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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * intel_pstate.c: Native P state management for Intel processors
4 *
5 * (C) Copyright 2012 Intel Corporation
6 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
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>
24#include <linux/fs.h>
25#include <linux/acpi.h>
26#include <linux/vmalloc.h>
27#include <linux/pm_qos.h>
28#include <trace/events/power.h>
29
30#include <asm/cpu.h>
31#include <asm/div64.h>
32#include <asm/msr.h>
33#include <asm/cpu_device_id.h>
34#include <asm/cpufeature.h>
35#include <asm/intel-family.h>
36#include "../drivers/thermal/intel/thermal_interrupt.h"
37
38#define INTEL_PSTATE_SAMPLING_INTERVAL (10 * NSEC_PER_MSEC)
39
40#define INTEL_CPUFREQ_TRANSITION_LATENCY 20000
41#define INTEL_CPUFREQ_TRANSITION_DELAY_HWP 5000
42#define INTEL_CPUFREQ_TRANSITION_DELAY 500
43
44#ifdef CONFIG_ACPI
45#include <acpi/processor.h>
46#include <acpi/cppc_acpi.h>
47#endif
48
49#define FRAC_BITS 8
50#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
51#define fp_toint(X) ((X) >> FRAC_BITS)
52
53#define ONE_EIGHTH_FP ((int64_t)1 << (FRAC_BITS - 3))
54
55#define EXT_BITS 6
56#define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS)
57#define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS)
58#define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS)
59
60static inline int32_t mul_fp(int32_t x, int32_t y)
61{
62 return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
63}
64
65static inline int32_t div_fp(s64 x, s64 y)
66{
67 return div64_s64((int64_t)x << FRAC_BITS, y);
68}
69
70static inline int ceiling_fp(int32_t x)
71{
72 int mask, ret;
73
74 ret = fp_toint(x);
75 mask = (1 << FRAC_BITS) - 1;
76 if (x & mask)
77 ret += 1;
78 return ret;
79}
80
81static inline u64 mul_ext_fp(u64 x, u64 y)
82{
83 return (x * y) >> EXT_FRAC_BITS;
84}
85
86static inline u64 div_ext_fp(u64 x, u64 y)
87{
88 return div64_u64(x << EXT_FRAC_BITS, y);
89}
90
91/**
92 * struct sample - Store performance sample
93 * @core_avg_perf: Ratio of APERF/MPERF which is the actual average
94 * performance during last sample period
95 * @busy_scaled: Scaled busy value which is used to calculate next
96 * P state. This can be different than core_avg_perf
97 * to account for cpu idle period
98 * @aperf: Difference of actual performance frequency clock count
99 * read from APERF MSR between last and current sample
100 * @mperf: Difference of maximum performance frequency clock count
101 * read from MPERF MSR between last and current sample
102 * @tsc: Difference of time stamp counter between last and
103 * current sample
104 * @time: Current time from scheduler
105 *
106 * This structure is used in the cpudata structure to store performance sample
107 * data for choosing next P State.
108 */
109struct sample {
110 int32_t core_avg_perf;
111 int32_t busy_scaled;
112 u64 aperf;
113 u64 mperf;
114 u64 tsc;
115 u64 time;
116};
117
118/**
119 * struct pstate_data - Store P state data
120 * @current_pstate: Current requested P state
121 * @min_pstate: Min P state possible for this platform
122 * @max_pstate: Max P state possible for this platform
123 * @max_pstate_physical:This is physical Max P state for a processor
124 * This can be higher than the max_pstate which can
125 * be limited by platform thermal design power limits
126 * @perf_ctl_scaling: PERF_CTL P-state to frequency scaling factor
127 * @scaling: Scaling factor between performance and frequency
128 * @turbo_pstate: Max Turbo P state possible for this platform
129 * @min_freq: @min_pstate frequency in cpufreq units
130 * @max_freq: @max_pstate frequency in cpufreq units
131 * @turbo_freq: @turbo_pstate frequency in cpufreq units
132 *
133 * Stores the per cpu model P state limits and current P state.
134 */
135struct pstate_data {
136 int current_pstate;
137 int min_pstate;
138 int max_pstate;
139 int max_pstate_physical;
140 int perf_ctl_scaling;
141 int scaling;
142 int turbo_pstate;
143 unsigned int min_freq;
144 unsigned int max_freq;
145 unsigned int turbo_freq;
146};
147
148/**
149 * struct vid_data - Stores voltage information data
150 * @min: VID data for this platform corresponding to
151 * the lowest P state
152 * @max: VID data corresponding to the highest P State.
153 * @turbo: VID data for turbo P state
154 * @ratio: Ratio of (vid max - vid min) /
155 * (max P state - Min P State)
156 *
157 * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling)
158 * This data is used in Atom platforms, where in addition to target P state,
159 * the voltage data needs to be specified to select next P State.
160 */
161struct vid_data {
162 int min;
163 int max;
164 int turbo;
165 int32_t ratio;
166};
167
168/**
169 * struct global_params - Global parameters, mostly tunable via sysfs.
170 * @no_turbo: Whether or not to use turbo P-states.
171 * @turbo_disabled: Whether or not turbo P-states are available at all,
172 * based on the MSR_IA32_MISC_ENABLE value and whether or
173 * not the maximum reported turbo P-state is different from
174 * the maximum reported non-turbo one.
175 * @turbo_disabled_mf: The @turbo_disabled value reflected by cpuinfo.max_freq.
176 * @min_perf_pct: Minimum capacity limit in percent of the maximum turbo
177 * P-state capacity.
178 * @max_perf_pct: Maximum capacity limit in percent of the maximum turbo
179 * P-state capacity.
180 */
181struct global_params {
182 bool no_turbo;
183 bool turbo_disabled;
184 bool turbo_disabled_mf;
185 int max_perf_pct;
186 int min_perf_pct;
187};
188
189/**
190 * struct cpudata - Per CPU instance data storage
191 * @cpu: CPU number for this instance data
192 * @policy: CPUFreq policy value
193 * @update_util: CPUFreq utility callback information
194 * @update_util_set: CPUFreq utility callback is set
195 * @iowait_boost: iowait-related boost fraction
196 * @last_update: Time of the last update.
197 * @pstate: Stores P state limits for this CPU
198 * @vid: Stores VID limits for this CPU
199 * @last_sample_time: Last Sample time
200 * @aperf_mperf_shift: APERF vs MPERF counting frequency difference
201 * @prev_aperf: Last APERF value read from APERF MSR
202 * @prev_mperf: Last MPERF value read from MPERF MSR
203 * @prev_tsc: Last timestamp counter (TSC) value
204 * @prev_cummulative_iowait: IO Wait time difference from last and
205 * current sample
206 * @sample: Storage for storing last Sample data
207 * @min_perf_ratio: Minimum capacity in terms of PERF or HWP ratios
208 * @max_perf_ratio: Maximum capacity in terms of PERF or HWP ratios
209 * @acpi_perf_data: Stores ACPI perf information read from _PSS
210 * @valid_pss_table: Set to true for valid ACPI _PSS entries found
211 * @epp_powersave: Last saved HWP energy performance preference
212 * (EPP) or energy performance bias (EPB),
213 * when policy switched to performance
214 * @epp_policy: Last saved policy used to set EPP/EPB
215 * @epp_default: Power on default HWP energy performance
216 * preference/bias
217 * @epp_cached Cached HWP energy-performance preference value
218 * @hwp_req_cached: Cached value of the last HWP Request MSR
219 * @hwp_cap_cached: Cached value of the last HWP Capabilities MSR
220 * @last_io_update: Last time when IO wake flag was set
221 * @sched_flags: Store scheduler flags for possible cross CPU update
222 * @hwp_boost_min: Last HWP boosted min performance
223 * @suspended: Whether or not the driver has been suspended.
224 * @hwp_notify_work: workqueue for HWP notifications.
225 *
226 * This structure stores per CPU instance data for all CPUs.
227 */
228struct cpudata {
229 int cpu;
230
231 unsigned int policy;
232 struct update_util_data update_util;
233 bool update_util_set;
234
235 struct pstate_data pstate;
236 struct vid_data vid;
237
238 u64 last_update;
239 u64 last_sample_time;
240 u64 aperf_mperf_shift;
241 u64 prev_aperf;
242 u64 prev_mperf;
243 u64 prev_tsc;
244 u64 prev_cummulative_iowait;
245 struct sample sample;
246 int32_t min_perf_ratio;
247 int32_t max_perf_ratio;
248#ifdef CONFIG_ACPI
249 struct acpi_processor_performance acpi_perf_data;
250 bool valid_pss_table;
251#endif
252 unsigned int iowait_boost;
253 s16 epp_powersave;
254 s16 epp_policy;
255 s16 epp_default;
256 s16 epp_cached;
257 u64 hwp_req_cached;
258 u64 hwp_cap_cached;
259 u64 last_io_update;
260 unsigned int sched_flags;
261 u32 hwp_boost_min;
262 bool suspended;
263 struct delayed_work hwp_notify_work;
264};
265
266static struct cpudata **all_cpu_data;
267
268/**
269 * struct pstate_funcs - Per CPU model specific callbacks
270 * @get_max: Callback to get maximum non turbo effective P state
271 * @get_max_physical: Callback to get maximum non turbo physical P state
272 * @get_min: Callback to get minimum P state
273 * @get_turbo: Callback to get turbo P state
274 * @get_scaling: Callback to get frequency scaling factor
275 * @get_cpu_scaling: Get frequency scaling factor for a given cpu
276 * @get_aperf_mperf_shift: Callback to get the APERF vs MPERF frequency difference
277 * @get_val: Callback to convert P state to actual MSR write value
278 * @get_vid: Callback to get VID data for Atom platforms
279 *
280 * Core and Atom CPU models have different way to get P State limits. This
281 * structure is used to store those callbacks.
282 */
283struct pstate_funcs {
284 int (*get_max)(int cpu);
285 int (*get_max_physical)(int cpu);
286 int (*get_min)(int cpu);
287 int (*get_turbo)(int cpu);
288 int (*get_scaling)(void);
289 int (*get_cpu_scaling)(int cpu);
290 int (*get_aperf_mperf_shift)(void);
291 u64 (*get_val)(struct cpudata*, int pstate);
292 void (*get_vid)(struct cpudata *);
293};
294
295static struct pstate_funcs pstate_funcs __read_mostly;
296
297static int hwp_active __read_mostly;
298static int hwp_mode_bdw __read_mostly;
299static bool per_cpu_limits __read_mostly;
300static bool hwp_boost __read_mostly;
301static bool hwp_forced __read_mostly;
302
303static struct cpufreq_driver *intel_pstate_driver __read_mostly;
304
305#define HYBRID_SCALING_FACTOR 78741
306#define HYBRID_SCALING_FACTOR_MTL 80000
307
308static int hybrid_scaling_factor = HYBRID_SCALING_FACTOR;
309
310static inline int core_get_scaling(void)
311{
312 return 100000;
313}
314
315#ifdef CONFIG_ACPI
316static bool acpi_ppc;
317#endif
318
319static struct global_params global;
320
321static DEFINE_MUTEX(intel_pstate_driver_lock);
322static DEFINE_MUTEX(intel_pstate_limits_lock);
323
324#ifdef CONFIG_ACPI
325
326static bool intel_pstate_acpi_pm_profile_server(void)
327{
328 if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER ||
329 acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER)
330 return true;
331
332 return false;
333}
334
335static bool intel_pstate_get_ppc_enable_status(void)
336{
337 if (intel_pstate_acpi_pm_profile_server())
338 return true;
339
340 return acpi_ppc;
341}
342
343#ifdef CONFIG_ACPI_CPPC_LIB
344
345/* The work item is needed to avoid CPU hotplug locking issues */
346static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
347{
348 sched_set_itmt_support();
349}
350
351static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
352
353#define CPPC_MAX_PERF U8_MAX
354
355static void intel_pstate_set_itmt_prio(int cpu)
356{
357 struct cppc_perf_caps cppc_perf;
358 static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
359 int ret;
360
361 ret = cppc_get_perf_caps(cpu, &cppc_perf);
362 if (ret)
363 return;
364
365 /*
366 * On some systems with overclocking enabled, CPPC.highest_perf is hardcoded to 0xff.
367 * In this case we can't use CPPC.highest_perf to enable ITMT.
368 * In this case we can look at MSR_HWP_CAPABILITIES bits [8:0] to decide.
369 */
370 if (cppc_perf.highest_perf == CPPC_MAX_PERF)
371 cppc_perf.highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached));
372
373 /*
374 * The priorities can be set regardless of whether or not
375 * sched_set_itmt_support(true) has been called and it is valid to
376 * update them at any time after it has been called.
377 */
378 sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
379
380 if (max_highest_perf <= min_highest_perf) {
381 if (cppc_perf.highest_perf > max_highest_perf)
382 max_highest_perf = cppc_perf.highest_perf;
383
384 if (cppc_perf.highest_perf < min_highest_perf)
385 min_highest_perf = cppc_perf.highest_perf;
386
387 if (max_highest_perf > min_highest_perf) {
388 /*
389 * This code can be run during CPU online under the
390 * CPU hotplug locks, so sched_set_itmt_support()
391 * cannot be called from here. Queue up a work item
392 * to invoke it.
393 */
394 schedule_work(&sched_itmt_work);
395 }
396 }
397}
398
399static int intel_pstate_get_cppc_guaranteed(int cpu)
400{
401 struct cppc_perf_caps cppc_perf;
402 int ret;
403
404 ret = cppc_get_perf_caps(cpu, &cppc_perf);
405 if (ret)
406 return ret;
407
408 if (cppc_perf.guaranteed_perf)
409 return cppc_perf.guaranteed_perf;
410
411 return cppc_perf.nominal_perf;
412}
413
414static int intel_pstate_cppc_get_scaling(int cpu)
415{
416 struct cppc_perf_caps cppc_perf;
417 int ret;
418
419 ret = cppc_get_perf_caps(cpu, &cppc_perf);
420
421 /*
422 * If the nominal frequency and the nominal performance are not
423 * zero and the ratio between them is not 100, return the hybrid
424 * scaling factor.
425 */
426 if (!ret && cppc_perf.nominal_perf && cppc_perf.nominal_freq &&
427 cppc_perf.nominal_perf * 100 != cppc_perf.nominal_freq)
428 return hybrid_scaling_factor;
429
430 return core_get_scaling();
431}
432
433#else /* CONFIG_ACPI_CPPC_LIB */
434static inline void intel_pstate_set_itmt_prio(int cpu)
435{
436}
437#endif /* CONFIG_ACPI_CPPC_LIB */
438
439static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
440{
441 struct cpudata *cpu;
442 int ret;
443 int i;
444
445 if (hwp_active) {
446 intel_pstate_set_itmt_prio(policy->cpu);
447 return;
448 }
449
450 if (!intel_pstate_get_ppc_enable_status())
451 return;
452
453 cpu = all_cpu_data[policy->cpu];
454
455 ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
456 policy->cpu);
457 if (ret)
458 return;
459
460 /*
461 * Check if the control value in _PSS is for PERF_CTL MSR, which should
462 * guarantee that the states returned by it map to the states in our
463 * list directly.
464 */
465 if (cpu->acpi_perf_data.control_register.space_id !=
466 ACPI_ADR_SPACE_FIXED_HARDWARE)
467 goto err;
468
469 /*
470 * If there is only one entry _PSS, simply ignore _PSS and continue as
471 * usual without taking _PSS into account
472 */
473 if (cpu->acpi_perf_data.state_count < 2)
474 goto err;
475
476 pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu);
477 for (i = 0; i < cpu->acpi_perf_data.state_count; i++) {
478 pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n",
479 (i == cpu->acpi_perf_data.state ? '*' : ' '), i,
480 (u32) cpu->acpi_perf_data.states[i].core_frequency,
481 (u32) cpu->acpi_perf_data.states[i].power,
482 (u32) cpu->acpi_perf_data.states[i].control);
483 }
484
485 cpu->valid_pss_table = true;
486 pr_debug("_PPC limits will be enforced\n");
487
488 return;
489
490 err:
491 cpu->valid_pss_table = false;
492 acpi_processor_unregister_performance(policy->cpu);
493}
494
495static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
496{
497 struct cpudata *cpu;
498
499 cpu = all_cpu_data[policy->cpu];
500 if (!cpu->valid_pss_table)
501 return;
502
503 acpi_processor_unregister_performance(policy->cpu);
504}
505#else /* CONFIG_ACPI */
506static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
507{
508}
509
510static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
511{
512}
513
514static inline bool intel_pstate_acpi_pm_profile_server(void)
515{
516 return false;
517}
518#endif /* CONFIG_ACPI */
519
520#ifndef CONFIG_ACPI_CPPC_LIB
521static inline int intel_pstate_get_cppc_guaranteed(int cpu)
522{
523 return -ENOTSUPP;
524}
525
526static int intel_pstate_cppc_get_scaling(int cpu)
527{
528 return core_get_scaling();
529}
530#endif /* CONFIG_ACPI_CPPC_LIB */
531
532static int intel_pstate_freq_to_hwp_rel(struct cpudata *cpu, int freq,
533 unsigned int relation)
534{
535 if (freq == cpu->pstate.turbo_freq)
536 return cpu->pstate.turbo_pstate;
537
538 if (freq == cpu->pstate.max_freq)
539 return cpu->pstate.max_pstate;
540
541 switch (relation) {
542 case CPUFREQ_RELATION_H:
543 return freq / cpu->pstate.scaling;
544 case CPUFREQ_RELATION_C:
545 return DIV_ROUND_CLOSEST(freq, cpu->pstate.scaling);
546 }
547
548 return DIV_ROUND_UP(freq, cpu->pstate.scaling);
549}
550
551static int intel_pstate_freq_to_hwp(struct cpudata *cpu, int freq)
552{
553 return intel_pstate_freq_to_hwp_rel(cpu, freq, CPUFREQ_RELATION_L);
554}
555
556/**
557 * intel_pstate_hybrid_hwp_adjust - Calibrate HWP performance levels.
558 * @cpu: Target CPU.
559 *
560 * On hybrid processors, HWP may expose more performance levels than there are
561 * P-states accessible through the PERF_CTL interface. If that happens, the
562 * scaling factor between HWP performance levels and CPU frequency will be less
563 * than the scaling factor between P-state values and CPU frequency.
564 *
565 * In that case, adjust the CPU parameters used in computations accordingly.
566 */
567static void intel_pstate_hybrid_hwp_adjust(struct cpudata *cpu)
568{
569 int perf_ctl_max_phys = cpu->pstate.max_pstate_physical;
570 int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
571 int perf_ctl_turbo = pstate_funcs.get_turbo(cpu->cpu);
572 int scaling = cpu->pstate.scaling;
573 int freq;
574
575 pr_debug("CPU%d: perf_ctl_max_phys = %d\n", cpu->cpu, perf_ctl_max_phys);
576 pr_debug("CPU%d: perf_ctl_turbo = %d\n", cpu->cpu, perf_ctl_turbo);
577 pr_debug("CPU%d: perf_ctl_scaling = %d\n", cpu->cpu, perf_ctl_scaling);
578 pr_debug("CPU%d: HWP_CAP guaranteed = %d\n", cpu->cpu, cpu->pstate.max_pstate);
579 pr_debug("CPU%d: HWP_CAP highest = %d\n", cpu->cpu, cpu->pstate.turbo_pstate);
580 pr_debug("CPU%d: HWP-to-frequency scaling factor: %d\n", cpu->cpu, scaling);
581
582 cpu->pstate.turbo_freq = rounddown(cpu->pstate.turbo_pstate * scaling,
583 perf_ctl_scaling);
584 cpu->pstate.max_freq = rounddown(cpu->pstate.max_pstate * scaling,
585 perf_ctl_scaling);
586
587 freq = perf_ctl_max_phys * perf_ctl_scaling;
588 cpu->pstate.max_pstate_physical = intel_pstate_freq_to_hwp(cpu, freq);
589
590 freq = cpu->pstate.min_pstate * perf_ctl_scaling;
591 cpu->pstate.min_freq = freq;
592 /*
593 * Cast the min P-state value retrieved via pstate_funcs.get_min() to
594 * the effective range of HWP performance levels.
595 */
596 cpu->pstate.min_pstate = intel_pstate_freq_to_hwp(cpu, freq);
597}
598
599static inline void update_turbo_state(void)
600{
601 u64 misc_en;
602
603 rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
604 global.turbo_disabled = misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
605}
606
607static int min_perf_pct_min(void)
608{
609 struct cpudata *cpu = all_cpu_data[0];
610 int turbo_pstate = cpu->pstate.turbo_pstate;
611
612 return turbo_pstate ?
613 (cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
614}
615
616static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
617{
618 u64 epb;
619 int ret;
620
621 if (!boot_cpu_has(X86_FEATURE_EPB))
622 return -ENXIO;
623
624 ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
625 if (ret)
626 return (s16)ret;
627
628 return (s16)(epb & 0x0f);
629}
630
631static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
632{
633 s16 epp;
634
635 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
636 /*
637 * When hwp_req_data is 0, means that caller didn't read
638 * MSR_HWP_REQUEST, so need to read and get EPP.
