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From: Eric Wagner <ewagner12@gmail.com>
Date: Sat, 13 Apr 2024 18:04:12 -0400
Message-ID: <CAHudX3zLH6CsRmLE-yb+gRjhh-v4bU5_1jW_xCcxOo_oUUZKYg@mail.gmail.com>
Subject: Kernel 6.7 regression doesn't boot if using AMD eGPU
To: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>, Robin Murphy <robin.murphy@arm.com>, 
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org
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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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<div dir=3D"ltr"><div>On my Thinkpad T14s G3 AMD (Ryzen 7 6850U) laptop con=
nected 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 debugg=
ing, I find that adding the kernel parameter amd_iommu=3Doff seems to fix t=
he issue and allows booting with the eGPU on 6.7.</div><div><br></div>I tri=
ed bisecting the issue between 6.6 and 6.7 and ended up with: &quot;e8cca46=
6a84a75f8ff2a7a31173c99ee6d1c59d2 is the first bad commit&quot; in the atta=
ched. This seems to indicate an amd iommu issue.<br><br><div>Two others als=
o reported the same issue on AMD Ryzen 7 7840 with AMD RX 6000 connected as=
 eGPU (<a href=3D"https://gitlab.freedesktop.org/drm/amd/-/issues/3182">htt=
ps://gitlab.freedesktop.org/drm/amd/-/issues/3182</a>).</div><div><br></div=
><div>Let me know if you need more information.<br></div></div>

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