drm/amdgpu/gfx11: add priv-fault user-queue recovery worker

A gfx user-queue priv/bad-op fault is raised by the ME and carries only
the HW slot, not the faulting queue's doorbell. Add a per-IP worker that
drains adev->gfx.userq_priv_fault_slots, reads the doorbell back from each
HQD via soc21_grbm_select (regCP_RB_DOORBELL_CONTROL), looks up the user
queue and kicks its per-queue reset.

The shared amdgpu_gfx_handle_priv_fault() helper schedules this worker for
a gfx user-queue fault; wiring the helper up is done in a later patch.

v2:
 - gate on adev->gfx.disable_uq instead of !adev->enable_mes (Alex)
 - document why both the doorbell (compute) and HW-slot (gfx) reset
   paths are needed (Alex)

v3:
 - rebase amd-staging-drm-next. adapt to the commit 9243cf4777fc ("drm/amd/amdgpu: remove duplicated code in gfx_v11 and gfx_v12"); no functional change

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Suggested-by: Mario Sopena-Novales <Mario.Novales@amd.com>
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions