1 // SPDX-License-Identifier: GPL-2.0-only
3 * intel_pstate.c: Native P state management for Intel processors
5 * (C) Copyright 2012 Intel Corporation
6 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/kernel.h>
12 #include <linux/kernel_stat.h>
13 #include <linux/module.h>
14 #include <linux/ktime.h>
15 #include <linux/hrtimer.h>
16 #include <linux/tick.h>
17 #include <linux/slab.h>
18 #include <linux/sched/cpufreq.h>
19 #include <linux/list.h>
20 #include <linux/cpu.h>
21 #include <linux/cpufreq.h>
22 #include <linux/sysfs.h>
23 #include <linux/types.h>
25 #include <linux/acpi.h>
26 #include <linux/vmalloc.h>
27 #include <linux/pm_qos.h>
28 #include <trace/events/power.h>
30 #include <asm/div64.h>
32 #include <asm/cpu_device_id.h>
33 #include <asm/cpufeature.h>
34 #include <asm/intel-family.h>
36 #define INTEL_PSTATE_SAMPLING_INTERVAL (10 * NSEC_PER_MSEC)
38 #define INTEL_CPUFREQ_TRANSITION_LATENCY 20000
39 #define INTEL_CPUFREQ_TRANSITION_DELAY_HWP 5000
40 #define INTEL_CPUFREQ_TRANSITION_DELAY 500
43 #include <acpi/processor.h>
44 #include <acpi/cppc_acpi.h>
48 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
49 #define fp_toint(X) ((X) >> FRAC_BITS)
51 #define ONE_EIGHTH_FP ((int64_t)1 << (FRAC_BITS - 3))
54 #define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS)
55 #define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS)
56 #define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS)
58 static inline int32_t mul_fp(int32_t x, int32_t y)
60 return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
63 static inline int32_t div_fp(s64 x, s64 y)
65 return div64_s64((int64_t)x << FRAC_BITS, y);
68 static inline int ceiling_fp(int32_t x)
73 mask = (1 << FRAC_BITS) - 1;
79 static inline int32_t percent_fp(int percent)
81 return div_fp(percent, 100);
84 static inline u64 mul_ext_fp(u64 x, u64 y)
86 return (x * y) >> EXT_FRAC_BITS;
89 static inline u64 div_ext_fp(u64 x, u64 y)
91 return div64_u64(x << EXT_FRAC_BITS, y);
94 static inline int32_t percent_ext_fp(int percent)
96 return div_ext_fp(percent, 100);
100 * struct sample - Store performance sample
101 * @core_avg_perf: Ratio of APERF/MPERF which is the actual average
102 * performance during last sample period
103 * @busy_scaled: Scaled busy value which is used to calculate next
104 * P state. This can be different than core_avg_perf
105 * to account for cpu idle period
106 * @aperf: Difference of actual performance frequency clock count
107 * read from APERF MSR between last and current sample
108 * @mperf: Difference of maximum performance frequency clock count
109 * read from MPERF MSR between last and current sample
110 * @tsc: Difference of time stamp counter between last and
112 * @time: Current time from scheduler
114 * This structure is used in the cpudata structure to store performance sample
115 * data for choosing next P State.
118 int32_t core_avg_perf;
127 * struct pstate_data - Store P state data
128 * @current_pstate: Current requested P state
129 * @min_pstate: Min P state possible for this platform
130 * @max_pstate: Max P state possible for this platform
131 * @max_pstate_physical:This is physical Max P state for a processor
132 * This can be higher than the max_pstate which can
133 * be limited by platform thermal design power limits
134 * @scaling: Scaling factor to convert frequency to cpufreq
136 * @turbo_pstate: Max Turbo P state possible for this platform
137 * @max_freq: @max_pstate frequency in cpufreq units
138 * @turbo_freq: @turbo_pstate frequency in cpufreq units
140 * Stores the per cpu model P state limits and current P state.
146 int max_pstate_physical;
149 unsigned int max_freq;
150 unsigned int turbo_freq;
154 * struct vid_data - Stores voltage information data
155 * @min: VID data for this platform corresponding to
157 * @max: VID data corresponding to the highest P State.
158 * @turbo: VID data for turbo P state
159 * @ratio: Ratio of (vid max - vid min) /
160 * (max P state - Min P State)
162 * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling)
163 * This data is used in Atom platforms, where in addition to target P state,
164 * the voltage data needs to be specified to select next P State.
174 * struct global_params - Global parameters, mostly tunable via sysfs.
175 * @no_turbo: Whether or not to use turbo P-states.
176 * @turbo_disabled: Whether or not turbo P-states are available at all,
177 * based on the MSR_IA32_MISC_ENABLE value and whether or
178 * not the maximum reported turbo P-state is different from
179 * the maximum reported non-turbo one.
180 * @turbo_disabled_mf: The @turbo_disabled value reflected by cpuinfo.max_freq.
181 * @min_perf_pct: Minimum capacity limit in percent of the maximum turbo
183 * @max_perf_pct: Maximum capacity limit in percent of the maximum turbo
186 struct global_params {
189 bool turbo_disabled_mf;
195 * struct cpudata - Per CPU instance data storage
196 * @cpu: CPU number for this instance data
197 * @policy: CPUFreq policy value
198 * @update_util: CPUFreq utility callback information
199 * @update_util_set: CPUFreq utility callback is set
200 * @iowait_boost: iowait-related boost fraction
201 * @last_update: Time of the last update.
202 * @pstate: Stores P state limits for this CPU
203 * @vid: Stores VID limits for this CPU
204 * @last_sample_time: Last Sample time
205 * @aperf_mperf_shift: APERF vs MPERF counting frequency difference
206 * @prev_aperf: Last APERF value read from APERF MSR
207 * @prev_mperf: Last MPERF value read from MPERF MSR
208 * @prev_tsc: Last timestamp counter (TSC) value
209 * @prev_cummulative_iowait: IO Wait time difference from last and
211 * @sample: Storage for storing last Sample data
212 * @min_perf_ratio: Minimum capacity in terms of PERF or HWP ratios
213 * @max_perf_ratio: Maximum capacity in terms of PERF or HWP ratios
214 * @acpi_perf_data: Stores ACPI perf information read from _PSS
215 * @valid_pss_table: Set to true for valid ACPI _PSS entries found
216 * @epp_powersave: Last saved HWP energy performance preference
217 * (EPP) or energy performance bias (EPB),
218 * when policy switched to performance
219 * @epp_policy: Last saved policy used to set EPP/EPB
220 * @epp_default: Power on default HWP energy performance
222 * @epp_cached Cached HWP energy-performance preference value
223 * @hwp_req_cached: Cached value of the last HWP Request MSR
224 * @hwp_cap_cached: Cached value of the last HWP Capabilities MSR
225 * @last_io_update: Last time when IO wake flag was set
226 * @sched_flags: Store scheduler flags for possible cross CPU update
227 * @hwp_boost_min: Last HWP boosted min performance
228 * @suspended: Whether or not the driver has been suspended.
230 * This structure stores per CPU instance data for all CPUs.
236 struct update_util_data update_util;
237 bool update_util_set;
239 struct pstate_data pstate;
243 u64 last_sample_time;
244 u64 aperf_mperf_shift;
248 u64 prev_cummulative_iowait;
249 struct sample sample;
250 int32_t min_perf_ratio;
251 int32_t max_perf_ratio;
253 struct acpi_processor_performance acpi_perf_data;
254 bool valid_pss_table;
256 unsigned int iowait_boost;
264 unsigned int sched_flags;
269 static struct cpudata **all_cpu_data;
272 * struct pstate_funcs - Per CPU model specific callbacks
273 * @get_max: Callback to get maximum non turbo effective P state
274 * @get_max_physical: Callback to get maximum non turbo physical P state
275 * @get_min: Callback to get minimum P state
276 * @get_turbo: Callback to get turbo P state
277 * @get_scaling: Callback to get frequency scaling factor
278 * @get_aperf_mperf_shift: Callback to get the APERF vs MPERF frequency difference
279 * @get_val: Callback to convert P state to actual MSR write value
280 * @get_vid: Callback to get VID data for Atom platforms
282 * Core and Atom CPU models have different way to get P State limits. This
283 * structure is used to store those callbacks.
285 struct pstate_funcs {
286 int (*get_max)(void);
287 int (*get_max_physical)(void);
288 int (*get_min)(void);
289 int (*get_turbo)(void);
290 int (*get_scaling)(void);
291 int (*get_aperf_mperf_shift)(void);
292 u64 (*get_val)(struct cpudata*, int pstate);
293 void (*get_vid)(struct cpudata *);
296 static struct pstate_funcs pstate_funcs __read_mostly;
298 static int hwp_active __read_mostly;
299 static int hwp_mode_bdw __read_mostly;
300 static bool per_cpu_limits __read_mostly;
301 static bool hwp_boost __read_mostly;
303 static struct cpufreq_driver *intel_pstate_driver __read_mostly;
306 static bool acpi_ppc;
309 static struct global_params global;
311 static DEFINE_MUTEX(intel_pstate_driver_lock);
312 static DEFINE_MUTEX(intel_pstate_limits_lock);
316 static bool intel_pstate_acpi_pm_profile_server(void)
318 if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER ||
319 acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER)
325 static bool intel_pstate_get_ppc_enable_status(void)
327 if (intel_pstate_acpi_pm_profile_server())
333 #ifdef CONFIG_ACPI_CPPC_LIB
335 /* The work item is needed to avoid CPU hotplug locking issues */
336 static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
338 sched_set_itmt_support();
341 static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
343 static void intel_pstate_set_itmt_prio(int cpu)
345 struct cppc_perf_caps cppc_perf;
346 static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
349 ret = cppc_get_perf_caps(cpu, &cppc_perf);
354 * The priorities can be set regardless of whether or not
355 * sched_set_itmt_support(true) has been called and it is valid to
356 * update them at any time after it has been called.
