linux-kernel - [RFC PATCH v4 0/4] remoteproc: restructure the remoteproc VirtIO device

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Date:   Mon, 14 Mar 2022 18:01:22 +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>,
        Rob Herring <robh@...nel.org>, Christoph Hellwig <hch@....de>,
        Stefano Stabellini <stefanos@...inx.com>,
        Bruce Ashfield <bruce.ashfield@...inx.com>,
        <arnaud.pouliquen@...s.st.com>
Subject: [RFC PATCH v4 0/4] remoteproc: restructure the remoteproc VirtIO device

Update from V3 [1]:
Minor updates based on Mathieu's comments.
Updates are listed in the commit message of each patch.

[1] https://lkml.org/lkml/2022/1/26/799

Patchset description:

This series is a part of the work initiated a long time ago in 
the series "remoteproc: Decorelate virtio from core"[2]

Objective of the work:
- Update the remoteproc VirtIO device creation (use platform device)
- Allow to declare remoteproc VirtIO device in DT
    - declare resources associated to a remote proc VirtIO
    - declare a list of VirtIO supported by the platform.
- Prepare the enhancement to more VirtIO devices (e.g I2C, audio, video, ...).
  For instance be able to declare a I2C device in a virtio-i2C node.
- Keep the legacy working!
- Try to improve the picture about concerns reported by Christoph Hellwing [3][4]

[2] https://lkml.org/lkml/2020/4/16/1817
[3] https://lkml.org/lkml/2021/6/23/607
[4] https://patchwork.kernel.org/project/linux-remoteproc/patch/AOKowLclCbOCKxyiJ71WeNyuAAj2q8EUtxrXbyky5E@cp7-web-042.plabs.ch/

In term of device tree this would result in such hiearchy (stm32mp1 example with 2 virtio RPMSG):

	m4_rproc: m4@...00000 {
		compatible = "st,stm32mp1-m4";
		reg = <0x10000000 0x40000>,
		      <0x30000000 0x40000>,
		      <0x38000000 0x10000>;
        memory-region = <&retram>, <&mcuram>,<&mcuram2>;
        mboxes = <&ipcc 2>, <&ipcc 3>;
        mbox-names = "shutdown", "detach";
        status = "okay";

        #address-cells = <1>;
        #size-cells = <0>;
        
        vdev@0 {
		compatible = "rproc-virtio";
		reg = <0>;
		virtio,id = <7>;  /* RPMSG */
		memory-region = <&vdev0vring0>, <&vdev0vring1>, <&vdev0buffer>;
		mboxes = <&ipcc 0>, <&ipcc 1>;
		mbox-names = "vq0", "vq1";
		status = "okay";
        };

        vdev@1 {
		compatible = "rproc-virtio";
		reg = <1>;
		virtio,id = <7>;  /*RPMSG */
		memory-region = <&vdev1vring0>, <&vdev1vring1>, <&vdev1buffer>;
		mboxes = <&ipcc 4>, <&ipcc 5>;
		mbox-names = "vq0", "vq1";
		status = "okay";
        };
};

I have divided the work in 4 steps to simplify the review, This series implements only
the step 1:
step 1:  redefine the remoteproc VirtIO device as a platform device
  - migrate rvdev management in remoteproc virtio.c,
  - create a remotproc virtio config ( can be disabled for platform that not use VirtIO IPC.
step 2: add possibility to declare and probe a VirtIO sub node
  - VirtIO bindings declaration,
  - multi DT VirtIO devices support,
  - introduction of a remote proc virtio bind device mechanism ,
=> https://github.com/arnopo/linux/commits/step2-virtio-in-DT
step 3: Add memory declaration in VirtIO subnode
=> https://github.com/arnopo/linux/commits/step3-virtio-memories
step 4: Add mailbox declaration in VirtIO subnode
=> https://github.com/arnopo/linux/commits/step4-virtio-mailboxes

Arnaud Pouliquen (4):
  remoteproc: core: Introduce virtio device add/remove functions
  remoteproc: core: Introduce rproc_register_rvdev function
  remoteproc: Move rproc_vdev management to remoteproc_virtio.c
  remoteproc: virtio: Create platform device for the remoteproc_virtio

 drivers/remoteproc/remoteproc_core.c     | 154 +++---------------
 drivers/remoteproc/remoteproc_internal.h |  23 ++-
 drivers/remoteproc/remoteproc_virtio.c   | 193 ++++++++++++++++++++---
 include/linux/remoteproc.h               |   6 +-
 4 files changed, 215 insertions(+), 161 deletions(-)

-- 
2.25.1