639 */
640 if (!hwp_req_data) {
641 epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,
642 &hwp_req_data);
643 if (epp)
644 return epp;
645 }
646 epp = (hwp_req_data >> 24) & 0xff;
647 } else {
648 /* When there is no EPP present, HWP uses EPB settings */
649 epp = intel_pstate_get_epb(cpu_data);
650 }
651
652 return epp;
653}
654
655static int intel_pstate_set_epb(int cpu, s16 pref)
656{
657 u64 epb;
658 int ret;
659
660 if (!boot_cpu_has(X86_FEATURE_EPB))
661 return -ENXIO;
662
663 ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
664 if (ret)
665 return ret;
666
667 epb = (epb & ~0x0f) | pref;
668 wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb);
669
670 return 0;
671}
672
673/*
674 * EPP/EPB display strings corresponding to EPP index in the
675 * energy_perf_strings[]
676 * index String
677 *-------------------------------------
678 * 0 default
679 * 1 performance
680 * 2 balance_performance
681 * 3 balance_power
682 * 4 power
683 */
684
685enum energy_perf_value_index {
686 EPP_INDEX_DEFAULT = 0,
687 EPP_INDEX_PERFORMANCE,
688 EPP_INDEX_BALANCE_PERFORMANCE,
689 EPP_INDEX_BALANCE_POWERSAVE,
690 EPP_INDEX_POWERSAVE,
691};
692
693static const char * const energy_perf_strings[] = {
694 [EPP_INDEX_DEFAULT] = "default",
695 [EPP_INDEX_PERFORMANCE] = "performance",
696 [EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance",
697 [EPP_INDEX_BALANCE_POWERSAVE] = "balance_power",
698 [EPP_INDEX_POWERSAVE] = "power",
699 NULL
700};
701static unsigned int epp_values[] = {
702 [EPP_INDEX_DEFAULT] = 0, /* Unused index */
703 [EPP_INDEX_PERFORMANCE] = HWP_EPP_PERFORMANCE,
704 [EPP_INDEX_BALANCE_PERFORMANCE] = HWP_EPP_BALANCE_PERFORMANCE,
705 [EPP_INDEX_BALANCE_POWERSAVE] = HWP_EPP_BALANCE_POWERSAVE,
706 [EPP_INDEX_POWERSAVE] = HWP_EPP_POWERSAVE,
707};
708
709static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data, int *raw_epp)
710{
711 s16 epp;
712 int index = -EINVAL;
713
714 *raw_epp = 0;
715 epp = intel_pstate_get_epp(cpu_data, 0);
716 if (epp < 0)
717 return epp;
718
719 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
720 if (epp == epp_values[EPP_INDEX_PERFORMANCE])
721 return EPP_INDEX_PERFORMANCE;
722 if (epp == epp_values[EPP_INDEX_BALANCE_PERFORMANCE])
723 return EPP_INDEX_BALANCE_PERFORMANCE;
724 if (epp == epp_values[EPP_INDEX_BALANCE_POWERSAVE])
725 return EPP_INDEX_BALANCE_POWERSAVE;
726 if (epp == epp_values[EPP_INDEX_POWERSAVE])
727 return EPP_INDEX_POWERSAVE;
728 *raw_epp = epp;
729 return 0;
730 } else if (boot_cpu_has(X86_FEATURE_EPB)) {
731 /*
732 * Range:
733 * 0x00-0x03 : Performance
734 * 0x04-0x07 : Balance performance
735 * 0x08-0x0B : Balance power
736 * 0x0C-0x0F : Power
737 * The EPB is a 4 bit value, but our ranges restrict the
738 * value which can be set. Here only using top two bits
739 * effectively.
740 */
741 index = (epp >> 2) + 1;
742 }
743
744 return index;
745}
746
747static int intel_pstate_set_epp(struct cpudata *cpu, u32 epp)
748{
749 int ret;
750
751 /*
752 * Use the cached HWP Request MSR value, because in the active mode the
753 * register itself may be updated by intel_pstate_hwp_boost_up() or
754 * intel_pstate_hwp_boost_down() at any time.
755 */
756 u64 value = READ_ONCE(cpu->hwp_req_cached);
757
758 value &= ~GENMASK_ULL(31, 24);
759 value |= (u64)epp << 24;
760 /*
761 * The only other updater of hwp_req_cached in the active mode,
762 * intel_pstate_hwp_set(), is called under the same lock as this
763 * function, so it cannot run in parallel with the update below.
764 */
765 WRITE_ONCE(cpu->hwp_req_cached, value);
766 ret = wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
767 if (!ret)
768 cpu->epp_cached = epp;
769
770 return ret;
771}
772
773static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
774 int pref_index, bool use_raw,
775 u32 raw_epp)
776{
777 int epp = -EINVAL;
778 int ret;
779
780 if (!pref_index)
781 epp = cpu_data->epp_default;
782
783 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
784 if (use_raw)
785 epp = raw_epp;
786 else if (epp == -EINVAL)
787 epp = epp_values[pref_index];
788
789 /*
790 * To avoid confusion, refuse to set EPP to any values different
791 * from 0 (performance) if the current policy is "performance",
792 * because those values would be overridden.
793 */
794 if (epp > 0 && cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
795 return -EBUSY;
796
797 ret = intel_pstate_set_epp(cpu_data, epp);
798 } else {
799 if (epp == -EINVAL)
800 epp = (pref_index - 1) << 2;
801 ret = intel_pstate_set_epb(cpu_data->cpu, epp);
802 }
803
804 return ret;
805}
806
807static ssize_t show_energy_performance_available_preferences(
808 struct cpufreq_policy *policy, char *buf)
809{
810 int i = 0;
811 int ret = 0;
812
813 while (energy_perf_strings[i] != NULL)
814 ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
815
816 ret += sprintf(&buf[ret], "\n");
817
818 return ret;
819}
820
821cpufreq_freq_attr_ro(energy_performance_available_preferences);
822
823static struct cpufreq_driver intel_pstate;
824
825static ssize_t store_energy_performance_preference(
826 struct cpufreq_policy *policy, const char *buf, size_t count)
827{
828 struct cpudata *cpu = all_cpu_data[policy->cpu];
829 char str_preference[21];
830 bool raw = false;
831 ssize_t ret;
832 u32 epp = 0;
833
834 ret = sscanf(buf, "%20s", str_preference);
835 if (ret != 1)
836 return -EINVAL;
837
838 ret = match_string(energy_perf_strings, -1, str_preference);
839 if (ret < 0) {
840 if (!boot_cpu_has(X86_FEATURE_HWP_EPP))
841 return ret;
842
843 ret = kstrtouint(buf, 10, &epp);
844 if (ret)
845 return ret;
846
847 if (epp > 255)
848 return -EINVAL;
849
850 raw = true;
851 }
852
853 /*
854 * This function runs with the policy R/W semaphore held, which
855 * guarantees that the driver pointer will not change while it is
856 * running.
857 */
858 if (!intel_pstate_driver)
859 return -EAGAIN;
860
861 mutex_lock(&intel_pstate_limits_lock);
862
863 if (intel_pstate_driver == &intel_pstate) {
864 ret = intel_pstate_set_energy_pref_index(cpu, ret, raw, epp);
865 } else {
866 /*
867 * In the passive mode the governor needs to be stopped on the
868 * target CPU before the EPP update and restarted after it,
869 * which is super-heavy-weight, so make sure it is worth doing
870 * upfront.
871 */
872 if (!raw)
873 epp = ret ? epp_values[ret] : cpu->epp_default;
874
875 if (cpu->epp_cached != epp) {
876 int err;
877
878 cpufreq_stop_governor(policy);
879 ret = intel_pstate_set_epp(cpu, epp);
880 err = cpufreq_start_governor(policy);
881 if (!ret)
882 ret = err;
883 } else {
884 ret = 0;
885 }
886 }
887
888 mutex_unlock(&intel_pstate_limits_lock);
889
890 return ret ?: count;
891}
892
893static ssize_t show_energy_performance_preference(
894 struct cpufreq_policy *policy, char *buf)
895{
896 struct cpudata *cpu_data = all_cpu_data[policy->cpu];
897 int preference, raw_epp;
898
899 preference = intel_pstate_get_energy_pref_index(cpu_data, &raw_epp);
900 if (preference < 0)
901 return preference;
902
903 if (raw_epp)
904 return sprintf(buf, "%d\n", raw_epp);
905 else
906 return sprintf(buf, "%s\n", energy_perf_strings[preference]);
907}
908
909cpufreq_freq_attr_rw(energy_performance_preference);
910
911static ssize_t show_base_frequency(struct cpufreq_policy *policy, char *buf)
912{
913 struct cpudata *cpu = all_cpu_data[policy->cpu];
914 int ratio, freq;
915
916 ratio = intel_pstate_get_cppc_guaranteed(policy->cpu);
917 if (ratio <= 0) {
918 u64 cap;
919
920 rdmsrl_on_cpu(policy->cpu, MSR_HWP_CAPABILITIES, &cap);
921 ratio = HWP_GUARANTEED_PERF(cap);
922 }
923
924 freq = ratio * cpu->pstate.scaling;
925 if (cpu->pstate.scaling != cpu->pstate.perf_ctl_scaling)
926 freq = rounddown(freq, cpu->pstate.perf_ctl_scaling);
927
928 return sprintf(buf, "%d\n", freq);
929}
930
931cpufreq_freq_attr_ro(base_frequency);
932
933static struct freq_attr *hwp_cpufreq_attrs[] = {
934 &energy_performance_preference,
935 &energy_performance_available_preferences,
936 &base_frequency,
937 NULL,
938};
939
940static void __intel_pstate_get_hwp_cap(struct cpudata *cpu)
941{
942 u64 cap;
943
944 rdmsrl_on_cpu(cpu->cpu, MSR_HWP_CAPABILITIES, &cap);
945 WRITE_ONCE(cpu->hwp_cap_cached, cap);
946 cpu->pstate.max_pstate = HWP_GUARANTEED_PERF(cap);
947 cpu->pstate.turbo_pstate = HWP_HIGHEST_PERF(cap);
948}
949
950static void intel_pstate_get_hwp_cap(struct cpudata *cpu)
951{
952 int scaling = cpu->pstate.scaling;
953
954 __intel_pstate_get_hwp_cap(cpu);
955
956 cpu->pstate.max_freq = cpu->pstate.max_pstate * scaling;
957 cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * scaling;
958 if (scaling != cpu->pstate.perf_ctl_scaling) {
959 int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
960
961 cpu->pstate.max_freq = rounddown(cpu->pstate.max_freq,
962 perf_ctl_scaling);
963 cpu->pstate.turbo_freq = rounddown(cpu->pstate.turbo_freq,
964 perf_ctl_scaling);
965 }
966}
967
968static void intel_pstate_hwp_set(unsigned int cpu)
969{
970 struct cpudata *cpu_data = all_cpu_data[cpu];
971 int max, min;
972 u64 value;
973 s16 epp;
974
975 max = cpu_data->max_perf_ratio;
976 min = cpu_data->min_perf_ratio;
977
978 if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
979 min = max;
980
981 rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
982
983 value &= ~HWP_MIN_PERF(~0L);
984 value |= HWP_MIN_PERF(min);
985
986 value &= ~HWP_MAX_PERF(~0L);
987 value |= HWP_MAX_PERF(max);
988
989 if (cpu_data->epp_policy == cpu_data->policy)
990 goto skip_epp;
991
992 cpu_data->epp_policy = cpu_data->policy;
993
994 if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) {
995 epp = intel_pstate_get_epp(cpu_data, value);
996 cpu_data->epp_powersave = epp;
997 /* If EPP read was failed, then don't try to write */
998 if (epp < 0)
999 goto skip_epp;
1000
1001 epp = 0;
1002 } else {
1003 /* skip setting EPP, when saved value is invalid */
1004 if (cpu_data->epp_powersave < 0)
1005 goto skip_epp;
1006
1007 /*
1008 * No need to restore EPP when it is not zero. This
1009 * means:
1010 * - Policy is not changed
1011 * - user has manually changed
1012 * - Error reading EPB
1013 */
1014 epp = intel_pstate_get_epp(cpu_data, value);
1015 if (epp)
1016 goto skip_epp;
1017
1018 epp = cpu_data->epp_powersave;
1019 }
1020 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
1021 value &= ~GENMASK_ULL(31, 24);
1022 value |= (u64)epp << 24;
1023 } else {
1024 intel_pstate_set_epb(cpu, epp);
1025 }
1026skip_epp:
1027 WRITE_ONCE(cpu_data->hwp_req_cached, value);
1028 wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
1029}
1030
1031static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata);
1032
1033static void intel_pstate_hwp_offline(struct cpudata *cpu)
1034{
1035 u64 value = READ_ONCE(cpu->hwp_req_cached);
1036 int min_perf;
1037
1038 intel_pstate_disable_hwp_interrupt(cpu);
1039
1040 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
1041 /*
1042 * In case the EPP has been set to "performance" by the
1043 * active mode "performance" scaling algorithm, replace that
1044 * temporary value with the cached EPP one.
1045 */
1046 value &= ~GENMASK_ULL(31, 24);
1047 value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
1048 /*
1049 * However, make sure that EPP will be set to "performance" when
1050 * the CPU is brought back online again and the "performance"
1051 * scaling algorithm is still in effect.
1052 */
1053 cpu->epp_policy = CPUFREQ_POLICY_UNKNOWN;
1054 }
1055
1056 /*
1057 * Clear the desired perf field in the cached HWP request value to
1058 * prevent nonzero desired values from being leaked into the active
1059 * mode.
1060 */
1061 value &= ~HWP_DESIRED_PERF(~0L);
1062 WRITE_ONCE(cpu->hwp_req_cached, value);
1063
1064 value &= ~GENMASK_ULL(31, 0);
1065 min_perf = HWP_LOWEST_PERF(READ_ONCE(cpu->hwp_cap_cached));
1066
1067 /* Set hwp_max = hwp_min */
1068 value |= HWP_MAX_PERF(min_perf);
1069 value |= HWP_MIN_PERF(min_perf);
1070
1071 /* Set EPP to min */
1072 if (boot_cpu_has(X86_FEATURE_HWP_EPP))
1073 value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
1074
1075 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
1076}
1077
1078#define POWER_CTL_EE_ENABLE 1
1079#define POWER_CTL_EE_DISABLE 2
1080
1081static int power_ctl_ee_state;
1082
1083static void set_power_ctl_ee_state(bool input)
1084{
1085 u64 power_ctl;
1086
1087 mutex_lock(&intel_pstate_driver_lock);
1088 rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
1089 if (input) {
1090 power_ctl &= ~BIT(MSR_IA32_POWER_CTL_BIT_EE);
1091 power_ctl_ee_state = POWER_CTL_EE_ENABLE;
1092 } else {
1093 power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
1094 power_ctl_ee_state = POWER_CTL_EE_DISABLE;
1095 }
1096 wrmsrl(MSR_IA32_POWER_CTL, power_ctl);
1097 mutex_unlock(&intel_pstate_driver_lock);
1098}
1099
1100static void intel_pstate_hwp_enable(struct cpudata *cpudata);
1101
1102static void intel_pstate_hwp_reenable(struct cpudata *cpu)
1103{
1104 intel_pstate_hwp_enable(cpu);
1105 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, READ_ONCE(cpu->hwp_req_cached));
1106}
1107
1108static int intel_pstate_suspend(struct cpufreq_policy *policy)
1109{
1110 struct cpudata *cpu = all_cpu_data[policy->cpu];
1111
1112 pr_debug("CPU %d suspending\n", cpu->cpu);
1113
1114 cpu->suspended = true;
1115
1116 /* disable HWP interrupt and cancel any pending work */
1117 intel_pstate_disable_hwp_interrupt(cpu);
1118
1119 return 0;
1120}
1121
1122static int intel_pstate_resume(struct cpufreq_policy *policy)
1123{
1124 struct cpudata *cpu = all_cpu_data[policy->cpu];
1125
1126 pr_debug("CPU %d resuming\n", cpu->cpu);
1127
1128 /* Only restore if the system default is changed */
1129 if (power_ctl_ee_state == POWER_CTL_EE_ENABLE)
1130 set_power_ctl_ee_state(true);
1131 else if (power_ctl_ee_state == POWER_CTL_EE_DISABLE)
1132 set_power_ctl_ee_state(false);
1133
1134 if (cpu->suspended && hwp_active) {
1135 mutex_lock(&intel_pstate_limits_lock);
1136
1137 /* Re-enable HWP, because "online" has not done that. */
1138 intel_pstate_hwp_reenable(cpu);
1139
1140 mutex_unlock(&intel_pstate_limits_lock);
1141 }
1142
1143 cpu->suspended = false;
1144
1145 return 0;
1146}
1147
1148static void intel_pstate_update_policies(void)
1149{
1150 int cpu;
1151
1152 for_each_possible_cpu(cpu)
1153 cpufreq_update_policy(cpu);
1154}
1155
1156static void __intel_pstate_update_max_freq(struct cpudata *cpudata,
1157 struct cpufreq_policy *policy)
1158{
1159 policy->cpuinfo.max_freq = global.turbo_disabled_mf ?
1160 cpudata->pstate.max_freq : cpudata->pstate.turbo_freq;
1161 refresh_frequency_limits(policy);
1162}
1163
1164static void intel_pstate_update_max_freq(unsigned int cpu)
1165{
1166 struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
1167
1168 if (!policy)
1169 return;
1170
1171 __intel_pstate_update_max_freq(all_cpu_data[cpu], policy);
1172
1173 cpufreq_cpu_release(policy);
1174}
1175
1176static void intel_pstate_update_limits(unsigned int cpu)
1177{
1178 mutex_lock(&intel_pstate_driver_lock);
1179
1180 update_turbo_state();
1181 /*
1182 * If turbo has been turned on or off globally, policy limits for
1183 * all CPUs need to be updated to reflect that.
