ACK: [SRU][Q][PATCH 0/3] Kernel lockup on Lenovo P14s Gen 6 AMD Ryzen AI 7 PRO 350

[Changwei Zou]

Looks good to me. Thanks.
Acked-by: Changwei Zou <changwei.zou at canonical.com>


On 5/25/26 18:42, Aaron Ma wrote:
> BugLink:https://bugs.launchpad.net/bugs/2148538
>
> SRU Justification:
>
> [ Impact ]
> On Lenovo ThinkPad P14s Gen 6 systems with AMD Ryzen AI 7 PRO 350,
> the system can lock up under graphical workloads. Kernel logs show
> the AMDGPU MES ring buffer becoming full and hung task reports
> involving amdgpu_tlb_fence_work.
>
> The issue is caused by commit f3854e04b708 ("drm/amdgpu: attach tlb
> fence to the PTs update") which attaches TLB fences too broadly and
> can flood KIQ/MES TLB invalidation work.
>
> [ Fix ]
> Backport upstream fixes:
> - d967509651601 ("drm/amdgpu: make sure userqs are enabled in userq IOCTLs")
> - 9163fe4d790f (Revert "drm/amdgpu: don't attach the tlb fence for SI")
> - e9f58ff991dd ("drm/amdgpu: rework how we handle TLB fences")
>
> [ Test Plan ]
> 1. Boot the affected Lenovo P14s Gen 6 AMD Ryzen AI 7 PRO 350 system.
> 2. Exercise the graphical workload that previously reproduced the lockup.
> 3. Verify the system remains responsive and dmesg does not show MES ring
>     buffer full or amdgpu_tlb_fence_work hung task messages.
>
> A test kernel with this fix series ran for 12 hours on the affected
> system without reproducing the lockup (LP #2148538 comment #29).
>
> [ Where problems could occur ]
> Regressions could appear as GPU hangs, failed VM updates, TLB flush
> failures, or user queue/KFD workload failures on AMD GPUs.
>
> [ Other Info ]
> Noble linux is not affected (offending commit absent).
> Resolute linux is not affected (fixes already present).
>
> Alex Deucher (2):
>    drm/amdgpu: make sure userqs are enabled in userq IOCTLs
>    drm/amdgpu: rework how we handle TLB fences
>
> Prike Liang (1):
>    Revert "drm/amdgpu: don't attach the tlb fence for SI"
>
>   drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c       | 16 ++++++++++++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h       |  1 +
>   drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c |  6 ++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c          |  9 ++++++---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h          |  2 ++
>   5 files changed, 31 insertions(+), 3 deletions(-)
>
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