[PATCH] drm/amdgpu: Improve MES responsiveness during oversubscription

[Kasiviswanathan, Harish]

[AMD Official Use Only - General]

Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan at amd.com>

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Jay Cornwall
Sent: Wednesday, October 4, 2023 12:00 PM
To: amd-gfx at lists.freedesktop.org
Cc: Cornwall, Jay <Jay.Cornwall at amd.com>; Tudor, Alexandru <Alexandru.Tudor at amd.com>
Subject: [PATCH] drm/amdgpu: Improve MES responsiveness during oversubscription

When MES is oversubscribed it may not frequently check for new
command submissions from driver if the scheduling load is high.
Response latency as high as 5 seconds has been observed.

Enable a flag which adds a check for new commands between
scheduling quantums.

Signed-off-by: Jay Cornwall <jay.cornwall at amd.com>
Cc: Alexandru Tudor <alexandru.tudor at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/mes_v11_0.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
index 4a3020b5b30f..31b26e6f0b30 100644
--- a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
@@ -406,6 +406,7 @@ static int mes_v11_0_set_hw_resources(struct amdgpu_mes *mes)
        mes_set_hw_res_pkt.disable_mes_log = 1;
        mes_set_hw_res_pkt.use_different_vmid_compute = 1;
        mes_set_hw_res_pkt.enable_reg_active_poll = 1;
+       mes_set_hw_res_pkt.enable_level_process_quantum_check = 1;
        mes_set_hw_res_pkt.oversubscription_timer = 50;

        return mes_v11_0_submit_pkt_and_poll_completion(mes,
--
2.25.1