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Cc:     baolu.lu@linux.intel.com, iommu@lists.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kai Heng Feng <kai.heng.feng@canonical.com>,
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Subject: Re: [Issue]platform/x86: iommu: System can't shutdown because iommu
 driver keeps checking the status of DMA_GSTS_TES
To:     Koba Ko <koba.ko@canonical.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Joerg Roedel <joro@8bytes.org>
References: <CAJB-X+Ww=bZN2qZ=e=4EkN_RUTiZxHxkdnHh50y9iVqZmT_XQg@mail.gmail.com>
From:   Lu Baolu <baolu.lu@linux.intel.com>
Message-ID: <111dde48-8018-6d74-5df8-1534143f4de6@linux.intel.com>
Date:   Mon, 15 Jun 2020 15:20:02 +0800
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Hi Koba Ko,

On 2020/6/15 11:19, Koba Ko wrote:
> 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 status of DMA_GSTS_TES until status of DMA_GSTS_TES is 0.
> 
> If you need more information, I can provide it.

Do you mind telling what platform is it?

Best regards,
baolu