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

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Message-ID: <1375190557-21474-1-git-send-email-benjamin.guthro@citrix.com>
Date:	Tue, 30 Jul 2013 09:22:37 -0400
From:	Ben Guthro <benjamin.guthro@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jan Beulich <jbeulich@...e.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, <linux-kernel@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <xen-devel@...ts.xen.org>
CC:	Ben Guthro <benjamin.guthro@...rix.com>,
	<tboot-devel@...ts.sourceforge.net>, Gang Wei <gang.wei@...el.com>
Subject: [PATCH v8.1] x86/tboot: Fail extended mode reduced hardware sleep

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 |   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;
 }
 
-- 
1.7.9.5

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