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

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Date:	Mon, 29 Jul 2013 16:18:22 -0400
From:	Ben Guthro <Benjamin.Guthro@...rix.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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)




> 
>> +}
>> +
>>  static atomic_t ap_wfs_count;
>>  
>>  static int tboot_wait_for_aps(int num_aps)
>> @@ -422,6 +433,7 @@ 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;
>>  }
> 
> Thanks,
> Rafael
> 
> 
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