Re: [Issue]platform/x86: iommu: System can't shutdown because iommu driver keeps checking the status of DMA_GSTS_TES

[Lu Baolu]

Hi Koba,

On 2020/6/30 15:31, Koba Ko wrote:
> On Mon, Jun 15, 2020 at 3:20 PM Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> 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!?

We're still investigating this issue. If we find out more, I'll let you
know. Thanks a lot for the reporting.

Best regards,
baolu