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To:     Lu Baolu <baolu.lu@linux.intel.com>,
        Joerg Roedel <joro@8bytes.org>, Tom Murphy <murphyt7@tcd.ie>,
        David Woodhouse <dwmw2@infradead.org>,
        Christoph Hellwig <hch@infradead.org>
Cc:     Ashok Raj <ashok.raj@intel.com>, Intel-gfx@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org
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From:   Logan Gunthorpe <logang@deltatee.com>
Message-ID: <e95a55ea-b03f-4b3c-327a-b48d364577e9@deltatee.com>
Date:   Mon, 21 Sep 2020 09:48:06 -0600
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Subject: Re: [Intel-gfx] [PATCH v3 0/6] Convert the intel iommu driver to the
 dma-iommu api
Precedence: bulk


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

Thanks,

Logan