[PATCH 10/16] drm/amdgpu/gfx9: rework kernel queue priority handling

[Alex Deucher <alexander.deucher@amd.com>]

Rather than setting a higher queue priority which could
starve a lower priority queue, enable longer quantums
for high priority kernel queues. This will avoid
starvation, but provide longer runtime for high priority
queues.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 2eb32f92a77c4..aaf75c82b1bf5 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3670,7 +3670,10 @@ static int gfx_v9_0_mqd_init(struct amdgpu_ring *ring)
 	tmp = RREG32_SOC15(GC, 0, mmCP_HQD_QUANTUM);
 	tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_EN, 1);
 	tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_SCALE, 1);
-	tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_DURATION, 1);
+	if (amdgpu_gfx_is_high_priority_compute_queue(adev, ring))
+		tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_DURATION, 2);
+	else
+		tmp = REG_SET_FIELD(tmp, CP_HQD_QUANTUM, QUANTUM_DURATION, 1);
 	mqd->cp_hqd_quantum = tmp;
 
 	/* map_queues packet doesn't need activate the queue,
-- 
2.53.0