Re: [Intel-gfx] [PATCH v3 0/6] Convert the intel iommu driver to the dma-iommu api

From: Logan Gunthorpe
Date: Mon Sep 21 2020 - 11:48:12 EST

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.
>>> 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.