linux-kernel - Re: [RFC part1 PATCH 1/7] ACPI: Make ACPI core running without PCI on ARM64

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Date:	Thu, 5 Dec 2013 23:04:22 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Mark Rutland <mark.rutland@....com>,
	linaro-kernel@...ts.linaro.org,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Al Stone <al.stone@...aro.org>,
	Graeme Gregory <graeme.gregory@...aro.org>, patches@...aro.org,
	Olof Johansson <olof@...om.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
	linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...aro.org>,
	Jon Masters <jonathan@...masters.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [RFC part1 PATCH 1/7] ACPI: Make ACPI core running without PCI on ARM64

On Wednesday 04 December 2013, Hanjun Guo wrote:
> On 2013年12月04日 00:41, Matthew Garrett wrote:
> > Given the number of #ifdefs you're adding, wouldn't it make more sense
> > to just add stub functions to include/linux/pci.h?
> 
> Thanks for the suggestion :)
> 
> I can add stub functions in include/linux/pci.h for raw_pci_read()/
> raw_pci_write(), then can remove #ifdefs for acpi_os_read/write_pci_configuration().

Actually I wonder about the usefulness of this patch in either form: Since ACPI
on ARM64 is only for servers, I would very much expect them to always come with
PCI, either physical host bridges with attached devices, or logical PCI functions
used to describe the on-SoC I/O devices. Even in case of virtual machines, you'd
normally use PCI as the method to communicate data about the virtio channels.

Can you name a realistic use-case where you'd want ACPI but not PCI?

	Arnd
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