/* * intel_pstate.c: Native P state management for Intel processors * * (C) Copyright 2012 Intel Corporation * Author: Dirk Brandewie * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; version 2 * of the License. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define INTEL_PSTATE_DEFAULT_SAMPLING_INTERVAL (10 * NSEC_PER_MSEC) #define INTEL_PSTATE_HWP_SAMPLING_INTERVAL (50 * NSEC_PER_MSEC) #define INTEL_CPUFREQ_TRANSITION_LATENCY 20000 #define INTEL_CPUFREQ_TRANSITION_DELAY 500 #ifdef CONFIG_ACPI #include #include #endif #define FRAC_BITS 8 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) #define fp_toint(X) ((X) >> FRAC_BITS) #define EXT_BITS 6 #define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS) #define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS) #define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS) static inline int32_t mul_fp(int32_t x, int32_t y) { return ((int64_t)x * (int64_t)y) >> FRAC_BITS; } static inline int32_t div_fp(s64 x, s64 y) { return div64_s64((int64_t)x << FRAC_BITS, y); } static inline int ceiling_fp(int32_t x) { int mask, ret; ret = fp_toint(x); mask = (1 << FRAC_BITS) - 1; if (x & mask) ret += 1; return ret; } static inline int32_t percent_fp(int percent) { return div_fp(percent, 100); } static inline u64 mul_ext_fp(u64 x, u64 y) { return (x * y) >> EXT_FRAC_BITS; } static inline u64 div_ext_fp(u64 x, u64 y) { return div64_u64(x << EXT_FRAC_BITS, y); } static inline int32_t percent_ext_fp(int percent) { return div_ext_fp(percent, 100); } /** * struct sample - Store performance sample * @core_avg_perf: Ratio of APERF/MPERF which is the actual average * performance during last sample period * @busy_scaled: Scaled busy value which is used to calculate next * P state. This can be different than core_avg_perf * to account for cpu idle period * @aperf: Difference of actual performance frequency clock count * read from APERF MSR between last and current sample * @mperf: Difference of maximum performance frequency clock count * read from MPERF MSR between last and current sample * @tsc: Difference of time stamp counter between last and * current sample * @time: Current time from scheduler * * This structure is used in the cpudata structure to store performance sample * data for choosing next P State. */ struct sample { int32_t core_avg_perf; int32_t busy_scaled; u64 aperf; u64 mperf; u64 tsc; u64 time; }; /** * struct pstate_data - Store P state data * @current_pstate: Current requested P state * @min_pstate: Min P state possible for this platform * @max_pstate: Max P state possible for this platform * @max_pstate_physical:This is physical Max P state for a processor * This can be higher than the max_pstate which can * be limited by platform thermal design power limits * @scaling: Scaling factor to convert frequency to cpufreq * frequency units * @turbo_pstate: Max Turbo P state possible for this platform * @max_freq: @max_pstate frequency in cpufreq units * @turbo_freq: @turbo_pstate frequency in cpufreq units * * Stores the per cpu model P state limits and current P state. */ struct pstate_data { int current_pstate; int min_pstate; int max_pstate; int max_pstate_physical; int scaling; int turbo_pstate; unsigned int max_freq; unsigned int turbo_freq; }; /** * struct vid_data - Stores voltage information data * @min: VID data for this platform corresponding to * the lowest P state * @max: VID data corresponding to the highest P State. * @turbo: VID data for turbo P state * @ratio: Ratio of (vid max - vid min) / * (max P state - Min P State) * * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling) * This data is used in Atom platforms, where in addition to target P state, * the voltage data needs to be specified to select next P State. */ struct vid_data { int min; int max; int turbo; int32_t ratio; }; /** * struct _pid - Stores PID data * @setpoint: Target set point for busyness or performance * @integral: Storage for accumulated error values * @p_gain: PID proportional gain * @i_gain: PID integral gain * @d_gain: PID derivative gain * @deadband: PID deadband * @last_err: Last error storage for integral part of PID calculation * * Stores PID coefficients and last error for PID controller. */ struct _pid { int setpoint; int32_t integral; int32_t p_gain; int32_t i_gain; int32_t d_gain; int deadband; int32_t last_err; }; /** * struct global_params - Global parameters, mostly tunable via sysfs. * @no_turbo: Whether or not to use turbo P-states. * @turbo_disabled: Whethet or not turbo P-states are available at all, * based on the MSR_IA32_MISC_ENABLE value and whether or * not the maximum reported turbo P-state is different from * the maximum reported non-turbo one. * @min_perf_pct: Minimum capacity limit in percent of the maximum turbo * P-state capacity. * @max_perf_pct: Maximum capacity limit in percent of the maximum turbo * P-state capacity. */ struct global_params { bool no_turbo; bool turbo_disabled; int max_perf_pct; int min_perf_pct; }; /** * struct cpudata - Per CPU instance data storage * @cpu: CPU number for this instance data * @policy: CPUFreq policy value * @update_util: CPUFreq utility callback information * @update_util_set: CPUFreq utility callback is set * @iowait_boost: iowait-related boost fraction * @last_update: Time of the last update. * @pstate: Stores P state limits for this CPU * @vid: Stores VID limits for this CPU * @pid: Stores PID parameters for this CPU * @last_sample_time: Last Sample time * @prev_aperf: Last APERF value read from APERF MSR * @prev_mperf: Last MPERF value read from MPERF MSR * @prev_tsc: Last timestamp counter (TSC) value * @prev_cummulative_iowait: IO Wait time difference from last and * current sample * @sample: Storage for storing last Sample data * @min_perf: Minimum capacity limit as a fraction of the maximum * turbo P-state capacity. * @max_perf: Maximum capacity limit as a fraction of the maximum * turbo P-state capacity. * @acpi_perf_data: Stores ACPI perf information read from _PSS * @valid_pss_table: Set to true for valid ACPI _PSS entries found * @epp_powersave: Last saved HWP energy performance preference * (EPP) or energy performance bias (EPB), * when policy switched to performance * @epp_policy: Last saved policy used to set EPP/EPB * @epp_default: Power on default HWP energy performance * preference/bias * @epp_saved: Saved EPP/EPB during system suspend or CPU offline * operation * * This structure stores per CPU instance data for all CPUs. */ struct cpudata { int cpu; unsigned int policy; struct update_util_data update_util; bool update_util_set; struct pstate_data pstate; struct vid_data vid; struct _pid pid; u64 last_update; u64 last_sample_time; u64 prev_aperf; u64 prev_mperf; u64 prev_tsc; u64 prev_cummulative_iowait; struct sample sample; int32_t min_perf; int32_t max_perf; #ifdef CONFIG_ACPI struct acpi_processor_performance acpi_perf_data; bool valid_pss_table; #endif unsigned int iowait_boost; s16 epp_powersave; s16 epp_policy; s16 epp_default; s16 epp_saved; }; static struct cpudata **all_cpu_data; /** * struct pstate_adjust_policy - Stores static PID configuration data * @sample_rate_ms: PID calculation sample rate in ms * @sample_rate_ns: Sample rate calculation in ns * @deadband: PID deadband * @setpoint: PID Setpoint * @p_gain_pct: PID proportional gain * @i_gain_pct: PID integral gain * @d_gain_pct: PID derivative gain * * Stores per CPU model static PID configuration data. */ struct pstate_adjust_policy { int sample_rate_ms; s64 sample_rate_ns; int deadband; int setpoint; int p_gain_pct; int d_gain_pct; int i_gain_pct; }; /** * struct pstate_funcs - Per CPU model specific callbacks * @get_max: Callback to get