210  *			(EPP) or energy performance bias (EPB),
212  * @epp_policy:		Last saved policy used to set EPP/EPB
634 	s16 epp;  in intel_pstate_get_epp()  local
639 		 * MSR_HWP_REQUEST, so need to read and get EPP.  in intel_pstate_get_epp()
642 			epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,  in intel_pstate_get_epp()
644 			if (epp)  in intel_pstate_get_epp()
645 				return epp;  in intel_pstate_get_epp()
647 		epp = (hwp_req_data >> 24) & 0xff;  in intel_pstate_get_epp()
649 		/* When there is no EPP present, HWP uses EPB settings */  in intel_pstate_get_epp()
650 		epp = intel_pstate_get_epb(cpu_data);  in intel_pstate_get_epp()
653 	return epp;  in intel_pstate_get_epp()
675  * EPP/EPB display strings corresponding to EPP index in the
712 	s16 epp;  in intel_pstate_get_energy_pref_index()  local
716 	epp = intel_pstate_get_epp(cpu_data, 0);  in intel_pstate_get_energy_pref_index()
717 	if (epp < 0)  in intel_pstate_get_energy_pref_index()
718 		return epp;  in intel_pstate_get_energy_pref_index()
721 		if (epp == epp_values[EPP_INDEX_PERFORMANCE])  in intel_pstate_get_energy_pref_index()
723 		if (epp == epp_values[EPP_INDEX_BALANCE_PERFORMANCE])  in intel_pstate_get_energy_pref_index()
725 		if (epp == epp_values[EPP_INDEX_BALANCE_POWERSAVE])  in intel_pstate_get_energy_pref_index()
727 		if (epp == epp_values[EPP_INDEX_POWERSAVE])  in intel_pstate_get_energy_pref_index()
729 		*raw_epp = epp;  in intel_pstate_get_energy_pref_index()
742 		index = (epp >> 2) + 1;  in intel_pstate_get_energy_pref_index()
748 static int intel_pstate_set_epp(struct cpudata *cpu, u32 epp)  in intel_pstate_set_epp()  argument
760 	value |= (u64)epp << 24;  in intel_pstate_set_epp()
769 		cpu->epp_cached = epp;  in intel_pstate_set_epp()
778 	int epp = -EINVAL;  in intel_pstate_set_energy_pref_index()  local
782 		epp = cpu_data->epp_default;  in intel_pstate_set_energy_pref_index()
786 			epp = raw_epp;  in intel_pstate_set_energy_pref_index()
787 		else if (epp == -EINVAL)  in intel_pstate_set_energy_pref_index()
788 			epp = epp_values[pref_index];  in intel_pstate_set_energy_pref_index()
791 		 * To avoid confusion, refuse to set EPP to any values different  in intel_pstate_set_energy_pref_index()
795 		if (epp > 0 && cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)  in intel_pstate_set_energy_pref_index()
798 		ret = intel_pstate_set_epp(cpu_data, epp);  in intel_pstate_set_energy_pref_index()
800 		if (epp == -EINVAL)  in intel_pstate_set_energy_pref_index()
801 			epp = (pref_index - 1) << 2;  in intel_pstate_set_energy_pref_index()
802 		ret = intel_pstate_set_epb(cpu_data->cpu, epp);  in intel_pstate_set_energy_pref_index()
833 	u32 epp = 0;  in store_energy_performance_preference()  local
844 		ret = kstrtouint(buf, 10, &epp);  in store_energy_performance_preference()
848 		if (epp > 255)  in store_energy_performance_preference()
865 		ret = intel_pstate_set_energy_pref_index(cpu, ret, raw, epp);  in store_energy_performance_preference()
869 		 * target CPU before the EPP update and restarted after it,  in store_energy_performance_preference()
874 			epp = ret ? epp_values[ret] : cpu->epp_default;  in store_energy_performance_preference()
876 		if (cpu->epp_cached != epp) {  in store_energy_performance_preference()
880 			ret = intel_pstate_set_epp(cpu, epp);  in store_energy_performance_preference()
1153 	s16 epp;  in intel_pstate_hwp_set()  local
1175 		epp = intel_pstate_get_epp(cpu_data, value);  in intel_pstate_hwp_set()
1176 		cpu_data->epp_powersave = epp;  in intel_pstate_hwp_set()
1177 		/* If EPP read was failed, then don't try to write */  in intel_pstate_hwp_set()
1178 		if (epp < 0)  in intel_pstate_hwp_set()
1181 		epp = 0;  in intel_pstate_hwp_set()
1183 		/* skip setting EPP, when saved value is invalid */  in intel_pstate_hwp_set()
1188 		 * No need to restore EPP when it is not zero. This  in intel_pstate_hwp_set()
1194 		epp = intel_pstate_get_epp(cpu_data, value);  in intel_pstate_hwp_set()
1195 		if (epp)  in intel_pstate_hwp_set()
1198 		epp = cpu_data->epp_powersave;  in intel_pstate_hwp_set()
1202 		value |= (u64)epp << 24;  in intel_pstate_hwp_set()
1204 		intel_pstate_set_epb(cpu, epp);  in intel_pstate_hwp_set()
1222 		 * In case the EPP has been set to "performance" by the  in intel_pstate_hwp_offline()
1224 		 * temporary value with the cached EPP one.  in intel_pstate_hwp_offline()
1229 		 * However, make sure that EPP will be set to "performance" when  in intel_pstate_hwp_offline()
1251 	/* Set EPP to min */  in intel_pstate_hwp_offline()
1943 	 * If the EPP is set by firmware, which means that firmware enabled HWP  in intel_pstate_update_epp_defaults()
1944 	 * - Is equal or less than 0x80 (default balance_perf EPP)  in intel_pstate_update_epp_defaults()
1945 	 * - But less performance oriented than performance EPP  in intel_pstate_update_epp_defaults()
1946 	 *   then use this as new balance_perf EPP.  in intel_pstate_update_epp_defaults()
1956 	 * EPP return.  in intel_pstate_update_epp_defaults()
1963 	 * and default EPP.  in intel_pstate_update_epp_defaults()
3651 	 * Set EPP value as 102, this is the max suggested EPP
3692 		 * Avoid enabling HWP for processors without EPP support,  in intel_pstate_init()