From patchwork Tue Dec 22 10:57:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaud Pouliquen X-Patchwork-Id: 11986319 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,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 F3358C433E0 for ; Tue, 22 Dec 2020 10:58:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B6D7323103 for ; Tue, 22 Dec 2020 10:58:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725937AbgLVK6r (ORCPT ); Tue, 22 Dec 2020 05:58:47 -0500 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:7242 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725785AbgLVK6q (ORCPT ); Tue, 22 Dec 2020 05:58:46 -0500 Received: from pps.filterd (m0046668.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 0BMAvIsl004047; Tue, 22 Dec 2020 11:57:59 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=selector1; bh=udCeyTxsbq23gfM8tPSsY63UuxyyFwwhHocq4F3kNCU=; b=s/qo5F1LSfov3N6KiW7oLo+tngFJCqliBam3XojjcsJNelPXI++XReLYrh2S+tuk7tR0 HhmXNUVDiXK8woiBTEdPDQ9pdmWUX7Ic8OJTGR9x048/YQ6xW1Iw22aGh4g0uAamnazh WzAEylJnd6dOtKUfzjIok/gYbSJQea3fy5EStc6bArzVkAiadmG5m2ws7qsH47e667RU F77uPo33yqJshZxx1NA5CHBna8R4wbBVbGV5/qasradtL9UFvkb2sk82ewJ/XVg5yr8M zqGxNup3SJF99kXZ6C3A3ojZvf5LibGv26MD2DbdaCvkSucRTAmP1RnKnqfhtvtfpsYF MQ== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 35k0d1bjtd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 22 Dec 2020 11:57:59 +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 0A4F710002A; Tue, 22 Dec 2020 11:57:59 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id E36EB231602; Tue, 22 Dec 2020 11:57:58 +0100 (CET) Received: from localhost (10.75.127.48) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 22 Dec 2020 11:57:58 +0100 From: Arnaud Pouliquen To: Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier , Andy Gross CC: , , , , Subject: [PATCH v2 00/16] introduce generic IOCTL interface for RPMsg channels management Date: Tue, 22 Dec 2020 11:57:10 +0100 Message-ID: <20201222105726.16906-1-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.75.127.48] X-ClientProxiedBy: SFHDAG3NODE2.st.com (10.75.127.8) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343,18.0.737 definitions=2020-12-22_04:2020-12-21,2020-12-22 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This series is a restructuring of the RPMsg char driver, to create a generic RPMsg ioctl interface for all rpmsg services. The RPMsg char driver provides interfaces that: - expose a char RPMsg device for communication with the remote processor, - expose controls interface for applications to create and release endpoints. The objective of this series is to decorrelate the two interfaces: - Provide a char device for a RPMsg raw service in the rpmsg_char that can be probed by a RPMsg bus on a ns announcement. - Generalize the use of the ioctl for all RPMsg services by creating the rpmsg_ctrl, but keep it compatibile with the legacy. If the V1 create a new rpmsg_raw driver in addition to the rpmsg_ctrl this version try to reuse the rpmsg_char driver by addapting QCOM GLINK and SMD drivers. So a goal of this version is to help to determine the best strategy to move forward: - reuse rpmsg_char. - introduce a new driver and keep rpmsg_char as a legacy driver for a while. Notice that SMD and GLINK patches have to be tested, only build has been tested. 1) RPMsg control driver: rpmsg_ctrl.c This driver is based on the control part of the RPMsg_char driver. On probe a /dev/rpmsg_ctrl interface is created to allow to manage the channels. The principles are the following: - The RPMsg service driver registers it's name and the associated service using the rpmsg_ctrl_unregister_ctl API. The list of supported services is defined in include/uapi/linux/rpmsg.h and exposed to the application thanks to a new field in rpmsg_endpoint_info struct. - On the RPMsg bus probe(e.g virtio bus) an rpmsg_ctrl device is registered that creates the control interface. - The application can then create or release a channel by specifying: - the name service - the source address. - the destination address. - The rpmsg_ctrl uses the same interface than the ns announcement to create and release the associated channel but using the driver_override field to force the service name. The "driver_override" allows to force the name service associated to an RPMsg driver, bypassing the rpmsg_device_id based match check. - At least for virtio bus, an associated ns announcement is sent to the remote side. 2) rpmsg char driver: rpmsg_char.c - The rpmsg class has not been removed. The associated attributes are already available in /sys/bus/rpmsg/. - The eptdev device is now an RPMsg device probed by a RPMsg bus driver (probed only by the ioctl in rpmsg_char driver). Know current Limitations: - Tested only with virtio RPMsg bus and for one vdev instance. - The glink and smd drivers adaptations have not been tested (not able to test). - To limit commit and not update the IOCT interface some features have been not implemented in this first step: - the NS announcement as not been updated, it is not possible to create an endpoint with a destibnation address set to RPMSG_ADDR_ANY (-1), - not possible to destroy the channel, - only the "rpmsg-raw" service is supported. This series can be applied in Bjorn's rpmsg-next branch on top of the RPMsg_ns series(4c0943255805). This series can be tested using rpmsgexport tools available here: https://github.com/andersson/rpmsgexport. --- new from V1[1]: - In V1 the rpmsg_char.c was not impacted, a rpmsg_raw.c has been created instead. - IOCTL interface as not been updated (to go by steps). - smd and glink drivers has been updated to support channels creation and release. [1] https://patchwork.kernel.org/project/linux-remoteproc/list/?series=327277 Arnaud Pouliquen (16): rpmsg: introduce RPMsg control driver for channel creation rpmsg: add RPMsg control API to register service rpmsg: add override field in channel info rpmsg: ctrl: implement the ioctl function to create device rpmsg: ns: initialize channel info override field rpmsg: add helper to register the rpmsg ctrl device rpmsg: char: clean up rpmsg class rpmsg: char: make char rpmsg a rpmsg device without the control part rpmsg: char: register RPMsg raw service to the ioctl interface. rpmsg: char: allow only one endpoint per device rpmsg: char: check destination address is not null rpmsg: virtio: use the driver_override in channel creation ops rpmsg: virtio: probe the rpmsg_ctl device rpmsg: glink: add create and release rpmsg channel ops rpmsg: smd: add create and release rpmsg channel ops rpmsg: replace rpmsg_chrdev_register_device use drivers/rpmsg/Kconfig | 8 + drivers/rpmsg/Makefile | 1 + drivers/rpmsg/qcom_glink_native.c | 96 +++++++-- drivers/rpmsg/qcom_smd.c | 59 +++++- drivers/rpmsg/rpmsg_char.c | 246 ++++++----------------- drivers/rpmsg/rpmsg_ctrl.c | 320 ++++++++++++++++++++++++++++++ drivers/rpmsg/rpmsg_internal.h | 14 -- drivers/rpmsg/rpmsg_ns.c | 1 + drivers/rpmsg/virtio_rpmsg_bus.c | 38 +++- include/linux/rpmsg.h | 40 ++++ include/uapi/linux/rpmsg.h | 14 ++ 11 files changed, 606 insertions(+), 231 deletions(-) create mode 100644 drivers/rpmsg/rpmsg_ctrl.c