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

From: Ben Guthro
Date: Tue Jul 30 2013 - 09:23:04 EST

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@xxxxxxxx>
Signed-off-by: Ben Guthro <benjamin.guthro@xxxxxxxxxx>
Cc: tboot-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Gang Wei <gang.wei@xxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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)

+ acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep);
return 0;


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