Messages in this thread | | | From | Arnaud Pouliquen <> | Subject | [PATCH v2 0/1] rpmsg: ctrl: Add ability to instantiate rpmsg device locally | Date | Mon, 21 Jun 2021 14:57:59 +0200 |
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Purpose: Allow the user space application to create and release an rpmsg device by adding rpmsg ioctrl to the /dev/rpmsg_ctrl interface
Aim: The current implementation is based on the enumeration of services by the remote processor to create a new channel and instantiate associated rpmsg device. There is no solution to create a rpmsg channel on user application request. If the rpmsg char driver allows adding a new endpoint over an existing channel, it does not offer the ability to create a new one. Adding the IOCTRL to instantiate rpmsg channels from the user application will allow to dynamically create and destroy rpmsg devices. Some examples of use are: - activate the service at the initiative of the application, - remove the communication on a specific channel before entering the suspend mode, - creating a temporary channel for debugging purposes.
Delta vs V1 [1] - Squah patches 1/4(rpmsg: ctrl: Introduce RPMSG_CREATE_DEV_IOCTL) and 2/4 (rpmsg: ctrl: Introduce RPMSG_RELEASE_DEV_IOCTL). - Remove the rpmsg device attribue to check if a rpmg device can be released, choose to trust the application (a similar trust already exists for the bind/unbind interface).
[1] https://patchwork.kernel.org/project/linux-remoteproc/list/?series=494021
How to test it: - This series can be applied on git/andersson/remoteproc.git for-next branch (dc0e14fa833b) + the "Restructure the rpmsg char to decorrelate the control part" series[2] - to test the ioctrl, a rpmsgexportdev tool is available here: https://github.com/arnopo/rpmsgexport
[2]https://patchwork.kernel.org/project/linux-remoteproc/list/?series=483793
Arnaud Pouliquen (1): rpmsg: ctrl: Introduce new RPMSG_CREATE/RELEASE_DEV_IOCTL controls
drivers/rpmsg/rpmsg_ctrl.c | 37 +++++++++++++++++++++++++++++++++---- include/uapi/linux/rpmsg.h | 10 ++++++++++ 2 files changed, 43 insertions(+), 4 deletions(-)
-- 2.17.1
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