Messages in this thread | | | Date | Fri, 24 Jul 2020 14:34:20 +0200 | From | Joerg Roedel <> | Subject | Re: [PATCH v2 1/1] iommu/vt-d: Skip TE disabling on quirky gfx dedicated iommu |
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On Thu, Jul 23, 2020 at 09:34:37AM +0800, Lu Baolu wrote: > The VT-d spec requires (10.4.4 Global Command Register, TE field) that: > > Hardware implementations supporting DMA draining must drain any in-flight > DMA read/write requests queued within the Root-Complex before completing > the translation enable command and reflecting the status of the command > through the TES field in the Global Status register. > > Unfortunately, some integrated graphic devices fail to do so after some > kind of power state transition. As the result, the system might stuck in > iommu_disable_translation(), waiting for the completion of TE transition. > > This provides a quirk list for those devices and skips TE disabling if > the qurik hits. > > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=208363 > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=206571 > Tested-by: Koba Ko <koba.ko@canonical.com> > Tested-by: Jun Miao <jun.miao@windriver.com> > Cc: Ashok Raj <ashok.raj@intel.com> > Cc: stable@vger.kernel.org > Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Applied for v5.9, thanks.
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