Re: [PATCH v2] drm/amdgpu: fix recursive ww_mutex acquire in amdgpu_devcoredump_format

[Mikhail Gavrilov]

On Wed, May 20, 2026 at 12:08 PM Christian König
<christian.koenig@xxxxxxx> wrote:
>
> That whole infrastructure is superflous. You just need to modify amdgpu_vm_lock_by_pasid() to take a drm_exec object to lock the root BO.
>

Christian, modifying amdgpu_vm_lock_by_pasid() to take a drm_exec turns
out to also require converting its other caller, amdgpu_vm_handle_fault(),
to drm_exec — most of the diff is that conversion, not the helper itself.

I can:
 (a) convert both in a 2-patch series (handle_fault becomes
     drm_exec_init + drm_exec_until_all_locked + drm_exec_fini, ~30 lines),
     or
 (b) keep the loop inside amdgpu_vm_lock_by_pasid() so handle_fault stays
     a one-liner — but then the devcoredump caller can't add the IB BOs
     to the same ticket, which is the whole point.

(a) seems unavoidable if we want one helper. Is that what you had in mind,
or did you intend something lighter — e.g. a separate
amdgpu_vm_lock_by_pasid_exec() leaving handle_fault untouched?

-- 
Best Regards,
Mike Gavrilov.