linux-kernel - Re: [PATCH v7 2/3] x86/tboot: Fail extended mode reduced hardware sleep

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Message-ID: <1982892.4uOzLBL3Sx@vostro.rjw.lan>
Date:	Mon, 29 Jul 2013 22:29:48 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ben Guthro <Benjamin.Guthro@...rix.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jan Beulich <jbeulich@...e.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, xen-devel@...ts.xen.org,
	tboot-devel@...ts.sourceforge.net, Gang Wei <gang.wei@...el.com>
Subject: Re: [PATCH v7 2/3] x86/tboot: Fail extended mode reduced hardware sleep

On Monday, July 29, 2013 04:18:22 PM Ben Guthro wrote:
> 
> On 07/29/2013 04:21 PM, Rafael J. Wysocki wrote:
> > On Monday, July 29, 2013 01:14:14 PM Ben Guthro wrote:
> >> Register for the extended sleep callback from acpi.
> >> As tboot currently does not support the reduced hardware sleep
> >> interface, fail this extended call.
> >>
> >> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> >> Signed-off-by: Ben Guthro <benjamin.guthro@...rix.com>
> >> Cc: tboot-devel@...ts.sourceforge.net
> >> Cc: Gang Wei <gang.wei@...el.com>
> >> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> >> ---
> >>  arch/x86/kernel/tboot.c |   12 ++++++++++++
> >>  1 file changed, 12 insertions(+)
> >>
> >> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
> >> index addf7b5..760f431 100644
> >> --- a/arch/x86/kernel/tboot.c
> >> +++ b/arch/x86/kernel/tboot.c
> >> @@ -301,6 +301,17 @@ static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
> >>  	return 0;
> >>  }
> >>  
> >> +static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b)
> >> +{
> >> +	if (!tboot_enabled())
> >> +		return 0;
> >> +
> >> +	pr_warning("tboot is not able to suspend on platforms with"
> >> +		   " reduced hardware sleep (ACPIv5). Please contact"
> >> +		   " tboot-devel@...ts.sourceforge.net mailing list.");
> >> +	return -1;
> > 
> > Please use a meaningful error code here.  For example -ENODEV.
> 
> Would AE_NOT_IMPLEMENTED be more appropriate?
> 
> include/acpi/acexcep.h:
> #define AE_NOT_IMPLEMENTED              EXCEP_ENV (0x000E)

This is not an ACPI error. :-)

Rafael

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