358 sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
360 if (max_highest_perf <= min_highest_perf) {
361 if (cppc_perf.highest_perf > max_highest_perf)
362 max_highest_perf = cppc_perf.highest_perf;
364 if (cppc_perf.highest_perf < min_highest_perf)
365 min_highest_perf = cppc_perf.highest_perf;
367 if (max_highest_perf > min_highest_perf) {
369 * This code can be run during CPU online under the
370 * CPU hotplug locks, so sched_set_itmt_support()
371 * cannot be called from here. Queue up a work item
374 schedule_work(&sched_itmt_work);
379 static int intel_pstate_get_cppc_guranteed(int cpu)
381 struct cppc_perf_caps cppc_perf;
384 ret = cppc_get_perf_caps(cpu, &cppc_perf);
388 if (cppc_perf.guaranteed_perf)
389 return cppc_perf.guaranteed_perf;
391 return cppc_perf.nominal_perf;
394 #else /* CONFIG_ACPI_CPPC_LIB */
395 static void intel_pstate_set_itmt_prio(int cpu)
398 #endif /* CONFIG_ACPI_CPPC_LIB */
400 static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
407 intel_pstate_set_itmt_prio(policy->cpu);
411 if (!intel_pstate_get_ppc_enable_status())
414 cpu = all_cpu_data[policy->cpu];
416 ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
422 * Check if the control value in _PSS is for PERF_CTL MSR, which should
423 * guarantee that the states returned by it map to the states in our
426 if (cpu->acpi_perf_data.control_register.space_id !=
427 ACPI_ADR_SPACE_FIXED_HARDWARE)
431 * If there is only one entry _PSS, simply ignore _PSS and continue as
432 * usual without taking _PSS into account
434 if (cpu->acpi_perf_data.state_count < 2)
437 pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu);
438 for (i = 0; i < cpu->acpi_perf_data.state_count; i++) {
439 pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n",
440 (i == cpu->acpi_perf_data.state ? '*' : ' '), i,
441 (u32) cpu->acpi_perf_data.states[i].core_frequency,
442 (u32) cpu->acpi_perf_data.states[i].power,
443 (u32) cpu->acpi_perf_data.states[i].control);
447 * The _PSS table doesn't contain whole turbo frequency range.
448 * This just contains +1 MHZ above the max non turbo frequency,
449 * with control value corresponding to max turbo ratio. But
450 * when cpufreq set policy is called, it will call with this
451 * max frequency, which will cause a reduced performance as
452 * this driver uses real max turbo frequency as the max
453 * frequency. So correct this frequency in _PSS table to
454 * correct max turbo frequency based on the turbo state.
455 * Also need to convert to MHz as _PSS freq is in MHz.
457 if (!global.turbo_disabled)
458 cpu->acpi_perf_data.states[0].core_frequency =
459 policy->cpuinfo.max_freq / 1000;
460 cpu->valid_pss_table = true;
461 pr_debug("_PPC limits will be enforced\n");
466 cpu->valid_pss_table = false;
467 acpi_processor_unregister_performance(policy->cpu);
470 static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
474 cpu = all_cpu_data[policy->cpu];
475 if (!cpu->valid_pss_table)
478 acpi_processor_unregister_performance(policy->cpu);
480 #else /* CONFIG_ACPI */
481 static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
485 static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
489 static inline bool intel_pstate_acpi_pm_profile_server(void)
493 #endif /* CONFIG_ACPI */
495 #ifndef CONFIG_ACPI_CPPC_LIB
496 static int intel_pstate_get_cppc_guranteed(int cpu)
500 #endif /* CONFIG_ACPI_CPPC_LIB */
502 static inline void update_turbo_state(void)
507 cpu = all_cpu_data[0];
508 rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
509 global.turbo_disabled =
510 (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
511 cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
514 static int min_perf_pct_min(void)
516 struct cpudata *cpu = all_cpu_data[0];
517 int turbo_pstate = cpu->pstate.turbo_pstate;
519 return turbo_pstate ?
520 (cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
523 static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
528 if (!boot_cpu_has(X86_FEATURE_EPB))
531 ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
535 return (s16)(epb & 0x0f);
538 static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
542 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
544 * When hwp_req_data is 0, means that caller didn't read
545 * MSR_HWP_REQUEST, so need to read and get EPP.
548 epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,
553 epp = (hwp_req_data >> 24) & 0xff;
555 /* When there is no EPP present, HWP uses EPB settings */
556 epp = intel_pstate_get_epb(cpu_data);
562 static int intel_pstate_set_epb(int cpu, s16 pref)
567 if (!boot_cpu_has(X86_FEATURE_EPB))
570 ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
574 epb = (epb & ~0x0f) | pref;
575 wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb);
581 * EPP/EPB display strings corresponding to EPP index in the
582 * energy_perf_strings[]
584 *-------------------------------------
587 * 2 balance_performance
591 static const char * const energy_perf_strings[] = {
594 "balance_performance",
599 static const unsigned int epp_values[] = {
601 HWP_EPP_BALANCE_PERFORMANCE,
602 HWP_EPP_BALANCE_POWERSAVE,
606 static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data, int *raw_epp)
612 epp = intel_pstate_get_epp(cpu_data, 0);
616 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
617 if (epp == HWP_EPP_PERFORMANCE)
619 if (epp == HWP_EPP_BALANCE_PERFORMANCE)
621 if (epp == HWP_EPP_BALANCE_POWERSAVE)
623 if (epp == HWP_EPP_POWERSAVE)
627 } else if (boot_cpu_has(X86_FEATURE_EPB)) {
630 * 0x00-0x03 : Performance
631 * 0x04-0x07 : Balance performance
632 * 0x08-0x0B : Balance power
634 * The EPB is a 4 bit value, but our ranges restrict the
635 * value which can be set. Here only using top two bits
638 index = (epp >> 2) + 1;
644 static int intel_pstate_set_epp(struct cpudata *cpu, u32 epp)
649 * Use the cached HWP Request MSR value, because in the active mode the
650 * register itself may be updated by intel_pstate_hwp_boost_up() or
651 * intel_pstate_hwp_boost_down() at any time.
653 u64 value = READ_ONCE(cpu->hwp_req_cached);
655 value &= ~GENMASK_ULL(31, 24);
656 value |= (u64)epp << 24;
658 * The only other updater of hwp_req_cached in the active mode,
659 * intel_pstate_hwp_set(), is called under the same lock as this
660 * function, so it cannot run in parallel with the update below.
662 WRITE_ONCE(cpu->hwp_req_cached, value);
663 ret = wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
665 cpu->epp_cached = epp;
670 static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
671 int pref_index, bool use_raw,
678 epp = cpu_data->epp_default;
680 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
683 else if (epp == -EINVAL)
684 epp = epp_values[pref_index - 1];
687 * To avoid confusion, refuse to set EPP to any values different
688 * from 0 (performance) if the current policy is "performance",
689 * because those values would be overridden.
691 if (epp > 0 && cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
694 ret = intel_pstate_set_epp(cpu_data, epp);
697 epp = (pref_index - 1) << 2;
698 ret = intel_pstate_set_epb(cpu_data->cpu, epp);
704 static ssize_t show_energy_performance_available_preferences(
705 struct cpufreq_policy *policy, char *buf)
710 while (energy_perf_strings[i] != NULL)
711 ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
713 ret += sprintf(&buf[ret], "\n");
718 cpufreq_freq_attr_ro(energy_performance_available_preferences);
720 static struct cpufreq_driver intel_pstate;
722 static ssize_t store_energy_performance_preference(
723 struct cpufreq_policy *policy, const char *buf, size_t count)
725 struct cpudata *cpu = all_cpu_data[policy->cpu];
726 char str_preference[21];
731 ret = sscanf(buf, "%20s", str_preference);
735 ret = match_string(energy_perf_strings, -1, str_preference);
737 if (!boot_cpu_has(X86_FEATURE_HWP_EPP))
740 ret = kstrtouint(buf, 10, &epp);
751 * This function runs with the policy R/W semaphore held, which
752 * guarantees that the driver pointer will not change while it is
755 if (!intel_pstate_driver)
758 mutex_lock(&intel_pstate_limits_lock);
760 if (intel_pstate_driver == &intel_pstate) {
761 ret = intel_pstate_set_energy_pref_index(cpu, ret, raw, epp);
764 * In the passive mode the governor needs to be stopped on the
765 * target CPU before the EPP update and restarted after it,
766 * which is super-heavy-weight, so make sure it is worth doing
770 epp = ret ? epp_values[ret - 1] : cpu->epp_default;
772 if (cpu->epp_cached != epp) {
775 cpufreq_stop_governor(policy);
776 ret = intel_pstate_set_epp(cpu, epp);
777 err = cpufreq_start_governor(policy);
783 mutex_unlock(&intel_pstate_limits_lock);
788 static ssize_t show_energy_performance_preference(
789 struct cpufreq_policy *policy, char *buf)
791 struct cpudata *cpu_data = all_cpu_data[policy->cpu];
792 int preference, raw_epp;
794 preference = intel_pstate_get_energy_pref_index(cpu_data, &raw_epp);
799 return sprintf(buf, "%d\n", raw_epp);
801 return sprintf(buf, "%s\n", energy_perf_strings[preference]);
804 cpufreq_freq_attr_rw(energy_performance_preference);
806 static ssize_t show_base_frequency(struct cpufreq_policy *policy, char *buf)
812 ratio = intel_pstate_get_cppc_guranteed(policy->cpu);
814 rdmsrl_on_cpu(policy->cpu, MSR_HWP_CAPABILITIES, &cap);
815 ratio = HWP_GUARANTEED_PERF(cap);
818 cpu = all_cpu_data[policy->cpu];
820 return sprintf(buf, "%d\n", ratio * cpu->pstate.scaling);
823 cpufreq_freq_attr_ro(base_frequency);
825 static struct freq_attr *hwp_cpufreq_attrs[] = {
826 &energy_performance_preference,
827 &energy_performance_available_preferences,
832 static void intel_pstate_get_hwp_max(struct cpudata *cpu, int *phy_max,
837 rdmsrl_on_cpu(cpu->cpu, MSR_HWP_CAPABILITIES, &cap);
838 WRITE_ONCE(cpu->hwp_cap_cached, cap);
839 if (global.no_turbo || global.turbo_disabled)
840 *current_max = HWP_GUARANTEED_PERF(cap);
842 *current_max = HWP_HIGHEST_PERF(cap);
844 *phy_max = HWP_HIGHEST_PERF(cap);
847 static void intel_pstate_hwp_set(unsigned int cpu)
849 struct cpudata *cpu_data = all_cpu_data[cpu];
854 max = cpu_data->max_perf_ratio;
855 min = cpu_data->min_perf_ratio;
857 if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
860 rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
862 value &= ~HWP_MIN_PERF(~0L);
863 value |= HWP_MIN_PERF(min);
865 value &= ~HWP_MAX_PERF(~0L);
866 value |= HWP_MAX_PERF(max);
868 if (cpu_data->epp_policy == cpu_data->policy)
871 cpu_data->epp_policy = cpu_data->policy;
873 if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) {
874 epp = intel_pstate_get_epp(cpu_data, value);
875 cpu_data->epp_powersave = epp;
876 /* If EPP read was failed, then don't try to write */
882 /* skip setting EPP, when saved value is invalid */
883 if (cpu_data->epp_powersave < 0)
887 * No need to restore EPP when it is not zero. This
889 * - Policy is not changed
890 * - user has manually changed
891 * - Error reading EPB
893 epp = intel_pstate_get_epp(cpu_data, value);
897 epp = cpu_data->epp_powersave;
899 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
900 value &= ~GENMASK_ULL(31, 24);
901 value |= (u64)epp << 24;
903 intel_pstate_set_epb(cpu, epp);
906 WRITE_ONCE(cpu_data->hwp_req_cached, value);
907 wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
910 static void intel_pstate_hwp_offline(struct cpudata *cpu)
912 u64 value = READ_ONCE(cpu->hwp_req_cached);
915 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
917 * In case the EPP has been set to "performance" by the
918 * active mode "performance" scaling algorithm, replace that
919 * temporary value with the cached EPP one.
