[PATCH 30/31] drm/amdgpu: Enable unmapped doorbell handling basic mode on mes 12

[Alex Deucher]

From: shaoyunl <shaoyun.liu at amd.com>

Enable basic mode handling for doorbell ring on unmapped CP queue.
In this mode, MES can start schedule the queue mapping based on HW
interrupt instead of timer.

Signed-off-by: shaoyunl <shaoyun.liu at amd.com>
Reviewed-by: Harish Kasiviswanthan <Harish.Kasiviswanthan at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/mes_v12_0.c        | 16 +++++++++++++++-
 drivers/gpu/drm/amd/include/mes_v12_api_def.h |  3 ++-
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
index 2d713e7b976aa..4a041cc22f68a 100644
--- a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
@@ -394,7 +394,14 @@ static int mes_v12_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.oversubscription_timer = 50;
+
+	/*
+	 * No need to enable oversubscribe timer when we have unmapped doorbell
+	 * handling support.
+	 * handling  mode - 0: disabled; 1: basic version; 2: basic+ version
+	 */
+	mes_set_hw_res_pkt.oversubscription_timer = 0;
+	mes_set_hw_res_pkt.unmapped_doorbell_handling = 1;
 
 	return mes_v12_0_submit_pkt_and_poll_completion(mes,
 			&mes_set_hw_res_pkt, sizeof(mes_set_hw_res_pkt),
@@ -831,6 +838,13 @@ static int mes_v12_0_mqd_init(struct amdgpu_ring *ring)
 	mqd->cp_hqd_iq_timer = regCP_HQD_IQ_TIMER_DEFAULT;
 	mqd->cp_hqd_quantum = regCP_HQD_QUANTUM_DEFAULT;
 
+	/*
+	 * Set CP_HQD_GFX_CONTROL.DB_UPDATED_MSG_EN[15] to enable unmapped
+	 * doorbell handling. This is a reserved CP internal register can
+	 * not be accesss by others
+	 */
+	mqd->reserved_184 = BIT(15);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/include/mes_v12_api_def.h b/drivers/gpu/drm/amd/include/mes_v12_api_def.h
index 81cc0a5540492..2cdecf937acef 100644
--- a/drivers/gpu/drm/amd/include/mes_v12_api_def.h
+++ b/drivers/gpu/drm/amd/include/mes_v12_api_def.h
@@ -238,7 +238,8 @@ union MESAPI_SET_HW_RESOURCES {
 				uint32_t send_write_data : 1;
 				uint32_t os_tdr_timeout_override : 1;
 				uint32_t use_rs64mem_for_proc_gang_ctx : 1;
-				uint32_t reserved : 17;
+				uint32_t unmapped_doorbell_handling: 2;
+				uint32_t reserved : 15;
 			};
 			uint32_t uint32_all;
 		};
-- 
2.44.0