Message-ID: <239eeeea-af04-7163-61ca-436c6632c2a8@foss.st.com>
Date:   Thu, 24 Mar 2022 18:36:23 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>, <julien.massot@....bzh>
Subject: Re: [PATCH v9 00/11] Restructure the rpmsg_char driver and introduce
 rpmsg_ctrl driver

Hi Bjorn,

On 1/24/22 11:25, Arnaud Pouliquen wrote:
> Updates from V8 [1]:
> - rebase on 5.17-rc1 + rpmsg char cdev release fixes[2][3]
> - updates based on Bjorn Andersson's comments:
>   - remove rpmsg_create_default_ept API, set directly the ept->priv in rpmsg_chrdev_probe
>     function.
>   - rework commit message in [8/9]rpmsg: char: Introduce the "rpmsg-raw" channel
> 
> Patchset description:
> 
> The current rpmsg_char module implements a /dev/rpmsg_ctrl interface that provides the ability to
> instantiate char devices (/dev/rpmsgX) associated with an rpmsg endpoint for communication with the
> remote processor.
> This implementation fits with QCOM rpmsg backend but not with the magement by chanel implemented
> in the generic rpmsg virtio backend.
> This series restructures the rpmsg_char driver to decorrelate the control part from the data part
> in order to improve its compatible with the rpmsg virtio backend.
> 
> Objective:
> - Expose a /dev/rpmsg_ctrlX interface for the application that is no longer dedicated to the
>   rpmsg_char but generalized to all rpmsg services. This offers capability to create and destroy
>   rpmsg channels from a user's application initiative (using the new RPMSG_CREATE_DEV_IOCTL and
>   RPMSG_DESTROY_DEV_IOCTL controls).
>   An application will be able to create/establish an rpmsg communication channel to communicate
>   with the remote processor, and not only wait the remote processor initiative.
>   This is interesting for example to establish a temporary communication link for diagnosis,
>   calibration, debugging... or instantiate  new data flows on some user actions.
> - Add capability to probe the rpmsg_char device at the initiative of the remote processor
>  (rpmsg service announcement mechanism).
>   This allows platforms based on the rpmsg virtio backend to create the /dev/rpmgX interface with
>   a rpmsg name service announcement.
> 
> Subsets:
>   - Extract the control part of the char dev and create the rpmsg_ctrl.c file (patches 1 to 6)
>   - Introduce the "rpmsg-raw" channel in rpmsg_char(patches 7 to 10)
>   - Introduce the RPMSG_CREATE_DEV_IOCTL IOCTL and RPMSG_DESTROY_DEV_IOCTL to instantiate RPMsg
>     devices (patch 11)
>     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.
> 
> This series has be applied and tested on 'commit e783362eb54c ("Linux 5.17-rc1") +
> rpmsg_char cdev release fixes [2][3]
> 
> [1] https://lkml.org/lkml/2021/12/7/186
> [2] https://lkml.org/lkml/2022/1/10/1129
> [3] https://lkml.org/lkml/2022/1/10/1130
> 
> Arnaud Pouliquen (11):
>   rpmsg: char: Export eptdev create and destroy functions
>   rpmsg: Create the rpmsg class in core instead of in rpmsg char
>   rpmsg: Move the rpmsg control device from rpmsg_char to rpmsg_ctrl


>   arm: configs: Configs that had RPMSG_CHAR now get RPMSG_CTRL
>   RISC-V: configs: Configs that had RPMSG_CHAR now get RPMSG_CTRL
>   arm64: defconfig: Config that had RPMSG_CHAR now gets RPMSG_CTRL

Thank you for merging this series!

I can't see in the "for next" branch[1] the 3 patches above that update configs
Are you expecting a specific action from me?   

[1]https://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux.git

Regards,
Arnaud

>   rpmsg: Update rpmsg_chrdev_register_device function
>   rpmsg: char: Refactor rpmsg_chrdev_eptdev_create function
>   rpmsg: char: Add possibility to use default endpoint of the rpmsg
>     device
>   rpmsg: char: Introduce the "rpmsg-raw" channel
>   rpmsg: ctrl: Introduce new RPMSG_CREATE/RELEASE_DEV_IOCTL controls
> 
>  arch/arm/configs/qcom_defconfig   |   1 +
>  arch/arm64/configs/defconfig      |   1 +
>  arch/riscv/configs/defconfig      |   1 +
>  arch/riscv/configs/rv32_defconfig |   1 +
>  drivers/rpmsg/Kconfig             |   8 +
>  drivers/rpmsg/Makefile            |   1 +
>  drivers/rpmsg/qcom_glink_native.c |   2 +-
>  drivers/rpmsg/qcom_smd.c          |   2 +-
>  drivers/rpmsg/rpmsg_char.c        | 231 +++++++++++-----------------
>  drivers/rpmsg/rpmsg_char.h        |  46 ++++++
>  drivers/rpmsg/rpmsg_core.c        |  15 +-
>  drivers/rpmsg/rpmsg_ctrl.c        | 243 ++++++++++++++++++++++++++++++
>  drivers/rpmsg/rpmsg_internal.h    |  10 +-
>  drivers/rpmsg/virtio_rpmsg_bus.c  |   2 +-
>  include/uapi/linux/rpmsg.h        |  10 ++
>  15 files changed, 419 insertions(+), 155 deletions(-)
>  create mode 100644 drivers/rpmsg/rpmsg_char.h
>  create mode 100644 drivers/rpmsg/rpmsg_ctrl.c
> 

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