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Wed, 17 Mar 2021 10:29:49 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node2.st.com [10.75.127.5]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 0528821E665; Wed, 17 Mar 2021 10:29:49 +0100 (CET) Received: from lmecxl0889.lme.st.com (10.75.127.50) by SFHDAG2NODE2.st.com (10.75.127.5) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 17 Mar 2021 10:29:48 +0100 Subject: Re: [PATCH v5 00/16] introduce a generic IOCTL interface for RPMsg channels management To: Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier , Andy Gross CC: , , , References: <20210219111501.14261-1-arnaud.pouliquen@foss.st.com> From: Arnaud POULIQUEN Message-ID: <8599da66-b7df-e4a5-fcf3-008620420372@foss.st.com> Date: Wed, 17 Mar 2021 10:29:47 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210219111501.14261-1-arnaud.pouliquen@foss.st.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.75.127.50] X-ClientProxiedBy: SFHDAG2NODE3.st.com (10.75.127.6) To SFHDAG2NODE2.st.com (10.75.127.5) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-17_05:2021-03-17,2021-03-17 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/19/21 12:14 PM, Arnaud Pouliquen wrote: > This series restructures the RPMsg char driver to decorrelate the control part and to > create a generic RPMsg ioctl interface compatible with other RPMsg services. > > The V4 and V5 fix compilation issues reported by the kernel test robot > and analyzed by Dan Carpenter . > > The V3 is based on the guideline proposed by Mathieu Poirier to keep as much as possible > the legacy implementation of the rpmsg_char used by the GLINK and SMD platforms. > > Objectives of the series: > - Allow to create a service from Linux user application: > - with a specific name > - with or without name service announcement. > - Allow to probe the same service by receiving either a NS announcement from the remote firmware > or a Linux user application request. > - Use these services independently of the RPMsg transport implementation (e.g be able to use > RPMSg char with the RPMsg virtio bus). > > Steps in the series: > - Extract the control part of the char dev and create the rpmsg_ctrl.c file (patches 1 to 6) > - Enable the use of the chardev with the virtio backend (patches 7 to 11) > - Introduce the RPMSG_CREATE_DEV_IOCTL IOCTL to instantiate RPMsg devices (patch 12) > The application can then create or release a channel by specifying: > - the name service of the device to instantiate. > - the source address. > - the destination address. > - Instantiate the /dev/rpmsg interface on remote NS announcement (patches 13 to 16) > > In this revision, I do not divide the series into several parts in order to show a complete > picture of the proposed evolution. To simplify the review, if requested, I can send it in > several steps listed above. No new revision of this series planned, but move forward by splitting it in 3 new series to ease the review. The first step is addressed here: https://patchwork.kernel.org/project/linux-remoteproc/list/?series=446305 > > Known current Limitations: > - Tested only with virtio RPMsg bus. The glink and smd drivers adaptations have not been tested > (not able to test it). > - For the virtio backend: No NS announcement is sent to the remote processor if the source > address is set to RPMSG_ADDR_ANY. > - For the virtio backend: the existing RPMSG_CREATE_EPT_IOCTL is working but the endpoints are > not attached to an exiting channel. > - to limit patches the pending RPMSG_DESTROY_DEV_IOCTL has not ben implemented. This will be > proposed in a second step. > > This series can be applied on git/andersson/remoteproc.git for-next branch (d9ff3a5789cb). > > This series can be tested using rpmsgexport, rpmsgcreatedev and ping tools available here: > https://github.com/arnopo/rpmsgexport.git > > Reference to the V4 discussion thread: https://lkml.org/lkml/2021/2/17/384 > > Arnaud Pouliquen (16): > rpmsg: char: rename rpmsg_char_init to rpmsg_chrdev_init > rpmsg: move RPMSG_ADDR_ANY in user API > rpmsg: add short description of the IOCTL defined in UAPI. > rpmsg: char: export eptdev create an destroy functions > rpmsg: char: dissociate the control device from the rpmsg class > rpmsg: move the rpmsg control device from rpmsg_char to rpmsg_ctrl > rpmsg: update rpmsg_chrdev_register_device function > rpmsg: glink: add sendto and trysendto ops > rpmsg: smd: add sendto and trysendto ops > rpmsg: char: use sendto to specify the message destination address > rpmsg: virtio: register the rpmsg_ctrl device > rpmsg: ctrl: introduce RPMSG_CREATE_DEV_IOCTL > rpmsg: char: introduce __rpmsg_chrdev_create_eptdev function > rpmsg: char: introduce a RPMsg driver for the RPMsg char device > rpmsg: char: no dynamic endpoint management for the default one > rpmsg: char: return an error if device already open > > drivers/rpmsg/Kconfig | 9 ++ > drivers/rpmsg/Makefile | 1 + > drivers/rpmsg/qcom_glink_native.c | 18 ++- > drivers/rpmsg/qcom_smd.c | 18 ++- > drivers/rpmsg/rpmsg_char.c | 237 +++++++++++------------------- > drivers/rpmsg/rpmsg_char.h | 51 +++++++ > drivers/rpmsg/rpmsg_ctrl.c | 229 +++++++++++++++++++++++++++++ > drivers/rpmsg/rpmsg_internal.h | 10 +- > drivers/rpmsg/virtio_rpmsg_bus.c | 57 ++++++- > include/linux/rpmsg.h | 3 +- > include/uapi/linux/rpmsg.h | 18 ++- > 11 files changed, 485 insertions(+), 166 deletions(-) > create mode 100644 drivers/rpmsg/rpmsg_char.h > create mode 100644 drivers/rpmsg/rpmsg_ctrl.c >