From nobody Tue Apr 7 19:47:13 2026 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 EB569C28D13 for ; Thu, 25 Aug 2022 14:13:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241948AbiHYONA (ORCPT ); Thu, 25 Aug 2022 10:13:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241601AbiHYOMf (ORCPT ); Thu, 25 Aug 2022 10:12:35 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 01D988A6CF for ; Thu, 25 Aug 2022 07:12:27 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E3386106F; Thu, 25 Aug 2022 07:12:31 -0700 (PDT) Received: from e120937-lin.home (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 754E23F71A; Thu, 25 Aug 2022 07:12:25 -0700 (PDT) From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: sudeep.holla@arm.com, james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com, f.fainelli@gmail.com, etienne.carriere@linaro.org, vincent.guittot@linaro.org, souvik.chakravarty@arm.com, wleavitt@marvell.com, peter.hilber@opensynergy.com, nicola.mazzucato@arm.com, tarek.el-sherbiny@arm.com, cristian.marussi@arm.com Subject: [PATCH v2 8/9] firmware: arm_scmi: Reject SCMI drivers while in Raw mode Date: Thu, 25 Aug 2022 15:11:51 +0100 Message-Id: <20220825141152.2334536-9-cristian.marussi@arm.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220825141152.2334536-1-cristian.marussi@arm.com> References: <20220825141152.2334536-1-cristian.marussi@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Reject SCMI driver registration when SCMI Raw mode support is configured, so as to avoid interferences between the SCMI Raw mode transactions and the normal SCMI stack operations. Signed-off-by: Cristian Marussi --- drivers/firmware/arm_scmi/driver.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi= /driver.c index fd131e499e15..7742581b94c7 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -2331,6 +2331,12 @@ int scmi_protocol_device_request(const struct scmi_d= evice_id *id_table) pr_debug("Requesting SCMI device (%s) for protocol %x\n", id_table->name, id_table->protocol_id); =20 + if (IS_ENABLED(CONFIG_ARM_SCMI_RAW_MODE_SUPPORT)) { + pr_warn("SCMI Raw mode active. Rejecting '%s'/0x%02X\n", + id_table->name, id_table->protocol_id); + return -EINVAL; + } + /* * Search for the matching protocol rdev list and then search * of any existent equally named device...fails if any duplicate found. --=20 2.32.0