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

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 Pearsonmpearson-lenovo@squebb.ca

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