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

[Koba Ko]

Dear Baolu,
On Tue, Jun 30, 2020 at 3:52 PM Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote:
>
> 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
>
Sorry for disturbing,
Do you have any updates for this issue?!
https://bugzilla.kernel.org/show_bug.cgi?id=208363

Koba KO