linux-kernel - Re: [PATCH v2] cdx: add MSI support for CDX bus

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Date:   Tue, 6 Jun 2023 16:32:51 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     gregkh@...uxfoundation.org, maz@...nel.org, tglx@...utronix.de,
        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
Subject: Re: [PATCH v2] cdx: add MSI support for CDX bus



On 5/18/2023 5:14 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>
> ---
> 
> Changes v1->v2:
> - fixed scenario where msi write was called asyncronously in
>    an atomic context, by using irq_chip_(un)lock, and using sync
>    MCDI API for write MSI message.
> - fixed broken Signed-off-by chain.

Hi Thomas,

Did you had a chance to look at patch v2. Please let me know in case 
anything else is required to be updated.

Thanks,
Nipun