1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Header file for CPUFreq ondemand governor and related code. 4 * 5 * Copyright (C) 2016, Intel Corporation 6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 7 */ 8 9 #include "cpufreq_governor.h" 10 11 struct od_policy_dbs_info { 12 struct policy_dbs_info policy_dbs; 13 unsigned int freq_lo; 14 unsigned int freq_lo_delay_us; 15 unsigned int freq_hi_delay_us; 16 unsigned int sample_type:1; 17 }; 18 19 static inline struct od_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs) 20 { 21 return container_of(policy_dbs, struct od_policy_dbs_info, policy_dbs); 22 } 23 24 struct od_dbs_tuners { 25 unsigned int powersave_bias; 26 }; 27 28 #ifdef CONFIG_X86 29 #include <asm/cpu_device_id.h> 30 31 /* 32 * Not all CPUs want IO time to be accounted as busy; this depends on 33 * how efficient idling at a higher frequency/voltage is. 34 * 35 * Pavel Machek says this is not so for various generations of AMD and 36 * old Intel systems. Mike Chan (android.com) claims this is also not 37 * true for ARM. 38 * 39 * Because of this, select a known series of Intel CPUs (Family 6 and 40 * later) by default, and leave all others up to the user. 41 */ 42 static inline bool od_should_io_be_busy(void) 43 { 44 return (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && 45 boot_cpu_data.x86_vfm >= INTEL_PENTIUM_PRO); 46 } 47 #else 48 static inline bool od_should_io_be_busy(void) { return false; } 49 #endif 50