linux-kernel - RE: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full platforms without

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Date:	Wed, 16 Mar 2016 05:59:29 +0000
From:	"Chen, Yu C" <yu.c.chen@...el.com>
To:	Matt Fleming <matt@...eblueprint.co.uk>
CC:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Mark Salter <msalter@...hat.com>
Subject: RE: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full
 platforms without _S5

Hi Matt,

> -----Original Message-----
> From: Matt Fleming [mailto:matt@...eblueprint.co.uk]
> Sent: Tuesday, March 15, 2016 4:01 AM
> To: Chen, Yu C
> Cc: linux-acpi@...r.kernel.org; linux-pm@...r.kernel.org; Rafael J. Wysocki;
> Len Brown; Thomas Gleixner; Ingo Molnar; H. Peter Anvin; Zhang, Rui; linux-
> efi@...r.kernel.org; x86@...nel.org; linux-kernel@...r.kernel.org; Ard
> Biesheuvel; Mark Salter
> Subject: Re: [PATCH][RFC,v4] ACPI / PM: Introduce efi poweroff for HW-full
> platforms without _S5
> 
> On Fri, 11 Mar, at 04:33:46PM, Chen, Yu C wrote:
> >
> > There is  a future Base-IA platform, we are planning to skip
> > implementing the SLP_TYP register and the S5 object.  (already there
> > will be no S3 and no S4)
> 
> Cool. This is really valuable information that should go into the commit
> message.
> 
> Because if this is the rationale for the change, I don't see why we'd need to
> provide the default stuff. Instead we should just enforce EFI reboot, and
> only add the pm_poweroff_default hook if there is an explicit user in the
> future, IMO.

Do you mean the patch v3 make sense
https://patchwork.kernel.org/patch/8514751/
and we should use efi power off as our first choice, if there is no _S5  available(no acpi_power_off),
even there is a customized  poweroff(driver provided, eg)? 

Meanwhile, the legacy platforms will not be affected because
there is no path to overwrite pm_power_off to efi power off.

thanks,
yu