[RFC PATCH 2/2] drm/amdgpu: enable gfx wave limiting for high priority compute jobs

[Christian König]

Am 28.01.21 um 15:35 schrieb Nirmoy Das:
> Enable gfx wave limiting for gfx jobs before pushing high priority
> compute jobs so that high priority compute jobs gets more resources
> to finish early.

The problem here is what happens if you have multiple high priority jobs 
running at the same time?

Christian

>
> Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> index 024d0a563a65..ee48989dfb4c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> @@ -195,6 +195,10 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>   	if ((ib->flags & AMDGPU_IB_FLAG_EMIT_MEM_SYNC) && ring->funcs->emit_mem_sync)
>   		ring->funcs->emit_mem_sync(ring);
>   
> +	if (ring->funcs->emit_wave_limit && job &&
> +	    job->base.s_priority >= DRM_SCHED_PRIORITY_HIGH)
> +		ring->funcs->emit_wave_limit(ring, true);
> +
>   	if (ring->funcs->insert_start)
>   		ring->funcs->insert_start(ring);
>   
> @@ -295,6 +299,11 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>   	ring->current_ctx = fence_ctx;
>   	if (vm && ring->funcs->emit_switch_buffer)
>   		amdgpu_ring_emit_switch_buffer(ring);
> +
> +	if (ring->funcs->emit_wave_limit && job &&
> +	    job->base.s_priority >= DRM_SCHED_PRIORITY_HIGH)
> +		ring->funcs->emit_wave_limit(ring, false);
> +
>   	amdgpu_ring_commit(ring);
>   	return 0;
>   }