1184 */
1185 if (global.turbo_disabled_mf != global.turbo_disabled) {
1186 global.turbo_disabled_mf = global.turbo_disabled;
1187 arch_set_max_freq_ratio(global.turbo_disabled);
1188 for_each_possible_cpu(cpu)
1189 intel_pstate_update_max_freq(cpu);
1190 } else {
1191 cpufreq_update_policy(cpu);
1192 }
1193
1194 mutex_unlock(&intel_pstate_driver_lock);
1195}
1196
1197/************************** sysfs begin ************************/
1198#define show_one(file_name, object) \
1199 static ssize_t show_##file_name \
1200 (struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
1201 { \
1202 return sprintf(buf, "%u\n", global.object); \
1203 }
1204
1205static ssize_t intel_pstate_show_status(char *buf);
1206static int intel_pstate_update_status(const char *buf, size_t size);
1207
1208static ssize_t show_status(struct kobject *kobj,
1209 struct kobj_attribute *attr, char *buf)
1210{
1211 ssize_t ret;
1212
1213 mutex_lock(&intel_pstate_driver_lock);
1214 ret = intel_pstate_show_status(buf);
1215 mutex_unlock(&intel_pstate_driver_lock);
1216
1217 return ret;
1218}
1219
1220static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
1221 const char *buf, size_t count)
1222{
1223 char *p = memchr(buf, '\n', count);
1224 int ret;
1225
1226 mutex_lock(&intel_pstate_driver_lock);
1227 ret = intel_pstate_update_status(buf, p ? p - buf : count);
1228 mutex_unlock(&intel_pstate_driver_lock);
1229
1230 return ret < 0 ? ret : count;
1231}
1232
1233static ssize_t show_turbo_pct(struct kobject *kobj,
1234 struct kobj_attribute *attr, char *buf)
1235{
1236 struct cpudata *cpu;
1237 int total, no_turbo, turbo_pct;
1238 uint32_t turbo_fp;
1239
1240 mutex_lock(&intel_pstate_driver_lock);
1241
1242 if (!intel_pstate_driver) {
1243 mutex_unlock(&intel_pstate_driver_lock);
1244 return -EAGAIN;
1245 }
1246
1247 cpu = all_cpu_data[0];
1248
1249 total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1250 no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
1251 turbo_fp = div_fp(no_turbo, total);
1252 turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
1253
1254 mutex_unlock(&intel_pstate_driver_lock);
1255
1256 return sprintf(buf, "%u\n", turbo_pct);
1257}
1258
1259static ssize_t show_num_pstates(struct kobject *kobj,
1260 struct kobj_attribute *attr, char *buf)
1261{
1262 struct cpudata *cpu;
1263 int total;
1264
1265 mutex_lock(&intel_pstate_driver_lock);
1266
1267 if (!intel_pstate_driver) {
1268 mutex_unlock(&intel_pstate_driver_lock);
1269 return -EAGAIN;
1270 }
1271
1272 cpu = all_cpu_data[0];
1273 total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1274
1275 mutex_unlock(&intel_pstate_driver_lock);
1276
1277 return sprintf(buf, "%u\n", total);
1278}
1279
1280static ssize_t show_no_turbo(struct kobject *kobj,
1281 struct kobj_attribute *attr, char *buf)
1282{
1283 ssize_t ret;
1284
1285 mutex_lock(&intel_pstate_driver_lock);
1286
1287 if (!intel_pstate_driver) {
1288 mutex_unlock(&intel_pstate_driver_lock);
1289 return -EAGAIN;
1290 }
1291
1292 update_turbo_state();
1293 if (global.turbo_disabled)
1294 ret = sprintf(buf, "%u\n", global.turbo_disabled);
1295 else
1296 ret = sprintf(buf, "%u\n", global.no_turbo);
1297
1298 mutex_unlock(&intel_pstate_driver_lock);
1299
1300 return ret;
1301}
1302
1303static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
1304 const char *buf, size_t count)
1305{
1306 unsigned int input;
1307 int ret;
1308
1309 ret = sscanf(buf, "%u", &input);
1310 if (ret != 1)
1311 return -EINVAL;
1312
1313 mutex_lock(&intel_pstate_driver_lock);
1314
1315 if (!intel_pstate_driver) {
1316 mutex_unlock(&intel_pstate_driver_lock);
1317 return -EAGAIN;
1318 }
1319
1320 mutex_lock(&intel_pstate_limits_lock);
1321
1322 update_turbo_state();
1323 if (global.turbo_disabled) {
1324 pr_notice_once("Turbo disabled by BIOS or unavailable on processor\n");
1325 mutex_unlock(&intel_pstate_limits_lock);
1326 mutex_unlock(&intel_pstate_driver_lock);
1327 return -EPERM;
1328 }
1329
1330 global.no_turbo = clamp_t(int, input, 0, 1);
1331
1332 if (global.no_turbo) {
1333 struct cpudata *cpu = all_cpu_data[0];
1334 int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate;
1335
1336 /* Squash the global minimum into the permitted range. */
1337 if (global.min_perf_pct > pct)
1338 global.min_perf_pct = pct;
1339 }
1340
1341 mutex_unlock(&intel_pstate_limits_lock);
1342
1343 intel_pstate_update_policies();
1344 arch_set_max_freq_ratio(global.no_turbo);
1345
1346 mutex_unlock(&intel_pstate_driver_lock);
1347
1348 return count;
1349}
1350
1351static void update_qos_request(enum freq_qos_req_type type)
1352{
1353 struct freq_qos_request *req;
1354 struct cpufreq_policy *policy;
1355 int i;
1356
1357 for_each_possible_cpu(i) {
1358 struct cpudata *cpu = all_cpu_data[i];
1359 unsigned int freq, perf_pct;
1360
1361 policy = cpufreq_cpu_get(i);
1362 if (!policy)
1363 continue;
1364
1365 req = policy->driver_data;
1366 cpufreq_cpu_put(policy);
1367
1368 if (!req)
1369 continue;
1370
1371 if (hwp_active)
1372 intel_pstate_get_hwp_cap(cpu);
1373
1374 if (type == FREQ_QOS_MIN) {
1375 perf_pct = global.min_perf_pct;
1376 } else {
1377 req++;
1378 perf_pct = global.max_perf_pct;
1379 }
1380
1381 freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * perf_pct, 100);
1382
1383 if (freq_qos_update_request(req, freq) < 0)
1384 pr_warn("Failed to update freq constraint: CPU%d\n", i);
1385 }
1386}
1387
1388static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
1389 const char *buf, size_t count)
1390{
1391 unsigned int input;
1392 int ret;
1393
1394 ret = sscanf(buf, "%u", &input);
1395 if (ret != 1)
1396 return -EINVAL;
1397
1398 mutex_lock(&intel_pstate_driver_lock);
1399
1400 if (!intel_pstate_driver) {
1401 mutex_unlock(&intel_pstate_driver_lock);
1402 return -EAGAIN;
1403 }
1404
1405 mutex_lock(&intel_pstate_limits_lock);
1406
1407 global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100);
1408
1409 mutex_unlock(&intel_pstate_limits_lock);
1410
1411 if (intel_pstate_driver == &intel_pstate)
1412 intel_pstate_update_policies();
1413 else
1414 update_qos_request(FREQ_QOS_MAX);
1415
1416 mutex_unlock(&intel_pstate_driver_lock);
1417
1418 return count;
1419}
1420
1421static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b,
1422 const char *buf, size_t count)
1423{
1424 unsigned int input;
1425 int ret;
1426
1427 ret = sscanf(buf, "%u", &input);
1428 if (ret != 1)
1429 return -EINVAL;
1430
1431 mutex_lock(&intel_pstate_driver_lock);
1432
1433 if (!intel_pstate_driver) {
1434 mutex_unlock(&intel_pstate_driver_lock);
1435 return -EAGAIN;
1436 }
1437
1438 mutex_lock(&intel_pstate_limits_lock);
1439
1440 global.min_perf_pct = clamp_t(int, input,
1441 min_perf_pct_min(), global.max_perf_pct);
1442
1443 mutex_unlock(&intel_pstate_limits_lock);
1444
1445 if (intel_pstate_driver == &intel_pstate)
1446 intel_pstate_update_policies();
1447 else
1448 update_qos_request(FREQ_QOS_MIN);
1449
1450 mutex_unlock(&intel_pstate_driver_lock);
1451
1452 return count;
1453}
1454
1455static ssize_t show_hwp_dynamic_boost(struct kobject *kobj,
1456 struct kobj_attribute *attr, char *buf)
1457{
1458 return sprintf(buf, "%u\n", hwp_boost);
1459}
1460
1461static ssize_t store_hwp_dynamic_boost(struct kobject *a,
1462 struct kobj_attribute *b,
1463 const char *buf, size_t count)
1464{
1465 unsigned int input;
1466 int ret;
1467
1468 ret = kstrtouint(buf, 10, &input);
1469 if (ret)
1470 return ret;
1471
1472 mutex_lock(&intel_pstate_driver_lock);
1473 hwp_boost = !!input;
1474 intel_pstate_update_policies();
1475 mutex_unlock(&intel_pstate_driver_lock);
1476
1477 return count;
1478}
1479
1480static ssize_t show_energy_efficiency(struct kobject *kobj, struct kobj_attribute *attr,
1481 char *buf)
1482{
1483 u64 power_ctl;
1484 int enable;
1485
1486 rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
1487 enable = !!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE));
1488 return sprintf(buf, "%d\n", !enable);
1489}
1490
1491static ssize_t store_energy_efficiency(struct kobject *a, struct kobj_attribute *b,
1492 const char *buf, size_t count)
1493{
1494 bool input;
1495 int ret;
1496
1497 ret = kstrtobool(buf, &input);
1498 if (ret)
1499 return ret;
1500
1501 set_power_ctl_ee_state(input);
1502
1503 return count;
1504}
1505
1506show_one(max_perf_pct, max_perf_pct);
1507show_one(min_perf_pct, min_perf_pct);
1508
1509define_one_global_rw(status);
1510define_one_global_rw(no_turbo);
1511define_one_global_rw(max_perf_pct);
1512define_one_global_rw(min_perf_pct);
1513define_one_global_ro(turbo_pct);
1514define_one_global_ro(num_pstates);
1515define_one_global_rw(hwp_dynamic_boost);
1516define_one_global_rw(energy_efficiency);
1517
1518static struct attribute *intel_pstate_attributes[] = {
1519 &status.attr,
1520 &no_turbo.attr,
1521 NULL
1522};
1523
1524static const struct attribute_group intel_pstate_attr_group = {
1525 .attrs = intel_pstate_attributes,
1526};
1527
1528static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[];
1529
1530static struct kobject *intel_pstate_kobject;
1531
1532static void __init intel_pstate_sysfs_expose_params(void)
1533{
1534 struct device *dev_root = bus_get_dev_root(&cpu_subsys);
1535 int rc;
1536
1537 if (dev_root) {
1538 intel_pstate_kobject = kobject_create_and_add("intel_pstate", &dev_root->kobj);
1539 put_device(dev_root);
1540 }
1541 if (WARN_ON(!intel_pstate_kobject))
1542 return;
1543
1544 rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
1545 if (WARN_ON(rc))
1546 return;
1547
1548 if (!boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
1549 rc = sysfs_create_file(intel_pstate_kobject, &turbo_pct.attr);
1550 WARN_ON(rc);
1551
1552 rc = sysfs_create_file(intel_pstate_kobject, &num_pstates.attr);
1553 WARN_ON(rc);
1554 }
1555
1556 /*
1557 * If per cpu limits are enforced there are no global limits, so
1558 * return without creating max/min_perf_pct attributes
1559 */
1560 if (per_cpu_limits)
1561 return;
1562
1563 rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr);
1564 WARN_ON(rc);
1565
1566 rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
1567 WARN_ON(rc);
1568
1569 if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids)) {
1570 rc = sysfs_create_file(intel_pstate_kobject, &energy_efficiency.attr);
1571 WARN_ON(rc);
1572 }
1573}
1574
1575static void __init intel_pstate_sysfs_remove(void)
1576{
1577 if (!intel_pstate_kobject)
1578 return;
1579
1580 sysfs_remove_group(intel_pstate_kobject, &intel_pstate_attr_group);
1581
1582 if (!boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
1583 sysfs_remove_file(intel_pstate_kobject, &num_pstates.attr);
1584 sysfs_remove_file(intel_pstate_kobject, &turbo_pct.attr);
1585 }
1586
1587 if (!per_cpu_limits) {
1588 sysfs_remove_file(intel_pstate_kobject, &max_perf_pct.attr);
1589 sysfs_remove_file(intel_pstate_kobject, &min_perf_pct.attr);
1590
1591 if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids))
1592 sysfs_remove_file(intel_pstate_kobject, &energy_efficiency.attr);
1593 }
1594
1595 kobject_put(intel_pstate_kobject);
1596}
1597
1598static void intel_pstate_sysfs_expose_hwp_dynamic_boost(void)
1599{
1600 int rc;
1601
1602 if (!hwp_active)
1603 return;
1604
1605 rc = sysfs_create_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1606 WARN_ON_ONCE(rc);
1607}
1608
1609static void intel_pstate_sysfs_hide_hwp_dynamic_boost(void)
1610{
1611 if (!hwp_active)
1612 return;
1613
1614 sysfs_remove_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1615}
1616
1617/************************** sysfs end ************************/
1618
1619static void intel_pstate_notify_work(struct work_struct *work)
1620{
1621 struct cpudata *cpudata =
1622 container_of(to_delayed_work(work), struct cpudata, hwp_notify_work);
1623 struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpudata->cpu);
1624
1625 if (policy) {
1626 intel_pstate_get_hwp_cap(cpudata);
1627 __intel_pstate_update_max_freq(cpudata, policy);
1628
1629 cpufreq_cpu_release(policy);
1630 }
1631
1632 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
1633}
1634
1635static DEFINE_SPINLOCK(hwp_notify_lock);
1636static cpumask_t hwp_intr_enable_mask;
1637
1638void notify_hwp_interrupt(void)
1639{
1640 unsigned int this_cpu = smp_processor_id();
1641 struct cpudata *cpudata;
1642 unsigned long flags;
1643 u64 value;
1644
1645 if (!READ_ONCE(hwp_active) || !boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1646 return;
1647
1648 rdmsrl_safe(MSR_HWP_STATUS, &value);
1649 if (!(value & 0x01))
1650 return;
1651
1652 spin_lock_irqsave(&hwp_notify_lock, flags);
1653
1654 if (!cpumask_test_cpu(this_cpu, &hwp_intr_enable_mask))
1655 goto ack_intr;
1656
1657 /*
1658 * Currently we never free all_cpu_data. And we can't reach here
1659 * without this allocated. But for safety for future changes, added
1660 * check.
1661 */
1662 if (unlikely(!READ_ONCE(all_cpu_data)))
1663 goto ack_intr;
1664
1665 /*
1666 * The free is done during cleanup, when cpufreq registry is failed.
1667 * We wouldn't be here if it fails on init or switch status. But for
1668 * future changes, added check.
1669 */
1670 cpudata = READ_ONCE(all_cpu_data[this_cpu]);
1671 if (unlikely(!cpudata))
1672 goto ack_intr;
1673
1674 schedule_delayed_work(&cpudata->hwp_notify_work, msecs_to_jiffies(10));
1675
1676 spin_unlock_irqrestore(&hwp_notify_lock, flags);
1677
1678 return;
1679
1680ack_intr:
1681 wrmsrl_safe(MSR_HWP_STATUS, 0);
1682 spin_unlock_irqrestore(&hwp_notify_lock, flags);
1683}
1684
1685static void intel_pstate_disable_hwp_interrupt(struct cpudata *cpudata)
1686{
1687 unsigned long flags;
1688
1689 if (!boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1690 return;
1691
1692 /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
1693 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1694
1695 spin_lock_irqsave(&hwp_notify_lock, flags);
1696 if (cpumask_test_and_clear_cpu(cpudata->cpu, &hwp_intr_enable_mask))
1697 cancel_delayed_work(&cpudata->hwp_notify_work);
1698 spin_unlock_irqrestore(&hwp_notify_lock, flags);
1699}
1700
1701static void intel_pstate_enable_hwp_interrupt(struct cpudata *cpudata)
1702{
1703 /* Enable HWP notification interrupt for guaranteed performance change */
1704 if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY)) {
1705 unsigned long flags;
1706
1707 spin_lock_irqsave(&hwp_notify_lock, flags);
1708 INIT_DELAYED_WORK(&cpudata->hwp_notify_work, intel_pstate_notify_work);
1709 cpumask_set_cpu(cpudata->cpu, &hwp_intr_enable_mask);
1710 spin_unlock_irqrestore(&hwp_notify_lock, flags);
1711
1712 /* wrmsrl_on_cpu has to be outside spinlock as this can result in IPC */
1713 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x01);
1714 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_STATUS, 0);
1715 }
1716}
1717
1718static void intel_pstate_update_epp_defaults(struct cpudata *cpudata)
1719{
1720 cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
1721
1722 /*
1723 * If the EPP is set by firmware, which means that firmware enabled HWP
1724 * - Is equal or less than 0x80 (default balance_perf EPP)
1725 * - But less performance oriented than performance EPP
1726 * then use this as new balance_perf EPP.
1727 */
1728 if (hwp_forced && cpudata->epp_default <= HWP_EPP_BALANCE_PERFORMANCE &&
1729 cpudata->epp_default > HWP_EPP_PERFORMANCE) {
1730 epp_values[EPP_INDEX_BALANCE_PERFORMANCE] = cpudata->epp_default;
1731 return;
1732 }
1733
1734 /*
1735 * If this CPU gen doesn't call for change in balance_perf
1736 * EPP return.
1737 */
1738 if (epp_values[EPP_INDEX_BALANCE_PERFORMANCE] == HWP_EPP_BALANCE_PERFORMANCE)
1739 return;
1740
1741 /*
1742 * Use hard coded value per gen to update the balance_perf
1743 * and default EPP.
1744 */
1745 cpudata->epp_default = epp_values[EPP_INDEX_BALANCE_PERFORMANCE];
1746 intel_pstate_set_epp(cpudata, cpudata->epp_default);
1747}
1748
1749static void intel_pstate_hwp_enable(struct cpudata *cpudata)
1750{
1751 /* First disable HWP notification interrupt till we activate again */
1752 if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1753 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1754
1755 wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
1756
1757 intel_pstate_enable_hwp_interrupt(cpudata);
1758
1759 if (cpudata->epp_default >= 0)
1760 return;
1761
1762 intel_pstate_update_epp_defaults(cpudata);
1763}
1764
1765static int atom_get_min_pstate(int not_used)
1766{
1767 u64 value;
1768
1769 rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1770 return (value >> 8) & 0x7F;
1771}
1772
1773static int atom_get_max_pstate(int not_used)
1774{
1775 u64 value;
1776
1777 rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1778 return (value >> 16) & 0x7F;
1779}
1780
1781static int atom_get_turbo_pstate(int not_used)
1782{
1783 u64 value;
1784
1785 rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value);
1786 return value & 0x7F;
1787}
1788
1789static u64 atom_get_val(struct cpudata *cpudata, int pstate)
1790{
1791 u64 val;
1792 int32_t vid_fp;
1793 u32 vid;
1794
1795 val = (u64)pstate << 8;
1796 if (global.no_turbo && !global.turbo_disabled)
1797 val |= (u64)1 << 32;
1798
1799 vid_fp = cpudata->vid.min + mul_fp(
1800 int_tofp(pstate - cpudata->pstate.min_pstate),
1801 cpudata->vid.ratio);
1802
1803 vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
1804 vid = ceiling_fp(vid_fp);
1805
1806 if (pstate > cpudata->pstate.max_pstate)
1807 vid = cpudata->vid.turbo;
1808
1809 return val | vid;
1810}
1811
1812static int silvermont_get_scaling(void)
1813{
1814 u64 value;
1815 int i;
1816 /* Defined in Table 35-6 from SDM (Sept 2015) */
1817 static int silvermont_freq_table[] = {
1818 83300, 100000, 133300, 116700, 80000};
1819
1820 rdmsrl(MSR_FSB_FREQ, value);
1821 i = value & 0x7;
1822 WARN_ON(i > 4);
1823
1824 return silvermont_freq_table[i];
1825}
1826
1827static int airmont_get_scaling(void)
1828{
1829 u64 value;
1830 int i;
1831 /* Defined in Table 35-10 from SDM (Sept 2015) */
1832 static int airmont_freq_table[] = {
1833 83300, 100000, 133300, 116700, 80000,
1834 93300, 90000, 88900, 87500};
1835
1836 rdmsrl(MSR_FSB_FREQ, value);
1837 i = value & 0xF;
1838 WARN_ON(i > 8);
1839
1840 return airmont_freq_table[i];
1841}
1842
1843static void atom_get_vid(struct cpudata *cpudata)
1844{
1845 u64 value;
1846
1847 rdmsrl(MSR_ATOM_CORE_VIDS, value);
1848 cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
1849 cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
1850 cpudata->vid.ratio = div_fp(
1851 cpudata->vid.max - cpudata->vid.min,
1852 int_tofp(cpudata->pstate.max_pstate -
1853 cpudata->pstate.min_pstate));
1854
1855 rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value);
1856 cpudata->vid.turbo = value & 0x7f;
1857}
1858
1859static int core_get_min_pstate(int cpu)
1860{
1861 u64 value;
1862
1863 rdmsrl_on_cpu(cpu, MSR_PLATFORM_INFO, &value);
1864 return (value >> 40) & 0xFF;
1865}
1866
1867static int core_get_max_pstate_physical(int cpu)
1868{
1869 u64 value;
1870
1871 rdmsrl_on_cpu(cpu, MSR_PLATFORM_INFO, &value);
1872 return (value >> 8) & 0xFF;
1873}
1874
1875static int core_get_tdp_ratio(int cpu, u64 plat_info)
1876{
1877 /* Check how many TDP levels present */
1878 if (plat_info & 0x600000000) {
1879 u64 tdp_ctrl;
1880 u64 tdp_ratio;
1881 int tdp_msr;
1882 int err;
1883
1884 /* Get the TDP level (0, 1, 2) to get ratios */
1885 err = rdmsrl_safe_on_cpu(cpu, MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
1886 if (err)
1887 return err;
1888
1889 /* TDP MSR are continuous starting at 0x648 */
1890 tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
1891 err = rdmsrl_safe_on_cpu(cpu, tdp_msr, &tdp_ratio);
1892 if (err)
1893 return err;
1894
1895 /* For level 1 and 2, bits[23:16] contain the ratio */
1896 if (tdp_ctrl & 0x03)
1897 tdp_ratio >>= 16;
1898
1899 tdp_ratio &= 0xff; /* ratios are only 8 bits long */
1900 pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
1901
1902 return (int)tdp_ratio;
1903 }
1904
1905 return -ENXIO;
1906}
1907
1908static int core_get_max_pstate(int cpu)
1909{
1910 u64 tar;
1911 u64 plat_info;
1912 int max_pstate;
1913 int tdp_ratio;
1914 int err;
1915
1916 rdmsrl_on_cpu(cpu, MSR_PLATFORM_INFO, &plat_info);
1917 max_pstate = (plat_info >> 8) & 0xFF;
1918
1919 tdp_ratio = core_get_tdp_ratio(cpu, plat_info);
1920 if (tdp_ratio <= 0)
1921 return max_pstate;
1922
1923 if (hwp_active) {
1924 /* Turbo activation ratio is not used on HWP platforms */
1925 return tdp_ratio;
1926 }
1927
1928 err = rdmsrl_safe_on_cpu(cpu, MSR_TURBO_ACTIVATION_RATIO, &tar);
1929 if (!err) {
1930 int tar_levels;
1931
1932 /* Do some sanity checking for safety */
1933 tar_levels = tar & 0xff;
1934 if (tdp_ratio - 1 == tar_levels) {
1935 max_pstate = tar_levels;
1936 pr_debug("max_pstate=TAC %x\n", max_pstate);
1937 }
1938 }
1939
1940 return max_pstate;
1941}
1942
1943static int core_get_turbo_pstate(int cpu)
1944{
1945 u64 value;
1946 int nont, ret;
1947
1948 rdmsrl_on_cpu(cpu, MSR_TURBO_RATIO_LIMIT, &value);
1949 nont = core_get_max_pstate(cpu);
1950 ret = (value) & 255;
1951 if (ret <= nont)
1952 ret = nont;
1953 return ret;
1954}
1955
1956static u64 core_get_val(struct cpudata *cpudata, int pstate)
1957{
1958 u64 val;
1959
1960 val = (u64)pstate << 8;
1961 if (global.no_turbo && !global.turbo_disabled)
1962 val |= (u64)1 << 32;
1963
1964 return val;
1965}
1966
1967static int knl_get_aperf_mperf_shift(void)
1968{
1969 return 10;
1970}
1971
1972static int knl_get_turbo_pstate(int cpu)
1973{
1974 u64 value;
1975 int nont, ret;
1976
1977 rdmsrl_on_cpu(cpu, MSR_TURBO_RATIO_LIMIT, &value);
1978 nont = core_get_max_pstate(cpu);
1979 ret = (((value) >> 8) & 0xFF);
1980 if (ret <= nont)
1981 ret = nont;
1982 return ret;
1983}
1984
1985static void hybrid_get_type(void *data)
1986{
1987 u8 *cpu_type = data;
1988
1989 *cpu_type = get_this_hybrid_cpu_type();
1990}
1991
1992static int hwp_get_cpu_scaling(int cpu)
1993{
1994 u8 cpu_type = 0;
1995
1996 smp_call_function_single(cpu, hybrid_get_type, &cpu_type, 1);
1997 /* P-cores have a smaller perf level-to-freqency scaling factor. */
1998 if (cpu_type == 0x40)
1999 return hybrid_scaling_factor;
2000
2001 /* Use default core scaling for E-cores */
2002 if (cpu_type == 0x20)
2003 return core_get_scaling();
2004
2005 /*
2006 * If reached here, this system is either non-hybrid (like Tiger
2007 * Lake) or hybrid-capable (like Alder Lake or Raptor Lake) with
2008 * no E cores (in which case CPUID for hybrid support is 0).
2009 *
2010 * The CPPC nominal_frequency field is 0 for non-hybrid systems,
2011 * so the default core scaling will be used for them.
2012 */
2013 return intel_pstate_cppc_get_scaling(cpu);
2014}
2015
2016static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
2017{
2018 trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
2019 cpu->pstate.current_pstate = pstate;
2020 /*
2021 * Generally, there is no guarantee that this code will always run on
2022 * the CPU being updated, so force the register update to run on the
2023 * right CPU.
