linux-kernel - Re: [PATCH 2/3] efi/reboot: Allow powering off machines using EFI

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Message-ID: <1403558424.755.58.camel@deneb.redhat.com>
Date:	Mon, 23 Jun 2014 17:20:24 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Aubrey Li <aubrey.li@...ux.intel.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 2/3] efi/reboot: Allow powering off machines using EFI

On Thu, 2014-06-19 at 14:40 +0100, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@...el.com>
> 
> Not only can EfiResetSystem() be used to reboot, it can also be used to
> power down machines.
> 
> By and large, this functionality doesn't work very well across the range
> of EFI machines in the wild, so it should definitely only be used as a
> last resort. In an ideal world, this wouldn't be needed at all.
> 
> Unfortunately, we're starting to see machines where EFI is the *only*
> reliable way to power down, and nothing else, not PCI, not ACPI, works.
> 
> efi_poweroff_required() should be implemented on a per-architecture
> basis, since exactly when we should be using EFI runtime services is a
> platform-specific decision. There's no analogue for reboot because each
> architecture handles reboot very differently - the x86 code in
> particular is pretty complex.
> 
> Patches to enable this for specific classes of hardware will be
> submitted separately.
> 
> Cc: Mark Salter <msalter@...hat.com>
> Signed-off-by: Matt Fleming <matt.fleming@...el.com>
> ---

Tested-by: Mark Salter <msalter@...hat.com>


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