From patchwork Fri Mar 27 16:36:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 202718 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CAADC2D0ED for ; Fri, 27 Mar 2020 16:37:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 730F6206E6 for ; Fri, 27 Mar 2020 16:37:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727766AbgC0QhJ (ORCPT ); Fri, 27 Mar 2020 12:37:09 -0400 Received: from foss.arm.com ([217.140.110.172]:48540 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727726AbgC0QhI (ORCPT ); Fri, 27 Mar 2020 12:37:08 -0400 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 6D42131B; Fri, 27 Mar 2020 09:37:08 -0700 (PDT) Received: from usa.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 894EE3F71F; Fri, 27 Mar 2020 09:37:07 -0700 (PDT) From: Sudeep Holla To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Peng Fan Cc: Sudeep Holla , f.fainelli@gmail.com, linux-imx@nxp.com Subject: [PATCH 1/4] firmware: arm_scmi: Make mutex channel specific Date: Fri, 27 Mar 2020 16:36:51 +0000 Message-Id: <20200327163654.13389-2-sudeep.holla@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200327163654.13389-1-sudeep.holla@arm.com> References: <20200327163654.13389-1-sudeep.holla@arm.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org In order to support multiple SMC/HVC transport channels with associated shared memory, it is better to maintain the mutex per channel instead of existing global one. Move the smc_mutex into the scmi_smc structure and also rename it to shmem_lock which is more appropriate for it's use. Signed-off-by: Sudeep Holla --- drivers/firmware/arm_scmi/smc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c index 336168e40f49..6dc8a88cc91b 100644 --- a/drivers/firmware/arm_scmi/smc.c +++ b/drivers/firmware/arm_scmi/smc.c @@ -27,11 +27,10 @@ struct scmi_smc { struct scmi_chan_info *cinfo; struct scmi_shared_mem __iomem *shmem; + struct mutex shmem_lock; u32 func_id; }; -static DEFINE_MUTEX(smc_mutex); - static bool smc_chan_available(struct device *dev, int idx) { return true; @@ -78,6 +77,7 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, scmi_info->func_id = func_id; scmi_info->cinfo = cinfo; + mutex_init(&scmi_info->shmem_lock); cinfo->transport_info = scmi_info; return 0; @@ -102,14 +102,14 @@ static int smc_send_message(struct scmi_chan_info *cinfo, struct scmi_smc *scmi_info = cinfo->transport_info; struct arm_smccc_res res; - mutex_lock(&smc_mutex); + mutex_lock(&scmi_info->shmem_lock); shmem_tx_prepare(scmi_info->shmem, xfer); arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem)); - mutex_unlock(&smc_mutex); + mutex_unlock(&scmi_info->shmem_lock); return res.a0; }