2024 */
2025 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
2026 pstate_funcs.get_val(cpu, pstate));
2027}
2028
2029static void intel_pstate_set_min_pstate(struct cpudata *cpu)
2030{
2031 intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
2032}
2033
2034static void intel_pstate_max_within_limits(struct cpudata *cpu)
2035{
2036 int pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio);
2037
2038 update_turbo_state();
2039 intel_pstate_set_pstate(cpu, pstate);
2040}
2041
2042static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
2043{
2044 int perf_ctl_max_phys = pstate_funcs.get_max_physical(cpu->cpu);
2045 int perf_ctl_scaling = pstate_funcs.get_scaling();
2046
2047 cpu->pstate.min_pstate = pstate_funcs.get_min(cpu->cpu);
2048 cpu->pstate.max_pstate_physical = perf_ctl_max_phys;
2049 cpu->pstate.perf_ctl_scaling = perf_ctl_scaling;
2050
2051 if (hwp_active && !hwp_mode_bdw) {
2052 __intel_pstate_get_hwp_cap(cpu);
2053
2054 if (pstate_funcs.get_cpu_scaling) {
2055 cpu->pstate.scaling = pstate_funcs.get_cpu_scaling(cpu->cpu);
2056 if (cpu->pstate.scaling != perf_ctl_scaling)
2057 intel_pstate_hybrid_hwp_adjust(cpu);
2058 } else {
2059 cpu->pstate.scaling = perf_ctl_scaling;
2060 }
2061 } else {
2062 cpu->pstate.scaling = perf_ctl_scaling;
2063 cpu->pstate.max_pstate = pstate_funcs.get_max(cpu->cpu);
2064 cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(cpu->cpu);
2065 }
2066
2067 if (cpu->pstate.scaling == perf_ctl_scaling) {
2068 cpu->pstate.min_freq = cpu->pstate.min_pstate * perf_ctl_scaling;
2069 cpu->pstate.max_freq = cpu->pstate.max_pstate * perf_ctl_scaling;
2070 cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * perf_ctl_scaling;
2071 }
2072
2073 if (pstate_funcs.get_aperf_mperf_shift)
2074 cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();
2075
2076 if (pstate_funcs.get_vid)
2077 pstate_funcs.get_vid(cpu);
2078
2079 intel_pstate_set_min_pstate(cpu);
2080}
2081
2082/*
2083 * Long hold time will keep high perf limits for long time,
2084 * which negatively impacts perf/watt for some workloads,
2085 * like specpower. 3ms is based on experiements on some
2086 * workoads.
2087 */
2088static int hwp_boost_hold_time_ns = 3 * NSEC_PER_MSEC;
2089
2090static inline void intel_pstate_hwp_boost_up(struct cpudata *cpu)
2091{
2092 u64 hwp_req = READ_ONCE(cpu->hwp_req_cached);
2093 u64 hwp_cap = READ_ONCE(cpu->hwp_cap_cached);
2094 u32 max_limit = (hwp_req & 0xff00) >> 8;
2095 u32 min_limit = (hwp_req & 0xff);
2096 u32 boost_level1;
2097
2098 /*
2099 * Cases to consider (User changes via sysfs or boot time):
2100 * If, P0 (Turbo max) = P1 (Guaranteed max) = min:
2101 * No boost, return.
2102 * If, P0 (Turbo max) > P1 (Guaranteed max) = min:
2103 * Should result in one level boost only for P0.
2104 * If, P0 (Turbo max) = P1 (Guaranteed max) > min:
2105 * Should result in two level boost:
2106 * (min + p1)/2 and P1.
2107 * If, P0 (Turbo max) > P1 (Guaranteed max) > min:
2108 * Should result in three level boost:
2109 * (min + p1)/2, P1 and P0.
2110 */
2111
2112 /* If max and min are equal or already at max, nothing to boost */
2113 if (max_limit == min_limit || cpu->hwp_boost_min >= max_limit)
2114 return;
2115
2116 if (!cpu->hwp_boost_min)
2117 cpu->hwp_boost_min = min_limit;
2118
2119 /* level at half way mark between min and guranteed */
2120 boost_level1 = (HWP_GUARANTEED_PERF(hwp_cap) + min_limit) >> 1;
2121
2122 if (cpu->hwp_boost_min < boost_level1)
2123 cpu->hwp_boost_min = boost_level1;
2124 else if (cpu->hwp_boost_min < HWP_GUARANTEED_PERF(hwp_cap))
2125 cpu->hwp_boost_min = HWP_GUARANTEED_PERF(hwp_cap);
2126 else if (cpu->hwp_boost_min == HWP_GUARANTEED_PERF(hwp_cap) &&
2127 max_limit != HWP_GUARANTEED_PERF(hwp_cap))
2128 cpu->hwp_boost_min = max_limit;
2129 else
2130 return;
2131
2132 hwp_req = (hwp_req & ~GENMASK_ULL(7, 0)) | cpu->hwp_boost_min;
2133 wrmsrl(MSR_HWP_REQUEST, hwp_req);
2134 cpu->last_update = cpu->sample.time;
2135}
2136
2137static inline void intel_pstate_hwp_boost_down(struct cpudata *cpu)
2138{
2139 if (cpu->hwp_boost_min) {
2140 bool expired;
2141
2142 /* Check if we are idle for hold time to boost down */
2143 expired = time_after64(cpu->sample.time, cpu->last_update +
2144 hwp_boost_hold_time_ns);
2145 if (expired) {
2146 wrmsrl(MSR_HWP_REQUEST, cpu->hwp_req_cached);
2147 cpu->hwp_boost_min = 0;
2148 }
2149 }
2150 cpu->last_update = cpu->sample.time;
2151}
2152
2153static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu,
2154 u64 time)
2155{
2156 cpu->sample.time = time;
2157
2158 if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) {
2159 bool do_io = false;
2160
2161 cpu->sched_flags = 0;
2162 /*
2163 * Set iowait_boost flag and update time. Since IO WAIT flag
2164 * is set all the time, we can't just conclude that there is
2165 * some IO bound activity is scheduled on this CPU with just
2166 * one occurrence. If we receive at least two in two
2167 * consecutive ticks, then we treat as boost candidate.
2168 */
2169 if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC))
2170 do_io = true;
2171
2172 cpu->last_io_update = time;
2173
2174 if (do_io)
2175 intel_pstate_hwp_boost_up(cpu);
2176
2177 } else {
2178 intel_pstate_hwp_boost_down(cpu);
2179 }
2180}
2181
2182static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
2183 u64 time, unsigned int flags)
2184{
2185 struct cpudata *cpu = container_of(data, struct cpudata, update_util);
2186
2187 cpu->sched_flags |= flags;
2188
2189 if (smp_processor_id() == cpu->cpu)
2190 intel_pstate_update_util_hwp_local(cpu, time);
2191}
2192
2193static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
2194{
2195 struct sample *sample = &cpu->sample;
2196
2197 sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf);
2198}
2199
2200static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
2201{
2202 u64 aperf, mperf;
2203 unsigned long flags;
2204 u64 tsc;
2205
2206 local_irq_save(flags);
2207 rdmsrl(MSR_IA32_APERF, aperf);
2208 rdmsrl(MSR_IA32_MPERF, mperf);
2209 tsc = rdtsc();
2210 if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) {
2211 local_irq_restore(flags);
2212 return false;
2213 }
2214 local_irq_restore(flags);
2215
2216 cpu->last_sample_time = cpu->sample.time;
2217 cpu->sample.time = time;
2218 cpu->sample.aperf = aperf;
2219 cpu->sample.mperf = mperf;
2220 cpu->sample.tsc = tsc;
2221 cpu->sample.aperf -= cpu->prev_aperf;
2222 cpu->sample.mperf -= cpu->prev_mperf;
2223 cpu->sample.tsc -= cpu->prev_tsc;
2224
2225 cpu->prev_aperf = aperf;
2226 cpu->prev_mperf = mperf;
2227 cpu->prev_tsc = tsc;
2228 /*
2229 * First time this function is invoked in a given cycle, all of the
2230 * previous sample data fields are equal to zero or stale and they must
2231 * be populated with meaningful numbers for things to work, so assume
2232 * that sample.time will always be reset before setting the utilization
2233 * update hook and make the caller skip the sample then.
2234 */
2235 if (cpu->last_sample_time) {
2236 intel_pstate_calc_avg_perf(cpu);
2237 return true;
2238 }
2239 return false;
2240}
2241
2242static inline int32_t get_avg_frequency(struct cpudata *cpu)
2243{
2244 return mul_ext_fp(cpu->sample.core_avg_perf, cpu_khz);
2245}
2246
2247static inline int32_t get_avg_pstate(struct cpudata *cpu)
2248{
2249 return mul_ext_fp(cpu->pstate.max_pstate_physical,
2250 cpu->sample.core_avg_perf);
2251}
2252
2253static inline int32_t get_target_pstate(struct cpudata *cpu)
2254{
2255 struct sample *sample = &cpu->sample;
2256 int32_t busy_frac;
2257 int target, avg_pstate;
2258
2259 busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
2260 sample->tsc);
2261
2262 if (busy_frac < cpu->iowait_boost)
2263 busy_frac = cpu->iowait_boost;
2264
2265 sample->busy_scaled = busy_frac * 100;
2266
2267 target = global.no_turbo || global.turbo_disabled ?
2268 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
2269 target += target >> 2;
2270 target = mul_fp(target, busy_frac);
2271 if (target < cpu->pstate.min_pstate)
2272 target = cpu->pstate.min_pstate;
2273
2274 /*
2275 * If the average P-state during the previous cycle was higher than the
2276 * current target, add 50% of the difference to the target to reduce
2277 * possible performance oscillations and offset possible performance
2278 * loss related to moving the workload from one CPU to another within
2279 * a package/module.
2280 */
2281 avg_pstate = get_avg_pstate(cpu);
2282 if (avg_pstate > target)
2283 target += (avg_pstate - target) >> 1;
2284
2285 return target;
2286}
2287
2288static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
2289{
2290 int min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio);
2291 int max_pstate = max(min_pstate, cpu->max_perf_ratio);
2292
2293 return clamp_t(int, pstate, min_pstate, max_pstate);
2294}
2295
2296static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
2297{
2298 if (pstate == cpu->pstate.current_pstate)
2299 return;
2300
2301 cpu->pstate.current_pstate = pstate;
2302 wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate));
2303}
2304
2305static void intel_pstate_adjust_pstate(struct cpudata *cpu)
2306{
2307 int from = cpu->pstate.current_pstate;
2308 struct sample *sample;
2309 int target_pstate;
2310
2311 update_turbo_state();
2312
2313 target_pstate = get_target_pstate(cpu);
2314 target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
2315 trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
2316 intel_pstate_update_pstate(cpu, target_pstate);
2317
2318 sample = &cpu->sample;
2319 trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf),
2320 fp_toint(sample->busy_scaled),
2321 from,
2322 cpu->pstate.current_pstate,
2323 sample->mperf,
2324 sample->aperf,
2325 sample->tsc,
2326 get_avg_frequency(cpu),
2327 fp_toint(cpu->iowait_boost * 100));
2328}
2329
2330static void intel_pstate_update_util(struct update_util_data *data, u64 time,
2331 unsigned int flags)
2332{
2333 struct cpudata *cpu = container_of(data, struct cpudata, update_util);
2334 u64 delta_ns;
2335
2336 /* Don't allow remote callbacks */
2337 if (smp_processor_id() != cpu->cpu)
2338 return;
2339
2340 delta_ns = time - cpu->last_update;
2341 if (flags & SCHED_CPUFREQ_IOWAIT) {
2342 /* Start over if the CPU may have been idle. */
2343 if (delta_ns > TICK_NSEC) {
2344 cpu->iowait_boost = ONE_EIGHTH_FP;
2345 } else if (cpu->iowait_boost >= ONE_EIGHTH_FP) {
2346 cpu->iowait_boost <<= 1;
2347 if (cpu->iowait_boost > int_tofp(1))
2348 cpu->iowait_boost = int_tofp(1);
2349 } else {
2350 cpu->iowait_boost = ONE_EIGHTH_FP;
2351 }
2352 } else if (cpu->iowait_boost) {
2353 /* Clear iowait_boost if the CPU may have been idle. */
2354 if (delta_ns > TICK_NSEC)
2355 cpu->iowait_boost = 0;
2356 else
2357 cpu->iowait_boost >>= 1;
2358 }
2359 cpu->last_update = time;
2360 delta_ns = time - cpu->sample.time;
2361 if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL)
2362 return;
2363
2364 if (intel_pstate_sample(cpu, time))
2365 intel_pstate_adjust_pstate(cpu);
2366}
2367
2368static struct pstate_funcs core_funcs = {
2369 .get_max = core_get_max_pstate,
2370 .get_max_physical = core_get_max_pstate_physical,
2371 .get_min = core_get_min_pstate,
2372 .get_turbo = core_get_turbo_pstate,
2373 .get_scaling = core_get_scaling,
2374 .get_val = core_get_val,
2375};
2376
2377static const struct pstate_funcs silvermont_funcs = {
2378 .get_max = atom_get_max_pstate,
2379 .get_max_physical = atom_get_max_pstate,
2380 .get_min = atom_get_min_pstate,
2381 .get_turbo = atom_get_turbo_pstate,
2382 .get_val = atom_get_val,
2383 .get_scaling = silvermont_get_scaling,
2384 .get_vid = atom_get_vid,
2385};
2386
2387static const struct pstate_funcs airmont_funcs = {
2388 .get_max = atom_get_max_pstate,
2389 .get_max_physical = atom_get_max_pstate,
2390 .get_min = atom_get_min_pstate,
2391 .get_turbo = atom_get_turbo_pstate,
2392 .get_val = atom_get_val,
2393 .get_scaling = airmont_get_scaling,
2394 .get_vid = atom_get_vid,
2395};
2396
2397static const struct pstate_funcs knl_funcs = {
2398 .get_max = core_get_max_pstate,
2399 .get_max_physical = core_get_max_pstate_physical,
2400 .get_min = core_get_min_pstate,
2401 .get_turbo = knl_get_turbo_pstate,
2402 .get_aperf_mperf_shift = knl_get_aperf_mperf_shift,
2403 .get_scaling = core_get_scaling,
2404 .get_val = core_get_val,
2405};
2406
2407#define X86_MATCH(model, policy) \
2408 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
2409 X86_FEATURE_APERFMPERF, &policy)
2410
2411static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
2412 X86_MATCH(SANDYBRIDGE, core_funcs),
2413 X86_MATCH(SANDYBRIDGE_X, core_funcs),
2414 X86_MATCH(ATOM_SILVERMONT, silvermont_funcs),
2415 X86_MATCH(IVYBRIDGE, core_funcs),
2416 X86_MATCH(HASWELL, core_funcs),
2417 X86_MATCH(BROADWELL, core_funcs),
2418 X86_MATCH(IVYBRIDGE_X, core_funcs),
2419 X86_MATCH(HASWELL_X, core_funcs),
2420 X86_MATCH(HASWELL_L, core_funcs),
2421 X86_MATCH(HASWELL_G, core_funcs),
2422 X86_MATCH(BROADWELL_G, core_funcs),
2423 X86_MATCH(ATOM_AIRMONT, airmont_funcs),
2424 X86_MATCH(SKYLAKE_L, core_funcs),
2425 X86_MATCH(BROADWELL_X, core_funcs),
2426 X86_MATCH(SKYLAKE, core_funcs),
2427 X86_MATCH(BROADWELL_D, core_funcs),
2428 X86_MATCH(XEON_PHI_KNL, knl_funcs),
2429 X86_MATCH(XEON_PHI_KNM, knl_funcs),
2430 X86_MATCH(ATOM_GOLDMONT, core_funcs),
2431 X86_MATCH(ATOM_GOLDMONT_PLUS, core_funcs),
2432 X86_MATCH(SKYLAKE_X, core_funcs),
2433 X86_MATCH(COMETLAKE, core_funcs),
2434 X86_MATCH(ICELAKE_X, core_funcs),
2435 X86_MATCH(TIGERLAKE, core_funcs),
2436 X86_MATCH(SAPPHIRERAPIDS_X, core_funcs),
2437 X86_MATCH(EMERALDRAPIDS_X, core_funcs),
2438 {}
2439};
2440MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
2441
2442static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
2443 X86_MATCH(BROADWELL_D, core_funcs),
2444 X86_MATCH(BROADWELL_X, core_funcs),
2445 X86_MATCH(SKYLAKE_X, core_funcs),
2446 X86_MATCH(ICELAKE_X, core_funcs),
2447 X86_MATCH(SAPPHIRERAPIDS_X, core_funcs),
2448 {}
2449};
2450
2451static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
2452 X86_MATCH(KABYLAKE, core_funcs),
2453 {}
2454};
2455
2456static int intel_pstate_init_cpu(unsigned int cpunum)
2457{
2458 struct cpudata *cpu;
2459
2460 cpu = all_cpu_data[cpunum];
2461
2462 if (!cpu) {
2463 cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
2464 if (!cpu)
2465 return -ENOMEM;
2466
2467 WRITE_ONCE(all_cpu_data[cpunum], cpu);
2468
2469 cpu->cpu = cpunum;
2470
2471 cpu->epp_default = -EINVAL;
2472
2473 if (hwp_active) {
2474 intel_pstate_hwp_enable(cpu);
2475
2476 if (intel_pstate_acpi_pm_profile_server())
2477 hwp_boost = true;
2478 }
2479 } else if (hwp_active) {
2480 /*
2481 * Re-enable HWP in case this happens after a resume from ACPI
2482 * S3 if the CPU was offline during the whole system/resume
2483 * cycle.
2484 */
2485 intel_pstate_hwp_reenable(cpu);
2486 }
2487
2488 cpu->epp_powersave = -EINVAL;
2489 cpu->epp_policy = 0;
2490
2491 intel_pstate_get_cpu_pstates(cpu);
2492
2493 pr_debug("controlling: cpu %d\n", cpunum);
2494
2495 return 0;
2496}
2497
2498static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
2499{
2500 struct cpudata *cpu = all_cpu_data[cpu_num];
2501
2502 if (hwp_active && !hwp_boost)
2503 return;
2504
2505 if (cpu->update_util_set)
2506 return;
2507
2508 /* Prevent intel_pstate_update_util() from using stale data. */
2509 cpu->sample.time = 0;
2510 cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
2511 (hwp_active ?
2512 intel_pstate_update_util_hwp :
2513 intel_pstate_update_util));
2514 cpu->update_util_set = true;
2515}
2516
2517static void intel_pstate_clear_update_util_hook(unsigned int cpu)
2518{
2519 struct cpudata *cpu_data = all_cpu_data[cpu];
2520
2521 if (!cpu_data->update_util_set)
2522 return;
2523
2524 cpufreq_remove_update_util_hook(cpu);
2525 cpu_data->update_util_set = false;
2526 synchronize_rcu();
2527}
2528
2529static int intel_pstate_get_max_freq(struct cpudata *cpu)
2530{
2531 return global.turbo_disabled || global.no_turbo ?
2532 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2533}
2534
2535static void intel_pstate_update_perf_limits(struct cpudata *cpu,
2536 unsigned int policy_min,
2537 unsigned int policy_max)
2538{
2539 int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
2540 int32_t max_policy_perf, min_policy_perf;
2541
2542 max_policy_perf = policy_max / perf_ctl_scaling;
2543 if (policy_max == policy_min) {
2544 min_policy_perf = max_policy_perf;
2545 } else {
2546 min_policy_perf = policy_min / perf_ctl_scaling;
2547 min_policy_perf = clamp_t(int32_t, min_policy_perf,
2548 0, max_policy_perf);
2549 }
2550
2551 /*
2552 * HWP needs some special consideration, because HWP_REQUEST uses
2553 * abstract values to represent performance rather than pure ratios.
2554 */
2555 if (hwp_active && cpu->pstate.scaling != perf_ctl_scaling) {
2556 int freq;
2557
2558 freq = max_policy_perf * perf_ctl_scaling;
2559 max_policy_perf = intel_pstate_freq_to_hwp(cpu, freq);
2560 freq = min_policy_perf * perf_ctl_scaling;
2561 min_policy_perf = intel_pstate_freq_to_hwp(cpu, freq);
2562 }
2563
2564 pr_debug("cpu:%d min_policy_perf:%d max_policy_perf:%d\n",
2565 cpu->cpu, min_policy_perf, max_policy_perf);
2566
2567 /* Normalize user input to [min_perf, max_perf] */
2568 if (per_cpu_limits) {
2569 cpu->min_perf_ratio = min_policy_perf;
2570 cpu->max_perf_ratio = max_policy_perf;
2571 } else {
2572 int turbo_max = cpu->pstate.turbo_pstate;
2573 int32_t global_min, global_max;
2574
2575 /* Global limits are in percent of the maximum turbo P-state. */
2576 global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
2577 global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
2578 global_min = clamp_t(int32_t, global_min, 0, global_max);
2579
2580 pr_debug("cpu:%d global_min:%d global_max:%d\n", cpu->cpu,
2581 global_min, global_max);
2582
2583 cpu->min_perf_ratio = max(min_policy_perf, global_min);
2584 cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf);
2585 cpu->max_perf_ratio = min(max_policy_perf, global_max);
2586 cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio);
2587
2588 /* Make sure min_perf <= max_perf */
2589 cpu->min_perf_ratio = min(cpu->min_perf_ratio,
2590 cpu->max_perf_ratio);
2591
2592 }
2593 pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", cpu->cpu,
2594 cpu->max_perf_ratio,
2595 cpu->min_perf_ratio);
2596}
2597
2598static int intel_pstate_set_policy(struct cpufreq_policy *policy)
2599{
2600 struct cpudata *cpu;
2601
2602 if (!policy->cpuinfo.max_freq)
2603 return -ENODEV;
2604
2605 pr_debug("set_policy cpuinfo.max %u policy->max %u\n",
2606 policy->cpuinfo.max_freq, policy->max);
2607
2608 cpu = all_cpu_data[policy->cpu];
2609 cpu->policy = policy->policy;
2610
2611 mutex_lock(&intel_pstate_limits_lock);
2612
2613 intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2614
2615 if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
2616 /*
2617 * NOHZ_FULL CPUs need this as the governor callback may not
2618 * be invoked on them.
