linux-kernel - Kernel 6.7 regression doesn't boot if using AMD eGPU

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Date: Sat, 13 Apr 2024 18:04:12 -0400
From: Eric Wagner <ewagner12@...il.com>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>, Robin Murphy <robin.murphy@....com>, 
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Kernel 6.7 regression doesn't boot if using AMD eGPU

On my Thinkpad T14s G3 AMD (Ryzen 7 6850U) laptop connected to an AMD RX
580 in Akitio Node Thunderbolt 3 eGPU. Booting with the eGPU connected
hangs on kernels 6.7 and 6.8, but worked on 6.6. For debugging, I find that
adding the kernel parameter amd_iommu=off seems to fix the issue and allows
booting with the eGPU on 6.7.

I tried bisecting the issue between 6.6 and 6.7 and ended up with:
"e8cca466a84a75f8ff2a7a31173c99ee6d1c59d2 is the first bad commit" in the
attached. This seems to indicate an amd iommu issue.

Two others also reported the same issue on AMD Ryzen 7 7840 with AMD RX
6000 connected as eGPU (https://gitlab.freedesktop.org/drm/amd/-/issues/3182
).

Let me know if you need more information.

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