drm/amd/pm: Add xgmi plpd to SMU v13.0.6 pm_policy

On SOCs with SMU v13.0.6, 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/amdgpu_smu.c

@@ -1197,6 +1197,9 @@ static void smu_swctf_delayed_work_handler(struct work_struct *work)
 
 static void smu_init_xgmi_plpd_mode(struct smu_context *smu)
 {
+	struct smu_dpm_context *dpm_ctxt = &(smu->smu_dpm);
+	struct smu_dpm_policy_ctxt *policy_ctxt;
+
 	if (amdgpu_ip_version(smu->adev, MP1_HWIP, 0) == IP_VERSION(11, 0, 2)) {
 		smu->plpd_mode = XGMI_PLPD_DEFAULT;
 		return;
@@ -1204,10 +1207,20 @@ static void smu_init_xgmi_plpd_mode(struct smu_context *smu)
 
 	/* PMFW put PLPD into default policy after enabling the feature */
 	if (smu_feature_is_enabled(smu,
-				   SMU_FEATURE_XGMI_PER_LINK_PWR_DWN_BIT))
+				   SMU_FEATURE_XGMI_PER_LINK_PWR_DWN_BIT)) {
+		struct smu_dpm_policy *policy;
+
 		smu->plpd_mode = XGMI_PLPD_DEFAULT;
-	else
+		policy = smu_get_pm_policy(smu, PP_PM_POLICY_XGMI_PLPD);
+		if (policy)
+			policy->current_level = XGMI_PLPD_DEFAULT;
+	} else {
 		smu->plpd_mode = XGMI_PLPD_NONE;
+		policy_ctxt = dpm_ctxt->dpm_policies;
+		if (policy_ctxt)
+			policy_ctxt->policy_mask &=
+				~BIT(PP_PM_POLICY_XGMI_PLPD);
+	}
 }
 
 static int smu_sw_init(void *handle)

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c

@@ -403,9 +403,45 @@ static int smu_v13_0_6_select_policy_soc_pstate(struct smu_context *smu,
 	return ret;
 }
 
+static int smu_v13_0_6_select_plpd_policy(struct smu_context *smu, int level)
+{
+	struct amdgpu_device *adev = smu->adev;
+	int ret, param;
+
+	switch (level) {
+	case XGMI_PLPD_DEFAULT:
+		param = PPSMC_PLPD_MODE_DEFAULT;
+		break;
+	case XGMI_PLPD_OPTIMIZED:
+		param = PPSMC_PLPD_MODE_OPTIMIZED;
+		break;
+	case XGMI_PLPD_DISALLOW:
+		param = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (level == XGMI_PLPD_DISALLOW)
+		ret = smu_cmn_send_smc_msg_with_param(
+			smu, SMU_MSG_GmiPwrDnControl, param, NULL);
+	else
+		/* change xgmi per-link power down policy */
+		ret = smu_cmn_send_smc_msg_with_param(
+			smu, SMU_MSG_SelectPLPDMode, param, NULL);
+
+	if (ret)
+		dev_err(adev->dev,
+			"select xgmi per-link power down policy %d failed\n",
+			level);
+
+	return ret;
+}
+
 static int smu_v13_0_6_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);
@@ -413,11 +449,9 @@ static int smu_v13_0_6_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->adev->flags & AMD_IS_APU)) {
-		struct smu_dpm_policy *policy;
-
-		smu_dpm->dpm_policies =
-			kzalloc(sizeof(struct smu_dpm_policy_ctxt), GFP_KERNEL);
 		policy = &(smu_dpm->dpm_policies->policies[0]);
 
 		policy->policy_type = PP_PM_POLICY_SOC_PSTATE;
@@ -430,6 +464,15 @@ static int smu_v13_0_6_allocate_dpm_context(struct smu_context *smu)
 		smu_dpm->dpm_policies->policy_mask |=
 			BIT(PP_PM_POLICY_SOC_PSTATE);
 	}
+	policy = &(smu_dpm->dpm_policies->policies[1]);
+
+	policy->policy_type = PP_PM_POLICY_XGMI_PLPD;
+	policy->level_mask = BIT(XGMI_PLPD_DISALLOW) | BIT(XGMI_PLPD_DEFAULT) |
+			     BIT(XGMI_PLPD_OPTIMIZED);
+	policy->current_level = XGMI_PLPD_DEFAULT;
+	policy->set_policy = smu_v13_0_6_select_plpd_policy;
+	smu_cmn_generic_plpd_policy_desc(policy);
+	smu_dpm->dpm_policies->policy_mask |= BIT(PP_PM_POLICY_XGMI_PLPD);
 
 	return 0;
 }

drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c

@@ -1165,3 +1165,30 @@ void smu_cmn_generic_soc_policy_desc(struct smu_dpm_policy *policy)
 	policy->desc = &pstate_policy_desc;
 }
 
+static char *smu_xgmi_plpd_policy_get_desc(struct smu_dpm_policy *policy,
+					   int level)
+{
+	if (level < 0 || !(policy->level_mask & BIT(level)))
+		return "Invalid";
+
+	switch (level) {
+	case XGMI_PLPD_DISALLOW:
+		return "plpd_disallow";
+	case XGMI_PLPD_DEFAULT:
+		return "plpd_default";
+	case XGMI_PLPD_OPTIMIZED:
+		return "plpd_optimized";
+	}
+
+	return "Invalid";
+}
+
+static struct smu_dpm_policy_desc xgmi_plpd_policy_desc = {
+	.name = STR_XGMI_PLPD_POLICY,
+	.get_desc = smu_xgmi_plpd_policy_get_desc,
+};
+
+void smu_cmn_generic_plpd_policy_desc(struct smu_dpm_policy *policy)
+{
+	policy->desc = &xgmi_plpd_policy_desc;
+}

drivers/gpu/drm/amd/pm/swsmu/smu_cmn.h

@@ -145,6 +145,7 @@ static inline void smu_cmn_get_sysfs_buf(char **buf, int *offset)
 
 bool smu_cmn_is_audio_func_enabled(struct amdgpu_device *adev);
 void smu_cmn_generic_soc_policy_desc(struct smu_dpm_policy *policy);
+void smu_cmn_generic_plpd_policy_desc(struct smu_dpm_policy *policy);
 
 #endif
 #endif