921 value &= ~GENMASK_ULL(31, 24);
922 value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
923 WRITE_ONCE(cpu->hwp_req_cached, value);
926 value &= ~GENMASK_ULL(31, 0);
927 min_perf = HWP_LOWEST_PERF(cpu->hwp_cap_cached);
929 /* Set hwp_max = hwp_min */
930 value |= HWP_MAX_PERF(min_perf);
931 value |= HWP_MIN_PERF(min_perf);
934 if (boot_cpu_has(X86_FEATURE_HWP_EPP))
935 value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
937 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
940 #define POWER_CTL_EE_ENABLE 1
941 #define POWER_CTL_EE_DISABLE 2
943 static int power_ctl_ee_state;
945 static void set_power_ctl_ee_state(bool input)
949 mutex_lock(&intel_pstate_driver_lock);
950 rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
952 power_ctl &= ~BIT(MSR_IA32_POWER_CTL_BIT_EE);
953 power_ctl_ee_state = POWER_CTL_EE_ENABLE;
955 power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
956 power_ctl_ee_state = POWER_CTL_EE_DISABLE;
958 wrmsrl(MSR_IA32_POWER_CTL, power_ctl);
959 mutex_unlock(&intel_pstate_driver_lock);
962 static void intel_pstate_hwp_enable(struct cpudata *cpudata);
964 static void intel_pstate_hwp_reenable(struct cpudata *cpu)
966 intel_pstate_hwp_enable(cpu);
967 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, READ_ONCE(cpu->hwp_req_cached));
970 static int intel_pstate_suspend(struct cpufreq_policy *policy)
972 struct cpudata *cpu = all_cpu_data[policy->cpu];
974 pr_debug("CPU %d suspending\n", cpu->cpu);
976 cpu->suspended = true;
981 static int intel_pstate_resume(struct cpufreq_policy *policy)
983 struct cpudata *cpu = all_cpu_data[policy->cpu];
985 pr_debug("CPU %d resuming\n", cpu->cpu);
987 /* Only restore if the system default is changed */
988 if (power_ctl_ee_state == POWER_CTL_EE_ENABLE)
989 set_power_ctl_ee_state(true);
990 else if (power_ctl_ee_state == POWER_CTL_EE_DISABLE)
991 set_power_ctl_ee_state(false);
993 if (cpu->suspended && hwp_active) {
994 mutex_lock(&intel_pstate_limits_lock);
996 /* Re-enable HWP, because "online" has not done that. */
997 intel_pstate_hwp_reenable(cpu);
999 mutex_unlock(&intel_pstate_limits_lock);
1002 cpu->suspended = false;
1007 static void intel_pstate_update_policies(void)
1011 for_each_possible_cpu(cpu)
1012 cpufreq_update_policy(cpu);
1015 static void intel_pstate_update_max_freq(unsigned int cpu)
1017 struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
1018 struct cpudata *cpudata;
1023 cpudata = all_cpu_data[cpu];
1024 policy->cpuinfo.max_freq = global.turbo_disabled_mf ?
1025 cpudata->pstate.max_freq : cpudata->pstate.turbo_freq;
1027 refresh_frequency_limits(policy);
1029 cpufreq_cpu_release(policy);
1032 static void intel_pstate_update_limits(unsigned int cpu)
1034 mutex_lock(&intel_pstate_driver_lock);
1036 update_turbo_state();
1038 * If turbo has been turned on or off globally, policy limits for
1039 * all CPUs need to be updated to reflect that.
1041 if (global.turbo_disabled_mf != global.turbo_disabled) {
1042 global.turbo_disabled_mf = global.turbo_disabled;
1043 arch_set_max_freq_ratio(global.turbo_disabled);
1044 for_each_possible_cpu(cpu)
1045 intel_pstate_update_max_freq(cpu);
1047 cpufreq_update_policy(cpu);
1050 mutex_unlock(&intel_pstate_driver_lock);
1053 /************************** sysfs begin ************************/
1054 #define show_one(file_name, object) \
1055 static ssize_t show_##file_name \
1056 (struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
1058 return sprintf(buf, "%u\n", global.object); \
1061 static ssize_t intel_pstate_show_status(char *buf);
1062 static int intel_pstate_update_status(const char *buf, size_t size);
1064 static ssize_t show_status(struct kobject *kobj,
1065 struct kobj_attribute *attr, char *buf)
1069 mutex_lock(&intel_pstate_driver_lock);
1070 ret = intel_pstate_show_status(buf);
1071 mutex_unlock(&intel_pstate_driver_lock);
1076 static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
1077 const char *buf, size_t count)
1079 char *p = memchr(buf, '\n', count);
1082 mutex_lock(&intel_pstate_driver_lock);
1083 ret = intel_pstate_update_status(buf, p ? p - buf : count);
1084 mutex_unlock(&intel_pstate_driver_lock);
1086 return ret < 0 ? ret : count;
1089 static ssize_t show_turbo_pct(struct kobject *kobj,
1090 struct kobj_attribute *attr, char *buf)
1092 struct cpudata *cpu;
1093 int total, no_turbo, turbo_pct;
1096 mutex_lock(&intel_pstate_driver_lock);
1098 if (!intel_pstate_driver) {
1099 mutex_unlock(&intel_pstate_driver_lock);
1103 cpu = all_cpu_data[0];
1105 total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1106 no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
1107 turbo_fp = div_fp(no_turbo, total);
1108 turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
1110 mutex_unlock(&intel_pstate_driver_lock);
1112 return sprintf(buf, "%u\n", turbo_pct);
1115 static ssize_t show_num_pstates(struct kobject *kobj,
1116 struct kobj_attribute *attr, char *buf)
1118 struct cpudata *cpu;
1121 mutex_lock(&intel_pstate_driver_lock);
1123 if (!intel_pstate_driver) {
1124 mutex_unlock(&intel_pstate_driver_lock);
1128 cpu = all_cpu_data[0];
1129 total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1131 mutex_unlock(&intel_pstate_driver_lock);
1133 return sprintf(buf, "%u\n", total);
1136 static ssize_t show_no_turbo(struct kobject *kobj,
1137 struct kobj_attribute *attr, char *buf)
1141 mutex_lock(&intel_pstate_driver_lock);
1143 if (!intel_pstate_driver) {
1144 mutex_unlock(&intel_pstate_driver_lock);
1148 update_turbo_state();
1149 if (global.turbo_disabled)
1150 ret = sprintf(buf, "%u\n", global.turbo_disabled);
1152 ret = sprintf(buf, "%u\n", global.no_turbo);
1154 mutex_unlock(&intel_pstate_driver_lock);
1159 static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
1160 const char *buf, size_t count)
1165 ret = sscanf(buf, "%u", &input);
1169 mutex_lock(&intel_pstate_driver_lock);
1171 if (!intel_pstate_driver) {
1172 mutex_unlock(&intel_pstate_driver_lock);
1176 mutex_lock(&intel_pstate_limits_lock);
1178 update_turbo_state();
1179 if (global.turbo_disabled) {
1180 pr_notice_once("Turbo disabled by BIOS or unavailable on processor\n");
1181 mutex_unlock(&intel_pstate_limits_lock);
1182 mutex_unlock(&intel_pstate_driver_lock);
1186 global.no_turbo = clamp_t(int, input, 0, 1);
1188 if (global.no_turbo) {
1189 struct cpudata *cpu = all_cpu_data[0];
1190 int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate;
1192 /* Squash the global minimum into the permitted range. */
1193 if (global.min_perf_pct > pct)
1194 global.min_perf_pct = pct;
1197 mutex_unlock(&intel_pstate_limits_lock);
1199 intel_pstate_update_policies();
1201 mutex_unlock(&intel_pstate_driver_lock);
1206 static void update_qos_request(enum freq_qos_req_type type)
1208 int max_state, turbo_max, freq, i, perf_pct;
1209 struct freq_qos_request *req;
1210 struct cpufreq_policy *policy;
1212 for_each_possible_cpu(i) {
1213 struct cpudata *cpu = all_cpu_data[i];
1215 policy = cpufreq_cpu_get(i);
1219 req = policy->driver_data;
1220 cpufreq_cpu_put(policy);
1226 intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
1228 turbo_max = cpu->pstate.turbo_pstate;
1230 if (type == FREQ_QOS_MIN) {
1231 perf_pct = global.min_perf_pct;
1234 perf_pct = global.max_perf_pct;
1237 freq = DIV_ROUND_UP(turbo_max * perf_pct, 100);
1238 freq *= cpu->pstate.scaling;
1240 if (freq_qos_update_request(req, freq) < 0)
1241 pr_warn("Failed to update freq constraint: CPU%d\n", i);
1245 static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
1246 const char *buf, size_t count)
1251 ret = sscanf(buf, "%u", &input);
1255 mutex_lock(&intel_pstate_driver_lock);
1257 if (!intel_pstate_driver) {
1258 mutex_unlock(&intel_pstate_driver_lock);
1262 mutex_lock(&intel_pstate_limits_lock);
1264 global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100);
1266 mutex_unlock(&intel_pstate_limits_lock);
1268 if (intel_pstate_driver == &intel_pstate)
1269 intel_pstate_update_policies();
1271 update_qos_request(FREQ_QOS_MAX);
1273 mutex_unlock(&intel_pstate_driver_lock);
1278 static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b,
1279 const char *buf, size_t count)
1284 ret = sscanf(buf, "%u", &input);
1288 mutex_lock(&intel_pstate_driver_lock);
1290 if (!intel_pstate_driver) {
1291 mutex_unlock(&intel_pstate_driver_lock);
1295 mutex_lock(&intel_pstate_limits_lock);
1297 global.min_perf_pct = clamp_t(int, input,
1298 min_perf_pct_min(), global.max_perf_pct);
1300 mutex_unlock(&intel_pstate_limits_lock);
1302 if (intel_pstate_driver == &intel_pstate)
1303 intel_pstate_update_policies();
1305 update_qos_request(FREQ_QOS_MIN);
1307 mutex_unlock(&intel_pstate_driver_lock);
1312 static ssize_t show_hwp_dynamic_boost(struct kobject *kobj,
1313 struct kobj_attribute *attr, char *buf)
1315 return sprintf(buf, "%u\n", hwp_boost);
1318 static ssize_t store_hwp_dynamic_boost(struct kobject *a,
1319 struct kobj_attribute *b,
1320 const char *buf, size_t count)
1325 ret = kstrtouint(buf, 10, &input);
1329 mutex_lock(&intel_pstate_driver_lock);
1330 hwp_boost = !!input;
1331 intel_pstate_update_policies();
1332 mutex_unlock(&intel_pstate_driver_lock);
1337 static ssize_t show_energy_efficiency(struct kobject *kobj, struct kobj_attribute *attr,
