBOL(acpi_unregister_ioapic);
> >> +
> > 
> > My feeling is that these are better handled in the ACPI code by not
> > calling them on architectures that have no ISA or no IOAPIC support.
> > 
> > We have configuration symbols for both, so you don't have to make
> > it depend on CONFIG_ARM64 or CONFIG_X86.
> 
> Do you mean introduce a stub function when there is no ISA support?

Do you anticipate ISA devices on ARM64? I hope not ;-)

My guess is that whatever code calls this function should be disabled
in reduced hw mode.

> acpi_register_ioapic()/acpi_unregister_ioapic() will be used for IOAPIC
> hotplug and GIC distributor is something like IOAPIC on x86, so I think
> these two functions can be reserved for future use.

But GIC is not hotplugged, is it? It still sounds x86 specific to me.

	Arnd
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