From: Baolu Lu <baolu.lu@linux.intel.com>
To: Mark Pearson <mpearson-lenovo@squebb.ca>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Kevin Tian <kevin.tian@intel.com>
Cc: baolu.lu@linux.intel.com, jani.saarinen@intel.com,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Prevent boot failure with devices requiring ATS
Date: Thu, 5 Sep 2024 11:45:55 +0800 [thread overview]
Message-ID: <97bc177f-49ba-48cc-9dd3-37f79b1432b6@linux.intel.com> (raw)
In-Reply-To: <0dc9ac00-1148-4c64-8c12-4d08a2a27429@app.fastmail.com>
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@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
prev parent reply other threads:[~2024-09-05 3:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-04 6:07 [PATCH 1/1] iommu/vt-d: Prevent boot failure with devices requiring ATS Lu Baolu
2024-09-04 6:49 ` Tian, Kevin
2024-09-04 7:49 ` Baolu Lu
2024-09-04 8:17 ` Tian, Kevin
2024-09-05 2:49 ` Baolu Lu
2024-09-05 4:24 ` Ethan Zhao
2024-09-04 18:00 ` Mark Pearson
2024-09-05 3:45 ` Baolu Lu [this message]
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