1343 rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
1344 enable = !!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE));
1345 return sprintf(buf, "%d\n", !enable);
1348 static ssize_t store_energy_efficiency(struct kobject *a, struct kobj_attribute *b,
1349 const char *buf, size_t count)
1354 ret = kstrtobool(buf, &input);
1358 set_power_ctl_ee_state(input);
1363 show_one(max_perf_pct, max_perf_pct);
1364 show_one(min_perf_pct, min_perf_pct);
1366 define_one_global_rw(status);
1367 define_one_global_rw(no_turbo);
1368 define_one_global_rw(max_perf_pct);
1369 define_one_global_rw(min_perf_pct);
1370 define_one_global_ro(turbo_pct);
1371 define_one_global_ro(num_pstates);
1372 define_one_global_rw(hwp_dynamic_boost);
1373 define_one_global_rw(energy_efficiency);
1375 static struct attribute *intel_pstate_attributes[] = {
1383 static const struct attribute_group intel_pstate_attr_group = {
1384 .attrs = intel_pstate_attributes,
1387 static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[];
1389 static struct kobject *intel_pstate_kobject;
1391 static void __init intel_pstate_sysfs_expose_params(void)
1395 intel_pstate_kobject = kobject_create_and_add("intel_pstate",
1396 &cpu_subsys.dev_root->kobj);
1397 if (WARN_ON(!intel_pstate_kobject))
1400 rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
1405 * If per cpu limits are enforced there are no global limits, so
1406 * return without creating max/min_perf_pct attributes
1411 rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr);
1414 rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
1417 if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids)) {
1418 rc = sysfs_create_file(intel_pstate_kobject, &energy_efficiency.attr);
1423 static void __init intel_pstate_sysfs_remove(void)
1425 if (!intel_pstate_kobject)
1428 sysfs_remove_group(intel_pstate_kobject, &intel_pstate_attr_group);
1430 if (!per_cpu_limits) {
1431 sysfs_remove_file(intel_pstate_kobject, &max_perf_pct.attr);
1432 sysfs_remove_file(intel_pstate_kobject, &min_perf_pct.attr);
1434 if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids))
1435 sysfs_remove_file(intel_pstate_kobject, &energy_efficiency.attr);
1438 kobject_put(intel_pstate_kobject);
1441 static void intel_pstate_sysfs_expose_hwp_dynamic_boost(void)
1448 rc = sysfs_create_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1452 static void intel_pstate_sysfs_hide_hwp_dynamic_boost(void)
1457 sysfs_remove_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1460 /************************** sysfs end ************************/
1462 static void intel_pstate_hwp_enable(struct cpudata *cpudata)
1464 /* First disable HWP notification interrupt as we don't process them */
1465 if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1466 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1468 wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
1469 if (cpudata->epp_default == -EINVAL)
1470 cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
1473 static int atom_get_min_pstate(void)
1477 rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1478 return (value >> 8) & 0x7F;
1481 static int atom_get_max_pstate(void)
1485 rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1486 return (value >> 16) & 0x7F;
1489 static int atom_get_turbo_pstate(void)
1493 rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value);
1494 return value & 0x7F;
1497 static u64 atom_get_val(struct cpudata *cpudata, int pstate)
1503 val = (u64)pstate << 8;
1504 if (global.no_turbo && !global.turbo_disabled)
1505 val |= (u64)1 << 32;
1507 vid_fp = cpudata->vid.min + mul_fp(
1508 int_tofp(pstate - cpudata->pstate.min_pstate),
1509 cpudata->vid.ratio);
1511 vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
1512 vid = ceiling_fp(vid_fp);
1514 if (pstate > cpudata->pstate.max_pstate)
1515 vid = cpudata->vid.turbo;
1520 static int silvermont_get_scaling(void)
1524 /* Defined in Table 35-6 from SDM (Sept 2015) */
1525 static int silvermont_freq_table[] = {
1526 83300, 100000, 133300, 116700, 80000};
1528 rdmsrl(MSR_FSB_FREQ, value);
1532 return silvermont_freq_table[i];
1535 static int airmont_get_scaling(void)
1539 /* Defined in Table 35-10 from SDM (Sept 2015) */
1540 static int airmont_freq_table[] = {
1541 83300, 100000, 133300, 116700, 80000,
1542 93300, 90000, 88900, 87500};
1544 rdmsrl(MSR_FSB_FREQ, value);
1548 return airmont_freq_table[i];
1551 static void atom_get_vid(struct cpudata *cpudata)
1555 rdmsrl(MSR_ATOM_CORE_VIDS, value);
1556 cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
1557 cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
1558 cpudata->vid.ratio = div_fp(
1559 cpudata->vid.max - cpudata->vid.min,
1560 int_tofp(cpudata->pstate.max_pstate -
1561 cpudata->pstate.min_pstate));
1563 rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value);
1564 cpudata->vid.turbo = value & 0x7f;
1567 static int core_get_min_pstate(void)
1571 rdmsrl(MSR_PLATFORM_INFO, value);
1572 return (value >> 40) & 0xFF;
1575 static int core_get_max_pstate_physical(void)
1579 rdmsrl(MSR_PLATFORM_INFO, value);
1580 return (value >> 8) & 0xFF;
1583 static int core_get_tdp_ratio(u64 plat_info)
1585 /* Check how many TDP levels present */
1586 if (plat_info & 0x600000000) {
1592 /* Get the TDP level (0, 1, 2) to get ratios */
1593 err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
1597 /* TDP MSR are continuous starting at 0x648 */
1598 tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
1599 err = rdmsrl_safe(tdp_msr, &tdp_ratio);
1603 /* For level 1 and 2, bits[23:16] contain the ratio */
1604 if (tdp_ctrl & 0x03)
1607 tdp_ratio &= 0xff; /* ratios are only 8 bits long */
1608 pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
1610 return (int)tdp_ratio;
1616 static int core_get_max_pstate(void)
1624 rdmsrl(MSR_PLATFORM_INFO, plat_info);
1625 max_pstate = (plat_info >> 8) & 0xFF;
1627 tdp_ratio = core_get_tdp_ratio(plat_info);
1632 /* Turbo activation ratio is not used on HWP platforms */
1636 err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
1640 /* Do some sanity checking for safety */
1641 tar_levels = tar & 0xff;
1642 if (tdp_ratio - 1 == tar_levels) {
1643 max_pstate = tar_levels;
1644 pr_debug("max_pstate=TAC %x\n", max_pstate);
1651 static int core_get_turbo_pstate(void)
1656 rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1657 nont = core_get_max_pstate();
1658 ret = (value) & 255;
1664 static inline int core_get_scaling(void)
1669 static u64 core_get_val(struct cpudata *cpudata, int pstate)
1673 val = (u64)pstate << 8;
1674 if (global.no_turbo && !global.turbo_disabled)
1675 val |= (u64)1 << 32;
1680 static int knl_get_aperf_mperf_shift(void)
1685 static int knl_get_turbo_pstate(void)
1690 rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1691 nont = core_get_max_pstate();
1692 ret = (((value) >> 8) & 0xFF);
1698 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
1700 trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
1701 cpu->pstate.current_pstate = pstate;
1703 * Generally, there is no guarantee that this code will always run on
1704 * the CPU being updated, so force the register update to run on the
1707 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
1708 pstate_funcs.get_val(cpu, pstate));
1711 static void intel_pstate_set_min_pstate(struct cpudata *cpu)
1713 intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
1716 static void intel_pstate_max_within_limits(struct cpudata *cpu)
1718 int pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio);
1720 update_turbo_state();
1721 intel_pstate_set_pstate(cpu, pstate);
1724 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
1726 cpu->pstate.min_pstate = pstate_funcs.get_min();
1727 cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical();
1728 cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
1729 cpu->pstate.scaling = pstate_funcs.get_scaling();
1731 if (hwp_active && !hwp_mode_bdw) {
1732 unsigned int phy_max, current_max;
1734 intel_pstate_get_hwp_max(cpu, &phy_max, ¤t_max);
1735 cpu->pstate.turbo_freq = phy_max * cpu->pstate.scaling;
1736 cpu->pstate.turbo_pstate = phy_max;
1737 cpu->pstate.max_pstate = HWP_GUARANTEED_PERF(READ_ONCE(cpu->hwp_cap_cached));
1739 cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
1740 cpu->pstate.max_pstate = pstate_funcs.get_max();
1742 cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
1744 if (pstate_funcs.get_aperf_mperf_shift)
1745 cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();
1747 if (pstate_funcs.get_vid)
1748 pstate_funcs.get_vid(cpu);
1750 intel_pstate_set_min_pstate(cpu);
1754 * Long hold time will keep high perf limits for long time,
1755 * which negatively impacts perf/watt for some workloads,
1756 * like specpower. 3ms is based on experiements on some
1759 static int hwp_boost_hold_time_ns = 3 * NSEC_PER_MSEC;
1761 static inline void intel_pstate_hwp_boost_up(struct cpudata *cpu)
1763 u64 hwp_req = READ_ONCE(cpu->hwp_req_cached);
1764 u32 max_limit = (hwp_req & 0xff00) >> 8;
1765 u32 min_limit = (hwp_req & 0xff);
1769 * Cases to consider (User changes via sysfs or boot time):
1770 * If, P0 (Turbo max) = P1 (Guaranteed max) = min:
1772 * If, P0 (Turbo max) > P1 (Guaranteed max) = min:
1773 * Should result in one level boost only for P0.
