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drm/amdgpu: Force signal hw_fences that are embedded in non-sched jobs
authorYuBiao Wang <YuBiao.Wang@amd.com>
Thu, 16 Mar 2023 03:30:32 +0000 (11:30 +0800)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 23 Mar 2023 13:31:30 +0000 (09:31 -0400)
commit033c56474acf567a450f8bafca50e0b610f2b716
tree066f7492c49b71aaebf13c654f99942be0182382
parent4eb0b49a0ad3e004a6a65b84efe37bc7e66d560f
drm/amdgpu: Force signal hw_fences that are embedded in non-sched jobs

[Why]
For engines not supporting soft reset, i.e. VCN, there will be a failed
ib test before mode 1 reset during asic reset. The fences in this case
are never signaled and next time when we try to free the sa_bo, kernel
will hang.

[How]
During pre_asic_reset, driver will clear job fences and afterwards the
fences' refcount will be reduced to 1. For drm_sched_jobs it will be
released in job_free_cb, and for non-sched jobs like ib_test, it's meant
to be released in sa_bo_free but only when the fences are signaled. So
we have to force signal the non_sched bad job's fence during
pre_asic_reset or the clear is not complete.

Signed-off-by: YuBiao Wang <YuBiao.Wang@amd.com>
Acked-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c