linux-kernel - Re: [PATCH v4] cdx: add MSI support for CDX bus

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Message-ID: <2023092602-zen-legal-4910@gregkh>
Date:   Tue, 26 Sep 2023 11:55:17 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Gupta, Nipun" <nipun.gupta@....com>
Cc:     maz@...nel.org, tglx@...utronix.de, jgg@...pe.ca,
        linux-kernel@...r.kernel.org, git@....com, harpreet.anand@....com,
        pieter.jansen-van-vuuren@....com, nikhil.agarwal@....com,
        michal.simek@....com, abhijit.gangurde@....com,
        srivatsa@...il.mit.edu
Subject: Re: [PATCH v4] cdx: add MSI support for CDX bus

On Tue, Sep 26, 2023 at 03:18:58PM +0530, Gupta, Nipun wrote:
> Hi Greg,
> 
> On 9/11/2023 7:22 PM, 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>
> 
> Please help in making progress on this patch. Is there anything that needs
> to be updated in this patch for CDX bus?

$ mdfrm -c ~/mail/todo/
2031 messages in /home/gregkh/mail/todo/

So perhaps help in reviewing other pending patches for other subsystems?
It's in my queue, but have been traveling for 2 weeks for conferences,
will be catching up next week when I get a chance.

Also, you need to get the msi/interrupt developers to agree with this,
why not get their review and acceptance first?

thanks,

greg k-h