linux-kernel - Re: [PATCH v8.1] x86/tboot: Fail extended mode reduced hardware sleep

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Date:	Tue, 30 Jul 2013 15:34:23 +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 v8.1] x86/tboot: Fail extended mode reduced hardware sleep

On Tuesday, July 30, 2013 09:22:37 AM 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>

Looks OK, thanks!

I'll queue up the patchset for 3.12.

Thanks,
Rafael


> ---
>  arch/x86/kernel/tboot.c |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
> index addf7b5..91a4496 100644
> --- a/arch/x86/kernel/tboot.c
> +++ b/arch/x86/kernel/tboot.c
> @@ -301,6 +301,15 @@ 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)");
> +	return -ENODEV;
> +}
> +
>  static atomic_t ap_wfs_count;
>  
>  static int tboot_wait_for_aps(int num_aps)
> @@ -422,6 +431,7 @@ static __init int tboot_late_init(void)
>  #endif
>  
>  	acpi_os_set_prepare_sleep(&tboot_sleep);
> +	acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep);
>  	return 0;
>  }
>  
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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