linux-kernel - [Issue]platform/x86: iommu: System can't shutdown because iommu driver keeps checking the status of DMA_GSTS

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Date:   Mon, 15 Jun 2020 11:46:50 +0800
From:   Koba Ko <koba.ko@...onical.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org,
        Kai Heng Feng <kai.heng.feng@...onical.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [Issue]platform/x86: iommu: System can't shutdown because iommu
 driver keeps checking the status of DMA_GSTS_TES

hi All,
I have a machine and there's only intel gpu.
the secureboot and vt-d is enabled in BIOS.
On the Ubuntu desktop, I do s2idle first and restart the machine.
The machine can't restart successfully, so I need to press the power
button to shutdown.
I tried  each of the following and the issue can't be triggered.
1. disable secure boot in BIOS.
2. intel_iommu=off.
3. intel_iomm=igfx_off.
4. nomodeset
5. i915.modeset=0.

After I investigate further, find inte_iommu keeps checking the status
of DMA_GSTS_TES.
During the procedure of restart, the driver would disable iommu translation and
check the status of DMA_GSTS_TES until status of DMA_GSTS_TES is 0.

If you need more information, I can provide it.

Thanks
Koba Ko