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drm/i915/gvt: stop scheduling workload when vgpu is inactive 

There is one corner case that workload_thread may pick and dispatch one
workload of vgpu after it's already deactivated. Below is the scenario:

1. deactive_vgpu got the vgpu_lock, it found pending workload was
submitted, then it released the vgpu_lock and wait for vgpu idle.
2. before deactive_vgpu got the vgpu_lock back, workload_thread might pick
one new valid workload, then it was blocked by the vgpu_lock.
3. deactive_vgpu got the vgpu_lock again, finished the last processes of
deactivating, then release the vgpu_lock.
4. workload_thread got the vgpu_lock, then it will try to dispatch the
fetched workload. It's not expected one workload of deactivated vgpu is
dispatched.

The solution is to add condition check of the vgpu's active flag and stop
to schedule when it's inactive.

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Weinan Li <weinan.z.li@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Weinan Li 2019-02-27 15:36:58 +08:00 committed by Zhenyu Wang
parent 1e8b15a198
commit 9f49847732
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gvt/scheduler.c
View File

@ -738,7 +738,8 @@ static struct intel_vgpu_workload *pick_next_workload(
goto out;
}
if (list_empty(workload_q_head(scheduler->current_vgpu, ring_id)))
if (!scheduler->current_vgpu->active ||
list_empty(workload_q_head(scheduler->current_vgpu, ring_id)))
goto out;
/*