Re: Kernel 6.7 regression doesn't boot if using AMD eGPU

[Bagas Sanjaya <bagasdotme@gmail.com>]

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On Sat, Apr 13, 2024 at 06:04:12PM -0400, Eric Wagner wrote:
> 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.

> Bisecting: 366 revisions left to test after this (roughly 9 steps)
> [74e9347ebc5be452935fe4f3eddb150aa5a6f4fe] Merge tag 'loongarch-fixes-6.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
> Bisecting: 182 revisions left to test after this (roughly 8 steps)
> [f6176471542d991137543af2ef1c18dae3286079] Merge tag 'mtd/fixes-for-6.6-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux
> Bisecting: 87 revisions left to test after this (roughly 7 steps)
> [fe3cfe869d5e0453754cf2b4c75110276b5e8527] Merge tag 'phy-fixes-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy
> Bisecting: 43 revisions left to test after this (roughly 6 steps)
> [c76c067e488ccd55734c3e750799caf2c5956db6] s390/pci: Use dma-iommu layer
> Bisecting: 27 revisions left to test after this (roughly 5 steps)
> [aa5cabc4ce8e6b45d170d162dc54b1bac1767c47] Merge tag 'arm-smmu-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into arm/smmu
> Bisecting: 14 revisions left to test after this (roughly 4 steps)
> [bbc70e0aec287e164344b1a071bd46466a4f29b3] iommu/dart: Remove the force_bypass variable
> Bisecting: 9 revisions left to test after this (roughly 3 steps)
> [e82c175e63229ea495a0a0b5305a98b5b6ee5346] Revert "iommu/vt-d: Remove unused function"
> Bisecting: 5 revisions left to test after this (roughly 2 steps)
> [92bce97f0c341d3037b0f364b6839483f6a41cae] s390/pci: Fix reset of IOMMU software counters
> Bisecting: 3 revisions left to test after this (roughly 2 steps)
> [3613047280ec42a4e1350fdc1a6dd161ff4008cc] Merge tag 'v6.6-rc7' into core
> Bisecting: 2 revisions left to test after this (roughly 1 step)
> [f7da9c081517daba70f9f9342e09d7a6322ba323] iommu/tegra-smmu: Drop unnecessary error check for for debugfs_create_dir()
> Bisecting: 1 revision left to test after this (roughly 1 step)
> [9e13ec61de2a51195b122a79461431d8cb99d7b5] iommu/virtio: Add __counted_by for struct viommu_request and use struct_size()
> Bisecting: 0 revisions left to test after this (roughly 0 steps)
> [6e6c6d6bc6c96c2477ddfea24a121eb5ee12b7a3] iommu: Avoid unnecessary cache invalidations
> e8cca466a84a75f8ff2a7a31173c99ee6d1c59d2 is the first bad commit
> commit e8cca466a84a75f8ff2a7a31173c99ee6d1c59d2
> Merge: 6e6c6d6bc6 f7da9c0815 aa5cabc4ce 9e13ec61de e82c175e63 cedc811c76 3613047280 92bce97f0c
> Author: Joerg Roedel <jroedel@suse.de>
> Date:   Fri Oct 27 09:13:40 2023 +0200
> 
>     Merge branches 'iommu/fixes', 'arm/tegra', 'arm/smmu', 'virtio', 'x86/vt-d', 'x86/amd', 'core' and 's390' into next
> 

Also Cc: regressions ML.

-- 
An old man doll... just what I always wanted! - Clara

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