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

From: Ben Guthro
Date: Mon Jul 29 2013 - 13:15:10 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 | 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@xxxxxxxxxxxxxxxxxxxxx mailing list.");
+ return -1;
+}
+
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;
}

--
1.7.9.5

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