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

[Mark Salter]

On Thu, 2014-06-19 at 14:40 +0100, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@xxxxxxxxx>
> 
> 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@xxxxxxxxxx>
> Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
> ---

Tested-by: Mark Salter <msalter@xxxxxxxxxx>


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