drm/amdgpu: Enable MES to handle doorbell ring on unmapped queue

On MES12, HW can monitor up to 2048 doorbells that not be
mapped currently and trigger the interrupt to MES when these unmapped
doorbell been ringed.

Signed-off-by: shaoyunl <shaoyun.liu@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mes_v12_0.c

@@ -454,6 +454,27 @@ static void mes_v12_0_init_aggregated_doorbell(struct amdgpu_mes *mes)
 	WREG32_SOC15(GC, 0, regCP_HQD_GFX_CONTROL, data);
 }
 
+
+static void mes_v12_0_enable_unmapped_doorbell_handling(
+		struct amdgpu_mes *mes, bool enable)
+{
+	struct amdgpu_device *adev = mes->adev;
+	uint32_t data = RREG32_SOC15(GC, 0, regCP_UNMAPPED_DOORBELL);
+
+	/*
+	 * The default PROC_LSB settng is 0xc which means doorbell
+	 * addr[16:12] gives the doorbell page number. For kfd, each
+	 * process will use 2 pages of doorbell, we need to change the
+	 * setting to 0xd
+	 */
+	data &= ~CP_UNMAPPED_DOORBELL__PROC_LSB_MASK;
+	data |= 0xd <<  CP_UNMAPPED_DOORBELL__PROC_LSB__SHIFT;
+
+	data |= (enable ? 1 : 0) << CP_UNMAPPED_DOORBELL__ENABLE__SHIFT;
+
+	WREG32_SOC15(GC, 0, regCP_UNMAPPED_DOORBELL, data);
+}
+
 static const struct amdgpu_mes_funcs mes_v12_0_funcs = {
 	.add_hw_queue = mes_v12_0_add_hw_queue,
 	.remove_hw_queue = mes_v12_0_remove_hw_queue,
@@ -1233,6 +1254,9 @@ static int mes_v12_0_hw_init(void *handle)
 
 	mes_v12_0_init_aggregated_doorbell(&adev->mes);
 
+	/* Enable the MES to handle doorbell ring on unmapped queue */
+	mes_v12_0_enable_unmapped_doorbell_handling(&adev->mes, true);
+
 	r = mes_v12_0_query_sched_status(&adev->mes);
 	if (r) {
 		DRM_ERROR("MES is busy\n");