maximum non turbo effective P state * @get_max_physical: Callback to get maximum non turbo physical P state * @get_min: Callback to get minimum P state * @get_turbo: Callback to get turbo P state * @get_scaling: Callback to get frequency scaling factor * @get_val: Callback to convert P state to actual MSR write value * @get_vid: Callback to get VID data for Atom platforms * @update_util: Active mode utilization update callback. * * Core and Atom CPU models have different way to get P State limits. This * structure is used to store those callbacks. */ struct pstate_funcs { int (*get_max)(void); int (*get_max_physical)(void); int (*get_min)(void); int (*get_turbo)(void); int (*get_scaling)(void); u64 (*get_val)(struct cpudata*, int pstate); void (*get_vid)(struct cpudata *); void (*update_util)(struct update_util_data *data, u64 time, unsigned int flags); }; static struct pstate_funcs pstate_funcs __read_mostly; static struct pstate_adjust_policy pid_params __read_mostly = { .sample_rate_ms = 10, .sample_rate_ns = 10 * NSEC_PER_MSEC, .deadband = 0, .setpoint = 97, .p_gain_pct = 20, .d_gain_pct = 0, .i_gain_pct = 0, }; static int hwp_active __read_mostly; static bool per_cpu_limits __read_mostly; static struct cpufreq_driver *intel_pstate_driver __read_mostly; #ifdef CONFIG_ACPI static bool acpi_ppc; #endif static struct global_params global; static DEFINE_MUTEX(intel_pstate_driver_lock); static DEFINE_MUTEX(intel_pstate_limits_lock); #ifdef CONFIG_ACPI static bool intel_pstate_get_ppc_enable_status(void) { if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER || acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER) return true; return acpi_ppc; } #ifdef CONFIG_ACPI_CPPC_LIB /* The work item is needed to avoid CPU hotplug locking issues */ static void intel_pstste_sched_itmt_work_fn(struct work_struct *work) { sched_set_itmt_support(); } static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn); static void intel_pstate_set_itmt_prio(int cpu) { struct cppc_perf_caps cppc_perf; static u32 max_highest_perf = 0, min_highest_perf = U32_MAX; int ret; ret = cppc_get_perf_caps(cpu, &cppc_perf); if (ret) return; /* * The priorities can be set regardless of whether or not * sched_set_itmt_support(true) has been called and it is valid to * update them at any time after it has been called. */ sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu); if (max_highest_perf <= min_highest_perf) { if (cppc_perf.highest_perf > max_highest_perf) max_highest_perf = cppc_perf.highest_perf; if (cppc_perf.highest_perf < min_highest_perf) min_highest_perf = cppc_perf.highest_perf; if (max_highest_perf > min_highest_perf) { /* * This code can be run during CPU online under the * CPU hotplug locks, so sched_set_itmt_support() * cannot be called from here. Queue up a work item * to invoke it. */ schedule_work(&sched_itmt_work); } } } #else static void intel_pstate_set_itmt_prio(int cpu) { } #endif static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) { struct cpudata *cpu; int ret; int i; if (hwp_active) { intel_pstate_set_itmt_prio(policy->cpu); return; } if (!intel_pstate_get_ppc_enable_status()) return; cpu = all_cpu_data[policy->cpu]; ret = acpi_processor_register_performance(&cpu->acpi_perf_data, policy->cpu); if (ret) return; /* * Check if the control value in _PSS is for PERF_CTL MSR, which should * guarantee that the states returned by it map to the states in our * list directly. */ if (cpu->acpi_perf_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) goto err; /* * If there is only one entry _PSS, simply ignore _PSS and continue as * usual without taking _PSS into account */ if (cpu->acpi_perf_data.state_count < 2) goto err; pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu); for (i = 0; i < cpu->acpi_perf_data.state_count; i++) { pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n", (i == cpu->acpi_perf_data.state ? '*' : ' '), i, (u32) cpu->acpi_perf_data.states[i].core_frequency, (u32) cpu->acpi_perf_data.states[i].power, (u32) cpu->acpi_perf_data.states[i].control); } /* * The _PSS table doesn't contain whole turbo frequency range. * This just contains +1 MHZ above the max non turbo frequency, * with control value corresponding to max turbo ratio. But * when cpufreq set policy is called, it will call with this * max frequency, which will cause a reduced performance as * this driver uses real max turbo frequency as the max * frequency. So correct this frequency in _PSS table to * correct max turbo frequency based on the turbo state. * Also need to convert to MHz as _PSS freq is in MHz. */ if (!global.turbo_disabled) cpu->acpi_perf_data.states[0].core_frequency = policy->cpuinfo.max_freq / 1000; cpu->valid_pss_table = true; pr_debug("_PPC limits will be enforced\n"); return; err: cpu->valid_pss_table = false; acpi_processor_unregister_performance(policy->cpu); } static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) { struct cpudata *cpu; cpu = all_cpu_data[policy->cpu]; if (!cpu->valid_pss_table) return; acpi_processor_unregister_performance(policy->cpu); } #else static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) { } static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) { } #endif static signed int pid_calc(struct _pid *pid, int32_t busy) { signed int result; int32_t pterm, dterm, fp_error; int32_t integral_limit; fp_error = pid->setpoint - busy; if (abs(fp_error) <= pid->deadband) return 0; pterm = mul_fp(pid->p_gain, fp_error); pid->integral += fp_error; /* * We limit the integral here so that it will never * get higher than 30. This prevents it from becoming * too large an input over long periods of time and allows * it to get factored out sooner. * * The value of 30 was chosen through experimentation. */ integral_limit = int_tofp(30); if (pid->integral > integral_limit) pid->integral = integral_limit; if (pid->integral < -integral_limit) pid->integral = -integral_limit; dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); pid->last_err = fp_error; result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; result = result + (1 << (FRAC_BITS-1)); return (signed int)fp_toint(result); } static inline void intel_pstate_pid_reset(struct cpudata *cpu) { struct _pid *pid = &cpu->pid; pid->p_gain = percent_fp(pid_params.p_gain_pct); pid->d_gain = percent_fp(pid_params.d_gain_pct); pid->i_gain = percent_fp(pid_params.i_gain_pct); pid->setpoint = int_tofp(pid_params.setpoint); pid->last_err = pid->setpoint - int_tofp(100); pid->deadband = int_tofp(pid_params.deadband); pid->integral = 0; } static inline void update_turbo_state(void) { u64 misc_en; struct cpudata *cpu; cpu = all_cpu_data[0]; rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); global.turbo_disabled = (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); } static int min_perf_pct_min(void) { struct cpudata *cpu = all_cpu_data[0]; return DIV_ROUND_UP(cpu->pstate.min_pstate * 100, cpu->pstate.turbo_pstate); } static s16 intel_pstate_get_epb(struct cpudata *cpu_data) { u64 epb; int ret; if (!static_cpu_has(X86_FEATURE_EPB)) return -ENXIO; ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb); if (ret) return (s16)ret; return (s16)(epb & 0x0f); } static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data) { s16 epp; if (static_cpu_has(X86_FEATURE_HWP_EPP)) { /* * When hwp_req_data is 0, means that caller didn't read * MSR_HWP_REQUEST, so need to read and get EPP. */ if (!hwp_req_data) { epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &hwp_req_data); if (epp) return epp; } epp = (hwp_req_data >> 24) & 0xff; } else { /* When there is no EPP present, HWP uses EPB settings */ epp = intel_pstate_get_epb(cpu_data); } return