2619 */
2620 intel_pstate_clear_update_util_hook(policy->cpu);
2621 intel_pstate_max_within_limits(cpu);
2622 } else {
2623 intel_pstate_set_update_util_hook(policy->cpu);
2624 }
2625
2626 if (hwp_active) {
2627 /*
2628 * When hwp_boost was active before and dynamically it
2629 * was turned off, in that case we need to clear the
2630 * update util hook.
2631 */
2632 if (!hwp_boost)
2633 intel_pstate_clear_update_util_hook(policy->cpu);
2634 intel_pstate_hwp_set(policy->cpu);
2635 }
2636 /*
2637 * policy->cur is never updated with the intel_pstate driver, but it
2638 * is used as a stale frequency value. So, keep it within limits.
2639 */
2640 policy->cur = policy->min;
2641
2642 mutex_unlock(&intel_pstate_limits_lock);
2643
2644 return 0;
2645}
2646
2647static void intel_pstate_adjust_policy_max(struct cpudata *cpu,
2648 struct cpufreq_policy_data *policy)
2649{
2650 if (!hwp_active &&
2651 cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate &&
2652 policy->max < policy->cpuinfo.max_freq &&
2653 policy->max > cpu->pstate.max_freq) {
2654 pr_debug("policy->max > max non turbo frequency\n");
2655 policy->max = policy->cpuinfo.max_freq;
2656 }
2657}
2658
2659static void intel_pstate_verify_cpu_policy(struct cpudata *cpu,
2660 struct cpufreq_policy_data *policy)
2661{
2662 int max_freq;
2663
2664 update_turbo_state();
2665 if (hwp_active) {
2666 intel_pstate_get_hwp_cap(cpu);
2667 max_freq = global.no_turbo || global.turbo_disabled ?
2668 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2669 } else {
2670 max_freq = intel_pstate_get_max_freq(cpu);
2671 }
2672 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, max_freq);
2673
2674 intel_pstate_adjust_policy_max(cpu, policy);
2675}
2676
2677static int intel_pstate_verify_policy(struct cpufreq_policy_data *policy)
2678{
2679 intel_pstate_verify_cpu_policy(all_cpu_data[policy->cpu], policy);
2680
2681 return 0;
2682}
2683
2684static int intel_cpufreq_cpu_offline(struct cpufreq_policy *policy)
2685{
2686 struct cpudata *cpu = all_cpu_data[policy->cpu];
2687
2688 pr_debug("CPU %d going offline\n", cpu->cpu);
2689
2690 if (cpu->suspended)
2691 return 0;
2692
2693 /*
2694 * If the CPU is an SMT thread and it goes offline with the performance
2695 * settings different from the minimum, it will prevent its sibling
2696 * from getting to lower performance levels, so force the minimum
2697 * performance on CPU offline to prevent that from happening.
2698 */
2699 if (hwp_active)
2700 intel_pstate_hwp_offline(cpu);
2701 else
2702 intel_pstate_set_min_pstate(cpu);
2703
2704 intel_pstate_exit_perf_limits(policy);
2705
2706 return 0;
2707}
2708
2709static int intel_pstate_cpu_online(struct cpufreq_policy *policy)
2710{
2711 struct cpudata *cpu = all_cpu_data[policy->cpu];
2712
2713 pr_debug("CPU %d going online\n", cpu->cpu);
2714
2715 intel_pstate_init_acpi_perf_limits(policy);
2716
2717 if (hwp_active) {
2718 /*
2719 * Re-enable HWP and clear the "suspended" flag to let "resume"
2720 * know that it need not do that.
2721 */
2722 intel_pstate_hwp_reenable(cpu);
2723 cpu->suspended = false;
2724 }
2725
2726 return 0;
2727}
2728
2729static int intel_pstate_cpu_offline(struct cpufreq_policy *policy)
2730{
2731 intel_pstate_clear_update_util_hook(policy->cpu);
2732
2733 return intel_cpufreq_cpu_offline(policy);
2734}
2735
2736static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
2737{
2738 pr_debug("CPU %d exiting\n", policy->cpu);
2739
2740 policy->fast_switch_possible = false;
2741
2742 return 0;
2743}
2744
2745static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
2746{
2747 struct cpudata *cpu;
2748 int rc;
2749
2750 rc = intel_pstate_init_cpu(policy->cpu);
2751 if (rc)
2752 return rc;
2753
2754 cpu = all_cpu_data[policy->cpu];
2755
2756 cpu->max_perf_ratio = 0xFF;
2757 cpu->min_perf_ratio = 0;
2758
2759 /* cpuinfo and default policy values */
2760 policy->cpuinfo.min_freq = cpu->pstate.min_freq;
2761 update_turbo_state();
2762 global.turbo_disabled_mf = global.turbo_disabled;
2763 policy->cpuinfo.max_freq = global.turbo_disabled ?
2764 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2765
2766 policy->min = policy->cpuinfo.min_freq;
2767 policy->max = policy->cpuinfo.max_freq;
2768
2769 intel_pstate_init_acpi_perf_limits(policy);
2770
2771 policy->fast_switch_possible = true;
2772
2773 return 0;
2774}
2775
2776static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
2777{
2778 int ret = __intel_pstate_cpu_init(policy);
2779
2780 if (ret)
2781 return ret;
2782
2783 /*
2784 * Set the policy to powersave to provide a valid fallback value in case
2785 * the default cpufreq governor is neither powersave nor performance.
2786 */
2787 policy->policy = CPUFREQ_POLICY_POWERSAVE;
2788
2789 if (hwp_active) {
2790 struct cpudata *cpu = all_cpu_data[policy->cpu];
2791
2792 cpu->epp_cached = intel_pstate_get_epp(cpu, 0);
2793 }
2794
2795 return 0;
2796}
2797
2798static struct cpufreq_driver intel_pstate = {
2799 .flags = CPUFREQ_CONST_LOOPS,
2800 .verify = intel_pstate_verify_policy,
2801 .setpolicy = intel_pstate_set_policy,
2802 .suspend = intel_pstate_suspend,
2803 .resume = intel_pstate_resume,
2804 .init = intel_pstate_cpu_init,
2805 .exit = intel_pstate_cpu_exit,
2806 .offline = intel_pstate_cpu_offline,
2807 .online = intel_pstate_cpu_online,
2808 .update_limits = intel_pstate_update_limits,
2809 .name = "intel_pstate",
2810};
2811
2812static int intel_cpufreq_verify_policy(struct cpufreq_policy_data *policy)
2813{
2814 struct cpudata *cpu = all_cpu_data[policy->cpu];
2815
2816 intel_pstate_verify_cpu_policy(cpu, policy);
2817 intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2818
2819 return 0;
2820}
2821
2822/* Use of trace in passive mode:
2823 *
2824 * In passive mode the trace core_busy field (also known as the
2825 * performance field, and lablelled as such on the graphs; also known as
2826 * core_avg_perf) is not needed and so is re-assigned to indicate if the
2827 * driver call was via the normal or fast switch path. Various graphs
2828 * output from the intel_pstate_tracer.py utility that include core_busy
2829 * (or performance or core_avg_perf) have a fixed y-axis from 0 to 100%,
2830 * so we use 10 to indicate the normal path through the driver, and
2831 * 90 to indicate the fast switch path through the driver.
2832 * The scaled_busy field is not used, and is set to 0.
2833 */
2834
2835#define INTEL_PSTATE_TRACE_TARGET 10
2836#define INTEL_PSTATE_TRACE_FAST_SWITCH 90
2837
2838static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, int old_pstate)
2839{
2840 struct sample *sample;
2841
2842 if (!trace_pstate_sample_enabled())
2843 return;
2844
2845 if (!intel_pstate_sample(cpu, ktime_get()))
2846 return;
2847
2848 sample = &cpu->sample;
2849 trace_pstate_sample(trace_type,
2850 0,
2851 old_pstate,
2852 cpu->pstate.current_pstate,
2853 sample->mperf,
2854 sample->aperf,
2855 sample->tsc,
2856 get_avg_frequency(cpu),
2857 fp_toint(cpu->iowait_boost * 100));
2858}
2859
2860static void intel_cpufreq_hwp_update(struct cpudata *cpu, u32 min, u32 max,
2861 u32 desired, bool fast_switch)
2862{
2863 u64 prev = READ_ONCE(cpu->hwp_req_cached), value = prev;
2864
2865 value &= ~HWP_MIN_PERF(~0L);
2866 value |= HWP_MIN_PERF(min);
2867
2868 value &= ~HWP_MAX_PERF(~0L);
2869 value |= HWP_MAX_PERF(max);
2870
2871 value &= ~HWP_DESIRED_PERF(~0L);
2872 value |= HWP_DESIRED_PERF(desired);
2873
2874 if (value == prev)
2875 return;
2876
2877 WRITE_ONCE(cpu->hwp_req_cached, value);
2878 if (fast_switch)
2879 wrmsrl(MSR_HWP_REQUEST, value);
2880 else
2881 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
2882}
2883
2884static void intel_cpufreq_perf_ctl_update(struct cpudata *cpu,
2885 u32 target_pstate, bool fast_switch)
2886{
2887 if (fast_switch)
2888 wrmsrl(MSR_IA32_PERF_CTL,
2889 pstate_funcs.get_val(cpu, target_pstate));
2890 else
2891 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
2892 pstate_funcs.get_val(cpu, target_pstate));
2893}
2894
2895static int intel_cpufreq_update_pstate(struct cpufreq_policy *policy,
2896 int target_pstate, bool fast_switch)
2897{
2898 struct cpudata *cpu = all_cpu_data[policy->cpu];
2899 int old_pstate = cpu->pstate.current_pstate;
2900
2901 target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
2902 if (hwp_active) {
2903 int max_pstate = policy->strict_target ?
2904 target_pstate : cpu->max_perf_ratio;
2905
2906 intel_cpufreq_hwp_update(cpu, target_pstate, max_pstate, 0,
2907 fast_switch);
2908 } else if (target_pstate != old_pstate) {
2909 intel_cpufreq_perf_ctl_update(cpu, target_pstate, fast_switch);
2910 }
2911
2912 cpu->pstate.current_pstate = target_pstate;
2913
2914 intel_cpufreq_trace(cpu, fast_switch ? INTEL_PSTATE_TRACE_FAST_SWITCH :
2915 INTEL_PSTATE_TRACE_TARGET, old_pstate);
2916
2917 return target_pstate;
2918}
2919
2920static int intel_cpufreq_target(struct cpufreq_policy *policy,
2921 unsigned int target_freq,
2922 unsigned int relation)
2923{
2924 struct cpudata *cpu = all_cpu_data[policy->cpu];
2925 struct cpufreq_freqs freqs;
2926 int target_pstate;
2927
2928 update_turbo_state();
2929
2930 freqs.old = policy->cur;
2931 freqs.new = target_freq;
2932
2933 cpufreq_freq_transition_begin(policy, &freqs);
2934
2935 target_pstate = intel_pstate_freq_to_hwp_rel(cpu, freqs.new, relation);
2936 target_pstate = intel_cpufreq_update_pstate(policy, target_pstate, false);
2937
2938 freqs.new = target_pstate * cpu->pstate.scaling;
2939
2940 cpufreq_freq_transition_end(policy, &freqs, false);
2941
2942 return 0;
2943}
2944
2945static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
2946 unsigned int target_freq)
2947{
2948 struct cpudata *cpu = all_cpu_data[policy->cpu];
2949 int target_pstate;
2950
2951 update_turbo_state();
2952
2953 target_pstate = intel_pstate_freq_to_hwp(cpu, target_freq);
2954
2955 target_pstate = intel_cpufreq_update_pstate(policy, target_pstate, true);
2956
2957 return target_pstate * cpu->pstate.scaling;
2958}
2959
2960static void intel_cpufreq_adjust_perf(unsigned int cpunum,
2961 unsigned long min_perf,
2962 unsigned long target_perf,
2963 unsigned long capacity)
2964{
2965 struct cpudata *cpu = all_cpu_data[cpunum];
2966 u64 hwp_cap = READ_ONCE(cpu->hwp_cap_cached);
2967 int old_pstate = cpu->pstate.current_pstate;
2968 int cap_pstate, min_pstate, max_pstate, target_pstate;
2969
2970 update_turbo_state();
2971 cap_pstate = global.turbo_disabled ? HWP_GUARANTEED_PERF(hwp_cap) :
2972 HWP_HIGHEST_PERF(hwp_cap);
2973
2974 /* Optimization: Avoid unnecessary divisions. */
2975
2976 target_pstate = cap_pstate;
2977 if (target_perf < capacity)
2978 target_pstate = DIV_ROUND_UP(cap_pstate * target_perf, capacity);
2979
2980 min_pstate = cap_pstate;
2981 if (min_perf < capacity)
2982 min_pstate = DIV_ROUND_UP(cap_pstate * min_perf, capacity);
2983
2984 if (min_pstate < cpu->pstate.min_pstate)
2985 min_pstate = cpu->pstate.min_pstate;
2986
2987 if (min_pstate < cpu->min_perf_ratio)
2988 min_pstate = cpu->min_perf_ratio;
2989
2990 if (min_pstate > cpu->max_perf_ratio)
2991 min_pstate = cpu->max_perf_ratio;
2992
2993 max_pstate = min(cap_pstate, cpu->max_perf_ratio);
2994 if (max_pstate < min_pstate)
2995 max_pstate = min_pstate;
2996
2997 target_pstate = clamp_t(int, target_pstate, min_pstate, max_pstate);
2998
2999 intel_cpufreq_hwp_update(cpu, min_pstate, max_pstate, target_pstate, true);
3000
3001 cpu->pstate.current_pstate = target_pstate;
3002 intel_cpufreq_trace(cpu, INTEL_PSTATE_TRACE_FAST_SWITCH, old_pstate);
3003}
3004
3005static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
3006{
3007 struct freq_qos_request *req;
3008 struct cpudata *cpu;
3009 struct device *dev;
3010 int ret, freq;
3011
3012 dev = get_cpu_device(policy->cpu);
3013 if (!dev)
3014 return -ENODEV;
3015
3016 ret = __intel_pstate_cpu_init(policy);
3017 if (ret)
3018 return ret;
3019
3020 policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY;
3021 /* This reflects the intel_pstate_get_cpu_pstates() setting. */
3022 policy->cur = policy->cpuinfo.min_freq;
3023
3024 req = kcalloc(2, sizeof(*req), GFP_KERNEL);
3025 if (!req) {
3026 ret = -ENOMEM;
3027 goto pstate_exit;
3028 }
3029
3030 cpu = all_cpu_data[policy->cpu];
3031
3032 if (hwp_active) {
3033 u64 value;
3034
3035 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY_HWP;
3036
3037 intel_pstate_get_hwp_cap(cpu);
3038
3039 rdmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, &value);
3040 WRITE_ONCE(cpu->hwp_req_cached, value);
3041
3042 cpu->epp_cached = intel_pstate_get_epp(cpu, value);
3043 } else {
3044 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY;
3045 }
3046
3047 freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * global.min_perf_pct, 100);
3048
3049 ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MIN,
3050 freq);
3051 if (ret < 0) {
3052 dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
3053 goto free_req;
3054 }
3055
3056 freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * global.max_perf_pct, 100);
3057
3058 ret = freq_qos_add_request(&policy->constraints, req + 1, FREQ_QOS_MAX,
3059 freq);
3060 if (ret < 0) {
3061 dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
3062 goto remove_min_req;
3063 }
3064
3065 policy->driver_data = req;
3066
3067 return 0;
3068
3069remove_min_req:
3070 freq_qos_remove_request(req);
3071free_req:
3072 kfree(req);
3073pstate_exit:
3074 intel_pstate_exit_perf_limits(policy);
3075
3076 return ret;
3077}
3078
3079static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy)
3080{
3081 struct freq_qos_request *req;
3082
3083 req = policy->driver_data;
3084
3085 freq_qos_remove_request(req + 1);
3086 freq_qos_remove_request(req);
3087 kfree(req);
3088
3089 return intel_pstate_cpu_exit(policy);
3090}
3091
3092static int intel_cpufreq_suspend(struct cpufreq_policy *policy)
3093{
3094 intel_pstate_suspend(policy);
3095
3096 if (hwp_active) {
3097 struct cpudata *cpu = all_cpu_data[policy->cpu];
3098 u64 value = READ_ONCE(cpu->hwp_req_cached);
3099
3100 /*
3101 * Clear the desired perf field in MSR_HWP_REQUEST in case
3102 * intel_cpufreq_adjust_perf() is in use and the last value
3103 * written by it may not be suitable.
3104 */
3105 value &= ~HWP_DESIRED_PERF(~0L);
3106 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
3107 WRITE_ONCE(cpu->hwp_req_cached, value);
3108 }
3109
3110 return 0;
3111}
3112
3113static struct cpufreq_driver intel_cpufreq = {
3114 .flags = CPUFREQ_CONST_LOOPS,
3115 .verify = intel_cpufreq_verify_policy,
3116 .target = intel_cpufreq_target,
3117 .fast_switch = intel_cpufreq_fast_switch,
3118 .init = intel_cpufreq_cpu_init,
3119 .exit = intel_cpufreq_cpu_exit,
3120 .offline = intel_cpufreq_cpu_offline,
3121 .online = intel_pstate_cpu_online,
3122 .suspend = intel_cpufreq_suspend,
3123 .resume = intel_pstate_resume,
3124 .update_limits = intel_pstate_update_limits,
3125 .name = "intel_cpufreq",
3126};
3127
3128static struct cpufreq_driver *default_driver;
3129
3130static void intel_pstate_driver_cleanup(void)
3131{
3132 unsigned int cpu;
3133
3134 cpus_read_lock();
3135 for_each_online_cpu(cpu) {
3136 if (all_cpu_data[cpu]) {
3137 if (intel_pstate_driver == &intel_pstate)
3138 intel_pstate_clear_update_util_hook(cpu);
3139
3140 spin_lock(&hwp_notify_lock);
3141 kfree(all_cpu_data[cpu]);
3142 WRITE_ONCE(all_cpu_data[cpu], NULL);
3143 spin_unlock(&hwp_notify_lock);
3144 }
3145 }
3146 cpus_read_unlock();
3147
3148 intel_pstate_driver = NULL;
3149}
3150
3151static int intel_pstate_register_driver(struct cpufreq_driver *driver)
3152{
3153 int ret;
3154
3155 if (driver == &intel_pstate)
3156 intel_pstate_sysfs_expose_hwp_dynamic_boost();
3157
3158 memset(&global, 0, sizeof(global));
3159 global.max_perf_pct = 100;
3160
3161 intel_pstate_driver = driver;
3162 ret = cpufreq_register_driver(intel_pstate_driver);
3163 if (ret) {
3164 intel_pstate_driver_cleanup();
3165 return ret;
3166 }
3167
3168 global.min_perf_pct = min_perf_pct_min();
3169
3170 return 0;
3171}
3172
3173static ssize_t intel_pstate_show_status(char *buf)
3174{
3175 if (!intel_pstate_driver)
3176 return sprintf(buf, "off\n");
3177
3178 return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
3179 "active" : "passive");
3180}
3181
3182static int intel_pstate_update_status(const char *buf, size_t size)
3183{
3184 if (size == 3 && !strncmp(buf, "off", size)) {
3185 if (!intel_pstate_driver)
3186 return -EINVAL;
3187
3188 if (hwp_active)
3189 return -EBUSY;
3190
3191 cpufreq_unregister_driver(intel_pstate_driver);
3192 intel_pstate_driver_cleanup();
3193 return 0;
3194 }
3195
3196 if (size == 6 && !strncmp(buf, "active", size)) {
3197 if (intel_pstate_driver) {
3198 if (intel_pstate_driver == &intel_pstate)
3199 return 0;
3200
3201 cpufreq_unregister_driver(intel_pstate_driver);
3202 }
3203
3204 return intel_pstate_register_driver(&intel_pstate);
3205 }
3206
3207 if (size == 7 && !strncmp(buf, "passive", size)) {
3208 if (intel_pstate_driver) {
3209 if (intel_pstate_driver == &intel_cpufreq)
3210 return 0;
3211
3212 cpufreq_unregister_driver(intel_pstate_driver);
3213 intel_pstate_sysfs_hide_hwp_dynamic_boost();
3214 }
3215
3216 return intel_pstate_register_driver(&intel_cpufreq);
3217 }
3218
3219 return -EINVAL;
3220}
3221
3222static int no_load __initdata;
3223static int no_hwp __initdata;
3224static int hwp_only __initdata;
3225static unsigned int force_load __initdata;
3226
3227static int __init intel_pstate_msrs_not_valid(void)
3228{
3229 if (!pstate_funcs.get_max(0) ||
3230 !pstate_funcs.get_min(0) ||
3231 !pstate_funcs.get_turbo(0))
3232 return -ENODEV;
3233
3234 return 0;
3235}
3236
3237static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
3238{
3239 pstate_funcs.get_max = funcs->get_max;
3240 pstate_funcs.get_max_physical = funcs->get_max_physical;
3241 pstate_funcs.get_min = funcs->get_min;
3242 pstate_funcs.get_turbo = funcs->get_turbo;
3243 pstate_funcs.get_scaling = funcs->get_scaling;
3244 pstate_funcs.get_val = funcs->get_val;
3245 pstate_funcs.get_vid = funcs->get_vid;
3246 pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
3247}
3248
3249#ifdef CONFIG_ACPI
3250
3251static bool __init intel_pstate_no_acpi_pss(void)
3252{
3253 int i;
3254
3255 for_each_possible_cpu(i) {
3256 acpi_status status;
3257 union acpi_object *pss;
3258 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
3259 struct acpi_processor *pr = per_cpu(processors, i);
3260
3261 if (!pr)
3262 continue;
3263
3264 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
3265 if (ACPI_FAILURE(status))
3266 continue;
3267
3268 pss = buffer.pointer;
3269 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
3270 kfree(pss);
3271 return false;
3272 }
3273
3274 kfree(pss);
3275 }
3276
3277 pr_debug("ACPI _PSS not found\n");
3278 return true;
3279}
3280
3281static bool __init intel_pstate_no_acpi_pcch(void)
3282{
3283 acpi_status status;
3284 acpi_handle handle;
3285
3286 status = acpi_get_handle(NULL, "\\_SB", &handle);
3287 if (ACPI_FAILURE(status))
3288 goto not_found;
3289
3290 if (acpi_has_method(handle, "PCCH"))
3291 return false;
3292
3293not_found:
3294 pr_debug("ACPI PCCH not found\n");
3295 return true;
3296}
3297
3298static bool __init intel_pstate_has_acpi_ppc(void)
3299{
3300 int i;
3301
3302 for_each_possible_cpu(i) {
3303 struct acpi_processor *pr = per_cpu(processors, i);
3304
3305 if (!pr)
3306 continue;
3307 if (acpi_has_method(pr->handle, "_PPC"))
3308 return true;
3309 }
3310 pr_debug("ACPI _PPC not found\n");
3311 return false;
3312}
3313
3314enum {
3315 PSS,
3316 PPC,
3317};
3318
3319/* Hardware vendor-specific info that has its own power management modes */
3320static struct acpi_platform_list plat_info[] __initdata = {
3321 {"HP ", "ProLiant", 0, ACPI_SIG_FADT, all_versions, NULL, PSS},
3322 {"ORACLE", "X4-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3323 {"ORACLE", "X4-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3324 {"ORACLE", "X4-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3325 {"ORACLE", "X3-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3326 {"ORACLE", "X3-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3327 {"ORACLE", "X3-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3328 {"ORACLE", "X4470M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3329 {"ORACLE", "X4270M3 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3330 {"ORACLE", "X4270M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3331 {"ORACLE", "X4170M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3332 {"ORACLE", "X4170 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3333 {"ORACLE", "X4275 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3334 {"ORACLE", "X6-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3335 {"ORACLE", "Sudbury ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
3336 { } /* End */
3337};
3338
3339#define BITMASK_OOB (BIT(8) | BIT(18))
3340
3341static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
3342{
3343 const struct x86_cpu_id *id;
3344 u64 misc_pwr;
3345 int idx;
3346
3347 id = x86_match_cpu(intel_pstate_cpu_oob_ids);
3348 if (id) {
3349 rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
3350 if (misc_pwr & BITMASK_OOB) {
3351 pr_debug("Bit 8 or 18 in the MISC_PWR_MGMT MSR set\n");
3352 pr_debug("P states are controlled in Out of Band mode by the firmware/hardware\n");
3353 return true;
3354 }
3355 }
3356
3357 idx = acpi_match_platform_list(plat_info);
3358 if (idx < 0)
3359 return false;
3360
3361 switch (plat_info[idx].data) {
3362 case PSS:
3363 if (!intel_pstate_no_acpi_pss())
3364 return false;
3365
3366 return intel_pstate_no_acpi_pcch();
3367 case PPC:
3368 return intel_pstate_has_acpi_ppc() && !force_load;
3369 }
3370
3371 return false;
3372}
3373
3374static void intel_pstate_request_control_from_smm(void)
3375{
3376 /*
3377 * It may be unsafe to request P-states control from SMM if _PPC support
3378 * has not been enabled.
