linux-kernel - Re: [PATCH v4 0/7] Convert the intel iommu driver to the dma-iommu api

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Date:   Mon, 2 Nov 2020 11:52:12 +0000
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, Tom Murphy <murphyt7@....ie>,
        David Woodhouse <dwmw2@...radead.org>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Ashok Raj <ashok.raj@...el.com>, Intel-gfx@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/7] Convert the intel iommu driver to the dma-iommu
 api


On 02/11/2020 02:00, Lu Baolu wrote:
> Hi Tvrtko,
> On 10/12/20 4:44 PM, Tvrtko Ursulin wrote:
>>
>> On 29/09/2020 01:11, Lu Baolu wrote:
>>> Hi Tvrtko,
>>>
>>> On 9/28/20 5:44 PM, Tvrtko Ursulin wrote:
>>>>
>>>> On 27/09/2020 07:34, Lu Baolu wrote:
>>>>> Hi,
>>>>>
>>>>> The previous post of this series could be found here.
>>>>>
>>>>> https://lore.kernel.org/linux-iommu/20200912032200.11489-1-baolu.lu@linux.intel.com/ 
>>>>>
>>>>>
>>>>> This version introduce a new patch [4/7] to fix an issue reported 
>>>>> here.
>>>>>
>>>>> https://lore.kernel.org/linux-iommu/51a1baec-48d1-c0ac-181b-1fba92aa428d@linux.intel.com/ 
>>>>>
>>>>>
>>>>> There aren't any other changes.
>>>>>
>>>>> Please help to test and review.
>>>>>
>>>>> Best regards,
>>>>> baolu
>>>>>
>>>>> Lu Baolu (3):
>>>>>    iommu: Add quirk for Intel graphic devices in map_sg
>>>>
>>>> Since I do have patches to fix i915 to handle this, do we want to 
>>>> co-ordinate the two and avoid having to add this quirk and then 
>>>> later remove it? Or you want to go the staged approach?
>>>
>>> I have no preference. It depends on which patch goes first. Let the
>>> maintainers help here.
>>
>> FYI we have merged the required i915 patches to out tree last week or 
>> so. I *think* this means they will go into 5.11. So the i915 specific 
>> workaround patch will not be needed in Intel IOMMU.
> 
> Do you mind telling me what's the status of this fix patch? I tried this
> series on v5.10-rc1 with the graphic quirk patch dropped. I am still
> seeing dma faults from graphic device.

Hmm back then I thought i915 fixes for this would land in 5.11 so I will 
stick with that. :) (See my quoted text a paragraph above yours.)

Regards,

Tvrtko