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

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Message-ID: <439f17ab-bd7d-6415-bc02-d570c1288f11@nxp.com>
Date:   Wed, 27 Jan 2021 16:06:56 +0200
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Ioana Ciornei <ciorneiioana@...il.com>
Cc:     linux-kernel@...r.kernel.org, Ioana Ciornei <ioana.ciornei@....com>
Subject: Re: [PATCH 0/5] bus: fsl-mc: add userspace support



On 1/27/2021 4:02 PM, Greg KH wrote:
> On Thu, Jan 14, 2021 at 07:07:47PM +0200, 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://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.org%2Flkml%2F2018%2F11%2F20%2F1162&amp;data=04%7C01%7Claurentiu.tudor%40nxp.com%7C8d74c7b04f864d17419508d8c2cc3e10%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637473529759283328%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=kDWLNqq91k5LW74jgZ%2Blu%2FZJfCmeLUZm5DccUiS4m94%3D&amp;reserved=0
>>
>> 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.
> 

Sorry, got caught with other things and forgot about it. Done.

---
Thanks & Best Regards, Laurentiu