3379 */
3380 if (acpi_ppc)
3381 acpi_processor_pstate_control();
3382}
3383#else /* CONFIG_ACPI not enabled */
3384static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
3385static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
3386static inline void intel_pstate_request_control_from_smm(void) {}
3387#endif /* CONFIG_ACPI */
3388
3389#define INTEL_PSTATE_HWP_BROADWELL 0x01
3390
3391#define X86_MATCH_HWP(model, hwp_mode) \
3392 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
3393 X86_FEATURE_HWP, hwp_mode)
3394
3395static const struct x86_cpu_id hwp_support_ids[] __initconst = {
3396 X86_MATCH_HWP(BROADWELL_X, INTEL_PSTATE_HWP_BROADWELL),
3397 X86_MATCH_HWP(BROADWELL_D, INTEL_PSTATE_HWP_BROADWELL),
3398 X86_MATCH_HWP(ANY, 0),
3399 {}
3400};
3401
3402static bool intel_pstate_hwp_is_enabled(void)
3403{
3404 u64 value;
3405
3406 rdmsrl(MSR_PM_ENABLE, value);
3407 return !!(value & 0x1);
3408}
3409
3410static const struct x86_cpu_id intel_epp_balance_perf[] = {
3411 /*
3412 * Set EPP value as 102, this is the max suggested EPP
3413 * which can result in one core turbo frequency for
3414 * AlderLake Mobile CPUs.
3415 */
3416 X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, 102),
3417 X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, 32),
3418 {}
3419};
3420
3421static const struct x86_cpu_id intel_hybrid_scaling_factor[] = {
3422 X86_MATCH_INTEL_FAM6_MODEL(METEORLAKE_L, HYBRID_SCALING_FACTOR_MTL),
3423 {}
3424};
3425
3426static int __init intel_pstate_init(void)
3427{
3428 static struct cpudata **_all_cpu_data;
3429 const struct x86_cpu_id *id;
3430 int rc;
3431
3432 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
3433 return -ENODEV;
3434
3435 id = x86_match_cpu(hwp_support_ids);
3436 if (id) {
3437 hwp_forced = intel_pstate_hwp_is_enabled();
3438
3439 if (hwp_forced)
3440 pr_info("HWP enabled by BIOS\n");
3441 else if (no_load)
3442 return -ENODEV;
3443
3444 copy_cpu_funcs(&core_funcs);
3445 /*
3446 * Avoid enabling HWP for processors without EPP support,
3447 * because that means incomplete HWP implementation which is a
3448 * corner case and supporting it is generally problematic.
3449 *
3450 * If HWP is enabled already, though, there is no choice but to
3451 * deal with it.
3452 */
3453 if ((!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) || hwp_forced) {
3454 WRITE_ONCE(hwp_active, 1);
3455 hwp_mode_bdw = id->driver_data;
3456 intel_pstate.attr = hwp_cpufreq_attrs;
3457 intel_cpufreq.attr = hwp_cpufreq_attrs;
3458 intel_cpufreq.flags |= CPUFREQ_NEED_UPDATE_LIMITS;
3459 intel_cpufreq.adjust_perf = intel_cpufreq_adjust_perf;
3460 if (!default_driver)
3461 default_driver = &intel_pstate;
3462
3463 pstate_funcs.get_cpu_scaling = hwp_get_cpu_scaling;
3464
3465 goto hwp_cpu_matched;
3466 }
3467 pr_info("HWP not enabled\n");
3468 } else {
3469 if (no_load)
3470 return -ENODEV;
3471
3472 id = x86_match_cpu(intel_pstate_cpu_ids);
3473 if (!id) {
3474 pr_info("CPU model not supported\n");
3475 return -ENODEV;
3476 }
3477
3478 copy_cpu_funcs((struct pstate_funcs *)id->driver_data);
3479 }
3480
3481 if (intel_pstate_msrs_not_valid()) {
3482 pr_info("Invalid MSRs\n");
3483 return -ENODEV;
3484 }
3485 /* Without HWP start in the passive mode. */
3486 if (!default_driver)
3487 default_driver = &intel_cpufreq;
3488
3489hwp_cpu_matched:
3490 /*
3491 * The Intel pstate driver will be ignored if the platform
3492 * firmware has its own power management modes.
3493 */
3494 if (intel_pstate_platform_pwr_mgmt_exists()) {
3495 pr_info("P-states controlled by the platform\n");
3496 return -ENODEV;
3497 }
3498
3499 if (!hwp_active && hwp_only)
3500 return -ENOTSUPP;
3501
3502 pr_info("Intel P-state driver initializing\n");
3503
3504 _all_cpu_data = vzalloc(array_size(sizeof(void *), num_possible_cpus()));
3505 if (!_all_cpu_data)
3506 return -ENOMEM;
3507
3508 WRITE_ONCE(all_cpu_data, _all_cpu_data);
3509
3510 intel_pstate_request_control_from_smm();
3511
3512 intel_pstate_sysfs_expose_params();
3513
3514 if (hwp_active) {
3515 const struct x86_cpu_id *id = x86_match_cpu(intel_epp_balance_perf);
3516 const struct x86_cpu_id *hybrid_id = x86_match_cpu(intel_hybrid_scaling_factor);
3517
3518 if (id)
3519 epp_values[EPP_INDEX_BALANCE_PERFORMANCE] = id->driver_data;
3520
3521 if (hybrid_id) {
3522 hybrid_scaling_factor = hybrid_id->driver_data;
3523 pr_debug("hybrid scaling factor: %d\n", hybrid_scaling_factor);
3524 }
3525
3526 }
3527
3528 mutex_lock(&intel_pstate_driver_lock);
3529 rc = intel_pstate_register_driver(default_driver);
3530 mutex_unlock(&intel_pstate_driver_lock);
3531 if (rc) {
3532 intel_pstate_sysfs_remove();
3533 return rc;
3534 }
3535
3536 if (hwp_active) {
3537 const struct x86_cpu_id *id;
3538
3539 id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
3540 if (id) {
3541 set_power_ctl_ee_state(false);
3542 pr_info("Disabling energy efficiency optimization\n");
3543 }
3544
3545 pr_info("HWP enabled\n");
3546 } else if (boot_cpu_has(X86_FEATURE_HYBRID_CPU)) {
3547 pr_warn("Problematic setup: Hybrid processor with disabled HWP\n");
3548 }
3549
3550 return 0;
3551}
3552device_initcall(intel_pstate_init);
3553
3554static int __init intel_pstate_setup(char *str)
3555{
3556 if (!str)
3557 return -EINVAL;
3558
3559 if (!strcmp(str, "disable"))
3560 no_load = 1;
3561 else if (!strcmp(str, "active"))
3562 default_driver = &intel_pstate;
3563 else if (!strcmp(str, "passive"))
3564 default_driver = &intel_cpufreq;
3565
3566 if (!strcmp(str, "no_hwp"))
3567 no_hwp = 1;
3568
3569 if (!strcmp(str, "force"))
3570 force_load = 1;
3571 if (!strcmp(str, "hwp_only"))
3572 hwp_only = 1;
3573 if (!strcmp(str, "per_cpu_perf_limits"))
3574 per_cpu_limits = true;
3575
3576#ifdef CONFIG_ACPI
3577 if (!strcmp(str, "support_acpi_ppc"))
3578 acpi_ppc = true;
3579#endif
3580
3581 return 0;
3582}
3583early_param("intel_pstate", intel_pstate_setup);
3584
3585MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
3586MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * intel_pstate.c: Native P state management for Intel processors
4 *
5 * (C) Copyright 2012 Intel Corporation
6 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
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>
24#include <linux/fs.h>
25#include <linux/acpi.h>
26#include <linux/vmalloc.h>
27#include <linux/pm_qos.h>
28#include <trace/events/power.h>
29
30#include <asm/div64.h>
31#include <asm/msr.h>
32#include <asm/cpu_device_id.h>
33#include <asm/cpufeature.h>
34#include <asm/intel-family.h>
35
36#define INTEL_PSTATE_SAMPLING_INTERVAL (10 * NSEC_PER_MSEC)
37
38#define INTEL_CPUFREQ_TRANSITION_LATENCY 20000
39#define INTEL_CPUFREQ_TRANSITION_DELAY_HWP 5000
40#define INTEL_CPUFREQ_TRANSITION_DELAY 500
41
42#ifdef CONFIG_ACPI
43#include <acpi/processor.h>
44#include <acpi/cppc_acpi.h>
45#endif
46
47#define FRAC_BITS 8
48#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
49#define fp_toint(X) ((X) >> FRAC_BITS)
50
51#define ONE_EIGHTH_FP ((int64_t)1 << (FRAC_BITS - 3))
52
53#define EXT_BITS 6
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)
57
58static inline int32_t mul_fp(int32_t x, int32_t y)
59{
60 return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
61}
62
63static inline int32_t div_fp(s64 x, s64 y)
64{
65 return div64_s64((int64_t)x << FRAC_BITS, y);
66}
67
68static inline int ceiling_fp(int32_t x)
69{
70 int mask, ret;
71
72 ret = fp_toint(x);
73 mask = (1 << FRAC_BITS) - 1;
74 if (x & mask)
75 ret += 1;
76 return ret;
77}
78
79static inline int32_t percent_fp(int percent)
80{
81 return div_fp(percent, 100);
82}
83
84static inline u64 mul_ext_fp(u64 x, u64 y)
85{
86 return (x * y) >> EXT_FRAC_BITS;
87}
88
89static inline u64 div_ext_fp(u64 x, u64 y)
90{
91 return div64_u64(x << EXT_FRAC_BITS, y);
92}
93
94static inline int32_t percent_ext_fp(int percent)
95{
96 return div_ext_fp(percent, 100);
97}
98
99/**
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
111 * current sample
112 * @time: Current time from scheduler
113 *
114 * This structure is used in the cpudata structure to store performance sample
115 * data for choosing next P State.
116 */
117struct sample {
118 int32_t core_avg_perf;
119 int32_t busy_scaled;
120 u64 aperf;
121 u64 mperf;
122 u64 tsc;
123 u64 time;
124};
125
126/**
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
135 * frequency units
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
139 *
140 * Stores the per cpu model P state limits and current P state.
141 */
142struct pstate_data {
143 int current_pstate;
144 int min_pstate;
145 int max_pstate;
146 int max_pstate_physical;
147 int scaling;
148 int turbo_pstate;
149 unsigned int max_freq;
150 unsigned int turbo_freq;
151};
152
153/**
154 * struct vid_data - Stores voltage information data
155 * @min: VID data for this platform corresponding to
156 * the lowest P state
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)
161 *
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.
165 */
166struct vid_data {
167 int min;
168 int max;
169 int turbo;
170 int32_t ratio;
171};
172
173/**
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
182 * P-state capacity.
183 * @max_perf_pct: Maximum capacity limit in percent of the maximum turbo
184 * P-state capacity.
185 */
186struct global_params {
187 bool no_turbo;
188 bool turbo_disabled;
189 bool turbo_disabled_mf;
190 int max_perf_pct;
191 int min_perf_pct;
192};
193
194/**
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
210 * current sample
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
221 * preference/bias
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.
229 *
230 * This structure stores per CPU instance data for all CPUs.
231 */
232struct cpudata {
233 int cpu;
234
235 unsigned int policy;
236 struct update_util_data update_util;
237 bool update_util_set;
238
239 struct pstate_data pstate;
240 struct vid_data vid;
241
242 u64 last_update;
243 u64 last_sample_time;
244 u64 aperf_mperf_shift;
245 u64 prev_aperf;
246 u64 prev_mperf;
247 u64 prev_tsc;
248 u64 prev_cummulative_iowait;
249 struct sample sample;
250 int32_t min_perf_ratio;
251 int32_t max_perf_ratio;
252#ifdef CONFIG_ACPI
253 struct acpi_processor_performance acpi_perf_data;
254 bool valid_pss_table;
255#endif
256 unsigned int iowait_boost;
257 s16 epp_powersave;
258 s16 epp_policy;
259 s16 epp_default;
260 s16 epp_cached;
261 u64 hwp_req_cached;
262 u64 hwp_cap_cached;
263 u64 last_io_update;
264 unsigned int sched_flags;
265 u32 hwp_boost_min;
266 bool suspended;
267};
268
269static struct cpudata **all_cpu_data;
270
271/**
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
281 *
282 * Core and Atom CPU models have different way to get P State limits. This
283 * structure is used to store those callbacks.
284 */
285struct 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 *);
294};
295
296static struct pstate_funcs pstate_funcs __read_mostly;
297
298static int hwp_active __read_mostly;
299static int hwp_mode_bdw __read_mostly;
300static bool per_cpu_limits __read_mostly;
301static bool hwp_boost __read_mostly;
302
303static struct cpufreq_driver *intel_pstate_driver __read_mostly;
304
305#ifdef CONFIG_ACPI
306static bool acpi_ppc;
307#endif
308
309static struct global_params global;
310
311static DEFINE_MUTEX(intel_pstate_driver_lock);
312static DEFINE_MUTEX(intel_pstate_limits_lock);
313
314#ifdef CONFIG_ACPI
315
316static bool intel_pstate_acpi_pm_profile_server(void)
317{
318 if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER ||
319 acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER)
320 return true;
321
322 return false;
323}
324
325static bool intel_pstate_get_ppc_enable_status(void)
326{
327 if (intel_pstate_acpi_pm_profile_server())
328 return true;
329
330 return acpi_ppc;
331}
332
333#ifdef CONFIG_ACPI_CPPC_LIB
334
335/* The work item is needed to avoid CPU hotplug locking issues */
336static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
337{
338 sched_set_itmt_support();
339}
340
341static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
342
343static void intel_pstate_set_itmt_prio(int cpu)
344{
345 struct cppc_perf_caps cppc_perf;
346 static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
347 int ret;
348
349 ret = cppc_get_perf_caps(cpu, &cppc_perf);
350 if (ret)
351 return;
352
353 /*
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.
357 */
358 sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
359
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;
363
364 if (cppc_perf.highest_perf < min_highest_perf)
365 min_highest_perf = cppc_perf.highest_perf;
366
367 if (max_highest_perf > min_highest_perf) {
368 /*
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
372 * to invoke it.
373 */
374 schedule_work(&sched_itmt_work);
375 }
376 }
377}
378
379static int intel_pstate_get_cppc_guranteed(int cpu)
380{
381 struct cppc_perf_caps cppc_perf;
382 int ret;
383
384 ret = cppc_get_perf_caps(cpu, &cppc_perf);
385 if (ret)
386 return ret;
387
388 if (cppc_perf.guaranteed_perf)
389 return cppc_perf.guaranteed_perf;
390
391 return cppc_perf.nominal_perf;
392}
393
394#else /* CONFIG_ACPI_CPPC_LIB */
395static void intel_pstate_set_itmt_prio(int cpu)
396{
397}
398#endif /* CONFIG_ACPI_CPPC_LIB */
399
400static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
401{
402 struct cpudata *cpu;
403 int ret;
404 int i;
405
406 if (hwp_active) {
407 intel_pstate_set_itmt_prio(policy->cpu);
408 return;
409 }
410
411 if (!intel_pstate_get_ppc_enable_status())
412 return;
413
414 cpu = all_cpu_data[policy->cpu];
415
416 ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
417 policy->cpu);
418 if (ret)
419 return;
420
421 /*
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
424 * list directly.
425 */
426 if (cpu->acpi_perf_data.control_register.space_id !=
427 ACPI_ADR_SPACE_FIXED_HARDWARE)
428 goto err;
429
430 /*
431 * If there is only one entry _PSS, simply ignore _PSS and continue as
432 * usual without taking _PSS into account
433 */
434 if (cpu->acpi_perf_data.state_count < 2)
435 goto err;
436
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);
444 }
445
446 /*
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.
456 */
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");
462
463 return;
464
465 err:
466 cpu->valid_pss_table = false;
467 acpi_processor_unregister_performance(policy->cpu);
468}
469
470static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
471{
472 struct cpudata *cpu;
473
474 cpu = all_cpu_data[policy->cpu];
475 if (!cpu->valid_pss_table)
476 return;
477
478 acpi_processor_unregister_performance(policy->cpu);
479}
480#else /* CONFIG_ACPI */
481static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
482{
483}
484
485static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
486{
487}
488
489static inline bool intel_pstate_acpi_pm_profile_server(void)
490{
491 return false;
492}
493#endif /* CONFIG_ACPI */
494
495#ifndef CONFIG_ACPI_CPPC_LIB
496static int intel_pstate_get_cppc_guranteed(int cpu)
497{
498 return -ENOTSUPP;
499}
500#endif /* CONFIG_ACPI_CPPC_LIB */
501
502static inline void update_turbo_state(void)
503{
504 u64 misc_en;
505 struct cpudata *cpu;
506
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);
512}
513
514static int min_perf_pct_min(void)
515{
516 struct cpudata *cpu = all_cpu_data[0];
517 int turbo_pstate = cpu->pstate.turbo_pstate;
518
519 return turbo_pstate ?
520 (cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
521}
522
523static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
524{
525 u64 epb;
526 int ret;
527
528 if (!boot_cpu_has(X86_FEATURE_EPB))
529 return -ENXIO;
530
531 ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
532 if (ret)
533 return (s16)ret;
534
535 return (s16)(epb & 0x0f);
536}
537
538static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
539{
540 s16 epp;
541
542 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
543 /*
544 * When hwp_req_data is 0, means that caller didn't read
545 * MSR_HWP_REQUEST, so need to read and get EPP.
546 */
547 if (!hwp_req_data) {
548 epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,
549 &hwp_req_data);
550 if (epp)
551 return epp;
552 }
553 epp = (hwp_req_data >> 24) & 0xff;
554 } else {
555 /* When there is no EPP present, HWP uses EPB settings */
556 epp = intel_pstate_get_epb(cpu_data);
557 }
558
559 return epp;
560}
561
562static int intel_pstate_set_epb(int cpu, s16 pref)
563{
564 u64 epb;
565 int ret;
566
567 if (!boot_cpu_has(X86_FEATURE_EPB))
568 return -ENXIO;
569
570 ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
571 if (ret)
572 return ret;
573
574 epb = (epb & ~0x0f) | pref;
575 wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb);
576
577 return 0;
578}
579
580/*
581 * EPP/EPB display strings corresponding to EPP index in the
582 * energy_perf_strings[]
583 * index String
584 *-------------------------------------
585 * 0 default
586 * 1 performance
587 * 2 balance_performance
588 * 3 balance_power
589 * 4 power
590 */
591static const char * const energy_perf_strings[] = {
592 "default",
593 "performance",
594 "balance_performance",
595 "balance_power",
596 "power",
597 NULL
598};
599static const unsigned int epp_values[] = {
600 HWP_EPP_PERFORMANCE,
601 HWP_EPP_BALANCE_PERFORMANCE,
602 HWP_EPP_BALANCE_POWERSAVE,
603 HWP_EPP_POWERSAVE
604};
605
606static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data, int *raw_epp)
607{
608 s16 epp;
609 int index = -EINVAL;
610
611 *raw_epp = 0;
612 epp = intel_pstate_get_epp(cpu_data, 0);
613 if (epp < 0)
614 return epp;
615
616 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
617 if (epp == HWP_EPP_PERFORMANCE)
618 return 1;
619 if (epp == HWP_EPP_BALANCE_PERFORMANCE)
620 return 2;
621 if (epp == HWP_EPP_BALANCE_POWERSAVE)
622 return 3;
623 if (epp == HWP_EPP_POWERSAVE)
624 return 4;
625 *raw_epp = epp;
626 return 0;
627 } else if (boot_cpu_has(X86_FEATURE_EPB)) {
628 /*
629 * Range:
630 * 0x00-0x03 : Performance
631 * 0x04-0x07 : Balance performance
632 * 0x08-0x0B : Balance power
633 * 0x0C-0x0F : 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
636 * effectively.
