linux-kernel - Re: [PATCH v8 06/21] ARM64 / ACPI: Introduce PCI stub functions for ACPI

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Date:	Tue, 03 Feb 2015 15:55:05 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	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>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	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>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Mark Langsdorf <mlangsdo@...hat.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>,
	Liviu Dudau <Liviu.Dudau@....com>
Subject: Re: [PATCH v8 06/21] ARM64 / ACPI: Introduce PCI stub functions for ACPI

On Tuesday, February 03, 2015 09:30:00 PM Hanjun Guo wrote:
> On 2015年02月03日 20:15, Catalin Marinas wrote:
> > On Mon, Feb 02, 2015 at 12:45:34PM +0000, Hanjun Guo wrote:
> >> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> >> index ce5836c..c17e7ea 100644
> >> --- a/arch/arm64/kernel/pci.c
> >> +++ b/arch/arm64/kernel/pci.c
> >> @@ -10,6 +10,7 @@
> >>    *
> >>    */
> >>
> >> +#include <linux/acpi.h>
> >>   #include <linux/init.h>
> >>   #include <linux/io.h>
> >>   #include <linux/kernel.h>
> >> @@ -68,3 +69,27 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
> >>   	bus->domain_nr = domain;
> >>   }
> >>   #endif
> >> +
> >> +/*
> >> + * raw_pci_read/write - Platform-specific PCI config space access.
> >> + */
> >> +int raw_pci_read(unsigned int domain, unsigned int bus,
> >> +		  unsigned int devfn, int reg, int len, u32 *val)
> >> +{
> >> +	return -EINVAL;
> >> +}
> >> +
> >> +int raw_pci_write(unsigned int domain, unsigned int bus,
> >> +		unsigned int devfn, int reg, int len, u32 val)
> >> +{
> >> +	return -EINVAL;
> >> +}
> >
> > You said you'll make these return -ENOSYS, which I think makes more
> > sense.
> 
> I'm sorry, I missed that, my bad, I will fix that in next version.

Actually, -ENOSYS *specifically* means "not implemented system call".
It should not be used for anything other than that.  -ENXIO is what
should be used instead.


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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