linux-kernel - Re: [PATCH v8 1/2] cdx: add MSI support for CDX bus

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Message-ID: <87y1bbcxvq.ffs@tglx>
Date: Fri, 23 Feb 2024 10:50:49 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Nipun Gupta <nipun.gupta@....com>, gregkh@...uxfoundation.org,
 maz@...nel.org, jgg@...pe.ca, linux-kernel@...r.kernel.org
Cc: git@....com, harpreet.anand@....com, pieter.jansen-van-vuuren@....com,
 nikhil.agarwal@....com, michal.simek@....com, abhijit.gangurde@....com,
 srivatsa@...il.mit.edu, Nipun Gupta <nipun.gupta@....com>
Subject: Re: [PATCH v8 1/2] cdx: add MSI support for CDX bus

On Fri, Feb 23 2024 at 14:54, Nipun Gupta wrote:

> Add CDX-MSI domain per CDX controller with gic-its domain as
> a parent, to support MSI for CDX devices. CDX devices allocate
> MSIs from the CDX domain. Also, introduce APIs to alloc and free
> IRQs for CDX domain.
>
> In CDX subsystem firmware is a controller for all devices and
> their configuration. CDX bus controller sends all the write_msi_msg
> commands to firmware running on RPU and the firmware interfaces with
> actual devices to pass this information to devices
>
> Since, CDX controller is the only way to communicate with the Firmware
> for MSI write info, CDX domain per controller required in contrast to
> having a CDX domain per device.
>
> Co-developed-by: Nikhil Agarwal <nikhil.agarwal@....com>
> Signed-off-by: Nikhil Agarwal <nikhil.agarwal@....com>
> Co-developed-by: Abhijit Gangurde <abhijit.gangurde@....com>
> Signed-off-by: Abhijit Gangurde <abhijit.gangurde@....com>
> Signed-off-by: Nipun Gupta <nipun.gupta@....com>
> Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
> Tested-by: Nikhil Agarwal <nikhil.agarwal@....com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>