[PATCH 1/1] drm/amdgpu: disable gpu-sched load balance for uvd_enc

[Nirmoy Das]

On hardware with multiple uvd instances, dependent uvd_enc jobs
may get scheduled to different uvd instances. Because uvd_enc
jobs retain hw context, dependent jobs should always run on the
same uvd instance. This patch disables GPU scheduler's load balancer
for a context that binds jobs from the same context to a uvd
instance.

Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index 7cd398d25498..c80d8339f58c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -114,8 +114,10 @@ static int amdgpu_ctx_init_entity(struct amdgpu_ctx *ctx, u32 hw_ip,
 	scheds = adev->gpu_sched[hw_ip][hw_prio].sched;
 	num_scheds = adev->gpu_sched[hw_ip][hw_prio].num_scheds;

+	/* disable load balance if the hw engine retains context among dependent jobs */
 	if (hw_ip == AMDGPU_HW_IP_VCN_ENC ||
 	    hw_ip == AMDGPU_HW_IP_VCN_DEC ||
+	    hw_ip == AMDGPU_HW_IP_UVD_ENC ||
 	    hw_ip == AMDGPU_HW_IP_UVD) {
 		sched = drm_sched_pick_best(scheds, num_scheds);
 		scheds = &sched;
--
2.28.0