1774 * If, P0 (Turbo max) = P1 (Guaranteed max) > min:
1775 * Should result in two level boost:
1776 * (min + p1)/2 and P1.
1777 * If, P0 (Turbo max) > P1 (Guaranteed max) > min:
1778 * Should result in three level boost:
1779 * (min + p1)/2, P1 and P0.
1782 /* If max and min are equal or already at max, nothing to boost */
1783 if (max_limit == min_limit || cpu->hwp_boost_min >= max_limit)
1786 if (!cpu->hwp_boost_min)
1787 cpu->hwp_boost_min = min_limit;
1789 /* level at half way mark between min and guranteed */
1790 boost_level1 = (HWP_GUARANTEED_PERF(cpu->hwp_cap_cached) + min_limit) >> 1;
1792 if (cpu->hwp_boost_min < boost_level1)
1793 cpu->hwp_boost_min = boost_level1;
1794 else if (cpu->hwp_boost_min < HWP_GUARANTEED_PERF(cpu->hwp_cap_cached))
1795 cpu->hwp_boost_min = HWP_GUARANTEED_PERF(cpu->hwp_cap_cached);
1796 else if (cpu->hwp_boost_min == HWP_GUARANTEED_PERF(cpu->hwp_cap_cached) &&
1797 max_limit != HWP_GUARANTEED_PERF(cpu->hwp_cap_cached))
1798 cpu->hwp_boost_min = max_limit;
1802 hwp_req = (hwp_req & ~GENMASK_ULL(7, 0)) | cpu->hwp_boost_min;
1803 wrmsrl(MSR_HWP_REQUEST, hwp_req);
1804 cpu->last_update = cpu->sample.time;
1807 static inline void intel_pstate_hwp_boost_down(struct cpudata *cpu)
1809 if (cpu->hwp_boost_min) {
1812 /* Check if we are idle for hold time to boost down */
1813 expired = time_after64(cpu->sample.time, cpu->last_update +
1814 hwp_boost_hold_time_ns);
1816 wrmsrl(MSR_HWP_REQUEST, cpu->hwp_req_cached);
1817 cpu->hwp_boost_min = 0;
1820 cpu->last_update = cpu->sample.time;
1823 static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu,
1826 cpu->sample.time = time;
1828 if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) {
1831 cpu->sched_flags = 0;
1833 * Set iowait_boost flag and update time. Since IO WAIT flag
1834 * is set all the time, we can't just conclude that there is
1835 * some IO bound activity is scheduled on this CPU with just
1836 * one occurrence. If we receive at least two in two
1837 * consecutive ticks, then we treat as boost candidate.
1839 if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC))
1842 cpu->last_io_update = time;
1845 intel_pstate_hwp_boost_up(cpu);
1848 intel_pstate_hwp_boost_down(cpu);
1852 static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
1853 u64 time, unsigned int flags)
1855 struct cpudata *cpu = container_of(data, struct cpudata, update_util);
1857 cpu->sched_flags |= flags;
1859 if (smp_processor_id() == cpu->cpu)
1860 intel_pstate_update_util_hwp_local(cpu, time);
1863 static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
1865 struct sample *sample = &cpu->sample;
1867 sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf);
1870 static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
1873 unsigned long flags;
1876 local_irq_save(flags);
1877 rdmsrl(MSR_IA32_APERF, aperf);
1878 rdmsrl(MSR_IA32_MPERF, mperf);
1880 if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) {
1881 local_irq_restore(flags);
1884 local_irq_restore(flags);
1886 cpu->last_sample_time = cpu->sample.time;
1887 cpu->sample.time = time;
1888 cpu->sample.aperf = aperf;
1889 cpu->sample.mperf = mperf;
1890 cpu->sample.tsc = tsc;
1891 cpu->sample.aperf -= cpu->prev_aperf;
1892 cpu->sample.mperf -= cpu->prev_mperf;
1893 cpu->sample.tsc -= cpu->prev_tsc;
1895 cpu->prev_aperf = aperf;
1896 cpu->prev_mperf = mperf;
1897 cpu->prev_tsc = tsc;
1899 * First time this function is invoked in a given cycle, all of the
1900 * previous sample data fields are equal to zero or stale and they must
1901 * be populated with meaningful numbers for things to work, so assume
1902 * that sample.time will always be reset before setting the utilization
1903 * update hook and make the caller skip the sample then.
1905 if (cpu->last_sample_time) {
1906 intel_pstate_calc_avg_perf(cpu);
1912 static inline int32_t get_avg_frequency(struct cpudata *cpu)
1914 return mul_ext_fp(cpu->sample.core_avg_perf, cpu_khz);
1917 static inline int32_t get_avg_pstate(struct cpudata *cpu)
1919 return mul_ext_fp(cpu->pstate.max_pstate_physical,
1920 cpu->sample.core_avg_perf);
1923 static inline int32_t get_target_pstate(struct cpudata *cpu)
1925 struct sample *sample = &cpu->sample;
1927 int target, avg_pstate;
1929 busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
1932 if (busy_frac < cpu->iowait_boost)
1933 busy_frac = cpu->iowait_boost;
1935 sample->busy_scaled = busy_frac * 100;
1937 target = global.no_turbo || global.turbo_disabled ?
