From patchwork Fri Oct 22 12:54:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaud Pouliquen X-Patchwork-Id: 12577739 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 47AA2C433EF for ; Fri, 22 Oct 2021 12:55:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 359446109F for ; Fri, 22 Oct 2021 12:55:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232923AbhJVM5d (ORCPT ); Fri, 22 Oct 2021 08:57:33 -0400 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:56302 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232825AbhJVM5N (ORCPT ); Fri, 22 Oct 2021 08:57:13 -0400 Received: from pps.filterd (m0046668.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 19MAXM3w030715; Fri, 22 Oct 2021 14:54:47 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=selector1; bh=L3uD6wAGjynFy5k2UO0gyKUqRxQ2k8PGG1EstA7Sv7w=; b=jz7UT3T0uOR4TJh5tmsrU5+Q/mWpakaB0KrIjSl0xJiAN11kLoyRlk6vvGarXumgsXlp 7k/VJW3KDVTgJfbaB3i9doFEIDwVwmAQoh1orIl1l1Gn0dXQwiqzzlAWnlKojdURcLvc QEnWo2ypJKsj3Gpjg1oVNcx/ctnxhXP+5ZUrp3sOM+wN4PtRADWERr+mJeybDNtzD6QS pRkG4oMHuAqefb1dZpZciIQlmQeWWXF6PACjwzLWbxhxEgBnrrcGjnFjVdCCJwzgpO+H 7m/dafn20YTptY0OvUA/BUOH9R1d00Y7t3IS2AB4N+rGA4azFykif4CCCkZCORsAt7EP 5g== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 3bupuytr83-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 22 Oct 2021 14:54:47 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 901B510002A; Fri, 22 Oct 2021 14:54:46 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node2.st.com [10.75.127.5]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 8801521A226; Fri, 22 Oct 2021 14:54:46 +0200 (CEST) Received: from localhost (10.75.127.50) by SFHDAG2NODE2.st.com (10.75.127.5) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Fri, 22 Oct 2021 14:54:46 +0200 From: Arnaud Pouliquen To: Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier CC: , , , , Subject: [PATCH v6 09/10] rpmsg: ctrl: Introduce new RPMSG_CREATE/RELEASE_DEV_IOCTL controls Date: Fri, 22 Oct 2021 14:54:25 +0200 Message-ID: <20211022125426.2579-10-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211022125426.2579-1-arnaud.pouliquen@foss.st.com> References: <20211022125426.2579-1-arnaud.pouliquen@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.50] X-ClientProxiedBy: SFHDAG2NODE1.st.com (10.75.127.4) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-10-22_03,2021-10-22_01,2020-04-07_01 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Allow the user space application to create and release an rpmsg device by adding RPMSG_CREATE_DEV_IOCTL and RPMSG_RELEASE_DEV_IOCTL ioctrls to the /dev/rpmsg_ctrl interface The RPMSG_CREATE_DEV_IOCTL Ioctl can be used to instantiate a local rpmsg device. Depending on the back-end implementation, the associated rpmsg driver is probed and a NS announcement can be sent to the remote processor. The RPMSG_RELEASE_DEV_IOCTL allows the user application to release a rpmsg device created either by the remote processor or with the RPMSG_CREATE_DEV_IOCTL call. Depending on the back-end implementation, the associated rpmsg driver is removed and a NS destroy rpmsg can be sent to the remote processor. Suggested-by: Mathieu Poirier Signed-off-by: Arnaud Pouliquen Reviewed-by: Mathieu Poirier --- drivers/rpmsg/rpmsg_ctrl.c | 37 +++++++++++++++++++++++++++++++++---- include/uapi/linux/rpmsg.h | 10 ++++++++++ 2 files changed, 43 insertions(+), 4 deletions(-) diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c index 4734ce9d927b..b9b925ed2f32 100644 --- a/drivers/rpmsg/rpmsg_ctrl.c +++ b/drivers/rpmsg/rpmsg_ctrl.c @@ -23,6 +23,7 @@ #include #include "rpmsg_char.h" +#include "rpmsg_internal.h" static dev_t rpmsg_major; @@ -37,11 +38,13 @@ static DEFINE_IDA(rpmsg_minor_ida); * @rpdev: underlaying rpmsg device * @cdev: cdev for the ctrl device * @dev: device for the ctrl device + * @ctrl_lock: serialize the ioctrls. */ struct rpmsg_ctrldev { struct rpmsg_device *rpdev; struct cdev cdev; struct device dev; + struct mutex ctrl_lock; }; static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) @@ -70,9 +73,8 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, void __user *argp = (void __user *)arg; struct rpmsg_endpoint_info eptinfo; struct rpmsg_channel_info chinfo; - - if (cmd != RPMSG_CREATE_EPT_IOCTL) - return -EINVAL; + struct rpmsg_device *rpdev; + int ret = 0; if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) return -EFAULT; @@ -82,7 +84,33 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, chinfo.src = eptinfo.src; chinfo.dst = eptinfo.dst; - return rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo); + mutex_lock(&ctrldev->ctrl_lock); + switch (cmd) { + case RPMSG_CREATE_EPT_IOCTL: + ret = rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo); + break; + + case RPMSG_CREATE_DEV_IOCTL: + rpdev = rpmsg_create_channel(ctrldev->rpdev, &chinfo); + if (!rpdev) { + dev_err(&ctrldev->dev, "failed to create %s channel\n", chinfo.name); + ret = -ENXIO; + } + break; + + case RPMSG_RELEASE_DEV_IOCTL: + ret = rpmsg_release_channel(ctrldev->rpdev, &chinfo); + if (ret) + dev_err(&ctrldev->dev, "failed to release %s channel (%d)\n", + chinfo.name, ret); + break; + + default: + ret = -EINVAL; + } + mutex_unlock(&ctrldev->ctrl_lock); + + return ret; }; static const struct file_operations rpmsg_ctrldev_fops = { @@ -120,6 +148,7 @@ static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev) dev->parent = &rpdev->dev; dev->class = rpmsg_get_class(); + mutex_init(&ctrldev->ctrl_lock); cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); ctrldev->cdev.owner = THIS_MODULE; diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h index f5ca8740f3fb..1637e68177d9 100644 --- a/include/uapi/linux/rpmsg.h +++ b/include/uapi/linux/rpmsg.h @@ -33,4 +33,14 @@ struct rpmsg_endpoint_info { */ #define RPMSG_DESTROY_EPT_IOCTL _IO(0xb5, 0x2) +/** + * Instantiate a new local rpmsg service device. + */ +#define RPMSG_CREATE_DEV_IOCTL _IOW(0xb5, 0x3, struct rpmsg_endpoint_info) + +/** + * Release a local rpmsg device. + */ +#define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info) + #endif