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

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Message-ID: <97bc177f-49ba-48cc-9dd3-37f79b1432b6@linux.intel.com>
Date: Thu, 5 Sep 2024 11:45:55 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Mark Pearson <mpearson-lenovo@...ebb.ca>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Kevin Tian <kevin.tian@...el.com>
Cc: baolu.lu@...ux.intel.com, jani.saarinen@...el.com, iommu@...ts.linux.dev,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: 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 Pearson<mpearson-lenovo@...ebb.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