drm/amd/pm: add xgmi plpd mode selecting interface for smu v13.0.6

Add the interface to change xgmi per-link power down policy.

v2: split from sysfs interface code and miscellaneous updates
v3: check against XGMI_PLPD_DEFAULT/XGMI_PLPD_OPTIMIZED and
    pass PPSMC param
Signed-off-by: Le Ma <le.ma@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3157,6 +3157,30 @@ static int smu_get_prv_buffer_details(void *handle, void **addr, size_t *size)
 	return 0;
 }
 
+int smu_set_xgmi_plpd_mode(struct smu_context *smu,
+			   enum pp_xgmi_plpd_mode mode)
+{
+	int ret = -EOPNOTSUPP;
+
+	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled)
+		return ret;
+
+	/* PLPD policy is not supported if it's NONE */
+	if (smu->plpd_mode == XGMI_PLPD_NONE)
+		return ret;
+
+	if (smu->plpd_mode == mode)
+		return 0;
+
+	if (smu->ppt_funcs && smu->ppt_funcs->select_xgmi_plpd_policy)
+		ret = smu->ppt_funcs->select_xgmi_plpd_policy(smu, mode);
+
+	if (!ret)
+		smu->plpd_mode = mode;
+
+	return ret;
+}
+
 static const struct amd_pm_funcs swsmu_pm_funcs = {
 	/* export for sysfs */
 	.set_fan_control_mode    = smu_set_fan_control_mode,

drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h

@@ -840,6 +840,12 @@ struct pptable_funcs {
 	 */
 	int (*allow_xgmi_power_down)(struct smu_context *smu, bool en);
 
+	/**
+	 * @select_xgmi_plpd_policy: Select xgmi per-link power down policy.
+	 */
+	int (*select_xgmi_plpd_policy)(struct smu_context *smu,
+				       enum pp_xgmi_plpd_mode mode);
+
 	/**
 	 * @update_pcie_parameters: Update and upload the system's PCIe
 	 *                          capabilites to the SMU.
@@ -1487,6 +1493,9 @@ int smu_set_ac_dc(struct smu_context *smu);
 
 int smu_allow_xgmi_power_down(struct smu_context *smu, bool en);
 
+int smu_set_xgmi_plpd_mode(struct smu_context *smu,
+			   enum pp_xgmi_plpd_mode mode);
+
 int smu_get_entrycount_gfxoff(struct smu_context *smu, u64 *value);
 
 int smu_get_residency_gfxoff(struct smu_context *smu, u32 *value);

drivers/gpu/drm/amd/pm/swsmu/inc/smu_types.h

@@ -252,7 +252,8 @@
 	__SMU_DUMMY_MAP(QueryValidMcaCount),	\
 	__SMU_DUMMY_MAP(QueryValidMcaCeCount),	\
 	__SMU_DUMMY_MAP(McaBankDumpDW),		\
-	__SMU_DUMMY_MAP(McaBankCeDumpDW),
+	__SMU_DUMMY_MAP(McaBankCeDumpDW),	\
+	__SMU_DUMMY_MAP(SelectPLPDMode),
 
 #undef __SMU_DUMMY_MAP
 #define __SMU_DUMMY_MAP(type)	SMU_MSG_##type

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

@@ -170,6 +170,7 @@ static const struct cmn2asic_msg_mapping smu_v13_0_6_message_map[SMU_MSG_MAX_COU
 	MSG_MAP(QueryValidMcaCeCount,                PPSMC_MSG_QueryValidMcaCeCount,            0),
 	MSG_MAP(McaBankDumpDW,                       PPSMC_MSG_McaBankDumpDW,                   0),
 	MSG_MAP(McaBankCeDumpDW,                     PPSMC_MSG_McaBankCeDumpDW,                 0),
+	MSG_MAP(SelectPLPDMode,                      PPSMC_MSG_SelectPLPDMode,                  0),
 };
 
 static const struct cmn2asic_mapping smu_v13_0_6_clk_map[SMU_CLK_COUNT] = {
@@ -2716,6 +2717,35 @@ static const struct amdgpu_mca_smu_funcs smu_v13_0_6_mca_smu_funcs = {
 	.mca_get_ras_mca_idx_array = mca_smu_get_ras_mca_idx_array,
 };
 
+static int smu_v13_0_6_select_xgmi_plpd_policy(struct smu_context *smu,
+					       enum pp_xgmi_plpd_mode mode)
+{
+	struct amdgpu_device *adev = smu->adev;
+	int ret, param;
+
+	switch (mode) {
+	case XGMI_PLPD_DEFAULT:
+		param = PPSMC_PLPD_MODE_DEFAULT;
+		break;
+	case XGMI_PLPD_OPTIMIZED:
+		param = PPSMC_PLPD_MODE_OPTIMIZED;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* 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",
+			mode);
+
+	return ret;
+}
+
 static const struct pptable_funcs smu_v13_0_6_ppt_funcs = {
 	/* init dpm */
 	.get_allowed_feature_mask = smu_v13_0_6_get_allowed_feature_mask,
@@ -2756,6 +2786,7 @@ static const struct pptable_funcs smu_v13_0_6_ppt_funcs = {
 	.od_edit_dpm_table = smu_v13_0_6_usr_edit_dpm_table,
 	.set_df_cstate = smu_v13_0_6_set_df_cstate,
 	.allow_xgmi_power_down = smu_v13_0_6_allow_xgmi_power_down,
+	.select_xgmi_plpd_policy = smu_v13_0_6_select_xgmi_plpd_policy,
 	.log_thermal_throttling_event = smu_v13_0_6_log_thermal_throttling_event,
 	.get_pp_feature_mask = smu_cmn_get_pp_feature_mask,
 	.get_gpu_metrics = smu_v13_0_6_get_gpu_metrics,