637 */
638 index = (epp >> 2) + 1;
639 }
640
641 return index;
642}
643
644static int intel_pstate_set_epp(struct cpudata *cpu, u32 epp)
645{
646 int ret;
647
648 /*
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.
652 */
653 u64 value = READ_ONCE(cpu->hwp_req_cached);
654
655 value &= ~GENMASK_ULL(31, 24);
656 value |= (u64)epp << 24;
657 /*
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.
661 */
662 WRITE_ONCE(cpu->hwp_req_cached, value);
663 ret = wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
664 if (!ret)
665 cpu->epp_cached = epp;
666
667 return ret;
668}
669
670static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
671 int pref_index, bool use_raw,
672 u32 raw_epp)
673{
674 int epp = -EINVAL;
675 int ret;
676
677 if (!pref_index)
678 epp = cpu_data->epp_default;
679
680 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
681 if (use_raw)
682 epp = raw_epp;
683 else if (epp == -EINVAL)
684 epp = epp_values[pref_index - 1];
685
686 /*
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.
690 */
691 if (epp > 0 && cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
692 return -EBUSY;
693
694 ret = intel_pstate_set_epp(cpu_data, epp);
695 } else {
696 if (epp == -EINVAL)
697 epp = (pref_index - 1) << 2;
698 ret = intel_pstate_set_epb(cpu_data->cpu, epp);
699 }
700
701 return ret;
702}
703
704static ssize_t show_energy_performance_available_preferences(
705 struct cpufreq_policy *policy, char *buf)
706{
707 int i = 0;
708 int ret = 0;
709
710 while (energy_perf_strings[i] != NULL)
711 ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
712
713 ret += sprintf(&buf[ret], "\n");
714
715 return ret;
716}
717
718cpufreq_freq_attr_ro(energy_performance_available_preferences);
719
720static struct cpufreq_driver intel_pstate;
721
722static ssize_t store_energy_performance_preference(
723 struct cpufreq_policy *policy, const char *buf, size_t count)
724{
725 struct cpudata *cpu = all_cpu_data[policy->cpu];
726 char str_preference[21];
727 bool raw = false;
728 ssize_t ret;
729 u32 epp = 0;
730
731 ret = sscanf(buf, "%20s", str_preference);
732 if (ret != 1)
733 return -EINVAL;
734
735 ret = match_string(energy_perf_strings, -1, str_preference);
736 if (ret < 0) {
737 if (!boot_cpu_has(X86_FEATURE_HWP_EPP))
738 return ret;
739
740 ret = kstrtouint(buf, 10, &epp);
741 if (ret)
742 return ret;
743
744 if (epp > 255)
745 return -EINVAL;
746
747 raw = true;
748 }
749
750 /*
751 * This function runs with the policy R/W semaphore held, which
752 * guarantees that the driver pointer will not change while it is
753 * running.
754 */
755 if (!intel_pstate_driver)
756 return -EAGAIN;
757
758 mutex_lock(&intel_pstate_limits_lock);
759
760 if (intel_pstate_driver == &intel_pstate) {
761 ret = intel_pstate_set_energy_pref_index(cpu, ret, raw, epp);
762 } else {
763 /*
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
767 * upfront.
768 */
769 if (!raw)
770 epp = ret ? epp_values[ret - 1] : cpu->epp_default;
771
772 if (cpu->epp_cached != epp) {
773 int err;
774
775 cpufreq_stop_governor(policy);
776 ret = intel_pstate_set_epp(cpu, epp);
777 err = cpufreq_start_governor(policy);
778 if (!ret)
779 ret = err;
780 }
781 }
782
783 mutex_unlock(&intel_pstate_limits_lock);
784
785 return ret ?: count;
786}
787
788static ssize_t show_energy_performance_preference(
789 struct cpufreq_policy *policy, char *buf)
790{
791 struct cpudata *cpu_data = all_cpu_data[policy->cpu];
792 int preference, raw_epp;
793
794 preference = intel_pstate_get_energy_pref_index(cpu_data, &raw_epp);
795 if (preference < 0)
796 return preference;
797
798 if (raw_epp)
799 return sprintf(buf, "%d\n", raw_epp);
800 else
801 return sprintf(buf, "%s\n", energy_perf_strings[preference]);
802}
803
804cpufreq_freq_attr_rw(energy_performance_preference);
805
806static ssize_t show_base_frequency(struct cpufreq_policy *policy, char *buf)
807{
808 struct cpudata *cpu;
809 u64 cap;
810 int ratio;
811
812 ratio = intel_pstate_get_cppc_guranteed(policy->cpu);
813 if (ratio <= 0) {
814 rdmsrl_on_cpu(policy->cpu, MSR_HWP_CAPABILITIES, &cap);
815 ratio = HWP_GUARANTEED_PERF(cap);
816 }
817
818 cpu = all_cpu_data[policy->cpu];
819
820 return sprintf(buf, "%d\n", ratio * cpu->pstate.scaling);
821}
822
823cpufreq_freq_attr_ro(base_frequency);
824
825static struct freq_attr *hwp_cpufreq_attrs[] = {
826 &energy_performance_preference,
827 &energy_performance_available_preferences,
828 &base_frequency,
829 NULL,
830};
831
832static void intel_pstate_get_hwp_max(unsigned int cpu, int *phy_max,
833 int *current_max)
834{
835 u64 cap;
836
837 rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
838 WRITE_ONCE(all_cpu_data[cpu]->hwp_cap_cached, cap);
839 if (global.no_turbo || global.turbo_disabled)
840 *current_max = HWP_GUARANTEED_PERF(cap);
841 else
842 *current_max = HWP_HIGHEST_PERF(cap);
843
844 *phy_max = HWP_HIGHEST_PERF(cap);
845}
846
847static void intel_pstate_hwp_set(unsigned int cpu)
848{
849 struct cpudata *cpu_data = all_cpu_data[cpu];
850 int max, min;
851 u64 value;
852 s16 epp;
853
854 max = cpu_data->max_perf_ratio;
855 min = cpu_data->min_perf_ratio;
856
857 if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
858 min = max;
859
860 rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
861
862 value &= ~HWP_MIN_PERF(~0L);
863 value |= HWP_MIN_PERF(min);
864
865 value &= ~HWP_MAX_PERF(~0L);
866 value |= HWP_MAX_PERF(max);
867
868 if (cpu_data->epp_policy == cpu_data->policy)
869 goto skip_epp;
870
871 cpu_data->epp_policy = cpu_data->policy;
872
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 */
877 if (epp < 0)
878 goto skip_epp;
879
880 epp = 0;
881 } else {
882 /* skip setting EPP, when saved value is invalid */
883 if (cpu_data->epp_powersave < 0)
884 goto skip_epp;
885
886 /*
887 * No need to restore EPP when it is not zero. This
888 * means:
889 * - Policy is not changed
890 * - user has manually changed
891 * - Error reading EPB
892 */
893 epp = intel_pstate_get_epp(cpu_data, value);
894 if (epp)
895 goto skip_epp;
896
897 epp = cpu_data->epp_powersave;
898 }
899 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
900 value &= ~GENMASK_ULL(31, 24);
901 value |= (u64)epp << 24;
902 } else {
903 intel_pstate_set_epb(cpu, epp);
904 }
905skip_epp:
906 WRITE_ONCE(cpu_data->hwp_req_cached, value);
907 wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
908}
909
910static void intel_pstate_hwp_offline(struct cpudata *cpu)
911{
912 u64 value = READ_ONCE(cpu->hwp_req_cached);
913 int min_perf;
914
915 if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
916 /*
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.
920 */
921 value &= ~GENMASK_ULL(31, 24);
922 value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
923 WRITE_ONCE(cpu->hwp_req_cached, value);
924 }
925
926 value &= ~GENMASK_ULL(31, 0);
927 min_perf = HWP_LOWEST_PERF(cpu->hwp_cap_cached);
928
929 /* Set hwp_max = hwp_min */
930 value |= HWP_MAX_PERF(min_perf);
931 value |= HWP_MIN_PERF(min_perf);
932
933 /* Set EPP to min */
934 if (boot_cpu_has(X86_FEATURE_HWP_EPP))
935 value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
936
937 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
938}
939
940#define POWER_CTL_EE_ENABLE 1
941#define POWER_CTL_EE_DISABLE 2
942
943static int power_ctl_ee_state;
944
945static void set_power_ctl_ee_state(bool input)
946{
947 u64 power_ctl;
948
949 mutex_lock(&intel_pstate_driver_lock);
950 rdmsrl(MSR_IA32_POWER_CTL, power_ctl);
951 if (input) {
952 power_ctl &= ~BIT(MSR_IA32_POWER_CTL_BIT_EE);
953 power_ctl_ee_state = POWER_CTL_EE_ENABLE;
954 } else {
955 power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
956 power_ctl_ee_state = POWER_CTL_EE_DISABLE;
957 }
958 wrmsrl(MSR_IA32_POWER_CTL, power_ctl);
959 mutex_unlock(&intel_pstate_driver_lock);
960}
961
962static void intel_pstate_hwp_enable(struct cpudata *cpudata);
963
964static void intel_pstate_hwp_reenable(struct cpudata *cpu)
965{
966 intel_pstate_hwp_enable(cpu);
967 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, READ_ONCE(cpu->hwp_req_cached));
968}
969
970static int intel_pstate_suspend(struct cpufreq_policy *policy)
971{
972 struct cpudata *cpu = all_cpu_data[policy->cpu];
973
974 pr_debug("CPU %d suspending\n", cpu->cpu);
975
976 cpu->suspended = true;
977
978 return 0;
979}
980
981static int intel_pstate_resume(struct cpufreq_policy *policy)
982{
983 struct cpudata *cpu = all_cpu_data[policy->cpu];
984
985 pr_debug("CPU %d resuming\n", cpu->cpu);
986
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);
992
993 if (cpu->suspended && hwp_active) {
994 mutex_lock(&intel_pstate_limits_lock);
995
996 /* Re-enable HWP, because "online" has not done that. */
997 intel_pstate_hwp_reenable(cpu);
998
999 mutex_unlock(&intel_pstate_limits_lock);
1000 }
1001
1002 cpu->suspended = false;
1003
1004 return 0;
1005}
1006
1007static void intel_pstate_update_policies(void)
1008{
1009 int cpu;
1010
1011 for_each_possible_cpu(cpu)
1012 cpufreq_update_policy(cpu);
1013}
1014
1015static void intel_pstate_update_max_freq(unsigned int cpu)
1016{
1017 struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
1018 struct cpudata *cpudata;
1019
1020 if (!policy)
1021 return;
1022
1023 cpudata = all_cpu_data[cpu];
1024 policy->cpuinfo.max_freq = global.turbo_disabled_mf ?
1025 cpudata->pstate.max_freq : cpudata->pstate.turbo_freq;
1026
1027 refresh_frequency_limits(policy);
1028
1029 cpufreq_cpu_release(policy);
1030}
1031
1032static void intel_pstate_update_limits(unsigned int cpu)
1033{
1034 mutex_lock(&intel_pstate_driver_lock);
1035
1036 update_turbo_state();
1037 /*
1038 * If turbo has been turned on or off globally, policy limits for
1039 * all CPUs need to be updated to reflect that.
1040 */
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);
1046 } else {
1047 cpufreq_update_policy(cpu);
1048 }
1049
1050 mutex_unlock(&intel_pstate_driver_lock);
1051}
1052
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) \
1057 { \
1058 return sprintf(buf, "%u\n", global.object); \
1059 }
1060
1061static ssize_t intel_pstate_show_status(char *buf);
1062static int intel_pstate_update_status(const char *buf, size_t size);
1063
1064static ssize_t show_status(struct kobject *kobj,
1065 struct kobj_attribute *attr, char *buf)
1066{
1067 ssize_t ret;
1068
1069 mutex_lock(&intel_pstate_driver_lock);
1070 ret = intel_pstate_show_status(buf);
1071 mutex_unlock(&intel_pstate_driver_lock);
1072
1073 return ret;
1074}
1075
1076static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
1077 const char *buf, size_t count)
1078{
1079 char *p = memchr(buf, '\n', count);
1080 int ret;
1081
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);
1085
1086 return ret < 0 ? ret : count;
1087}
1088
1089static ssize_t show_turbo_pct(struct kobject *kobj,
1090 struct kobj_attribute *attr, char *buf)
1091{
1092 struct cpudata *cpu;
1093 int total, no_turbo, turbo_pct;
1094 uint32_t turbo_fp;
1095
1096 mutex_lock(&intel_pstate_driver_lock);
1097
1098 if (!intel_pstate_driver) {
1099 mutex_unlock(&intel_pstate_driver_lock);
1100 return -EAGAIN;
1101 }
1102
1103 cpu = all_cpu_data[0];
1104
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)));
1109
1110 mutex_unlock(&intel_pstate_driver_lock);
1111
1112 return sprintf(buf, "%u\n", turbo_pct);
1113}
1114
1115static ssize_t show_num_pstates(struct kobject *kobj,
1116 struct kobj_attribute *attr, char *buf)
1117{
1118 struct cpudata *cpu;
1119 int total;
1120
1121 mutex_lock(&intel_pstate_driver_lock);
1122
1123 if (!intel_pstate_driver) {
1124 mutex_unlock(&intel_pstate_driver_lock);
1125 return -EAGAIN;
1126 }
1127
1128 cpu = all_cpu_data[0];
1129 total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
1130
1131 mutex_unlock(&intel_pstate_driver_lock);
1132
1133 return sprintf(buf, "%u\n", total);
1134}
1135
1136static ssize_t show_no_turbo(struct kobject *kobj,
1137 struct kobj_attribute *attr, char *buf)
1138{
1139 ssize_t ret;
1140
1141 mutex_lock(&intel_pstate_driver_lock);
1142
1143 if (!intel_pstate_driver) {
1144 mutex_unlock(&intel_pstate_driver_lock);
1145 return -EAGAIN;
1146 }
1147
1148 update_turbo_state();
1149 if (global.turbo_disabled)
1150 ret = sprintf(buf, "%u\n", global.turbo_disabled);
1151 else
1152 ret = sprintf(buf, "%u\n", global.no_turbo);
1153
1154 mutex_unlock(&intel_pstate_driver_lock);
1155
1156 return ret;
1157}
1158
1159static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
1160 const char *buf, size_t count)
1161{
1162 unsigned int input;
1163 int ret;
1164
1165 ret = sscanf(buf, "%u", &input);
1166 if (ret != 1)
1167 return -EINVAL;
1168
1169 mutex_lock(&intel_pstate_driver_lock);
1170
1171 if (!intel_pstate_driver) {
1172 mutex_unlock(&intel_pstate_driver_lock);
1173 return -EAGAIN;
1174 }
1175
1176 mutex_lock(&intel_pstate_limits_lock);
1177
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);
1183 return -EPERM;
1184 }
1185
1186 global.no_turbo = clamp_t(int, input, 0, 1);
1187
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;
1191
1192 /* Squash the global minimum into the permitted range. */
1193 if (global.min_perf_pct > pct)
1194 global.min_perf_pct = pct;
1195 }
1196
1197 mutex_unlock(&intel_pstate_limits_lock);
1198
1199 intel_pstate_update_policies();
1200
1201 mutex_unlock(&intel_pstate_driver_lock);
1202
1203 return count;
1204}
1205
1206static void update_qos_request(enum freq_qos_req_type type)
1207{
1208 int max_state, turbo_max, freq, i, perf_pct;
1209 struct freq_qos_request *req;
1210 struct cpufreq_policy *policy;
1211
1212 for_each_possible_cpu(i) {
1213 struct cpudata *cpu = all_cpu_data[i];
1214
1215 policy = cpufreq_cpu_get(i);
1216 if (!policy)
1217 continue;
1218
1219 req = policy->driver_data;
1220 cpufreq_cpu_put(policy);
1221
1222 if (!req)
1223 continue;
1224
1225 if (hwp_active)
1226 intel_pstate_get_hwp_max(i, &turbo_max, &max_state);
1227 else
1228 turbo_max = cpu->pstate.turbo_pstate;
1229
1230 if (type == FREQ_QOS_MIN) {
1231 perf_pct = global.min_perf_pct;
1232 } else {
1233 req++;
1234 perf_pct = global.max_perf_pct;
1235 }
1236
1237 freq = DIV_ROUND_UP(turbo_max * perf_pct, 100);
1238 freq *= cpu->pstate.scaling;
1239
1240 if (freq_qos_update_request(req, freq) < 0)
1241 pr_warn("Failed to update freq constraint: CPU%d\n", i);
1242 }
1243}
1244
1245static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
1246 const char *buf, size_t count)
1247{
1248 unsigned int input;
1249 int ret;
1250
1251 ret = sscanf(buf, "%u", &input);
1252 if (ret != 1)
1253 return -EINVAL;
1254
1255 mutex_lock(&intel_pstate_driver_lock);
1256
1257 if (!intel_pstate_driver) {
1258 mutex_unlock(&intel_pstate_driver_lock);
1259 return -EAGAIN;
1260 }
1261
1262 mutex_lock(&intel_pstate_limits_lock);
1263
1264 global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100);
1265
1266 mutex_unlock(&intel_pstate_limits_lock);
1267
1268 if (intel_pstate_driver == &intel_pstate)
1269 intel_pstate_update_policies();
1270 else
1271 update_qos_request(FREQ_QOS_MAX);
1272
1273 mutex_unlock(&intel_pstate_driver_lock);
1274
1275 return count;
1276}
1277
1278static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b,
1279 const char *buf, size_t count)
1280{
1281 unsigned int input;
1282 int ret;
1283
1284 ret = sscanf(buf, "%u", &input);
1285 if (ret != 1)
1286 return -EINVAL;
1287
1288 mutex_lock(&intel_pstate_driver_lock);
1289
1290 if (!intel_pstate_driver) {
1291 mutex_unlock(&intel_pstate_driver_lock);
1292 return -EAGAIN;
1293 }
1294
1295 mutex_lock(&intel_pstate_limits_lock);
1296
1297 global.min_perf_pct = clamp_t(int, input,
1298 min_perf_pct_min(), global.max_perf_pct);
1299
1300 mutex_unlock(&intel_pstate_limits_lock);
1301
1302 if (intel_pstate_driver == &intel_pstate)
1303 intel_pstate_update_policies();
1304 else
1305 update_qos_request(FREQ_QOS_MIN);
1306
1307 mutex_unlock(&intel_pstate_driver_lock);
1308
1309 return count;
1310}
1311
1312static ssize_t show_hwp_dynamic_boost(struct kobject *kobj,
1313 struct kobj_attribute *attr, char *buf)
1314{
1315 return sprintf(buf, "%u\n", hwp_boost);
1316}
1317
1318static ssize_t store_hwp_dynamic_boost(struct kobject *a,
1319 struct kobj_attribute *b,
1320 const char *buf, size_t count)
1321{
1322 unsigned int input;
1323 int ret;
1324
1325 ret = kstrtouint(buf, 10, &input);
1326 if (ret)
1327 return ret;
1328
1329 mutex_lock(&intel_pstate_driver_lock);
1330 hwp_boost = !!input;
1331 intel_pstate_update_policies();
1332 mutex_unlock(&intel_pstate_driver_lock);
1333
1334 return count;
1335}
1336
1337static ssize_t show_energy_efficiency(struct kobject *kobj, struct kobj_attribute *attr,
1338 char *buf)
1339{
1340 u64 power_ctl;
1341 int enable;
1342
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);
1346}
1347
1348static ssize_t store_energy_efficiency(struct kobject *a, struct kobj_attribute *b,
1349 const char *buf, size_t count)
1350{
1351 bool input;
1352 int ret;
1353
1354 ret = kstrtobool(buf, &input);
1355 if (ret)
1356 return ret;
1357
1358 set_power_ctl_ee_state(input);
1359
1360 return count;
1361}
1362
1363show_one(max_perf_pct, max_perf_pct);
1364show_one(min_perf_pct, min_perf_pct);
1365
1366define_one_global_rw(status);
1367define_one_global_rw(no_turbo);
1368define_one_global_rw(max_perf_pct);
1369define_one_global_rw(min_perf_pct);
1370define_one_global_ro(turbo_pct);
1371define_one_global_ro(num_pstates);
1372define_one_global_rw(hwp_dynamic_boost);
1373define_one_global_rw(energy_efficiency);
1374
1375static struct attribute *intel_pstate_attributes[] = {
1376 &status.attr,
1377 &no_turbo.attr,
1378 &turbo_pct.attr,
1379 &num_pstates.attr,
1380 NULL
1381};
1382
1383static const struct attribute_group intel_pstate_attr_group = {
1384 .attrs = intel_pstate_attributes,
1385};
1386
1387static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[];
1388
1389static struct kobject *intel_pstate_kobject;
1390
1391static void __init intel_pstate_sysfs_expose_params(void)
1392{
1393 int rc;
1394
1395 intel_pstate_kobject = kobject_create_and_add("intel_pstate",
1396 &cpu_subsys.dev_root->kobj);
1397 if (WARN_ON(!intel_pstate_kobject))
1398 return;
1399
1400 rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
1401 if (WARN_ON(rc))
1402 return;
1403
1404 /*
1405 * If per cpu limits are enforced there are no global limits, so
1406 * return without creating max/min_perf_pct attributes
1407 */
1408 if (per_cpu_limits)
1409 return;
1410
1411 rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr);
1412 WARN_ON(rc);
1413
1414 rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
1415 WARN_ON(rc);
1416
1417 if (x86_match_cpu(intel_pstate_cpu_ee_disable_ids)) {
1418 rc = sysfs_create_file(intel_pstate_kobject, &energy_efficiency.attr);
1419 WARN_ON(rc);