1938 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
1939 target += target >> 2;
1940 target = mul_fp(target, busy_frac);
1941 if (target < cpu->pstate.min_pstate)
1942 target = cpu->pstate.min_pstate;
1945 * If the average P-state during the previous cycle was higher than the
1946 * current target, add 50% of the difference to the target to reduce
1947 * possible performance oscillations and offset possible performance
1948 * loss related to moving the workload from one CPU to another within
1951 avg_pstate = get_avg_pstate(cpu);
1952 if (avg_pstate > target)
1953 target += (avg_pstate - target) >> 1;
1958 static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
1960 int min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio);
1961 int max_pstate = max(min_pstate, cpu->max_perf_ratio);
1963 return clamp_t(int, pstate, min_pstate, max_pstate);
1966 static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
1968 if (pstate == cpu->pstate.current_pstate)
1971 cpu->pstate.current_pstate = pstate;
1972 wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate));
1975 static void intel_pstate_adjust_pstate(struct cpudata *cpu)
1977 int from = cpu->pstate.current_pstate;
1978 struct sample *sample;
1981 update_turbo_state();
1983 target_pstate = get_target_pstate(cpu);
1984 target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
1985 trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
1986 intel_pstate_update_pstate(cpu, target_pstate);
1988 sample = &cpu->sample;
1989 trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf),
1990 fp_toint(sample->busy_scaled),
1992 cpu->pstate.current_pstate,
1996 get_avg_frequency(cpu),
1997 fp_toint(cpu->iowait_boost * 100));
2000 static void intel_pstate_update_util(struct update_util_data *data, u64 time,
2003 struct cpudata *cpu = container_of(data, struct cpudata, update_util);
2006 /* Don't allow remote callbacks */
2007 if (smp_processor_id() != cpu->cpu)
2010 delta_ns = time - cpu->last_update;
2011 if (flags & SCHED_CPUFREQ_IOWAIT) {
2012 /* Start over if the CPU may have been idle. */
2013 if (delta_ns > TICK_NSEC) {
2014 cpu->iowait_boost = ONE_EIGHTH_FP;
2015 } else if (cpu->iowait_boost >= ONE_EIGHTH_FP) {
2016 cpu->iowait_boost <<= 1;
2017 if (cpu->iowait_boost > int_tofp(1))
2018 cpu->iowait_boost = int_tofp(1);
2020 cpu->iowait_boost = ONE_EIGHTH_FP;
2022 } else if (cpu->iowait_boost) {
2023 /* Clear iowait_boost if the CPU may have been idle. */
2024 if (delta_ns > TICK_NSEC)
2025 cpu->iowait_boost = 0;
2027 cpu->iowait_boost >>= 1;
2029 cpu->last_update = time;
2030 delta_ns = time - cpu->sample.time;
2031 if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL)
2034 if (intel_pstate_sample(cpu, time))
2035 intel_pstate_adjust_pstate(cpu);
2038 static struct pstate_funcs core_funcs = {
2039 .get_max = core_get_max_pstate,
2040 .get_max_physical = core_get_max_pstate_physical,
2041 .get_min = core_get_min_pstate,
2042 .get_turbo = core_get_turbo_pstate,
2043 .get_scaling = core_get_scaling,
2044 .get_val = core_get_val,
2047 static const struct pstate_funcs silvermont_funcs = {
2048 .get_max = atom_get_max_pstate,
2049 .get_max_physical = atom_get_max_pstate,
2050 .get_min = atom_get_min_pstate,
2051 .get_turbo = atom_get_turbo_pstate,
2052 .get_val = atom_get_val,
2053 .get_scaling = silvermont_get_scaling,
2054 .get_vid = atom_get_vid,
2057 static const struct pstate_funcs airmont_funcs = {
2058 .get_max = atom_get_max_pstate,
2059 .get_max_physical = atom_get_max_pstate,
2060 .get_min = atom_get_min_pstate,
2061 .get_turbo = atom_get_turbo_pstate,
2062 .get_val = atom_get_val,
2063 .get_scaling = airmont_get_scaling,
2064 .get_vid = atom_get_vid,
2067 static const struct pstate_funcs knl_funcs = {
2068 .get_max = core_get_max_pstate,
2069 .get_max_physical = core_get_max_pstate_physical,
2070 .get_min = core_get_min_pstate,
2071 .get_turbo = knl_get_turbo_pstate,
2072 .get_aperf_mperf_shift = knl_get_aperf_mperf_shift,
2073 .get_scaling = core_get_scaling,
2074 .get_val = core_get_val,
2077 #define X86_MATCH(model, policy) \
2078 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
2079 X86_FEATURE_APERFMPERF, &policy)
2081 static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
2082 X86_MATCH(SANDYBRIDGE, core_funcs),
2083 X86_MATCH(SANDYBRIDGE_X, core_funcs),
2084 X86_MATCH(ATOM_SILVERMONT, silvermont_funcs),
2085 X86_MATCH(IVYBRIDGE, core_funcs),
2086 X86_MATCH(HASWELL, core_funcs),
2087 X86_MATCH(BROADWELL, core_funcs),
2088 X86_MATCH(IVYBRIDGE_X, core_funcs),
2089 X86_MATCH(HASWELL_X, core_funcs),
2090 X86_MATCH(HASWELL_L, core_funcs),
2091 X86_MATCH(HASWELL_G, core_funcs),
2092 X86_MATCH(BROADWELL_G, core_funcs),
2093 X86_MATCH(ATOM_AIRMONT, airmont_funcs),
2094 X86_MATCH(SKYLAKE_L, core_funcs),
2095 X86_MATCH(BROADWELL_X, core_funcs),
2096 X86_MATCH(SKYLAKE, core_funcs),
2097 X86_MATCH(BROADWELL_D, core_funcs),
2098 X86_MATCH(XEON_PHI_KNL, knl_funcs),
2099 X86_MATCH(XEON_PHI_KNM, knl_funcs),
2100 X86_MATCH(ATOM_GOLDMONT, core_funcs),
2101 X86_MATCH(ATOM_GOLDMONT_PLUS, core_funcs),
2102 X86_MATCH(SKYLAKE_X, core_funcs),
2105 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
2107 static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
2108 X86_MATCH(BROADWELL_D, core_funcs),
2109 X86_MATCH(BROADWELL_X, core_funcs),
2110 X86_MATCH(SKYLAKE_X, core_funcs),
2114 static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
2115 X86_MATCH(KABYLAKE, core_funcs),
2119 static const struct x86_cpu_id intel_pstate_hwp_boost_ids[] = {
2120 X86_MATCH(SKYLAKE_X, core_funcs),
2121 X86_MATCH(SKYLAKE, core_funcs),
2125 static int intel_pstate_init_cpu(unsigned int cpunum)
2127 struct cpudata *cpu;
2129 cpu = all_cpu_data[cpunum];
2132 cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
2136 all_cpu_data[cpunum] = cpu;
2140 cpu->epp_default = -EINVAL;
2143 const struct x86_cpu_id *id;
2145 intel_pstate_hwp_enable(cpu);
2147 id = x86_match_cpu(intel_pstate_hwp_boost_ids);
2148 if (id && intel_pstate_acpi_pm_profile_server())
2151 } else if (hwp_active) {
2153 * Re-enable HWP in case this happens after a resume from ACPI
2154 * S3 if the CPU was offline during the whole system/resume
2157 intel_pstate_hwp_reenable(cpu);
2160 cpu->epp_powersave = -EINVAL;
2161 cpu->epp_policy = 0;
2163 intel_pstate_get_cpu_pstates(cpu);
2165 pr_debug("controlling: cpu %d\n", cpunum);
2170 static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
2172 struct cpudata *cpu = all_cpu_data[cpu_num];
2174 if (hwp_active && !hwp_boost)
2177 if (cpu->update_util_set)
2180 /* Prevent intel_pstate_update_util() from using stale data. */
2181 cpu->sample.time = 0;
2182 cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
2184 intel_pstate_update_util_hwp :
2185 intel_pstate_update_util));
2186 cpu->update_util_set = true;
2189 static void intel_pstate_clear_update_util_hook(unsigned int cpu)
2191 struct cpudata *cpu_data = all_cpu_data[cpu];
2193 if (!cpu_data->update_util_set)
2196 cpufreq_remove_update_util_hook(cpu);
2197 cpu_data->update_util_set = false;
2201 static int intel_pstate_get_max_freq(struct cpudata *cpu)
2203 return global.turbo_disabled || global.no_turbo ?
2204 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2207 static void intel_pstate_update_perf_limits(struct cpudata *cpu,
2208 unsigned int policy_min,
2209 unsigned int policy_max)
2211 int32_t max_policy_perf, min_policy_perf;
2212 int max_state, turbo_max;
2216 * HWP needs some special consideration, because on BDX the
2217 * HWP_REQUEST uses abstract value to represent performance
2218 * rather than pure ratios.
2221 intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
2223 max_state = global.no_turbo || global.turbo_disabled ?
2224 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
2225 turbo_max = cpu->pstate.turbo_pstate;
2227 max_freq = max_state * cpu->pstate.scaling;
2229 max_policy_perf = max_state * policy_max / max_freq;
2230 if (policy_max == policy_min) {
2231 min_policy_perf = max_policy_perf;
2233 min_policy_perf = max_state * policy_min / max_freq;
2234 min_policy_perf = clamp_t(int32_t, min_policy_perf,
2235 0, max_policy_perf);
2238 pr_debug("cpu:%d max_state %d min_policy_perf:%d max_policy_perf:%d\n",
2239 cpu->cpu, max_state, min_policy_perf, max_policy_perf);
2241 /* Normalize user input to [min_perf, max_perf] */
2242 if (per_cpu_limits) {
2243 cpu->min_perf_ratio = min_policy_perf;
2244 cpu->max_perf_ratio = max_policy_perf;
2246 int32_t global_min, global_max;
2248 /* Global limits are in percent of the maximum turbo P-state. */
2249 global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
2250 global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
2251 global_min = clamp_t(int32_t, global_min, 0, global_max);
2253 pr_debug("cpu:%d global_min:%d global_max:%d\n", cpu->cpu,
2254 global_min, global_max);
2256 cpu->min_perf_ratio = max(min_policy_perf, global_min);
2257 cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf);
2258 cpu->max_perf_ratio = min(max_policy_perf, global_max);
2259 cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio);
2261 /* Make sure min_perf <= max_perf */
2262 cpu->min_perf_ratio = min(cpu->min_perf_ratio,
2263 cpu->max_perf_ratio);
2266 pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", cpu->cpu,
2267 cpu->max_perf_ratio,
2268 cpu->min_perf_ratio);
2271 static int intel_pstate_set_policy(struct cpufreq_policy *policy)
2273 struct cpudata *cpu;
2275 if (!policy->cpuinfo.max_freq)
2278 pr_debug("set_policy cpuinfo.max %u policy->max %u\n",
2279 policy->cpuinfo.max_freq, policy->max);
2281 cpu = all_cpu_data[policy->cpu];
2282 cpu->policy = policy->policy;
2284 mutex_lock(&intel_pstate_limits_lock);
2286 intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2288 if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
2290 * NOHZ_FULL CPUs need this as the governor callback may not
2291 * be invoked on them.
2293 intel_pstate_clear_update_util_hook(policy->cpu);
2294 intel_pstate_max_within_limits(cpu);
2296 intel_pstate_set_update_util_hook(policy->cpu);
2301 * When hwp_boost was active before and dynamically it
2302 * was turned off, in that case we need to clear the
2306 intel_pstate_clear_update_util_hook(policy->cpu);
2307 intel_pstate_hwp_set(policy->cpu);
2310 mutex_unlock(&intel_pstate_limits_lock);
2315 static void intel_pstate_adjust_policy_max(struct cpudata *cpu,
2316 struct cpufreq_policy_data *policy)
2319 cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate &&
2320 policy->max < policy->cpuinfo.max_freq &&
2321 policy->max > cpu->pstate.max_freq) {
2322 pr_debug("policy->max > max non turbo frequency\n");
2323 policy->max = policy->cpuinfo.max_freq;
2327 static void intel_pstate_verify_cpu_policy(struct cpudata *cpu,
2328 struct cpufreq_policy_data *policy)
2332 update_turbo_state();
2334 int max_state, turbo_max;
2336 intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
2337 max_freq = max_state * cpu->pstate.scaling;
2339 max_freq = intel_pstate_get_max_freq(cpu);
2341 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, max_freq);
2343 intel_pstate_adjust_policy_max(cpu, policy);
2346 static int intel_pstate_verify_policy(struct cpufreq_policy_data *policy)
2348 intel_pstate_verify_cpu_policy(all_cpu_data[policy->cpu], policy);
2353 static int intel_pstate_cpu_offline(struct cpufreq_policy *policy)
2355 struct cpudata *cpu = all_cpu_data[policy->cpu];
2357 pr_debug("CPU %d going offline\n", cpu->cpu);
2363 * If the CPU is an SMT thread and it goes offline with the performance
2364 * settings different from the minimum, it will prevent its sibling
2365 * from getting to lower performance levels, so force the minimum
2366 * performance on CPU offline to prevent that from happening.
