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

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Date:   Tue, 26 Sep 2023 18:36:38 +0530
From:   "Gupta, Nipun" <nipun.gupta@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
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 9/26/2023 3:25 PM, Greg KH wrote:
> 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 for quick response and sorry for prodding. I will check with 
Thomas/Marc for their feedback.

Regards,
Nipun

> 
> thanks,
> 
> greg k-h