From patchwork Thu Sep 29 07:05:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 12993579 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF018C07E9D for ; Thu, 29 Sep 2022 07:06:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235099AbiI2HGO (ORCPT ); Thu, 29 Sep 2022 03:06:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234942AbiI2HFn (ORCPT ); Thu, 29 Sep 2022 03:05:43 -0400 Received: from smtp-relay-canonical-0.canonical.com (smtp-relay-canonical-0.canonical.com [185.125.188.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D09CE7A741; Thu, 29 Sep 2022 00:05:39 -0700 (PDT) Received: from ubuntu.. (1-171-217-173.dynamic-ip.hinet.net [1.171.217.173]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-0.canonical.com (Postfix) with ESMTPSA id 7F7A33F13C; Thu, 29 Sep 2022 07:05:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1664435137; bh=EIO8RLHRUqUOMVMnjKNUomp/uVQ7oSnUxK82AjAnxrI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=AzFkMiPG+l36uw459ut5KyH8qgBbKG9/LRE7GD6LaRWambFndjiJuQuWvnij3PLIX 2embg4g/3uz+Wq96VvpRJzSfgvouD6ldxqSBxmFKV/57/zusJiMyuN0H8miPslnfKl p9gEdQn2cvrfb5gAJybr0QNace5WW4lyQm+0tgq1ZhUSaCz05RhQ4W1TpJz18rZV7Z epqEtIsNZeZOhiJ2pcj88hW2G9YUPwb/b7gpfmfhqB17NRb7bTPUD3J80lbnv7uM1F STvrTVgYOpwLfj+5aycRlEGkv0/OhR/vobTAYXM3pndt7/iyUoma7NvpFIPpp3NS++ m4+XisZ2YFLgw== From: Kai-Heng Feng To: rafael.j.wysocki@intel.com, lenb@kernel.org Cc: linux-acpi@vger.kernel.org, Kai-Heng Feng , Dmitry Osipenko , tangmeng , Luis Chamberlain , Petr Mladek , YueHaibing , linux-kernel@vger.kernel.org Subject: [RESEND PATCH v4 1/2] kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode Date: Thu, 29 Sep 2022 15:05:23 +0800 Message-Id: <20220929070526.143907-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add SYS_OFF_MODE_RESTART_PREPARE callbacks can be invoked before system restart. This is a preparation for next patch. Suggested-by: Dmitry Osipenko Reviewed-by: Dmitry Osipenko Signed-off-by: Kai-Heng Feng --- v4: - Correct typo in comment. v3: - New patch. include/linux/reboot.h | 8 ++++++++ kernel/reboot.c | 17 +++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/linux/reboot.h b/include/linux/reboot.h index e5d9ef886179c..2b6bb593be5b6 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -105,6 +105,14 @@ enum sys_off_mode { */ SYS_OFF_MODE_POWER_OFF, + /** + * @SYS_OFF_MODE_RESTART_PREPARE: + * + * Handlers prepare system to be restarted. Handlers are + * allowed to sleep. + */ + SYS_OFF_MODE_RESTART_PREPARE, + /** * @SYS_OFF_MODE_RESTART: * diff --git a/kernel/reboot.c b/kernel/reboot.c index 3c35445bf5ad3..3bba88c7ffc6b 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -243,6 +243,17 @@ void migrate_to_reboot_cpu(void) set_cpus_allowed_ptr(current, cpumask_of(cpu)); } +/* + * Notifier list for kernel code which wants to be called + * to prepare system for restart. + */ +static BLOCKING_NOTIFIER_HEAD(restart_prep_handler_list); + +static void do_kernel_restart_prepare(void) +{ + blocking_notifier_call_chain(&restart_prep_handler_list, 0, NULL); +} + /** * kernel_restart - reboot the system * @cmd: pointer to buffer containing command to execute for restart @@ -254,6 +265,7 @@ void migrate_to_reboot_cpu(void) void kernel_restart(char *cmd) { kernel_restart_prepare(cmd); + do_kernel_restart_prepare(); migrate_to_reboot_cpu(); syscore_shutdown(); if (!cmd) @@ -396,6 +408,11 @@ register_sys_off_handler(enum sys_off_mode mode, handler->list = &power_off_handler_list; break; + case SYS_OFF_MODE_RESTART_PREPARE: + handler->list = &restart_prep_handler_list; + handler->blocking = true; + break; + case SYS_OFF_MODE_RESTART: handler->list = &restart_handler_list; break;