2369 intel_pstate_hwp_offline(cpu);
2371 intel_pstate_set_min_pstate(cpu);
2373 intel_pstate_exit_perf_limits(policy);
2378 static int intel_pstate_cpu_online(struct cpufreq_policy *policy)
2380 struct cpudata *cpu = all_cpu_data[policy->cpu];
2382 pr_debug("CPU %d going online\n", cpu->cpu);
2384 intel_pstate_init_acpi_perf_limits(policy);
2388 * Re-enable HWP and clear the "suspended" flag to let "resume"
2389 * know that it need not do that.
2391 intel_pstate_hwp_reenable(cpu);
2392 cpu->suspended = false;
2398 static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
2400 pr_debug("CPU %d stopping\n", policy->cpu);
2402 intel_pstate_clear_update_util_hook(policy->cpu);
2405 static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
2407 pr_debug("CPU %d exiting\n", policy->cpu);
2409 policy->fast_switch_possible = false;
2414 static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
2416 struct cpudata *cpu;
2419 rc = intel_pstate_init_cpu(policy->cpu);
2423 cpu = all_cpu_data[policy->cpu];
2425 cpu->max_perf_ratio = 0xFF;
2426 cpu->min_perf_ratio = 0;
2428 policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
2429 policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
2431 /* cpuinfo and default policy values */
2432 policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
2433 update_turbo_state();
2434 global.turbo_disabled_mf = global.turbo_disabled;
2435 policy->cpuinfo.max_freq = global.turbo_disabled ?
2436 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
2437 policy->cpuinfo.max_freq *= cpu->pstate.scaling;
2440 unsigned int max_freq;
2442 max_freq = global.turbo_disabled ?
2443 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2444 if (max_freq < policy->cpuinfo.max_freq)
2445 policy->cpuinfo.max_freq = max_freq;
2448 intel_pstate_init_acpi_perf_limits(policy);
2450 policy->fast_switch_possible = true;
2455 static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
2457 int ret = __intel_pstate_cpu_init(policy);
2463 * Set the policy to powersave to provide a valid fallback value in case
2464 * the default cpufreq governor is neither powersave nor performance.
2466 policy->policy = CPUFREQ_POLICY_POWERSAVE;
2469 struct cpudata *cpu = all_cpu_data[policy->cpu];
2471 cpu->epp_cached = intel_pstate_get_epp(cpu, 0);
2477 static struct cpufreq_driver intel_pstate = {
2478 .flags = CPUFREQ_CONST_LOOPS,
2479 .verify = intel_pstate_verify_policy,
2480 .setpolicy = intel_pstate_set_policy,
2481 .suspend = intel_pstate_suspend,
2482 .resume = intel_pstate_resume,
2483 .init = intel_pstate_cpu_init,
2484 .exit = intel_pstate_cpu_exit,
2485 .stop_cpu = intel_pstate_stop_cpu,
2486 .offline = intel_pstate_cpu_offline,
2487 .online = intel_pstate_cpu_online,
2488 .update_limits = intel_pstate_update_limits,
2489 .name = "intel_pstate",
2492 static int intel_cpufreq_verify_policy(struct cpufreq_policy_data *policy)
2494 struct cpudata *cpu = all_cpu_data[policy->cpu];
2496 intel_pstate_verify_cpu_policy(cpu, policy);
2497 intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2502 /* Use of trace in passive mode:
2504 * In passive mode the trace core_busy field (also known as the
2505 * performance field, and lablelled as such on the graphs; also known as
2506 * core_avg_perf) is not needed and so is re-assigned to indicate if the
2507 * driver call was via the normal or fast switch path. Various graphs
2508 * output from the intel_pstate_tracer.py utility that include core_busy
2509 * (or performance or core_avg_perf) have a fixed y-axis from 0 to 100%,
2510 * so we use 10 to indicate the the normal path through the driver, and
2511 * 90 to indicate the fast switch path through the driver.
2512 * The scaled_busy field is not used, and is set to 0.
2515 #define INTEL_PSTATE_TRACE_TARGET 10
2516 #define INTEL_PSTATE_TRACE_FAST_SWITCH 90
2518 static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, int old_pstate)
2520 struct sample *sample;
2522 if (!trace_pstate_sample_enabled())
2525 if (!intel_pstate_sample(cpu, ktime_get()))
2528 sample = &cpu->sample;
2529 trace_pstate_sample(trace_type,
2532 cpu->pstate.current_pstate,
2536 get_avg_frequency(cpu),
2537 fp_toint(cpu->iowait_boost * 100));
2540 static void intel_cpufreq_adjust_hwp(struct cpudata *cpu, u32 target_pstate,
2541 bool strict, bool fast_switch)
2543 u64 prev = READ_ONCE(cpu->hwp_req_cached), value = prev;
2545 value &= ~HWP_MIN_PERF(~0L);
2546 value |= HWP_MIN_PERF(target_pstate);
2549 * The entire MSR needs to be updated in order to update the HWP min
2550 * field in it, so opportunistically update the max too if needed.
2552 value &= ~HWP_MAX_PERF(~0L);
2553 value |= HWP_MAX_PERF(strict ? target_pstate : cpu->max_perf_ratio);
2558 WRITE_ONCE(cpu->hwp_req_cached, value);
2560 wrmsrl(MSR_HWP_REQUEST, value);
2562 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
2565 static void intel_cpufreq_adjust_perf_ctl(struct cpudata *cpu,
2566 u32 target_pstate, bool fast_switch)
2569 wrmsrl(MSR_IA32_PERF_CTL,
2570 pstate_funcs.get_val(cpu, target_pstate));
2572 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
2573 pstate_funcs.get_val(cpu, target_pstate));
2576 static int intel_cpufreq_update_pstate(struct cpufreq_policy *policy,
2577 int target_pstate, bool fast_switch)
2579 struct cpudata *cpu = all_cpu_data[policy->cpu];
2580 int old_pstate = cpu->pstate.current_pstate;
2582 target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
2584 intel_cpufreq_adjust_hwp(cpu, target_pstate,
2585 policy->strict_target, fast_switch);
2586 cpu->pstate.current_pstate = target_pstate;
2587 } else if (target_pstate != old_pstate) {
2588 intel_cpufreq_adjust_perf_ctl(cpu, target_pstate, fast_switch);
2589 cpu->pstate.current_pstate = target_pstate;
2592 intel_cpufreq_trace(cpu, fast_switch ? INTEL_PSTATE_TRACE_FAST_SWITCH :
2593 INTEL_PSTATE_TRACE_TARGET, old_pstate);
2595 return target_pstate;
2598 static int intel_cpufreq_target(struct cpufreq_policy *policy,
2599 unsigned int target_freq,
2600 unsigned int relation)
2602 struct cpudata *cpu = all_cpu_data[policy->cpu];
2603 struct cpufreq_freqs freqs;
2606 update_turbo_state();
2608 freqs.old = policy->cur;
2609 freqs.new = target_freq;
2611 cpufreq_freq_transition_begin(policy, &freqs);
2614 case CPUFREQ_RELATION_L:
2615 target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling);
2617 case CPUFREQ_RELATION_H:
2618 target_pstate = freqs.new / cpu->pstate.scaling;
2621 target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling);
2625 target_pstate = intel_cpufreq_update_pstate(policy, target_pstate, false);
2627 freqs.new = target_pstate * cpu->pstate.scaling;
2629 cpufreq_freq_transition_end(policy, &freqs, false);
2634 static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
2635 unsigned int target_freq)
2637 struct cpudata *cpu = all_cpu_data[policy->cpu];
2640 update_turbo_state();
2642 target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling);
2644 target_pstate = intel_cpufreq_update_pstate(policy, target_pstate, true);
2646 return target_pstate * cpu->pstate.scaling;
2649 static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
2651 int max_state, turbo_max, min_freq, max_freq, ret;
2652 struct freq_qos_request *req;
2653 struct cpudata *cpu;
2656 dev = get_cpu_device(policy->cpu);
2660 ret = __intel_pstate_cpu_init(policy);
2664 policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY;
2665 /* This reflects the intel_pstate_get_cpu_pstates() setting. */
2666 policy->cur = policy->cpuinfo.min_freq;
2668 req = kcalloc(2, sizeof(*req), GFP_KERNEL);
2674 cpu = all_cpu_data[policy->cpu];
2679 intel_pstate_get_hwp_max(cpu, &turbo_max, &max_state);
2680 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY_HWP;
2681 rdmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, &value);
2682 WRITE_ONCE(cpu->hwp_req_cached, value);
2683 cpu->epp_cached = intel_pstate_get_epp(cpu, value);
2685 turbo_max = cpu->pstate.turbo_pstate;
2686 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY;
2689 min_freq = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
2690 min_freq *= cpu->pstate.scaling;
2691 max_freq = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
2692 max_freq *= cpu->pstate.scaling;
2694 ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MIN,
2697 dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
2701 ret = freq_qos_add_request(&policy->constraints, req + 1, FREQ_QOS_MAX,
2704 dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
2705 goto remove_min_req;
2708 policy->driver_data = req;
2713 freq_qos_remove_request(req);
2717 intel_pstate_exit_perf_limits(policy);
2722 static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy)
2724 struct freq_qos_request *req;
2726 req = policy->driver_data;
2728 freq_qos_remove_request(req + 1);
2729 freq_qos_remove_request(req);
2732 return intel_pstate_cpu_exit(policy);
2735 static struct cpufreq_driver intel_cpufreq = {
2736 .flags = CPUFREQ_CONST_LOOPS,
2737 .verify = intel_cpufreq_verify_policy,
2738 .target = intel_cpufreq_target,
2739 .fast_switch = intel_cpufreq_fast_switch,
2740 .init = intel_cpufreq_cpu_init,
2741 .exit = intel_cpufreq_cpu_exit,
2742 .offline = intel_pstate_cpu_offline,
2743 .online = intel_pstate_cpu_online,
2744 .suspend = intel_pstate_suspend,
2745 .resume = intel_pstate_resume,
