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SubjectRe: [PATCH 0/5] bus: fsl-mc: add userspace support
On Thu, Jan 14, 2021 at 07:07:47PM +0200, Ioana Ciornei wrote:
> From: Ioana Ciornei <ioana.ciornei@nxp.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.

I need an ack from the maintainers here before I can take this series.

thanks,

greg k-h

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