Re: [PATCH 1/1] iommu/vt-d: Prevent boot failure with devices requiring ATS

[Baolu Lu]

On 9/5/24 2:00 AM, Mark Pearson wrote:
> Hi Lu,
>
> Tested this on an X1 Carbon G12 with a kernel built form drm-tip and this patch - and was able to boot successfully with pci=noats
>
> Tested-by: Mark Pearson<mpearson-lenovo@xxxxxxxxx>

Thank you!

> Mark
>
> PS - note on small typo below.
>
> On Wed, Sep 4, 2024, at 2:07 AM, Lu Baolu wrote:
> > SOC-integrated devices on some platforms require their PCI ATS enabled
> > for operation when the IOMMU is in scalable mode. Those devices are
> > reported via ACPI/SATC table with the ATC_REQUIRED bit set in the Flags
> > field.
> >
> > The PCI subsystem offers the 'pci=noats' kernel command to disable PCI
> > ATS on all devices. Using 'pci=noat' with devices that require PCI ATS
> pci=noats

Fixed.

Thanks,
baolu