linux-kernel - Re: [PATCH 0/5] bus: fsl-mc: add userspace support

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Date:   Wed, 27 Jan 2021 16:05:13 +0200
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Ioana Ciornei <ciorneiioana@...il.com>, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Cc:     Ioana Ciornei <ioana.ciornei@....com>
Subject: Re: [PATCH 0/5] bus: fsl-mc: add userspace support



On 1/14/2021 7:07 PM, Ioana Ciornei wrote:
> From: Ioana Ciornei <ioana.ciornei@....com>
> 
> This patch set adds userspace support in the fsl-mc bus along with a
> rescan attribute to the root DPRC container. An earlier discussion on
> this functionality can be found at the link below. I didn't continue
> with the versioning scheme since quite some time has passed since the
> last discussion.
> https://lkml.org/lkml/2018/11/20/1162
> 
> The FSL_MC_SEND_MC_COMMAND ioctl acts as a direct passthrough to the
> Management Complex (or MC) by passing fixed-length command/response
> pairs. Keeping in mind that the MC manages DPAA2 hardware resources and
> provides and object-based abstraction for sofware drivers, the proposed
> ioctl interface enables userspace tools to do the following: 
>  - Get layout information about the available resources abstracted and
>    exported by the Management Complex firmware. This is especially
>    useful to generate a complete description of the current hardware
>    resource partitioning.
>  - Manage DPAA2 objects lifecycle (create, destroy) and establish
>    connection between different components as needed.
> 
> The ioctl interface is intended for dynamic usecases where DPAA2 objects
> need to be created on demand or destroyed so that the underlying
> hardware resources can be further repurposed. In static usecases,
> depending on the requirements, a firmware configuration file can be used
> to describe the needed DPAA2 objects, their attributes or any link
> between them.
> 
> Each command received through the ioctl interface is first checked
> against a list of accepted MC commands. Also, commands which would alter
> the hardware resource management require CAP_NET_ADMIN.  The command is
> also check so that it does not contain garbage beyond the maximum size
> expected for that command id.
> 
> Ioana Ciornei (5):
>   bus: fsl-mc: move fsl_mc_command struct in a uapi header
>   bus: fsl-mc: export mc_cmd_hdr_read_cmdid() to the fsl-mc bus
>   bus: fsl-mc: add fsl-mc userspace support
>   bus: fsl-mc: add bus rescan attribute
>   bus: fsl-mc: add autorescan sysfs
> 
>  Documentation/ABI/stable/sysfs-bus-fsl-mc     |  19 +
>  .../userspace-api/ioctl/ioctl-number.rst      |   1 +
>  MAINTAINERS                                   |   2 +
>  drivers/bus/fsl-mc/Kconfig                    |   7 +
>  drivers/bus/fsl-mc/Makefile                   |   3 +
>  drivers/bus/fsl-mc/dprc-driver.c              |  33 +-
>  drivers/bus/fsl-mc/fsl-mc-bus.c               |  96 +++
>  drivers/bus/fsl-mc/fsl-mc-private.h           |  49 ++
>  drivers/bus/fsl-mc/fsl-mc-uapi.c              | 547 ++++++++++++++++++
>  drivers/bus/fsl-mc/mc-sys.c                   |   2 +-
>  include/linux/fsl/mc.h                        |   8 +-
>  include/uapi/linux/fsl_mc.h                   |  34 ++
>  12 files changed, 789 insertions(+), 12 deletions(-)
>  create mode 100644 Documentation/ABI/stable/sysfs-bus-fsl-mc
>  create mode 100644 drivers/bus/fsl-mc/fsl-mc-uapi.c
>  create mode 100644 include/uapi/linux/fsl_mc.h
> 

For the series:

Acked-by: Laurentiu Tudor <laurentiu.tudor@....com>

---
Best Regards, Laurentiu