drm/amd/pm: Add xgmi plpd to aldebaran pm_policy

On aldebaran, allow changing xgmi plpd policy through
'pm_policy/xgmi_plpd' sysfs interface.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/aldebaran_ppt.c

@@ -266,9 +266,31 @@ static int aldebaran_tables_init(struct smu_context *smu)
 	return 0;
 }
 
+static int aldebaran_select_plpd_policy(struct smu_context *smu, int level)
+{
+	struct amdgpu_device *adev = smu->adev;
+
+	/* The message only works on master die and NACK will be sent
+	 * back for other dies, only send it on master die.
+	 */
+	if (adev->smuio.funcs->get_socket_id(adev) ||
+	    adev->smuio.funcs->get_die_id(adev))
+		return 0;
+
+	if (level == XGMI_PLPD_DEFAULT)
+		return smu_cmn_send_smc_msg_with_param(
+			smu, SMU_MSG_GmiPwrDnControl, 0, NULL);
+	else if (level == XGMI_PLPD_DISALLOW)
+		return smu_cmn_send_smc_msg_with_param(
+			smu, SMU_MSG_GmiPwrDnControl, 1, NULL);
+	else
+		return -EINVAL;
+}
+
 static int aldebaran_allocate_dpm_context(struct smu_context *smu)
 {
 	struct smu_dpm_context *smu_dpm = &smu->smu_dpm;
+	struct smu_dpm_policy *policy;
 
 	smu_dpm->dpm_context = kzalloc(sizeof(struct smu_13_0_dpm_context),
 				       GFP_KERNEL);
@@ -276,6 +298,20 @@ static int aldebaran_allocate_dpm_context(struct smu_context *smu)
 		return -ENOMEM;
 	smu_dpm->dpm_context_size = sizeof(struct smu_13_0_dpm_context);
 
+	smu_dpm->dpm_policies =
+		kzalloc(sizeof(struct smu_dpm_policy_ctxt), GFP_KERNEL);
+
+	if (!smu_dpm->dpm_policies)
+		return -ENOMEM;
+
+	policy = &(smu_dpm->dpm_policies->policies[0]);
+	policy->policy_type = PP_PM_POLICY_XGMI_PLPD;
+	policy->level_mask = BIT(XGMI_PLPD_DISALLOW) | BIT(XGMI_PLPD_DEFAULT);
+	policy->current_level = XGMI_PLPD_DEFAULT;
+	policy->set_policy = aldebaran_select_plpd_policy;
+	smu_cmn_generic_plpd_policy_desc(policy);
+	smu_dpm->dpm_policies->policy_mask |= BIT(PP_PM_POLICY_XGMI_PLPD);
+
 	return 0;
 }