epp; } static int intel_pstate_set_epb(int cpu, s16 pref) { u64 epb; int ret; if (!static_cpu_has(X86_FEATURE_EPB)) return -ENXIO; ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb); if (ret) return ret; epb = (epb & ~0x0f) | pref; wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb); return 0; } /* * EPP/EPB display strings corresponding to EPP index in the * energy_perf_strings[] * index String *------------------------------------- * 0 default * 1 performance * 2 balance_performance * 3 balance_power * 4 power */ static const char * const energy_perf_strings[] = { "default", "performance", "balance_performance", "balance_power", "power", NULL }; static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data) { s16 epp; int index = -EINVAL; epp = intel_pstate_get_epp(cpu_data, 0); if (epp < 0) return epp; if (static_cpu_has(X86_FEATURE_HWP_EPP)) { /* * Range: * 0x00-0x3F : Performance * 0x40-0x7F : Balance performance * 0x80-0xBF : Balance power * 0xC0-0xFF : Power * The EPP is a 8 bit value, but our ranges restrict the * value which can be set. Here only using top two bits * effectively. */ index = (epp >> 6) + 1; } else if (static_cpu_has(X86_FEATURE_EPB)) { /* * Range: * 0x00-0x03 : Performance * 0x04-0x07 : Balance performance * 0x08-0x0B : Balance power * 0x0C-0x0F : Power * The EPB is a 4 bit value, but our ranges restrict the * value which can be set. Here only using top two bits * effectively. */ index = (epp >> 2) + 1; } return index; } static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data, int pref_index) { int epp = -EINVAL; int ret; if (!pref_index) epp = cpu_data->epp_default; mutex_lock(&intel_pstate_limits_lock); if (static_cpu_has(X86_FEATURE_HWP_EPP)) { u64 value; ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value); if (ret) goto return_pref; value &= ~GENMASK_ULL(31, 24); /* * If epp is not default, convert from index into * energy_perf_strings to epp value, by shifting 6 * bits left to use only top two bits in epp. * The resultant epp need to shifted by 24 bits to * epp position in MSR_HWP_REQUEST. */ if (epp == -EINVAL) epp = (pref_index - 1) << 6; value |= (u64)epp << 24; ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value); } else { if (epp == -EINVAL) epp = (pref_index - 1) << 2; ret = intel_pstate_set_epb(cpu_data->cpu, epp); } return_pref: mutex_unlock(&intel_pstate_limits_lock); return ret; } static ssize_t show_energy_performance_available_preferences( struct cpufreq_policy *policy, char *buf) { int i = 0; int ret = 0; while (energy_perf_strings[i] != NULL) ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]); ret += sprintf(&buf[ret], "\n"); return ret; } cpufreq_freq_attr_ro(energy_performance_available_preferences); static ssize_t store_energy_performance_preference( struct cpufreq_policy *policy, const char *buf, size_t count) { struct cpudata *cpu_data = all_cpu_data[policy->cpu]; char str_preference[21]; int ret, i = 0; ret = sscanf(buf, "%20s", str_preference); if (ret != 1) return -EINVAL; while (energy_perf_strings[i] != NULL) { if (!strcmp(str_preference, energy_perf_strings[i])) { intel_pstate_set_energy_pref_index(cpu_data, i); return count; } ++i; } return -EINVAL; } static ssize_t show_energy_performance_preference( struct cpufreq_policy *policy, char *buf) { struct cpudata *cpu_data = all_cpu_data[policy->cpu]; int preference; preference = intel_pstate_get_energy_pref_index(cpu_data); if (preference < 0) return preference; return sprintf(buf, "%s\n", energy_perf_strings[preference]); } cpufreq_freq_attr_rw(energy_performance_preference); static struct freq_attr *hwp_cpufreq_attrs[] = { &energy_performance_preference, &energy_performance_available_preferences, NULL, }; static void intel_pstate_hwp_set(unsigned int cpu) { struct cpudata *cpu_data = all_cpu_data[cpu]; int min, hw_min, max, hw_max; u64 value, cap; s16 epp; rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap); hw_min = HWP_LOWEST_PERF(cap); if (global.no_turbo) hw_max = HWP_GUARANTEED_PERF(cap); else hw_max = HWP_HIGHEST_PERF(cap); max = fp_ext_toint(hw_max * cpu_data->max_perf); if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) min = max; else min = fp_ext_toint(hw_max * cpu_data->min_perf); rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); value &= ~HWP_MIN_PERF(~0L); value |= HWP_MIN_PERF(min); value &= ~HWP_MAX_PERF(~0L); value |= HWP_MAX_PERF(max); if (cpu_data->epp_policy == cpu_data->policy) goto skip_epp; cpu_data->epp_policy = cpu_data->policy; if (cpu_data->epp_saved >= 0) { epp = cpu_data->epp_saved; cpu_data->epp_saved = -EINVAL; goto update_epp; } if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) { epp = intel_pstate_get_epp(cpu_data, value); cpu_data->epp_powersave = epp; /* If EPP read was failed, then don't try to write */ if (epp < 0) goto skip_epp; epp = 0; } else { /* skip setting EPP, when saved value is invalid */ if (cpu_data->epp_powersave < 0) goto skip_epp; /* * No need to restore EPP when it is not zero. This * means: * - Policy is not changed * - user has manually changed * - Error reading EPB */ epp = intel_pstate_get_epp(cpu_data, value); if (epp) goto skip_epp; epp = cpu_data->epp_powersave; } update_epp: if (static_cpu_has(X86_FEATURE_HWP_EPP)) { value &= ~GENMASK_ULL(31, 24); value |= (u64)epp << 24; } else { intel_pstate_set_epb(cpu, epp); } skip_epp: wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); } static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) { struct cpudata *cpu_data = all_cpu_data[policy->cpu]; if (!hwp_active) return 0; cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0); return 0; } static int intel_pstate_resume(struct cpufreq_policy *policy) { if (!hwp_active) return 0; mutex_lock(&intel_pstate_limits_lock); all_cpu_data[policy->cpu]->epp_policy = 0; intel_pstate_hwp_set(policy->cpu); mutex_unlock(&intel_pstate_limits_lock); return 0; } static void intel_pstate_update_policies(void) { int cpu; for_each_possible_cpu(cpu) cpufreq_update_policy(cpu); } /************************** debugfs begin ************************/ static int pid_param_set(void *data, u64 val) { unsigned int cpu; *(u32 *)data = val; pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC; for_each_possible_cpu(cpu) if (all_cpu_data[cpu]) intel_pstate_pid_reset(all_cpu_data[cpu]); return 0; } static int pid_param_get(void *data, u64 *val) { *val = *(u32 *)data; return 0; } DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); static struct dentry *debugfs_parent; struct pid_param { char *name; void *value; struct dentry *dentry; }; static struct pid_param pid_files[] = { {"sample_rate_ms", &pid_params.sample_rate_ms, }, {"d_gain_pct", &pid_params.d_gain_pct, }, {"i_gain_pct", &pid_params.i_gain_pct, }, {"deadband", &pid_params.deadband, }, {"setpoint", &pid_params.setpoint, }, {"p_gain_pct", &pid_params.p_gain_pct, }, {NULL, NULL, } }; static void intel_pstate_debug_expose_params(void) { int i; debugfs_parent = debugfs_create_dir("pstate_snb", NULL); if (IS_ERR_OR_NULL(debugfs_parent)) return; for (i = 0; pid_files[i].name; i++) { struct dentry *dentry; dentry = debugfs_create_file(pid_files[i].name, 0660, debugfs_parent, pid_files[i].value, &fops_pid_param); if (!IS_ERR(dentry)) pid_files[i].dentry = dentry; } } static void intel_pstate_debug_hide_params(void) { int i; if (IS_ERR_OR_NULL(debugfs_parent)) return; for (i = 0; pid_files[i].name; i++) { debugfs_remove(pid_files[i].dentry); pid_files[i].dentry = NULL; } debugfs_remove(debugfs_parent); debugfs_parent = NULL; } /************************** debugfs end ************************/ /************************** sysfs begin ************************/ #define show_one(file_name, object) \ static