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

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Message-ID: <51b6606a-fdc1-de11-2260-863ac08071fd@amd.com>
Date:   Thu, 5 Oct 2023 20:07:35 +0530
From:   "Gupta, Nipun" <nipun.gupta@....com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     maz@...nel.org, 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

Hi Greg,

On 10/5/2023 7:30 PM, Greg KH wrote:
> On Thu, Oct 05, 2023 at 03:46:34PM +0200, Thomas Gleixner wrote:
>> On Thu, Oct 05 2023 at 12:24, Greg KH wrote:
>>>> diff --git a/drivers/cdx/Kconfig b/drivers/cdx/Kconfig
>>>> index a08958485e31..86df7ccb76bb 100644
>>>> --- a/drivers/cdx/Kconfig
>>>> +++ b/drivers/cdx/Kconfig
>>>> @@ -8,6 +8,7 @@
>>>>   config CDX_BUS
>>>>   	bool "CDX Bus driver"
>>>>   	depends on OF && ARM64
>>>> +	select GENERIC_MSI_IRQ_DOMAIN
>>>
>>> This config option isn't in my tree anywhere, where did it come from?
>>> What is it supposed to do?
>>
>> 13e7accb81d6 ("genirq: Get rid of GENERIC_MSI_IRQ_DOMAIN") :)
> 
> Ok, so this hasn't been tested since the 6.2 release?  Wow, I think
> someone from AMD needs to take a deep look at this and verify that it
> actually is doing what it is supposed to be doing...

The patch Thomas mentioned renames "GENERIC_MSI_IRQ_DOMAIN" to 
"GENERIC_MSI_IRQ"; and in our testing "GENERIC_MSI_IRQ" is also selected 
as 'ARM64' is enabled which enables 'ARM_GIC_V3_ITS' which in-turn 
selects 'GENERIC_MSI_IRQ'.

The patch is tested for MSI functionality on 6.6-rc1. We will re-look 
into the config dependencies to avoid such issues, but please be assured 
that the patch has been validated.

Thanks,
Nipun

> 
> thanks,
> 
> greg k-h