2746 .update_limits = intel_pstate_update_limits,
2747 .name = "intel_cpufreq",
2750 static struct cpufreq_driver *default_driver;
2752 static void intel_pstate_driver_cleanup(void)
2757 for_each_online_cpu(cpu) {
2758 if (all_cpu_data[cpu]) {
2759 if (intel_pstate_driver == &intel_pstate)
2760 intel_pstate_clear_update_util_hook(cpu);
2762 kfree(all_cpu_data[cpu]);
2763 all_cpu_data[cpu] = NULL;
2768 intel_pstate_driver = NULL;
2771 static int intel_pstate_register_driver(struct cpufreq_driver *driver)
2775 if (driver == &intel_pstate)
2776 intel_pstate_sysfs_expose_hwp_dynamic_boost();
2778 memset(&global, 0, sizeof(global));
2779 global.max_perf_pct = 100;
2781 intel_pstate_driver = driver;
2782 ret = cpufreq_register_driver(intel_pstate_driver);
2784 intel_pstate_driver_cleanup();
2788 global.min_perf_pct = min_perf_pct_min();
2793 static ssize_t intel_pstate_show_status(char *buf)
2795 if (!intel_pstate_driver)
2796 return sprintf(buf, "off\n");
2798 return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
2799 "active" : "passive");
2802 static int intel_pstate_update_status(const char *buf, size_t size)
2804 if (size == 3 && !strncmp(buf, "off", size)) {
2805 if (!intel_pstate_driver)
2811 cpufreq_unregister_driver(intel_pstate_driver);
2812 intel_pstate_driver_cleanup();
2816 if (size == 6 && !strncmp(buf, "active", size)) {
2817 if (intel_pstate_driver) {
2818 if (intel_pstate_driver == &intel_pstate)
2821 cpufreq_unregister_driver(intel_pstate_driver);
2824 return intel_pstate_register_driver(&intel_pstate);
2827 if (size == 7 && !strncmp(buf, "passive", size)) {
2828 if (intel_pstate_driver) {
2829 if (intel_pstate_driver == &intel_cpufreq)
2832 cpufreq_unregister_driver(intel_pstate_driver);
2833 intel_pstate_sysfs_hide_hwp_dynamic_boost();
2836 return intel_pstate_register_driver(&intel_cpufreq);
2842 static int no_load __initdata;
2843 static int no_hwp __initdata;
2844 static int hwp_only __initdata;
2845 static unsigned int force_load __initdata;
2847 static int __init intel_pstate_msrs_not_valid(void)
2849 if (!pstate_funcs.get_max() ||
2850 !pstate_funcs.get_min() ||
2851 !pstate_funcs.get_turbo())
2857 static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
2859 pstate_funcs.get_max = funcs->get_max;
2860 pstate_funcs.get_max_physical = funcs->get_max_physical;
2861 pstate_funcs.get_min = funcs->get_min;
2862 pstate_funcs.get_turbo = funcs->get_turbo;
2863 pstate_funcs.get_scaling = funcs->get_scaling;
2864 pstate_funcs.get_val = funcs->get_val;
2865 pstate_funcs.get_vid = funcs->get_vid;
2866 pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
2871 static bool __init intel_pstate_no_acpi_pss(void)
2875 for_each_possible_cpu(i) {
2877 union acpi_object *pss;
2878 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2879 struct acpi_processor *pr = per_cpu(processors, i);
2884 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
2885 if (ACPI_FAILURE(status))
2888 pss = buffer.pointer;
2889 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
2897 pr_debug("ACPI _PSS not found\n");
2901 static bool __init intel_pstate_no_acpi_pcch(void)
2906 status = acpi_get_handle(NULL, "\\_SB", &handle);
2907 if (ACPI_FAILURE(status))
2910 if (acpi_has_method(handle, "PCCH"))
2914 pr_debug("ACPI PCCH not found\n");
2918 static bool __init intel_pstate_has_acpi_ppc(void)
2922 for_each_possible_cpu(i) {
2923 struct acpi_processor *pr = per_cpu(processors, i);
2927 if (acpi_has_method(pr->handle, "_PPC"))
2930 pr_debug("ACPI _PPC not found\n");
2939 /* Hardware vendor-specific info that has its own power management modes */
2940 static struct acpi_platform_list plat_info[] __initdata = {
2941 {"HP ", "ProLiant", 0, ACPI_SIG_FADT, all_versions, NULL, PSS},
2942 {"ORACLE", "X4-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2943 {"ORACLE", "X4-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2944 {"ORACLE", "X4-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2945 {"ORACLE", "X3-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2946 {"ORACLE", "X3-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2947 {"ORACLE", "X3-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2948 {"ORACLE", "X4470M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2949 {"ORACLE", "X4270M3 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2950 {"ORACLE", "X4270M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2951 {"ORACLE", "X4170M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2952 {"ORACLE", "X4170 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2953 {"ORACLE", "X4275 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2954 {"ORACLE", "X6-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2955 {"ORACLE", "Sudbury ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2959 #define BITMASK_OOB (BIT(8) | BIT(18))
2961 static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
2963 const struct x86_cpu_id *id;
2967 id = x86_match_cpu(intel_pstate_cpu_oob_ids);
2969 rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
2970 if (misc_pwr & BITMASK_OOB) {
2971 pr_debug("Bit 8 or 18 in the MISC_PWR_MGMT MSR set\n");
2972 pr_debug("P states are controlled in Out of Band mode by the firmware/hardware\n");
2977 idx = acpi_match_platform_list(plat_info);
2981 switch (plat_info[idx].data) {
2983 if (!intel_pstate_no_acpi_pss())
2986 return intel_pstate_no_acpi_pcch();
2988 return intel_pstate_has_acpi_ppc() && !force_load;
2994 static void intel_pstate_request_control_from_smm(void)
2997 * It may be unsafe to request P-states control from SMM if _PPC support
2998 * has not been enabled.
3001 acpi_processor_pstate_control();
3003 #else /* CONFIG_ACPI not enabled */
3004 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
3005 static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
3006 static inline void intel_pstate_request_control_from_smm(void) {}
3007 #endif /* CONFIG_ACPI */
3009 #define INTEL_PSTATE_HWP_BROADWELL 0x01
3011 #define X86_MATCH_HWP(model, hwp_mode) \
3012 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
3013 X86_FEATURE_HWP, hwp_mode)
3015 static const struct x86_cpu_id hwp_support_ids[] __initconst = {
3016 X86_MATCH_HWP(BROADWELL_X, INTEL_PSTATE_HWP_BROADWELL),
3017 X86_MATCH_HWP(BROADWELL_D, INTEL_PSTATE_HWP_BROADWELL),
3018 X86_MATCH_HWP(ANY, 0),
3022 static bool intel_pstate_hwp_is_enabled(void)
3026 rdmsrl(MSR_PM_ENABLE, value);
3027 return !!(value & 0x1);
3030 static int __init intel_pstate_init(void)
3032 const struct x86_cpu_id *id;
3035 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
3038 id = x86_match_cpu(hwp_support_ids);
3040 bool hwp_forced = intel_pstate_hwp_is_enabled();
3043 pr_info("HWP enabled by BIOS\n");
3047 copy_cpu_funcs(&core_funcs);
3049 * Avoid enabling HWP for processors without EPP support,
3050 * because that means incomplete HWP implementation which is a
3051 * corner case and supporting it is generally problematic.
3053 * If HWP is enabled already, though, there is no choice but to
3056 if ((!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) || hwp_forced) {
3058 hwp_mode_bdw = id->driver_data;
3059 intel_pstate.attr = hwp_cpufreq_attrs;
3060 intel_cpufreq.attr = hwp_cpufreq_attrs;
3061 intel_cpufreq.flags |= CPUFREQ_NEED_UPDATE_LIMITS;
3062 if (!default_driver)
3063 default_driver = &intel_pstate;
3065 goto hwp_cpu_matched;
3067 pr_info("HWP not enabled\n");
3072 id = x86_match_cpu(intel_pstate_cpu_ids);
3074 pr_info("CPU model not supported\n");
3078 copy_cpu_funcs((struct pstate_funcs *)id->driver_data);
3081 if (intel_pstate_msrs_not_valid()) {
3082 pr_info("Invalid MSRs\n");
3085 /* Without HWP start in the passive mode. */
3086 if (!default_driver)
3087 default_driver = &intel_cpufreq;
3091 * The Intel pstate driver will be ignored if the platform
3092 * firmware has its own power management modes.
3094 if (intel_pstate_platform_pwr_mgmt_exists()) {
3095 pr_info("P-states controlled by the platform\n");
3099 if (!hwp_active && hwp_only)
3102 pr_info("Intel P-state driver initializing\n");
3104 all_cpu_data = vzalloc(array_size(sizeof(void *), num_possible_cpus()));
3108 intel_pstate_request_control_from_smm();
3110 intel_pstate_sysfs_expose_params();
3112 mutex_lock(&intel_pstate_driver_lock);
3113 rc = intel_pstate_register_driver(default_driver);
3114 mutex_unlock(&intel_pstate_driver_lock);
3116 intel_pstate_sysfs_remove();
3121 const struct x86_cpu_id *id;
3123 id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
3125 set_power_ctl_ee_state(false);
3126 pr_info("Disabling energy efficiency optimization\n");
3129 pr_info("HWP enabled\n");
3134 device_initcall(intel_pstate_init);
3136 static int __init intel_pstate_setup(char *str)
3141 if (!strcmp(str, "disable"))
3143 else if (!strcmp(str, "active"))
3144 default_driver = &intel_pstate;
3145 else if (!strcmp(str, "passive"))
3146 default_driver = &intel_cpufreq;
3148 if (!strcmp(str, "no_hwp"))
3151 if (!strcmp(str, "force"))
3153 if (!strcmp(str, "hwp_only"))
3155 if (!strcmp(str, "per_cpu_perf_limits"))
3156 per_cpu_limits = true;
3159 if (!strcmp(str, "support_acpi_ppc"))
3165 early_param("intel_pstate", intel_pstate_setup);
3167 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
3168 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
3169 MODULE_LICENSE("GPL");