From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756172AbcGGGd6 (ORCPT ); Thu, 7 Jul 2016 02:33:58 -0400 Received: from mga02.intel.com ([134.134.136.20]:33100 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750812AbcGGGd5 (ORCPT ); Thu, 7 Jul 2016 02:33:57 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,323,1464678000"; d="scan'208";a="1012294149" From: Chen Yu To: linux-pm@vger.kernel.org Cc: "Rafael J. Wysocki" , Pavel Machek , Len Brown , linux-kernel@vger.kernel.org, Chen Yu Subject: [PATCH] PM / hibernate: Introduce snapshot test mode for hibernation Date: Thu, 7 Jul 2016 14:40:58 +0800 Message-Id: <1467873658-31986-1-git-send-email-yu.c.chen@intel.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This mode is to verify if the snapshot data written to swap device can be successfully restored to memory. It is useful to ease the debugging process on hibernation, since this mode can not only bypass the BIOSen/bootloader, but also the system re-initialization. For example: $ sudo echo snapshot > /sys/power/disk $ sudo echo disk > /sys/power/state /* manual resume.*/ $ sudo echo 8:3 > /sys/power/resume Signed-off-by: Chen Yu --- kernel/power/hibernate.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index fca9254..667d926 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -52,6 +52,7 @@ enum { #ifdef CONFIG_SUSPEND HIBERNATION_SUSPEND, #endif + HIBERNATION_SNAPSHOT, /* keep last */ __HIBERNATION_AFTER_LAST }; @@ -631,6 +632,9 @@ static void power_down(void) "Try swapon -a.\n"); return; #endif + case HIBERNATION_SNAPSHOT: + /* Do nothing. */ + return; } kernel_halt(); /* @@ -878,6 +882,7 @@ static const char * const hibernation_modes[] = { #ifdef CONFIG_SUSPEND [HIBERNATION_SUSPEND] = "suspend", #endif + [HIBERNATION_SNAPSHOT] = "snapshot", }; /* @@ -924,6 +929,7 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, #ifdef CONFIG_SUSPEND case HIBERNATION_SUSPEND: #endif + case HIBERNATION_SNAPSHOT: break; case HIBERNATION_PLATFORM: if (hibernation_ops) @@ -970,6 +976,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, #ifdef CONFIG_SUSPEND case HIBERNATION_SUSPEND: #endif + case HIBERNATION_SNAPSHOT: hibernation_mode = mode; break; case HIBERNATION_PLATFORM: -- 2.7.4