ssize_t show_##file_name \ (struct kobject *kobj, struct attribute *attr, char *buf) \ { \ return sprintf(buf, "%u\n", global.object); \ } static ssize_t intel_pstate_show_status(char *buf); static int intel_pstate_update_status(const char *buf, size_t size); static ssize_t show_status(struct kobject *kobj, struct attribute *attr, char *buf) { ssize_t ret; mutex_lock(&intel_pstate_driver_lock); ret = intel_pstate_show_status(buf); mutex_unlock(&intel_pstate_driver_lock); return ret; } static ssize_t store_status(struct kobject *a, struct attribute *b, const char *buf, size_t count) { char *p = memchr(buf, '\n', count); int ret; mutex_lock(&intel_pstate_driver_lock); ret = intel_pstate_update_status(buf, p ? p - buf : count); mutex_unlock(&intel_pstate_driver_lock); return ret < 0 ? ret : count; } static ssize_t show_turbo_pct(struct kobject *kobj, struct attribute *attr, char *buf) { struct cpudata *cpu; int total, no_turbo, turbo_pct; uint32_t turbo_fp; mutex_lock(&intel_pstate_driver_lock); if (!intel_pstate_driver) { mutex_unlock(&intel_pstate_driver_lock); return -EAGAIN; } cpu = all_cpu_data[0]; total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; turbo_fp = div_fp(no_turbo, total); turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); mutex_unlock(&intel_pstate_driver_lock); return sprintf(buf, "%u\n", turbo_pct); } static ssize_t show_num_pstates(struct kobject *kobj, struct attribute *attr, char *buf) { struct cpudata *cpu; int total; mutex_lock(&intel_pstate_driver_lock); if (!intel_pstate_driver) { mutex_unlock(&intel_pstate_driver_lock); return -EAGAIN; } cpu = all_cpu_data[0]; total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; mutex_unlock(&intel_pstate_driver_lock); return sprintf(buf, "%u\n", total); } static ssize_t show_no_turbo(struct kobject *kobj, struct attribute *attr, char *buf) { ssize_t ret; mutex_lock(&intel_pstate_driver_lock); if (!intel_pstate_driver) { mutex_unlock(&intel_pstate_driver_lock); return -EAGAIN; } update_turbo_state(); if (global.turbo_disabled) ret = sprintf(buf, "%u\n", global.turbo_disabled); else ret = sprintf(buf, "%u\n", global.no_turbo); mutex_unlock(&intel_pstate_driver_lock); return ret; } static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, const char *buf, size_t count) { unsigned int input; int ret; ret = sscanf(buf, "%u", &input); if (ret != 1) return -EINVAL; mutex_lock(&intel_pstate_driver_lock); if (!intel_pstate_driver) { mutex_unlock(&intel_pstate_driver_lock); return -EAGAIN; } mutex_lock(&intel_pstate_limits_lock); update_turbo_state(); if (global.turbo_disabled) { pr_warn("Turbo disabled by BIOS or unavailable on processor\n"); mutex_unlock(&intel_pstate_limits_lock); mutex_unlock(&intel_pstate_driver_lock); return -EPERM; } global.no_turbo = clamp_t(int, input, 0, 1); if (global.no_turbo) { struct cpudata *cpu = all_cpu_data[0]; int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate; /* Squash the global minimum into the permitted range. */ if (global.min_perf_pct > pct) global.min_perf_pct = pct; } mutex_unlock(&intel_pstate_limits_lock); intel_pstate_update_policies(); mutex_unlock(&intel_pstate_driver_lock); return count; } static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, const char *buf, size_t count) { unsigned int input; int ret; ret = sscanf(buf, "%u", &input); if (ret != 1) return -EINVAL; mutex_lock(&intel_pstate_driver_lock); if (!intel_pstate_driver) { mutex_unlock(&intel_pstate_driver_lock); return -EAGAIN; } mutex_lock(&intel_pstate_limits_lock); global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100); mutex_unlock(&intel_pstate_limits_lock); intel_pstate_update_policies(); mutex_unlock(&intel_pstate_driver_lock); return count; } static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, const char *buf, size_t count) { unsigned int input; int ret; ret = sscanf(buf, "%u", &input); if (ret != 1) return -EINVAL; mutex_lock(&intel_pstate_driver_lock); if (!intel_pstate_driver) { mutex_unlock(&intel_pstate_driver_lock); return -EAGAIN; } mutex_lock(&intel_pstate_limits_lock); global.min_perf_pct = clamp_t(int, input, min_perf_pct_min(), global.max_perf_pct); mutex_unlock(&intel_pstate_limits_lock); intel_pstate_update_policies(); mutex_unlock(&intel_pstate_driver_lock); return count; } show_one(max_perf_pct, max_perf_pct); show_one(min_perf_pct, min_perf_pct); define_one_global_rw(status); define_one_global_rw(no_turbo); define_one_global_rw(max_perf_pct); define_one_global_rw(min_perf_pct); define_one_global_ro(turbo_pct); define_one_global_ro(num_pstates); static struct attribute *intel_pstate_attributes[] = { &status.attr, &no_turbo.attr, &turbo_pct.attr, &num_pstates.attr, NULL }; static struct attribute_group intel_pstate_attr_group = { .attrs = intel_pstate_attributes, }; static void __init intel_pstate_sysfs_expose_params(void) { struct kobject *intel_pstate_kobject; int rc; intel_pstate_kobject = kobject_create_and_add("intel_pstate", &cpu_subsys.dev_root->kobj); if (WARN_ON(!intel_pstate_kobject)) return; rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); if (WARN_ON(rc)) return; /* * If per cpu limits are enforced there are no global limits, so * return without creating max/min_perf_pct attributes */ if (per_cpu_limits) return; rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr); WARN_ON(rc); rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr); WARN_ON(rc); } /************************** sysfs end ************************/ static void intel_pstate_hwp_enable(struct cpudata *cpudata) { /* First disable HWP notification interrupt as we don't process them */ if (static_cpu_has(X86_FEATURE_HWP_NOTIFY)) wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); cpudata->epp_policy = 0; if (cpudata->epp_default == -EINVAL) cpudata->epp_default = intel_pstate_get_epp(cpudata, 0); } #define MSR_IA32_POWER_CTL_BIT_EE 19 /* Disable energy efficiency optimization */ static void intel_pstate_disable_ee(int cpu) { u64 power_ctl; int ret; ret = rdmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, &power_ctl); if (ret) return; if (!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE))) { pr_info("Disabling energy efficiency optimization\n"); power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE); wrmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, power_ctl); } } static int atom_get_min_pstate(void) { u64 value; rdmsrl(MSR_ATOM_CORE_RATIOS, value); return (value >> 8) & 0x7F; } static int atom_get_max_pstate(void) { u64 value; rdmsrl(MSR_ATOM_CORE_RATIOS, value); return (value >> 16) & 0x7F; } static int atom_get_turbo_pstate(void) { u64 value; rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value); return value & 0x7F; } static u64 atom_get_val(struct cpudata *cpudata, int pstate) { u64 val; int32_t vid_fp; u32 vid; val = (u64)pstate << 8; if (global.no_turbo && !global.turbo_disabled) val |= (u64)1 << 32; vid_fp = cpudata->vid.min + mul_fp( int_tofp(pstate - cpudata->pstate.min_pstate), cpudata->vid.ratio); vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); vid = ceiling_fp(vid_fp); if (pstate > cpudata->pstate.max_pstate) vid = cpudata->vid.turbo; return val | vid; } static int silvermont_get_scaling(void) { u64 value; int i; /* Defined in Table 35-6 from SDM (Sept 2015) */ static int silvermont_freq_table[] = { 83300, 100000, 133300, 116700, 80000}; rdmsrl(MSR_FSB_FREQ, value); i = value & 0x7; WARN_ON(i > 4); return silvermont_freq_table[i]; } static int airmont_get_scaling(void) { u64 value; int i; /* Defined in Table 35-10 from SDM (Sept 2015) */ static int airmont_freq_table[] = { 83300, 100000, 133300, 116700, 80000, 93300, 90000, 88900, 87500}; rdmsrl(MSR_FSB_FREQ, value); i = value & 0xF; WARN_ON(i > 8); return airmont_freq_table[i]; } static void atom_get_vid(struct cpudata *cpudata) { u64 value; rdmsrl(MSR_ATOM_CORE_VIDS, value); cpudata->vid.min = int_tofp((value >> 8) & 0x7f); cpudata->vid.max = int_tofp((value >> 16) & 0x7f); cpudata->vid.ratio = div_fp( cpudata->vid.max - cpudata->vid.min, int_tofp(cpudata->pstate.max_pstate - cpudata->pstate.min_pstate)); rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value); cpudata->vid.turbo = value & 0x7f; } static int core_get_min_pstate(void) { u64 value; rdmsrl(MSR_PLATFORM_INFO, value); return (value >> 40) & 0xFF; } static int core_get_max_pstate_physical(void) { u64 value; rdmsrl(MSR_PLATFORM_INFO, value); return (value >> 8) & 0xFF; } static int core_get_tdp_ratio(u64 plat_info) { /* Check how many TDP levels present */ if (plat_info & 0x600000000) { u64 tdp_ctrl; u64 tdp_ratio; int tdp_msr; int err; /* Get the TDP level (0, 1, 2) to get ratios */ err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl); if (err) return err; /* TDP MSR are continuous starting at 0x648 */ tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03); err = rdmsrl_safe(tdp_msr, &tdp_ratio); if (err) return err; /* For level 1 and 2, bits[23:16] contain the ratio */ if (tdp_ctrl & 0x03) tdp_ratio >>= 16; tdp_ratio &= 0xff; /* ratios are only 8 bits long */ pr_debug("tdp_ratio %x\n", (int)tdp_ratio); return (int)tdp_ratio; } return -ENXIO; } static int core_get_max_pstate(void) { u64 tar; u64 plat_info; int max_pstate; int tdp_ratio; int err; rdmsrl(MSR_PLATFORM_INFO, plat_info); max_pstate = (plat_info >> 8) & 0xFF; tdp_ratio = core_get_tdp_ratio(plat_info); if (tdp_ratio <= 0) return max_pstate; if (hwp_active) { /* Turbo activation ratio is not used on HWP platforms */ return tdp_ratio; } err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar); if (!err) { int tar_levels; /* Do some sanity checking for safety */ tar_levels = tar & 0xff; if (tdp_ratio - 1 == tar_levels) { max_pstate = tar_levels; pr_debug("max_pstate=TAC %x\n", max_pstate); } } return max_pstate; } static int core_get_turbo_pstate(void) { u64 value; int nont, ret; rdmsrl(MSR_TURBO_RATIO_LIMIT, value); nont = core_get_max_pstate(); ret = (value) & 255; if (ret <= nont) ret = nont; return ret; } static inline int core_get_scaling(void) { return 100000; } static u64 core_get_val(struct cpudata *cpudata, int pstate) { u64 val; val = (u64)pstate << 8; if (global.no_turbo && !global.turbo_disabled) val |= (u64)1 << 32; return val; } static int knl_get_turbo_pstate(void) { u64 value; int nont, ret; rdmsrl(MSR_TURBO_RATIO_LIMIT, value); nont = core_get_max_pstate(); ret = (((value) >> 8) & 0xFF); if (ret <= nont) ret = nont; return ret; } static int intel_pstate_get_base_pstate(struct cpudata *cpu) { return global.no_turbo || global.turbo_disabled ? cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; } static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) { trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); cpu->pstate.current_pstate = pstate; /* * Generally, there is no guarantee that this code will always run on * the CPU being updated, so force the register update to run on the * right CPU. */ wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate)); } static void intel_pstate_set_min_pstate(struct cpudata *cpu) { intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); } static void intel_pstate_max_within_limits(struct cpudata *cpu) { int pstate; update_turbo_state(); pstate = intel_pstate_get_base_pstate(cpu); pstate = max(cpu->pstate.min_pstate, fp_ext_toint(pstate * cpu->max_perf)); intel_pstate_set_pstate(cpu, pstate); } static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) { cpu->pstate.min_pstate = pstate_funcs.get_min(); cpu->pstate.max_pstate = pstate_funcs.get_max(); cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical(); cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); cpu->pstate.scaling = pstate_funcs.get_scaling(); cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling; cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling; if (pstate_funcs.get_vid) pstate_funcs.get_vid(cpu); intel_pstate_set_min_pstate(cpu); } static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu) { struct sample *sample = &cpu->sample; sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf); } static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) { u64 aperf, mperf; unsigned long flags; u64 tsc; local_irq_save(flags); rdmsrl(MSR_IA32_APERF, aperf); rdmsrl(MSR_IA32_MPERF, mperf); tsc = rdtsc(); if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) { local_irq_restore(flags); return false; } local_irq_restore(flags); cpu->last_sample_time = cpu->sample.time; cpu->sample.time = time; cpu->sample.aperf = aperf; cpu->sample.mperf = mperf; cpu->sample.tsc = tsc; cpu->sample.aperf -= cpu->prev_aperf; cpu->sample.mperf -= cpu->prev_mperf; cpu->sample.tsc -= cpu->prev_tsc; cpu->prev_aperf = aperf; cpu->prev_mperf = mperf; cpu->prev_tsc = tsc; /* * First time this function is invoked in a given cycle, all of the * previous sample data fields are equal to zero or stale and they must * be populated with meaningful numbers for things to work, so assume * that sample.time will always be reset before setting the utilization * update hook and make the caller skip the sample then. */ if (cpu->last_sample_time) { intel_pstate_calc_avg_perf(cpu); return true; } return false; } static inline int32_t get_avg_frequency(struct cpudata *cpu) { return mul_ext_fp(cpu->sample.core_avg_perf, cpu->pstate.max_pstate_physical * cpu->pstate.scaling); } static inline int32_t get_avg_pstate(struct cpudata *cpu) { return mul_ext_fp(cpu->pstate.max_pstate_physical, cpu->sample.core_avg_perf); } static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) { struct sample *sample = &cpu->sample; int32_t busy_frac, boost; int target, avg_pstate; if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) return cpu->pstate.turbo_pstate; busy_frac = div_fp(sample->mperf, sample->tsc); boost = cpu->iowait_boost; cpu->iowait_boost >>= 1; if (busy_frac < boost) busy_frac = boost; sample->busy_scaled = busy_frac * 100; target = global.no_turbo || global.turbo_disabled ? cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; target += target >> 2; target = mul_fp(target, busy_frac); if (target < cpu->pstate.min_pstate) target = cpu->pstate.min_pstate; /* * If the average P-state during the previous cycle was higher than the * current target, add 50% of the difference to the target to reduce * possible performance oscillations and offset possible performance * loss related to moving the workload from one CPU to another within * a package/module. */ avg_pstate = get_avg_pstate(cpu); if (avg_pstate > target) target += (avg_pstate - target) >> 1; return target; } static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) { int32_t perf_scaled, max_pstate, current_pstate, sample_ratio; u64 duration_ns; if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) return cpu->pstate.turbo_pstate; /* * perf_scaled is the ratio of the average P-state during the last * sampling period to the P-state requested last time (in percent). * * That measures the system's response to the previous P-state * selection. */ max_pstate = cpu->pstate.max_pstate_physical; current_pstate = cpu->pstate.current_pstate; perf_scaled = mul_ext_fp(cpu->sample.core_avg_perf, div_fp(100 * max_pstate, current_pstate)); /* * Since our utilization update callback will not run unless we are * in C0, check if the actual elapsed time is significantly greater (3x) * than our sample interval. If it is, then we were idle for a long * enough period