[Regression] "iommu/amd: Relax locking in dma_ops path" makes tg3 ethernet transmit queue timeout

Kai-Heng Feng kai.heng.feng at canonical.com
Mon May 18 14:05:33 UTC 2020

> On May 18, 2020, at 21:32, Joerg Roedel <jroedel at suse.de> wrote:
> On Mon, May 18, 2020 at 05:06:45PM +0800, Kai-Heng Feng wrote:
>> Particularly, as soon as the spinlock is removed, the issue can be reproduced.
>> Function domain_flush_complete() doesn't seem to affect the status.
>> However, the .map_page callback was removed by be62dbf554c5
>> ("iommu/amd: Convert AMD iommu driver to the dma-iommu api"), so
>> there's no easy revert for this issue.
>> This is still reproducible as of today's mainline kernel, v5.7-rc6.
> Is there any error message from the IOMMU driver?

As of mainline kernel, there's no error message from IOMMU driver.
There are some complains from v4.15-rc1:


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