linux-kernel - Re: [RESEND PATCH] cdx: fix driver managed dma support

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Date:   Mon, 5 Jun 2023 20:59:02 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     alex.williamson@...hat.com, jgg@...pe.ca,
        linux-kernel@...r.kernel.org, git@....com, harpreet.anand@....com,
        pieter.jansen-van-vuuren@....com, nikhil.agarwal@....com,
        michal.simek@....com
Subject: Re: [RESEND PATCH] cdx: fix driver managed dma support



On 6/5/2023 8:52 PM, Greg KH wrote:
> 
> On Mon, Jun 05, 2023 at 06:40:09PM +0530, Nipun Gupta wrote:
>> The devices on cdx could be bound to drivers with the device
>> DMA managed by kernel drivers or user-space applications.
>> As multiple devices can be placed in the same IOMMU group, the
>> DMA on these devices must either be entirely under kernel control
>> or userspace control. Fix the CDX bus driver to acknowlege the
>> driver_managed_dma flag and call the appropriate iommu APIs.
>>
>> Fixes: 2959ab247061 ("cdx: add the cdx bus driver")
>> Signed-off-by: Nipun Gupta <nipun.gupta@....com>
>> Reported-by: Alex Williamson <alex.williamson@...hat.com>
>> Closes: https://lore.kernel.org/lkml/20230524134831.28dc97e2.alex.williamson@redhat.com/
>> ---
>>
>> I have resend this patch to include fixes, closes and
>> reported by tags. We request that this fix be incorporated
>> into the 6.4 release, along with the inclusion of CDX bus
>> driver support.
> 
> What do you mean by "inclusion of CDX bus driver support"?  What patches
> exactly?

Sorry for the confusion. I mean that CDX bus support would be coming up 
in 6.4 release and this patch (cdx: fix driver managed dma support) is a 
fix for the driver managed dma support in the bus. So if this patch can 
be part of 6.4 release (i.e. added in upcoming rc release/s for 6.4)?

Thanks,
Nipun

> 
> confused,
> 
> greg k-h