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

From: Koba Ko <koba.ko@canonical.com>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
	Joerg Roedel <joro@8bytes.org>,
	iommu@lists.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Kai Heng Feng <kai.heng.feng@canonical.com>,
	"Raj, Ashok" <ashok.raj@intel.com>,
	"Sun, Jian" <jian.sun@intel.com>
Subject: Re: [Issue]platform/x86: iommu: System can't shutdown because iommu driver keeps checking the status of DMA_GSTS_TES
Date: Tue, 7 Jul 2020 11:27:59 +0800	[thread overview]
Message-ID: <CAJB-X+Uo2yw+SC6X2sfDsG9YusyL9iJAuR0wG_L+KYtSkz=Cmg@mail.gmail.com> (raw)
In-Reply-To: <66cacbab-b04d-33f3-053e-4d554ac7c662@linux.intel.com>

Dear Baolu,
On Tue, Jun 30, 2020 at 3:52 PM Lu Baolu <baolu.lu@linux.intel.com> 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@linux.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!?
> >
>
> 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