of time to adjust our performance metric. */ duration_ns = cpu->sample.time - cpu->last_sample_time; if ((s64)duration_ns > pid_params.sample_rate_ns * 3) { sample_ratio = div_fp(pid_params.sample_rate_ns, duration_ns); perf_scaled = mul_fp(perf_scaled, sample_ratio); } else { sample_ratio = div_fp(100 * cpu->sample.mperf, cpu->sample.tsc); if (sample_ratio < int_tofp(1)) perf_scaled = 0; } cpu->sample.busy_scaled = perf_scaled; return cpu->pstate.current_pstate - pid_calc(&cpu->pid, perf_scaled); } static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate) { int max_pstate = intel_pstate_get_base_pstate(cpu); int min_pstate; min_pstate = max(cpu->pstate.min_pstate, fp_ext_toint(max_pstate * cpu->min_perf)); max_pstate = max(min_pstate, fp_ext_toint(max_pstate * cpu->max_perf)); return clamp_t(int, pstate, min_pstate, max_pstate); } static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate) { if (pstate == cpu->pstate.current_pstate) return; cpu->pstate.current_pstate = pstate; wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate)); } static void intel_pstate_adjust_pstate(struct cpudata *cpu, int target_pstate) { int from = cpu->pstate.current_pstate; struct sample *sample; update_turbo_state(); target_pstate = intel_pstate_prepare_request(cpu, target_pstate); trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu); intel_pstate_update_pstate(cpu, target_pstate); sample = &cpu->sample; trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf), fp_toint(sample->busy_scaled), from, cpu->pstate.current_pstate, sample->mperf, sample->aperf, sample->tsc, get_avg_frequency(cpu), fp_toint(cpu->iowait_boost * 100)); } static void intel_pstate_update_util_hwp(struct update_util_data *data, u64 time, unsigned int flags) { struct cpudata *cpu = container_of(data, struct cpudata, update_util); u64 delta_ns = time - cpu->sample.time; if ((s64)delta_ns >= INTEL_PSTATE_HWP_SAMPLING_INTERVAL) intel_pstate_sample(cpu, time); } static void intel_pstate_update_util_pid(struct update_util_data *data, u64 time, unsigned int flags) { struct cpudata *cpu = container_of(data, struct cpudata, update_util); u64 delta_ns = time - cpu->sample.time; if ((s64)delta_ns < pid_params.sample_rate_ns) return; if (intel_pstate_sample(cpu, time)) { int target_pstate; target_pstate = get_target_pstate_use_performance(cpu); intel_pstate_adjust_pstate(cpu, target_pstate); } } static void intel_pstate_update_util(struct update_util_data *data, u64 time, unsigned int flags) { struct cpudata *cpu = container_of(data, struct cpudata, update_util); u64 delta_ns; if (flags & SCHED_CPUFREQ_IOWAIT) { cpu->iowait_boost = int_tofp(1); } else if (cpu->iowait_boost) { /* Clear iowait_boost if the CPU may have been idle. */ delta_ns = time - cpu->last_update; if (delta_ns > TICK_NSEC) cpu->iowait_boost = 0; } cpu->last_update = time; delta_ns = time - cpu->sample.time; if ((s64)delta_ns < INTEL_PSTATE_DEFAULT_SAMPLING_INTERVAL) return; if (intel_pstate_sample(cpu, time)) { int target_pstate; target_pstate = get_target_pstate_use_cpu_load(cpu); intel_pstate_adjust_pstate(cpu, target_pstate); } } static struct pstate_funcs core_funcs = { .get_max = core_get_max_pstate, .get_max_physical = core_get_max_pstate_physical, .get_min = core_get_min_pstate, .get_turbo = core_get_turbo_pstate, .get_scaling = core_get_scaling, .get_val = core_get_val, .update_util = intel_pstate_update_util_pid, }; static const struct pstate_funcs silvermont_funcs = { .get_max = atom_get_max_pstate, .get_max_physical = atom_get_max_pstate, .get_min = atom_get_min_pstate, .get_turbo = atom_get_turbo_pstate, .get_val = atom_get_val, .get_scaling = silvermont_get_scaling, .get_vid = atom_get_vid, .update_util = intel_pstate_update_util, }; static const struct pstate_funcs airmont_funcs = { .get_max = atom_get_max_pstate, .get_max_physical = atom_get_max_pstate, .get_min = atom_get_min_pstate, .get_turbo = atom_get_turbo_pstate, .get_val = atom_get_val, .get_scaling = airmont_get_scaling, .get_vid = atom_get_vid, .update_util = intel_pstate_update_util, }; static const struct pstate_funcs knl_funcs = { .get_max = core_get_max_pstate, .get_max_physical = core_get_max_pstate_physical, .get_min = core_get_min_pstate, .get_turbo = knl_get_turbo_pstate, .get_scaling = core_get_scaling, .get_val = core_get_val, .update_util = intel_pstate_update_util_pid, }; static const struct pstate_funcs bxt_funcs = { .get_max = core_get_max_pstate, .get_max_physical = core_get_max_pstate_physical, .get_min = core_get_min_pstate, .get_turbo = core_get_turbo_pstate, .get_scaling = core_get_scaling, .get_val = core_get_val, .update_util = intel_pstate_update_util, }; #define ICPU(model, policy) \ { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ (unsigned long)&policy } static const struct x86_cpu_id intel_pstate_cpu_ids[] = { ICPU(INTEL_FAM6_SANDYBRIDGE, core_funcs), ICPU(INTEL_FAM6_SANDYBRIDGE_X, core_funcs), ICPU(INTEL_FAM6_ATOM_SILVERMONT1, silvermont_funcs), ICPU(INTEL_FAM6_IVYBRIDGE, core_funcs), ICPU(INTEL_FAM6_HASWELL_CORE, core_funcs), ICPU(INTEL_FAM6_BROADWELL_CORE, core_funcs), ICPU(INTEL_FAM6_IVYBRIDGE_X, core_funcs), ICPU(INTEL_FAM6_HASWELL_X, core_funcs), ICPU(INTEL_FAM6_HASWELL_ULT, core_funcs), ICPU(INTEL_FAM6_HASWELL_GT3E, core_funcs), ICPU(INTEL_FAM6_BROADWELL_GT3E, core_funcs), ICPU(INTEL_FAM6_ATOM_AIRMONT, airmont_funcs), ICPU(INTEL_FAM6_SKYLAKE_MOBILE, core_funcs), ICPU(INTEL_FAM6_BROADWELL_X, core_funcs), ICPU(INTEL_FAM6_SKYLAKE_DESKTOP, core_funcs), ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs), ICPU(INTEL_FAM6_XEON_PHI_KNL, knl_funcs), ICPU(INTEL_FAM6_XEON_PHI_KNM, knl_funcs), ICPU(INTEL_FAM6_ATOM_GOLDMONT, bxt_funcs), ICPU(INTEL_FAM6_ATOM_GEMINI_LAKE, bxt_funcs), {} }; MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = { ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs), ICPU(INTEL_FAM6_BROADWELL_X, core_funcs), ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs), {} }; static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = { ICPU(INTEL_FAM6_KABYLAKE_DESKTOP, core_funcs), {} }; static bool pid_in_use(void); static int intel_pstate_init_cpu(unsigned int cpunum) { struct cpudata *cpu; cpu = all_cpu_data[cpunum]; if (!cpu) { cpu = kzalloc(sizeof(*cpu), GFP_KERNEL); if (!cpu) return -ENOMEM; all_cpu_data[cpunum] = cpu; cpu->epp_default = -EINVAL; cpu->epp_powersave = -EINVAL; cpu->epp_saved = -EINVAL; } cpu = all_cpu_data[cpunum]; cpu->cpu = cpunum; if (hwp_active) { const struct x86_cpu_id *id; id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids); if (id) intel_pstate_disable_ee(cpunum); intel_pstate_hwp_enable(cpu); } else if (pid_in_use()) { intel_pstate_pid_reset(cpu); } intel_pstate_get_cpu_pstates(cpu); pr_debug("controlling: cpu %d\n", cpunum); return 0; } static unsigned int intel_pstate_get(unsigned int cpu_num) { struct cpudata *cpu = all_cpu_data[cpu_num]; return cpu ? get_avg_frequency(cpu) : 0; } static void intel_pstate_set_update_util_hook(unsigned int cpu_num) { struct cpudata *cpu = all_cpu_data[cpu_num]; if (cpu->update_util_set) return; /* Prevent intel_pstate_update_util() from using stale data. */ cpu->sample.time = 0; cpufreq_add_update_util_hook(cpu_num, &cpu->update_util, pstate_funcs.update_util); cpu->update_util_set = true; } static void intel_pstate_clear_update_util_hook(unsigned int cpu) { struct cpudata *cpu_data = all_cpu_data[cpu]; if (!cpu_data->update_util_set) return; cpufreq_remove_update_util_hook(cpu); cpu_data->update_util_set = false; synchronize_sched(); } static int intel_pstate_get_max_freq(struct cpudata *cpu) { return global.turbo_disabled || global.no_turbo ? cpu->pstate.max_freq : cpu->pstate.turbo_freq; } static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy, struct cpudata *cpu) { int max_freq = intel_pstate_get_max_freq(cpu); int32_t max_policy_perf, min_policy_perf; max_policy_perf = div_ext_fp(policy->max, max_freq); max_policy_perf = clamp_t(int32_t, max_policy_perf, 0, int_ext_tofp(1)); if (policy->max == policy->min) { min_policy_perf = max_policy_perf; } else { min_policy_perf = div_ext_fp(policy->min, max_freq); min_policy_perf = clamp_t(int32_t, min_policy_perf, 0, max_policy_perf); } /* Normalize user input to [min_perf, max_perf] */ if (per_cpu_limits) { cpu->min_perf = min_policy_perf; cpu->max_perf = max_policy_perf; } else { int32_t global_min, global_max; /* Global limits are in percent of the maximum turbo P-state. */ global_max = percent_ext_fp(global.max_perf_pct); global_min = percent_ext_fp(global.min_perf_pct); if (max_freq != cpu->pstate.turbo_freq) { int32_t turbo_factor; turbo_factor = div_ext_fp(cpu->pstate.turbo_pstate, cpu->pstate.max_pstate); global_min = mul_ext_fp(global_min, turbo_factor); global_max = mul_ext_fp(global_max, turbo_factor); } global_min = clamp_t(int32_t, global_min, 0, global_max); cpu->min_perf = max(min_policy_perf, global_min); cpu->min_perf = min(cpu->min_perf, max_policy_perf); cpu->max_perf = min(max_policy_perf, global_max); cpu->max_perf = max(min_policy_perf, cpu->max_perf); /* Make sure min_perf <= max_perf */ cpu->min_perf = min(cpu->min_perf, cpu->max_perf); } cpu->max_perf = round_up(cpu->max_perf, EXT_FRAC_BITS); cpu->min_perf = round_up(cpu->min_perf, EXT_FRAC_BITS); pr_debug("cpu:%d max_perf_pct:%d min_perf_pct:%d\n", policy->cpu, fp_ext_toint(cpu->max_perf * 100), fp_ext_toint(cpu->min_perf * 100)); } static int intel_pstate_set_policy(struct cpufreq_policy *policy) { struct cpudata *cpu; if (!policy->cpuinfo.max_freq) return -ENODEV; pr_debug("set_policy cpuinfo.max %u policy->max %u\n", policy->cpuinfo.max_freq, policy->max); cpu = all_cpu_data[policy->cpu]; cpu->policy = policy->policy; mutex_lock(&intel_pstate_limits_lock); intel_pstate_update_perf_limits(policy, cpu); if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) { /* * NOHZ_FULL CPUs need this as the governor callback may not * be invoked on them. */ intel_pstate_clear_update_util_hook(policy->cpu); intel_pstate_max_within_limits(cpu); } intel_pstate_set_update_util_hook(policy->cpu); if (hwp_active) intel_pstate_hwp_set(policy->cpu); mutex_unlock(&intel_pstate_limits_lock); return 0; } static void intel_pstate_adjust_policy_max(struct cpufreq_policy *policy, struct cpudata *cpu) { if (cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate && policy->max < policy->cpuinfo.max_freq && policy->max > cpu->pstate.max_freq) { pr_debug("policy->max > max non turbo frequency\n"); policy->max = policy->cpuinfo.max_freq; } } static int intel_pstate_verify_policy(struct cpufreq_policy *policy) { struct cpudata *cpu = all_cpu_data[policy->cpu]; update_turbo_state(); cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, intel_pstate_get_max_freq(cpu)); if (policy->policy != CPUFREQ_POLICY_POWERSAVE && policy->policy != CPUFREQ_POLICY_PERFORMANCE) return -EINVAL; intel_pstate_adjust_policy_max(policy, cpu); return 0; } static void intel_cpufreq_stop_cpu(struct cpufreq_policy *policy) { intel_pstate_set_min_pstate(all_cpu_data[policy->cpu]); } static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) { pr_debug("CPU %d exiting\n", policy->cpu); intel_pstate_clear_update_util_hook(policy->cpu); if (hwp_active) intel_pstate_hwp_save_state(policy); else intel_cpufreq_stop_cpu(policy); } static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) { intel_pstate_exit_perf_limits(policy); policy->fast_switch_possible = false; return 0; } static int __intel_pstate_cpu_init(struct cpufreq_policy *policy) { struct cpudata *cpu; int rc; rc = intel_pstate_init_cpu(policy->cpu); if (rc) return rc; cpu = all_cpu_data[policy->cpu]; cpu->max_perf = int_ext_tofp(1); cpu->min_perf = 0; policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; /* cpuinfo and default policy values */ policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; update_turbo_state(); policy->cpuinfo.max_freq = global.turbo_disabled ? cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; policy->cpuinfo.max_freq *= cpu->pstate.scaling; intel_pstate_init_acpi_perf_limits(policy); cpumask_set_cpu(policy->cpu, policy->cpus); policy->fast_switch_possible = true; return 0; } static int intel_pstate_cpu_init(struct cpufreq_policy *policy) { int ret = __intel_pstate_cpu_init(policy); if (ret) return ret; policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; if (IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE)) policy->policy = CPUFREQ_POLICY_PERFORMANCE; else policy->policy = CPUFREQ_POLICY_POWERSAVE; return 0; } static struct cpufreq_driver intel_pstate = { .flags = CPUFREQ_CONST_LOOPS, .verify = intel_pstate_verify_policy, .setpolicy = intel_pstate_set_policy, .suspend = intel_pstate_hwp_save_state, .resume = intel_pstate_resume, .get = intel_pstate_get, .init = intel_pstate_cpu_init, .exit = intel_pstate_cpu_exit, .stop_cpu = intel_pstate_stop_cpu, .name = "intel_pstate", }; static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy) { struct cpudata *cpu = all_cpu_data[policy->cpu]; update_turbo_state(); cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, intel_pstate_get_max_freq(cpu)); intel_pstate_adjust_policy_max(policy, cpu); intel_pstate_update_perf_limits(policy, cpu); return 0; } static int intel_cpufreq_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { struct cpudata *cpu = all_cpu_data[policy->cpu]; struct cpufreq_freqs freqs; int target_pstate; update_turbo_state(); freqs.old = policy->cur; freqs.new = target_freq; cpufreq_freq_transition_begin(policy, &freqs); switch (relation) { case CPUFREQ_RELATION_L: target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling); break; case CPUFREQ_RELATION_H: target_pstate = freqs.new / cpu->pstate.scaling; break; default: target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling); break; } target_pstate = intel_pstate_prepare_request(cpu, target_pstate); if (target_pstate != cpu->pstate.current_pstate) { cpu->pstate.current_pstate = target_pstate; wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, target_pstate)); } freqs.new = target_pstate * cpu->pstate.scaling; cpufreq_freq_transition_end(policy, &freqs, false); return 0; } static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy, unsigned int target_freq) { struct cpudata *cpu = all_cpu_data[policy->cpu]; int target_pstate; update_turbo_state(); target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling); target_pstate = intel_pstate_prepare_request(cpu, target_pstate); intel_pstate_update_pstate(cpu, target_pstate); return target_pstate * cpu->pstate.scaling; } static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) { int ret = __intel_pstate_cpu_init(policy); if (ret) return ret; policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY; policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY; /* This reflects the intel_pstate_get_cpu_pstates() setting. */ policy->cur = policy->cpuinfo.min_freq; return 0; } static struct cpufreq_driver intel_cpufreq = { .flags = CPUFREQ_CONST_LOOPS, .verify = intel_cpufreq_verify_policy, .target = intel_cpufreq_target, .fast_switch = intel_cpufreq_fast_switch, .init = intel_cpufreq_cpu_init, .exit = intel_pstate_cpu_exit, .stop_cpu = intel_cpufreq_stop_cpu, .name = "intel_cpufreq", }; static struct cpufreq_driver *default_driver = &intel_pstate; static bool pid_in_use(void) { return intel_pstate_driver == &intel_pstate && pstate_funcs.update_util == intel_pstate_update_util_pid; } static void intel_pstate_driver_cleanup(void) { unsigned int cpu; get_online_cpus(); for_each_online_cpu(cpu) { if (all_cpu_data[cpu]) { if (intel_pstate_driver == &intel_pstate) intel_pstate_clear_update_util_hook(cpu); kfree(all_cpu_data[cpu]); all_cpu_data[cpu] = NULL; } } put_online_cpus(); intel_pstate_driver = NULL; } static int intel_pstate_register_driver(struct cpufreq_driver *driver) { int ret; memset(&global, 0, sizeof(global)); global.max_perf_pct = 100; intel_pstate_driver = driver; ret = cpufreq_register_driver(intel_pstate_driver); if (ret) { intel_pstate_driver_cleanup(); return ret; } global.min_perf_pct = min_perf_pct_min(); if (pid_in_use()) intel_pstate_debug_expose_params(); return 0; } static int intel_pstate_unregister_driver(void) { if (hwp_active) return -EBUSY; if (pid_in_use()) intel_pstate_debug_hide_params(); cpufreq_unregister_driver(intel_pstate_driver); intel_pstate_driver_cleanup(); return 0; } static ssize_t intel_pstate_show_status(char *buf) { if (!intel_pstate_driver) return sprintf(buf, "off\n"); return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ? "active" : "passive"); } static int intel_pstate_update_status(const char *buf, size_t size) { int ret; if (size == 3 && !strncmp(buf, "off", size)) return intel_pstate_driver ? intel_pstate_unregister_driver() : -EINVAL; if (size == 6 && !strncmp(buf, "active", size)) { if (intel_pstate_driver) { if (intel_pstate_driver == &intel_pstate) return 0; ret = intel_pstate_unregister_driver(); if (ret) return ret; } return intel_pstate_register_driver(&intel_pstate); } if (size == 7 && !strncmp(buf, "passive", size)) { if (intel_pstate_driver) { if (intel_pstate_driver == &intel_cpufreq) return 0; ret = intel_pstate_unregister_driver(); if (ret) return ret; } return intel_pstate_register_driver(&intel_cpufreq); } return -EINVAL; } static int no_load __initdata; static int no_hwp __initdata; static int hwp_only __initdata; static unsigned int force_load __initdata; static int __init intel_pstate_msrs_not_valid(void) { if (!pstate_funcs.get_max() || !pstate_funcs.get_min() || !pstate_funcs.get_turbo()) return -ENODEV; return 0; } #ifdef CONFIG_ACPI static void intel_pstate_use_acpi_profile(void) { switch (acpi_gbl_FADT.preferred_profile) { case PM_MOBILE: case PM_TABLET: case PM_APPLIANCE_PC: case PM_DESKTOP: case PM_WORKSTATION: pstate_funcs.update_util = intel_pstate_update_util; } } #else static void intel_pstate_use_acpi_profile(void) { } #endif static void __init copy_cpu_funcs(struct pstate_funcs *funcs) { pstate_funcs.get_max = funcs->get_max; pstate_funcs.get_max_physical = funcs->get_max_physical; pstate_funcs.get_min = funcs->get_min; pstate_funcs.get_turbo = funcs->get_turbo; pstate_funcs.get_scaling = funcs->get_scaling; pstate_funcs.get_val = funcs->get_val; pstate_funcs.get_vid = funcs->get_vid; pstate_funcs.update_util = funcs->update_util; intel_pstate_use_acpi_profile(); } #ifdef CONFIG_ACPI static bool __init intel_pstate_no_acpi_pss(void) { int i; for_each_possible_cpu(i) { acpi_status status; union acpi_object *pss; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_processor *pr = per_cpu(processors, i); if (!pr) continue; status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); if (ACPI_FAILURE(status)) continue; pss = buffer.pointer; if (pss && pss->type == ACPI_TYPE_PACKAGE) { kfree(pss); return false; } kfree(pss); } return true; } static bool __init intel_pstate_has_acpi_ppc(void) { int i; for_each_possible_cpu(i) { struct acpi_processor *pr = per_cpu(processors, i); if (!pr) continue; if (acpi_has_method(pr->handle, "_PPC")) return true; } return false; } enum { PSS, PPC, }; struct hw_vendor_info { u16 valid; char oem_id[ACPI_OEM_ID_SIZE]; char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; int oem_pwr_table; }; /* Hardware vendor-specific info that has its own power management modes */ static struct hw_vendor_info vendor_info[] __initdata = { {1, "HP ", "ProLiant", PSS}, {1, "ORACLE", "X4-2 ", PPC}, {1, "ORACLE", "X4-2L ", PPC}, {1, "ORACLE", "X4-2B ", PPC}, {1, "ORACLE", "X3-2 ", PPC}, {1, "ORACLE", "X3-2L ", PPC}, {1, "ORACLE", "X3-2B ", PPC}, {1, "ORACLE", "X4470M2 ", PPC}, {1, "ORACLE", "X4270M3 ", PPC}, {1, "ORACLE", "X4270M2 ", PPC}, {1, "ORACLE", "X4170M2 ", PPC}, {1, "ORACLE", "X4170 M3", PPC}, {1, "ORACLE", "X4275 M3", PPC}, {1, "ORACLE", "X6-2 ", PPC}, {1, "ORACLE", "Sudbury ", PPC}, {0, "", ""}, }; static bool __init intel_pstate_platform_pwr_mgmt_exists(void) { struct acpi_table_header hdr; struct hw_vendor_info *v_info; const struct x86_cpu_id *id; u64 misc_pwr; id = x86_match_cpu(intel_pstate_cpu_oob_ids); if (id) { rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); if ( misc_pwr & (1 << 8)) return true; } if (acpi_disabled || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) return false; for (v_info = vendor_info; v_info->valid; v_info++) { if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) switch (v_info->oem_pwr_table) { case PSS: return intel_pstate_no_acpi_pss(); case PPC: return intel_pstate_has_acpi_ppc() && (!force_load); } } return false; } static void intel_pstate_request_control_from_smm(void) { /* * It may be unsafe to request P-states control from SMM if _PPC support * has not been enabled. */ if (acpi_ppc) acpi_processor_pstate_control(); } #else /* CONFIG_ACPI not enabled */ static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } static inline bool intel_pstate_has_acpi_ppc(void) { return false; } static inline void intel_pstate_request_control_from_smm(void) {} #endif /* CONFIG_ACPI */ static const struct x86_cpu_id hwp_support_ids[] __initconst = { { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP }, {} }; static int __init intel_pstate_init(void) { int rc; if (no_load) return -ENODEV; if (x86_match_cpu(hwp_support_ids)) { copy_cpu_funcs(&core_funcs); if (no_hwp) { pstate_funcs.update_util = intel_pstate_update_util; } else { hwp_active++; intel_pstate.attr = hwp_cpufreq_attrs; pstate_funcs.update_util = intel_pstate_update_util_hwp; goto hwp_cpu_matched; } } else { const struct x86_cpu_id *id; id = x86_match_cpu(intel_pstate_cpu_ids); if (!id) return -ENODEV; copy_cpu_funcs((struct pstate_funcs *)id->driver_data); } if (intel_pstate_msrs_not_valid()) return -ENODEV; hwp_cpu_matched: /* * The Intel pstate driver will be ignored if the platform * firmware has its own power management modes. */ if (intel_pstate_platform_pwr_mgmt_exists()) return -ENODEV; if (!hwp_active && hwp_only) return -ENOTSUPP; pr_info("Intel P-state driver initializing\n"); all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); if (!all_cpu_data) return -ENOMEM; intel_pstate_request_control_from_smm(); intel_pstate_sysfs_expose_params(); mutex_lock(&intel_pstate_driver_lock); rc = intel_pstate_register_driver(default_driver); mutex_unlock(&intel_pstate_driver_lock); if (rc) return rc; if (hwp_active) pr_info("HWP enabled\n"); return 0; } device_initcall(intel_pstate_init); static int __init intel_pstate_setup(char *str) { if (!str) return -EINVAL; if (!strcmp(str, "disable")) { no_load = 1; } else if (!strcmp(str, "passive")) { pr_info("Passive mode enabled\n"); default_driver = &intel_cpufreq; no_hwp = 1; } if (!strcmp(str, "no_hwp")) { pr_info("HWP disabled\n"); no_hwp = 1; } if (!strcmp(str, "force")) force_load = 1; if (!strcmp(str, "hwp_only")) hwp_only = 1; if (!strcmp(str, "per_cpu_perf_limits")) per_cpu_limits = true; #ifdef CONFIG_ACPI if (!strcmp(str, "support_acpi_ppc")) acpi_ppc = true; #endif return 0; } early_param("intel_pstate", intel_pstate_setup); MODULE_AUTHOR("Dirk Brandewie "); MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); MODULE_LICENSE("GPL");