From patchwork Tue Dec 7 08:08:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaud POULIQUEN X-Patchwork-Id: 12661289 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 DF179C433F5 for ; Tue, 7 Dec 2021 08:10:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232103AbhLGINs (ORCPT ); Tue, 7 Dec 2021 03:13:48 -0500 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:35008 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232195AbhLGINn (ORCPT ); Tue, 7 Dec 2021 03:13:43 -0500 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 1B71QLGN028789; Tue, 7 Dec 2021 09:10:02 +0100 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=7dwMWYSMdlELebKyY8Wrp74Lm64AOXgWkuA2NECH5CQ=; b=s6yuFvO1kNtBUqED75pfPHYzHLsQWlV9gU6zn2j1XK/AIzAz5KtMPuXYyGyUVMan0m+G 2vQXNa24Gva+TA3u3Ncy0D8KUBN+dosl1HYDzarlMxBU9ohxcXxA4VxmLYBDNxgcv3ic JFf0YgRgrtfRXVfrWR9R3eogF7rtzAvq73VSe3ZChP1/iAeYNusPsW5N6zUOTn0vr3Xj hlqG0jmH7aqBm1LTkIE2KM/KbceIs8jYZyr/KsLewPljVaQkISHw8Kx2oHIeFt5btVdu HSlj4zSUcvLtYfHByydXL+RmK4XdmR4ZqVWXxwmOcyjXDQWCgrHlX/uZmI+RLzG8pKH4 7Q== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3csg5tnbcy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 Dec 2021 09:10:02 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C11B1100039; Tue, 7 Dec 2021 09:10:01 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node2.st.com [10.75.127.5]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id B5AF5217B7D; Tue, 7 Dec 2021 09:10:01 +0100 (CET) Received: from localhost (10.75.127.51) by SFHDAG2NODE2.st.com (10.75.127.5) with Microsoft SMTP Server (TLS) id 15.0.1497.26; Tue, 7 Dec 2021 09:10:01 +0100 From: Arnaud Pouliquen To: Bjorn Andersson , Mathieu Poirier CC: , , , , Subject: [PATCH v8 11/13] rpmsg: char: Introduce the "rpmsg-raw" channel Date: Tue, 7 Dec 2021 09:08:41 +0100 Message-ID: <20211207080843.21222-12-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211207080843.21222-1-arnaud.pouliquen@foss.st.com> References: <20211207080843.21222-1-arnaud.pouliquen@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.51] X-ClientProxiedBy: SFHDAG1NODE2.st.com (10.75.127.2) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-07_03,2021-12-06_02,2021-12-02_01 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Allows to probe the endpoint device on a remote name service announcement, by registering a rpmsg_driverfor the "rpmsg-raw" channel. With this patch the /dev/rpmsgX interface can be instantiated by the remote firmware. Signed-off-by: Arnaud Pouliquen --- drivers/rpmsg/rpmsg_char.c | 64 ++++++++++++++++++++++++++++++++++++++ drivers/rpmsg/rpmsg_ctrl.c | 7 +++-- 2 files changed, 69 insertions(+), 2 deletions(-) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index cf97839f5833..92b44630e03a 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -435,6 +435,58 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent } EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create); +static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) +{ + struct rpmsg_channel_info chinfo; + struct rpmsg_eptdev *eptdev; + struct device *dev = &rpdev->dev; + + memcpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE); + chinfo.src = rpdev->src; + chinfo.dst = rpdev->dst; + + eptdev = rpmsg_chrdev_eptdev_alloc(rpdev, dev); + if (IS_ERR(eptdev)) + return PTR_ERR(eptdev); + + /* + * Create the default endpoint associated to the rpmsg device and provide rpmsg_eptdev + * structure as callback private data. + * Do not allow the creation and release of an endpoint on /dev/rpmsgX open and close, + * reuse the default endpoint instead + */ + eptdev->default_ept = rpmsg_create_default_ept(rpdev, rpmsg_ept_cb, eptdev, chinfo); + if (!eptdev->default_ept) { + dev_err(&rpdev->dev, "failed to create %s\n", chinfo.name); + put_device(dev); + kfree(eptdev); + return -EINVAL; + } + + return rpmsg_chrdev_eptdev_add(eptdev, chinfo); +} + +static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) +{ + int ret; + + ret = device_for_each_child(&rpdev->dev, NULL, rpmsg_chrdev_eptdev_destroy); + if (ret) + dev_warn(&rpdev->dev, "failed to destroy endpoints: %d\n", ret); +} + +static struct rpmsg_device_id rpmsg_chrdev_id_table[] = { + { .name = "rpmsg-raw" }, + { }, +}; + +static struct rpmsg_driver rpmsg_chrdev_driver = { + .probe = rpmsg_chrdev_probe, + .remove = rpmsg_chrdev_remove, + .id_table = rpmsg_chrdev_id_table, + .drv.name = "rpmsg_chrdev", +}; + static int rpmsg_chrdev_init(void) { int ret; @@ -445,12 +497,24 @@ static int rpmsg_chrdev_init(void) return ret; } + ret = register_rpmsg_driver(&rpmsg_chrdev_driver); + if (ret < 0) { + pr_err("rpmsg: failed to register rpmsg raw driver\n"); + goto free_region; + } + return 0; + +free_region: + unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); + + return ret; } postcore_initcall(rpmsg_chrdev_init); static void rpmsg_chrdev_exit(void) { + unregister_rpmsg_driver(&rpmsg_chrdev_driver); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); } module_exit(rpmsg_chrdev_exit); diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c index 59d2bd264fdb..298e75dc7774 100644 --- a/drivers/rpmsg/rpmsg_ctrl.c +++ b/drivers/rpmsg/rpmsg_ctrl.c @@ -10,6 +10,9 @@ * Based on rpmsg performance statistics driver by Michal Simek, which in turn * was based on TI & Google OMX rpmsg driver. */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include #include #include @@ -193,13 +196,13 @@ static int rpmsg_ctrldev_init(void) ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg_ctrl"); if (ret < 0) { - pr_err("rpmsg: failed to allocate char dev region\n"); + pr_err("failed to allocate char dev region\n"); return ret; } ret = register_rpmsg_driver(&rpmsg_ctrldev_driver); if (ret < 0) { - pr_err("rpmsg ctrl: failed to register rpmsg driver\n"); + pr_err("failed to register rpmsg driver\n"); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); }