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Date:   Fri, 21 Aug 2020 16:43:27 +0200
From:   Joerg Roedel <jroedel@suse.de>
To:     Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc:     iommu@lists.linux-foundation.org,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [Regression] "iommu/amd: Relax locking in dma_ops path" makes
 tg3 ethernet transmit queue timeout
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On Fri, Aug 21, 2020 at 09:50:33PM +0800, Kai-Heng Feng wrote:
> Of course, I still have the system at my side.
> 
> The offending commit is 92d420ec028d ("iommu/amd: Relax locking in
> dma_ops path"), however be62dbf554c5 ("iommu/amd: Convert AMD iommu
> driver to the dma-iommu api") removed .map_page entirely so I don't
> know where to start.

I guess you don't see any AMD-Vi page-faults reported in dmesg, right?
That makes things more difficult. As a first step, can you please send
me a complete dmesg after this happened? Also please boot with
amd_iommu_dump on the kernel command line.

Regards,

	Joerg