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* [PATCH 0/4] rpmsg: char: introduce the rpmsg-raw channel
@ 2021-06-07 17:30 Arnaud Pouliquen
  2021-06-07 17:30 ` [PATCH 1/4] rpmsg: Introduce rpmsg_create_default_ept function Arnaud Pouliquen
                   ` (5 more replies)
  0 siblings, 6 replies; 16+ messages in thread
From: Arnaud Pouliquen @ 2021-06-07 17:30 UTC (permalink / raw)
  To: Bjorn Andersson, Ohad Ben-Cohen, Mathieu Poirier
  Cc: linux-remoteproc, linux-kernel, linux-stm32, julien.massot,
	arnaud.pouliquen

Purpose:
  Allow the remote processor to instantiate a /dev/rpmsgX interface relying on the NS announcement
  of the "rpmsg-raw" service.
  This patchet is extracted from  the series [1] with rework to add rpmsg_create_default_ept helper.

  
Aim:
  There is no generic sysfs interface based on RPMsg that allows a user application to communicate
  with a remote processor in a simple way.
  The rpmsg_char dev solves a part of this problem by allowing an endpoint to be created on the
  local side. But it does not take advantage of the NS announcement mechanism implemented for some
  backends such as the virtio backend. So it is not possible to probe it from  a remote initiative.
  Extending the char rpmsg device to support NS announcement makes the rpmsg_char more generic.
  By announcing a "rpmg-raw" service, the firmware of a remote processor will be able to
  instantiate a /dev/rpmsgX interface providing to the user application a basic link to communicate
  with it without any knowledge of the rpmsg protocol.

Implementation details:
  - Register a rpmsg driver for the rpmsg_char driver, associated to the "rpmsg-raw" channel service.
  - In case of rpmsg char device instantiated by the rpmsg bus (on NS announcement) manage the 
    channel default endpoint to ensure a stable default endpoint address, for communication with 
    the remote processor.

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]

[1] https://patchwork.kernel.org/project/linux-remoteproc/list/?series=475217
[2] https://patchwork.kernel.org/project/linux-remoteproc/list/?series=483793



Arnaud Pouliquen (4):
  rpmsg: Introduce rpmsg_create_default_ept function
  rpmsg: char: Add possibility to create and reuse default endpoint
  rpmsg: char: Introduce the "rpmsg-raw" channel
  rpmsg: char: Return error if user tries to destroy a default endpoint.

 drivers/rpmsg/rpmsg_char.c | 92 +++++++++++++++++++++++++++++++++++---
 drivers/rpmsg/rpmsg_core.c | 51 +++++++++++++++++++++
 include/linux/rpmsg.h      | 14 ++++++
 3 files changed, 151 insertions(+), 6 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2021-06-22 20:30 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-07 17:30 [PATCH 0/4] rpmsg: char: introduce the rpmsg-raw channel Arnaud Pouliquen
2021-06-07 17:30 ` [PATCH 1/4] rpmsg: Introduce rpmsg_create_default_ept function Arnaud Pouliquen
2021-06-21 22:42   ` Mathieu Poirier
2021-06-07 17:30 ` [PATCH 2/4] rpmsg: char: Add possibility to create and reuse default endpoint Arnaud Pouliquen
2021-06-07 17:30 ` [PATCH 3/4] rpmsg: char: Introduce the "rpmsg-raw" channel Arnaud Pouliquen
2021-06-15 20:01   ` Mathieu Poirier
2021-06-16 12:38     ` Arnaud POULIQUEN
2021-06-17 21:31       ` Mathieu Poirier
2021-06-18 11:35         ` Arnaud POULIQUEN
2021-06-21 22:38           ` Mathieu Poirier
2021-06-22  8:21             ` Arnaud POULIQUEN
2021-06-22 20:30               ` Mathieu Poirier
2021-06-07 17:30 ` [PATCH 4/4] rpmsg: char: Return error if user tries to destroy a default endpoint Arnaud Pouliquen
2021-06-08  9:08 ` [PATCH 0/4] rpmsg: char: introduce the rpmsg-raw channel Julien Massot
2021-06-08 14:26 ` Mathieu Poirier
2021-06-08 15:27   ` Arnaud POULIQUEN

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