From patchwork Thu Dec 19 07:31:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ahmad Fatoum X-Patchwork-Id: 13914682 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF3112163A9 for ; Thu, 19 Dec 2024 07:50:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734594646; cv=none; b=T7hv7xvZwlICYAdzwa8IoJmL82GnEb9Us//yQQLpLsCMnXkdSiP0+aJRLDmNpRKxTU2UVwh/kCQwb9mTmiUFZXVI5ntmEvjfMp+ld8tqEYrcgitfmM+8bSD4yG9s68W0iw/5xgErwOlccMveeVu22enEK33W0ZQ7KsfQqQ1G7tA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734594646; c=relaxed/simple; bh=Dwk6bXNu5eZTvBfMa7fJbM+NhBSxfOByQaqOb5V8mPQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Z3fEKSGgQcKaA/l9xfflipjGKh+R+PRA95TpkABZtx5dhUNU85PI4zq1lyTM7qrvShrjDaYi+0NKxvLbYTHB4A7Thm5o8UDizNpCcCIZ991kGonBtq2AlVYjOX6jCYXo9VHRmz6Sfri8/5fro9cZdIznMwc2qWRlZ4/04WxGbpI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tOBId-0003kT-Pr; Thu, 19 Dec 2024 08:50:23 +0100 Received: from dude05.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::54]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tOBIc-004AWh-0Q; Thu, 19 Dec 2024 08:50:22 +0100 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1tOB0M-00GkbH-0u; Thu, 19 Dec 2024 08:31:30 +0100 From: Ahmad Fatoum Date: Thu, 19 Dec 2024 08:31:32 +0100 Subject: [PATCH 11/11] reboot: retire hw_protection_reboot and hw_protection_shutdown helpers Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241219-hw_protection-reboot-v1-11-263a0c1df802@pengutronix.de> References: <20241219-hw_protection-reboot-v1-0-263a0c1df802@pengutronix.de> In-Reply-To: <20241219-hw_protection-reboot-v1-0-263a0c1df802@pengutronix.de> To: Daniel Lezcano , Fabio Estevam , "Rafael J. Wysocki" , Zhang Rui , Lukasz Luba , Jonathan Corbet , Serge Hallyn , Liam Girdwood , Mark Brown , Matti Vaittinen , Benson Leung , Tzung-Bi Shih , Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-doc@vger.kernel.org, linux-security-module@vger.kernel.org, chrome-platform@lists.linux.dev, devicetree@vger.kernel.org, kernel@pengutronix.de, Ahmad Fatoum X-Mailer: b4 0.14.2 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: a.fatoum@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-security-module@vger.kernel.org The hw_protection_reboot and hw_protection_shutdown functions mix mechanism with policy: They let the driver requesting an emergency action for hardware protection also decide how to deal with it. This is inadequate in the general case as a driver reporting e.g. an imminent power failure can't know whether a shutdown or a reboot would be more appropriate for a given hardware platform. With the addition of the hw_protection parameter, it's now possible to configure at runtime the default emergency action and drivers are expected to use hw_protection_trigger to have this parameter dictate policy. As no current users of either hw_protection_shutdown or hw_protection_shutdown helpers remain, remove them, as not to tempt driver authors to call them. Existing users now either defer to hw_protection_trigger or call __hw_protection_trigger with a suitable argument directly when they have inside knowledge on whether a reboot or shutdown would be more appropriate. Signed-off-by: Ahmad Fatoum --- include/linux/reboot.h | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 281696f509932e444eadd453fb0233aa7a07fbce..5c709463a7f85189e169bbaeb8bb7b115b20c996 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -200,16 +200,6 @@ static inline void hw_protection_trigger(const char *reason, int ms_until_forced __hw_protection_trigger(reason, ms_until_forced, HWPROT_ACT_DEFAULT); } -static inline void hw_protection_reboot(const char *reason, int ms_until_forced) -{ - __hw_protection_trigger(reason, ms_until_forced, HWPROT_ACT_REBOOT); -} - -static inline void hw_protection_shutdown(const char *reason, int ms_until_forced) -{ - __hw_protection_trigger(reason, ms_until_forced, HWPROT_ACT_SHUTDOWN); -} - /* * Emergency restart, callable from an interrupt handler. */