Hi Mario On Fri, Jul 10, 2020 at 4:58 AM Limonciello, Mario <mario.limoncie...@dell.com> wrote: > > > -----Original Message----- > > From: iommu <iommu-boun...@lists.linux-foundation.org> On Behalf Of Koba Ko > > Sent: Sunday, June 14, 2020 10:47 PM > > To: David Woodhouse; Lu Baolu; Joerg Roedel > > Cc: iommu@lists.linux-foundation.org; Kai Heng Feng; Linux Kernel Mailing > > List > > Subject: [Issue]platform/x86: iommu: System can't shutdown because iommu > > driver keeps checking the status of DMA_GSTS_TES > > > > 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. > > Just to explain why this happens, on many of Dell's systems VT-d is only > enabled > when secure boot is enabled. > > > 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 the status of DMA_GSTS_TES until status of DMA_GSTS_TES is 0. > > > > If you need more information, I can provide it. > > > > Thanks > > Koba Ko > > _______________________________________________ > > iommu mailing list > > iommu@lists.linux-foundation.org > > https://lists.linuxfoundation.org/mailman/listinfo/iommu > > This is reported on TGL pre-production system, but actually same symptom is > also > happening in ICL production systems such as XPS 7390 2-in-1 and XPS 9300. > > Details for the ICL issue are available here: > https://bugzilla.kernel.org/show_bug.cgi?id=206571 > > A user did bisect it back to commit 6c3a44ed3c553c324845744f30bcd1d3b07d61fd > in > 5.5. Glancing through the code and comparing the suspend case, I would ask > is it > just a case of missing a flush at shutdown (IE iommu_flush_all)? > If dma translation doesn't be disabled during shutdown, the machine would be powered off successfully. I have tried to flush before disabled and this can't affect the result of the issue.
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