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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Message-ID: <CAJB-X+WgjKR3PgoF_tn_g__+agCSGJpyB8sh+A62gs0qztDuVQ@mail.gmail.com>
Date:   Tue, 30 Jun 2020 15:31:52 +0800
From:   Koba Ko <koba.ko@...onical.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        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

On Mon, Jun 15, 2020 at 3:20 PM Lu Baolu <baolu.lu@...ux.intel.com> wrote:
>
> 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
Hi Baolu,
Sorry, i missed your email.
I'm running on TGL.
My colleague has reported this on bugzilla.
Have tested your patch and it works fine.
https://bugzilla.kernel.org/show_bug.cgi?id=208363

Could you explain more about these patches!? Why do we need  a flag
for active iommu!?

Koba Ko