From nobody Mon Feb 9 04:03:39 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=none dis=none) header.from=collabora.com ARC-Seal: i=1; a=rsa-sha256; t=1652139236; cv=none; d=zohomail.com; s=zohoarc; b=QZMeYHbqr/jxsgR3rGK1SDuuw6RNmcew0pfPHZs8NP26AFjOUGFamAnwgLuhoHOUjvm+v+b4T5mfvHCBEsgdi9giWtZSX4OpjMdNd8PKd/3zH20Bcugo+8Ye+20oDUrCzNwbONvOd2w1E01YMJSkD4MrhH5SGv9JeNMQVmADdMY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1652139236; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=HZfwGNUgUN0tCmtv/f9bBaX9FbLIQovod4A33/meY9Q=; b=QQhMeQAQYeFQV31QnN7LHm1zBBeImphDO8N435i07qBTir8myqvBI6Xt9jyPgP8qOxRMcTp2Aogu6xSMvr/dB/8F1HKDKtdsc3mwd8+el3RgYkw4SUMd9TiIGtrOdjsjZcssa6u4t3rotqcNZN+kgdbSe6CiERQysHTDYk+9Q+A= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 16521392364101005.3810447735889; Mon, 9 May 2022 16:33:56 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.324891.547241 (Exim 4.92) (envelope-from ) id 1noCsj-0002ND-0C; Mon, 09 May 2022 23:33:37 +0000 Received: by outflank-mailman (output) from mailman id 324891.547241; Mon, 09 May 2022 23:33:36 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1noCsi-0002N0-Sq; Mon, 09 May 2022 23:33:36 +0000 Received: by outflank-mailman (input) for mailman id 324891; Mon, 09 May 2022 23:33:35 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1noCsh-0007Pf-Ho for xen-devel@lists.xenproject.org; Mon, 09 May 2022 23:33:35 +0000 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 7192045c-cff0-11ec-8fc4-03012f2f19d4; Tue, 10 May 2022 01:33:34 +0200 (CEST) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: dmitry.osipenko) with ESMTPSA id C21B61F430BF X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 7192045c-cff0-11ec-8fc4-03012f2f19d4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1652139214; bh=hTMdSPi0zN4MGEkpm7fbCDxWpGgYrC/cc+PuY565mHY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Sk8pDCwXSAwTQ9cVTZlPz8a8ySrGY3hGrPt+VGDskV6R+uCOw9LADMc/JKfeftNPo asFxJcHbxHiK/3w91N3jvIgWMJgwCq+N4MlCfsgguAazqG3J0kdIxL0enJF0AIFfvB qrj4DZBOnMGXRehw13w/Gqu1lXja85Nu7DH8kFwOkMscD0FBV8ggmpXlUuebyAbpd6 13JtTCF+jbP9cTENV6T22N6ht/UOp/jY7vlhjRhQskgAm5LbyaAdU+aqJl1oWzNotR zhh4iJ4DmsyzvGmL9Z1V2DZh2YCAdFZhUlWdl4dlLp7iND0uYa6NncprgcDCwwXRCN BwArMJ/2esCeg== From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Russell King , Catalin Marinas , Will Deacon , Guo Ren , Geert Uytterhoeven , Greg Ungerer , Joshua Thompson , Thomas Bogendoerfer , Sebastian Reichel , Linus Walleij , Philipp Zabel , Greentime Hu , Vincent Chen , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Yoshinori Sato , Rich Felker , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , "Rafael J. Wysocki" , Len Brown , Santosh Shilimkar , Krzysztof Kozlowski , Liam Girdwood , Mark Brown , Pavel Machek , Lee Jones , Andrew Morton , Guenter Roeck , Daniel Lezcano , Andy Shevchenko , Ulf Hansson , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= Cc: linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org Subject: [PATCH v8 08/27] kernel/reboot: Add register_platform_power_off() Date: Tue, 10 May 2022 02:32:16 +0300 Message-Id: <20220509233235.995021-9-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220509233235.995021-1-dmitry.osipenko@collabora.com> References: <20220509233235.995021-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @collabora.com) X-ZM-MESSAGEID: 1652139237349100001 Content-Type: text/plain; charset="utf-8" Add platform-level registration helpers that will ease transition of the arch/platform power-off callbacks to the new sys-off based API, allowing us to remove the global pm_power_off variable in the future. Signed-off-by: Dmitry Osipenko --- include/linux/reboot.h | 3 +++ kernel/reboot.c | 55 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/include/linux/reboot.h b/include/linux/reboot.h index c52f77ee4ddd..f185b64faae0 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -141,6 +141,9 @@ int devm_register_sys_off_handler(struct device *dev, int (*callback)(struct sys_off_data *data), void *cb_data); =20 +int register_platform_power_off(void (*power_off)(void)); +void unregister_platform_power_off(void (*power_off)(void)); + /* * Architecture independent implemenations of sys_reboot commands. */ diff --git a/kernel/reboot.c b/kernel/reboot.c index 982e58c11ce8..e74103f2a801 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -469,6 +469,61 @@ int devm_register_sys_off_handler(struct device *dev, } EXPORT_SYMBOL_GPL(devm_register_sys_off_handler); =20 +static struct sys_off_handler *platform_power_off_handler; + +static int platform_power_off_notify(struct sys_off_data *data) +{ + void (*platform_power_power_off_cb)(void) =3D data->cb_data; + + platform_power_power_off_cb(); + + return NOTIFY_DONE; +} + +/** + * register_platform_power_off - Register platform-level power-off callback + * @power_off: Power-off callback + * + * Registers power-off callback that will be called as last step + * of the power-off sequence. This callback is expected to be invoked + * for the last resort. Only one platform power-off callback is allowed + * to be registered at a time. + * + * Returns zero on success, or error code on failure. + */ +int register_platform_power_off(void (*power_off)(void)) +{ + struct sys_off_handler *handler; + + handler =3D register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, + SYS_OFF_PRIO_PLATFORM, + platform_power_off_notify, + power_off); + if (IS_ERR(handler)) + return PTR_ERR(handler); + + platform_power_off_handler =3D handler; + + return 0; +} +EXPORT_SYMBOL_GPL(register_platform_power_off); + +/** + * unregister_platform_power_off - Unregister platform-level power-off cal= lback + * @power_off: Power-off callback + * + * Unregisters previously registered platform power-off callback. + */ +void unregister_platform_power_off(void (*power_off)(void)) +{ + if (platform_power_off_handler && + platform_power_off_handler->cb_data =3D=3D power_off) { + unregister_sys_off_handler(platform_power_off_handler); + platform_power_off_handler =3D NULL; + } +} +EXPORT_SYMBOL_GPL(unregister_platform_power_off); + static int legacy_pm_power_off_prepare(struct sys_off_data *data) { if (pm_power_off_prepare) --=20 2.35.1