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SubjectRe: [Intel-gfx] [PATCH v3 0/6] Convert the intel iommu driver to the dma-iommu api
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Hi Logan,

On 9/21/20 11:48 PM, Logan Gunthorpe wrote:
>
>
> On 2020-09-20 12:36 a.m., Lu Baolu wrote:
>> Hi Logan,
>>
>> On 2020/9/19 4:47, Logan Gunthorpe wrote:
>>> Hi Lu,
>>>
>>> On 2020-09-11 9:21 p.m., Lu Baolu wrote:
>>>> Tom Murphy has almost done all the work. His latest patch series was
>>>> posted here.
>>>>
>>>> https://lore.kernel.org/linux-iommu/20200903201839.7327-1-murphyt7@tcd.ie/
>>>>
>>>> Thanks a lot!
>>>>
>>>> This series is a follow-up with below changes:
>>>>
>>>> 1. Add a quirk for the i915 driver issue described in Tom's cover
>>>> letter.
>>>> 2. Fix several bugs in patch "iommu: Allow the dma-iommu api to use
>>>> bounce buffers" to make the bounce buffer work for untrusted devices.
>>>> 3. Several cleanups in iommu/vt-d driver after the conversion.
>>>>
>>>
>>> I'm trying to test this on an old Sandy Bridge, but found that I get
>>> spammed with warnings on boot. I've put a sample of a few of them below.
>>> They all seem to be related to ioat.
>>>
>>> I had the same issue with Tom's v2 but never saw this on his v1.
>>
>> Have you verified whether this could be reproduced with the lasted
>> upstream kernel (without this patch series)?
>
> Yes.

I am sorry. Just want to make sure I understand you correctly. :-) When
you say "yes", do you mean you could reproduce this with pure upstream
kernel (5.9-rc6)?

> Also, it's hitting a warning in the dma-iommu code which would not
> be hit without this patch set.

Without this series, DMA APIs don't go through dma-iommu. Do you mind
posting the warning message?

Best regards,
baolu

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