linux-kernel - Re: [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 15:20:02 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Koba Ko <koba.ko@...onical.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kai Heng Feng <kai.heng.feng@...onical.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Sun, Jian" <jian.sun@...el.com>
Subject: Re: [Issue]platform/x86: iommu: System can't shutdown because iommu
 driver keeps checking the status of DMA_GSTS_TES

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