[PATCH v3 0/6] Restructure the rpmsg char and introduce the rpmsg-raw channel

From: Arnaud Pouliquen
Date: Thu Apr 29 2021 - 09:55:47 EST

Main update from V2 [1]
- Management of the endpoint creation/release to handle it for all the use cases
in the rpmsg_eptdev_open and rpmsg_eptdev_release function

Other patch updates are described at the end of their commit message.

This series can be applied on git/andersson/remoteproc.git
for-next branch (dc0e14fa833b) + "rpmsg: char: Remove useless includes" patch[3].

Series description:
This series is the second step in the division of the series [2]:
"Introducing a Generic IOCTL Interface for RPMsg Channel Management".

The purpose of this patchset is to:
- split the control code related to the control
and the endpoint.
- define the rpmsg-raw channel, associated with the rpmsg char device to
allow it to be instantiated using a name service announcement.

An important point to keep in mind for this patchset is that the concept of
channel is associated with a default endpoint. To facilitate communication
with the remote side, this default endpoint must have a fixed address.

Therefore, for /dev/rpmsgX device created during the instantiation of he "rpmsg-raw"
device, the endpoint creation/release is not dynamically managed on each FS open/close.

This is only applicable for channels probed by the rpmsg bus. The behavior,
using the RPMSG_CREATE_EPT_IOCTL and RPMSG_DESTROY_EPT_IOCTL controls, is preserved.

The next step should be:
to instantiate the rpmsg devices

[1]: https://patchwork.kernel.org/project/linux-remoteproc/list/?series=466357
[2]: https://patchwork.kernel.org/project/linux-remoteproc/list/?series=435523
[3]: https://patchwork.kernel.org/project/linux-remoteproc/patch/20210429080639.6379-1-arnaud.pouliquen@xxxxxxxxxxx/

Arnaud Pouliquen (6):
rpmsg: char: Export eptdev create an destroy functions
rpmsg: Move the rpmsg control device from rpmsg_char to rpmsg_ctrl
rpmsg: Update rpmsg_chrdev_register_device function
rpmsg: char: Add possibility to create and reuse default endpoint
rpmsg: char: Introduce a rpmsg driver for the rpmsg char device
rpmsg: char: Return error if user tries to destroy a default endpoint.

drivers/rpmsg/Kconfig | 9 ++
drivers/rpmsg/Makefile | 1 +
drivers/rpmsg/qcom_glink_native.c | 2 +-
drivers/rpmsg/qcom_smd.c | 2 +-
drivers/rpmsg/rpmsg_char.c | 223 ++++++++++--------------------
drivers/rpmsg/rpmsg_char.h | 51 +++++++
drivers/rpmsg/rpmsg_ctrl.c | 209 ++++++++++++++++++++++++++++
drivers/rpmsg/rpmsg_internal.h | 8 +-
drivers/rpmsg/virtio_rpmsg_bus.c | 2 +-
9 files changed, 350 insertions(+), 157 deletions(-)
create mode 100644 drivers/rpmsg/rpmsg_char.h
create mode 100644 drivers/rpmsg/rpmsg_ctrl.c