1420 }
1421}
1422
1423static void intel_pstate_sysfs_expose_hwp_dynamic_boost(void)
1424{
1425 int rc;
1426
1427 if (!hwp_active)
1428 return;
1429
1430 rc = sysfs_create_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1431 WARN_ON_ONCE(rc);
1432}
1433
1434static void intel_pstate_sysfs_hide_hwp_dynamic_boost(void)
1435{
1436 if (!hwp_active)
1437 return;
1438
1439 sysfs_remove_file(intel_pstate_kobject, &hwp_dynamic_boost.attr);
1440}
1441
1442/************************** sysfs end ************************/
1443
1444static void intel_pstate_hwp_enable(struct cpudata *cpudata)
1445{
1446 /* First disable HWP notification interrupt as we don't process them */
1447 if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
1448 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
1449
1450 wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
1451 if (cpudata->epp_default == -EINVAL)
1452 cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
1453}
1454
1455static int atom_get_min_pstate(void)
1456{
1457 u64 value;
1458
1459 rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1460 return (value >> 8) & 0x7F;
1461}
1462
1463static int atom_get_max_pstate(void)
1464{
1465 u64 value;
1466
1467 rdmsrl(MSR_ATOM_CORE_RATIOS, value);
1468 return (value >> 16) & 0x7F;
1469}
1470
1471static int atom_get_turbo_pstate(void)
1472{
1473 u64 value;
1474
1475 rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value);
1476 return value & 0x7F;
1477}
1478
1479static u64 atom_get_val(struct cpudata *cpudata, int pstate)
1480{
1481 u64 val;
1482 int32_t vid_fp;
1483 u32 vid;
1484
1485 val = (u64)pstate << 8;
1486 if (global.no_turbo && !global.turbo_disabled)
1487 val |= (u64)1 << 32;
1488
1489 vid_fp = cpudata->vid.min + mul_fp(
1490 int_tofp(pstate - cpudata->pstate.min_pstate),
1491 cpudata->vid.ratio);
1492
1493 vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
1494 vid = ceiling_fp(vid_fp);
1495
1496 if (pstate > cpudata->pstate.max_pstate)
1497 vid = cpudata->vid.turbo;
1498
1499 return val | vid;
1500}
1501
1502static int silvermont_get_scaling(void)
1503{
1504 u64 value;
1505 int i;
1506 /* Defined in Table 35-6 from SDM (Sept 2015) */
1507 static int silvermont_freq_table[] = {
1508 83300, 100000, 133300, 116700, 80000};
1509
1510 rdmsrl(MSR_FSB_FREQ, value);
1511 i = value & 0x7;
1512 WARN_ON(i > 4);
1513
1514 return silvermont_freq_table[i];
1515}
1516
1517static int airmont_get_scaling(void)
1518{
1519 u64 value;
1520 int i;
1521 /* Defined in Table 35-10 from SDM (Sept 2015) */
1522 static int airmont_freq_table[] = {
1523 83300, 100000, 133300, 116700, 80000,
1524 93300, 90000, 88900, 87500};
1525
1526 rdmsrl(MSR_FSB_FREQ, value);
1527 i = value & 0xF;
1528 WARN_ON(i > 8);
1529
1530 return airmont_freq_table[i];
1531}
1532
1533static void atom_get_vid(struct cpudata *cpudata)
1534{
1535 u64 value;
1536
1537 rdmsrl(MSR_ATOM_CORE_VIDS, value);
1538 cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
1539 cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
1540 cpudata->vid.ratio = div_fp(
1541 cpudata->vid.max - cpudata->vid.min,
1542 int_tofp(cpudata->pstate.max_pstate -
1543 cpudata->pstate.min_pstate));
1544
1545 rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value);
1546 cpudata->vid.turbo = value & 0x7f;
1547}
1548
1549static int core_get_min_pstate(void)
1550{
1551 u64 value;
1552
1553 rdmsrl(MSR_PLATFORM_INFO, value);
1554 return (value >> 40) & 0xFF;
1555}
1556
1557static int core_get_max_pstate_physical(void)
1558{
1559 u64 value;
1560
1561 rdmsrl(MSR_PLATFORM_INFO, value);
1562 return (value >> 8) & 0xFF;
1563}
1564
1565static int core_get_tdp_ratio(u64 plat_info)
1566{
1567 /* Check how many TDP levels present */
1568 if (plat_info & 0x600000000) {
1569 u64 tdp_ctrl;
1570 u64 tdp_ratio;
1571 int tdp_msr;
1572 int err;
1573
1574 /* Get the TDP level (0, 1, 2) to get ratios */
1575 err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
1576 if (err)
1577 return err;
1578
1579 /* TDP MSR are continuous starting at 0x648 */
1580 tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
1581 err = rdmsrl_safe(tdp_msr, &tdp_ratio);
1582 if (err)
1583 return err;
1584
1585 /* For level 1 and 2, bits[23:16] contain the ratio */
1586 if (tdp_ctrl & 0x03)
1587 tdp_ratio >>= 16;
1588
1589 tdp_ratio &= 0xff; /* ratios are only 8 bits long */
1590 pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
1591
1592 return (int)tdp_ratio;
1593 }
1594
1595 return -ENXIO;
1596}
1597
1598static int core_get_max_pstate(void)
1599{
1600 u64 tar;
1601 u64 plat_info;
1602 int max_pstate;
1603 int tdp_ratio;
1604 int err;
1605
1606 rdmsrl(MSR_PLATFORM_INFO, plat_info);
1607 max_pstate = (plat_info >> 8) & 0xFF;
1608
1609 tdp_ratio = core_get_tdp_ratio(plat_info);
1610 if (tdp_ratio <= 0)
1611 return max_pstate;
1612
1613 if (hwp_active) {
1614 /* Turbo activation ratio is not used on HWP platforms */
1615 return tdp_ratio;
1616 }
1617
1618 err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
1619 if (!err) {
1620 int tar_levels;
1621
1622 /* Do some sanity checking for safety */
1623 tar_levels = tar & 0xff;
1624 if (tdp_ratio - 1 == tar_levels) {
1625 max_pstate = tar_levels;
1626 pr_debug("max_pstate=TAC %x\n", max_pstate);
1627 }
1628 }
1629
1630 return max_pstate;
1631}
1632
1633static int core_get_turbo_pstate(void)
1634{
1635 u64 value;
1636 int nont, ret;
1637
1638 rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1639 nont = core_get_max_pstate();
1640 ret = (value) & 255;
1641 if (ret <= nont)
1642 ret = nont;
1643 return ret;
1644}
1645
1646static inline int core_get_scaling(void)
1647{
1648 return 100000;
1649}
1650
1651static u64 core_get_val(struct cpudata *cpudata, int pstate)
1652{
1653 u64 val;
1654
1655 val = (u64)pstate << 8;
1656 if (global.no_turbo && !global.turbo_disabled)
1657 val |= (u64)1 << 32;
1658
1659 return val;
1660}
1661
1662static int knl_get_aperf_mperf_shift(void)
1663{
1664 return 10;
1665}
1666
1667static int knl_get_turbo_pstate(void)
1668{
1669 u64 value;
1670 int nont, ret;
1671
1672 rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
1673 nont = core_get_max_pstate();
1674 ret = (((value) >> 8) & 0xFF);
1675 if (ret <= nont)
1676 ret = nont;
1677 return ret;
1678}
1679
1680static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
1681{
1682 trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
1683 cpu->pstate.current_pstate = pstate;
1684 /*
1685 * Generally, there is no guarantee that this code will always run on
1686 * the CPU being updated, so force the register update to run on the
1687 * right CPU.
1688 */
1689 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
1690 pstate_funcs.get_val(cpu, pstate));
1691}
1692
1693static void intel_pstate_set_min_pstate(struct cpudata *cpu)
1694{
1695 intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
1696}
1697
1698static void intel_pstate_max_within_limits(struct cpudata *cpu)
1699{
1700 int pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio);
1701
1702 update_turbo_state();
1703 intel_pstate_set_pstate(cpu, pstate);
1704}
1705
1706static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
1707{
1708 cpu->pstate.min_pstate = pstate_funcs.get_min();
1709 cpu->pstate.max_pstate = pstate_funcs.get_max();
1710 cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical();
1711 cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
1712 cpu->pstate.scaling = pstate_funcs.get_scaling();
1713 cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
1714
1715 if (hwp_active && !hwp_mode_bdw) {
1716 unsigned int phy_max, current_max;
1717
1718 intel_pstate_get_hwp_max(cpu->cpu, &phy_max, ¤t_max);
1719 cpu->pstate.turbo_freq = phy_max * cpu->pstate.scaling;
1720 cpu->pstate.turbo_pstate = phy_max;
1721 } else {
1722 cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
1723 }
1724
1725 if (pstate_funcs.get_aperf_mperf_shift)
1726 cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();
1727
1728 if (pstate_funcs.get_vid)
1729 pstate_funcs.get_vid(cpu);
1730
1731 intel_pstate_set_min_pstate(cpu);
1732}
1733
1734/*
1735 * Long hold time will keep high perf limits for long time,
1736 * which negatively impacts perf/watt for some workloads,
1737 * like specpower. 3ms is based on experiements on some
1738 * workoads.
1739 */
1740static int hwp_boost_hold_time_ns = 3 * NSEC_PER_MSEC;
1741
1742static inline void intel_pstate_hwp_boost_up(struct cpudata *cpu)
1743{
1744 u64 hwp_req = READ_ONCE(cpu->hwp_req_cached);
1745 u32 max_limit = (hwp_req & 0xff00) >> 8;
1746 u32 min_limit = (hwp_req & 0xff);
1747 u32 boost_level1;
1748
1749 /*
1750 * Cases to consider (User changes via sysfs or boot time):
1751 * If, P0 (Turbo max) = P1 (Guaranteed max) = min:
1752 * No boost, return.
1753 * If, P0 (Turbo max) > P1 (Guaranteed max) = min:
1754 * Should result in one level boost only for P0.
1755 * If, P0 (Turbo max) = P1 (Guaranteed max) > min:
1756 * Should result in two level boost:
1757 * (min + p1)/2 and P1.
1758 * If, P0 (Turbo max) > P1 (Guaranteed max) > min:
1759 * Should result in three level boost:
1760 * (min + p1)/2, P1 and P0.
1761 */
1762
1763 /* If max and min are equal or already at max, nothing to boost */
1764 if (max_limit == min_limit || cpu->hwp_boost_min >= max_limit)
1765 return;
1766
1767 if (!cpu->hwp_boost_min)
1768 cpu->hwp_boost_min = min_limit;
1769
1770 /* level at half way mark between min and guranteed */
1771 boost_level1 = (HWP_GUARANTEED_PERF(cpu->hwp_cap_cached) + min_limit) >> 1;
1772
1773 if (cpu->hwp_boost_min < boost_level1)
1774 cpu->hwp_boost_min = boost_level1;
1775 else if (cpu->hwp_boost_min < HWP_GUARANTEED_PERF(cpu->hwp_cap_cached))
1776 cpu->hwp_boost_min = HWP_GUARANTEED_PERF(cpu->hwp_cap_cached);
1777 else if (cpu->hwp_boost_min == HWP_GUARANTEED_PERF(cpu->hwp_cap_cached) &&
1778 max_limit != HWP_GUARANTEED_PERF(cpu->hwp_cap_cached))
1779 cpu->hwp_boost_min = max_limit;
1780 else
1781 return;
1782
1783 hwp_req = (hwp_req & ~GENMASK_ULL(7, 0)) | cpu->hwp_boost_min;
1784 wrmsrl(MSR_HWP_REQUEST, hwp_req);
1785 cpu->last_update = cpu->sample.time;
1786}
1787
1788static inline void intel_pstate_hwp_boost_down(struct cpudata *cpu)
1789{
1790 if (cpu->hwp_boost_min) {
1791 bool expired;
1792
1793 /* Check if we are idle for hold time to boost down */
1794 expired = time_after64(cpu->sample.time, cpu->last_update +
1795 hwp_boost_hold_time_ns);
1796 if (expired) {
1797 wrmsrl(MSR_HWP_REQUEST, cpu->hwp_req_cached);
1798 cpu->hwp_boost_min = 0;
1799 }
1800 }
1801 cpu->last_update = cpu->sample.time;
1802}
1803
1804static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu,
1805 u64 time)
1806{
1807 cpu->sample.time = time;
1808
1809 if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) {
1810 bool do_io = false;
1811
1812 cpu->sched_flags = 0;
1813 /*
1814 * Set iowait_boost flag and update time. Since IO WAIT flag
1815 * is set all the time, we can't just conclude that there is
1816 * some IO bound activity is scheduled on this CPU with just
1817 * one occurrence. If we receive at least two in two
1818 * consecutive ticks, then we treat as boost candidate.
1819 */
1820 if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC))
1821 do_io = true;
1822
1823 cpu->last_io_update = time;
1824
1825 if (do_io)
1826 intel_pstate_hwp_boost_up(cpu);
1827
1828 } else {
1829 intel_pstate_hwp_boost_down(cpu);
1830 }
1831}
1832
1833static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
1834 u64 time, unsigned int flags)
1835{
1836 struct cpudata *cpu = container_of(data, struct cpudata, update_util);
1837
1838 cpu->sched_flags |= flags;
1839
1840 if (smp_processor_id() == cpu->cpu)
1841 intel_pstate_update_util_hwp_local(cpu, time);
1842}
1843
1844static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
1845{
1846 struct sample *sample = &cpu->sample;
1847
1848 sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf);
1849}
1850
1851static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
1852{
1853 u64 aperf, mperf;
1854 unsigned long flags;
1855 u64 tsc;
1856
1857 local_irq_save(flags);
1858 rdmsrl(MSR_IA32_APERF, aperf);
1859 rdmsrl(MSR_IA32_MPERF, mperf);
1860 tsc = rdtsc();
1861 if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) {
1862 local_irq_restore(flags);
1863 return false;
1864 }
1865 local_irq_restore(flags);
1866
1867 cpu->last_sample_time = cpu->sample.time;
1868 cpu->sample.time = time;
1869 cpu->sample.aperf = aperf;
1870 cpu->sample.mperf = mperf;
1871 cpu->sample.tsc = tsc;
1872 cpu->sample.aperf -= cpu->prev_aperf;
1873 cpu->sample.mperf -= cpu->prev_mperf;
1874 cpu->sample.tsc -= cpu->prev_tsc;
1875
1876 cpu->prev_aperf = aperf;
1877 cpu->prev_mperf = mperf;
1878 cpu->prev_tsc = tsc;
1879 /*
1880 * First time this function is invoked in a given cycle, all of the
1881 * previous sample data fields are equal to zero or stale and they must
1882 * be populated with meaningful numbers for things to work, so assume
1883 * that sample.time will always be reset before setting the utilization
1884 * update hook and make the caller skip the sample then.
1885 */
1886 if (cpu->last_sample_time) {
1887 intel_pstate_calc_avg_perf(cpu);
1888 return true;
1889 }
1890 return false;
1891}
1892
1893static inline int32_t get_avg_frequency(struct cpudata *cpu)
1894{
1895 return mul_ext_fp(cpu->sample.core_avg_perf, cpu_khz);
1896}
1897
1898static inline int32_t get_avg_pstate(struct cpudata *cpu)
1899{
1900 return mul_ext_fp(cpu->pstate.max_pstate_physical,
1901 cpu->sample.core_avg_perf);
1902}
1903
1904static inline int32_t get_target_pstate(struct cpudata *cpu)
1905{
1906 struct sample *sample = &cpu->sample;
1907 int32_t busy_frac;
1908 int target, avg_pstate;
1909
1910 busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
1911 sample->tsc);
1912
1913 if (busy_frac < cpu->iowait_boost)
1914 busy_frac = cpu->iowait_boost;
1915
1916 sample->busy_scaled = busy_frac * 100;
1917
1918 target = global.no_turbo || global.turbo_disabled ?
1919 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
1920 target += target >> 2;
1921 target = mul_fp(target, busy_frac);
1922 if (target < cpu->pstate.min_pstate)
1923 target = cpu->pstate.min_pstate;
1924
1925 /*
1926 * If the average P-state during the previous cycle was higher than the
1927 * current target, add 50% of the difference to the target to reduce
1928 * possible performance oscillations and offset possible performance
1929 * loss related to moving the workload from one CPU to another within
1930 * a package/module.
1931 */
1932 avg_pstate = get_avg_pstate(cpu);
1933 if (avg_pstate > target)
1934 target += (avg_pstate - target) >> 1;
1935
1936 return target;
1937}
1938
1939static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
1940{
1941 int min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio);
1942 int max_pstate = max(min_pstate, cpu->max_perf_ratio);
1943
1944 return clamp_t(int, pstate, min_pstate, max_pstate);
1945}
1946
1947static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
1948{
1949 if (pstate == cpu->pstate.current_pstate)
1950 return;
1951
1952 cpu->pstate.current_pstate = pstate;
1953 wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate));
1954}
1955
1956static void intel_pstate_adjust_pstate(struct cpudata *cpu)
1957{
1958 int from = cpu->pstate.current_pstate;
1959 struct sample *sample;
1960 int target_pstate;
1961
1962 update_turbo_state();
1963
1964 target_pstate = get_target_pstate(cpu);
1965 target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
1966 trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
1967 intel_pstate_update_pstate(cpu, target_pstate);
1968
1969 sample = &cpu->sample;
1970 trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf),
1971 fp_toint(sample->busy_scaled),
1972 from,
1973 cpu->pstate.current_pstate,
1974 sample->mperf,
1975 sample->aperf,
1976 sample->tsc,
1977 get_avg_frequency(cpu),
1978 fp_toint(cpu->iowait_boost * 100));
1979}
1980
1981static void intel_pstate_update_util(struct update_util_data *data, u64 time,
1982 unsigned int flags)
1983{
1984 struct cpudata *cpu = container_of(data, struct cpudata, update_util);
1985 u64 delta_ns;
1986
1987 /* Don't allow remote callbacks */
1988 if (smp_processor_id() != cpu->cpu)
1989 return;
1990
1991 delta_ns = time - cpu->last_update;
1992 if (flags & SCHED_CPUFREQ_IOWAIT) {
1993 /* Start over if the CPU may have been idle. */
1994 if (delta_ns > TICK_NSEC) {
1995 cpu->iowait_boost = ONE_EIGHTH_FP;
1996 } else if (cpu->iowait_boost >= ONE_EIGHTH_FP) {
1997 cpu->iowait_boost <<= 1;
1998 if (cpu->iowait_boost > int_tofp(1))
1999 cpu->iowait_boost = int_tofp(1);
2000 } else {
2001 cpu->iowait_boost = ONE_EIGHTH_FP;
2002 }
2003 } else if (cpu->iowait_boost) {
2004 /* Clear iowait_boost if the CPU may have been idle. */
2005 if (delta_ns > TICK_NSEC)
2006 cpu->iowait_boost = 0;
2007 else
2008 cpu->iowait_boost >>= 1;
2009 }
2010 cpu->last_update = time;
2011 delta_ns = time - cpu->sample.time;
2012 if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL)
2013 return;
2014
2015 if (intel_pstate_sample(cpu, time))
2016 intel_pstate_adjust_pstate(cpu);
2017}
2018
2019static struct pstate_funcs core_funcs = {
2020 .get_max = core_get_max_pstate,
2021 .get_max_physical = core_get_max_pstate_physical,
2022 .get_min = core_get_min_pstate,
2023 .get_turbo = core_get_turbo_pstate,
2024 .get_scaling = core_get_scaling,
2025 .get_val = core_get_val,
2026};
2027
2028static const struct pstate_funcs silvermont_funcs = {
2029 .get_max = atom_get_max_pstate,
2030 .get_max_physical = atom_get_max_pstate,
2031 .get_min = atom_get_min_pstate,
2032 .get_turbo = atom_get_turbo_pstate,
2033 .get_val = atom_get_val,
2034 .get_scaling = silvermont_get_scaling,
2035 .get_vid = atom_get_vid,
2036};
2037
2038static const struct pstate_funcs airmont_funcs = {
2039 .get_max = atom_get_max_pstate,
2040 .get_max_physical = atom_get_max_pstate,
2041 .get_min = atom_get_min_pstate,
2042 .get_turbo = atom_get_turbo_pstate,
2043 .get_val = atom_get_val,
2044 .get_scaling = airmont_get_scaling,
2045 .get_vid = atom_get_vid,
2046};
2047
2048static const struct pstate_funcs knl_funcs = {
2049 .get_max = core_get_max_pstate,
2050 .get_max_physical = core_get_max_pstate_physical,
2051 .get_min = core_get_min_pstate,
2052 .get_turbo = knl_get_turbo_pstate,
2053 .get_aperf_mperf_shift = knl_get_aperf_mperf_shift,
2054 .get_scaling = core_get_scaling,
2055 .get_val = core_get_val,
2056};
2057
2058#define X86_MATCH(model, policy) \
2059 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
2060 X86_FEATURE_APERFMPERF, &policy)
2061
2062static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
2063 X86_MATCH(SANDYBRIDGE, core_funcs),
2064 X86_MATCH(SANDYBRIDGE_X, core_funcs),
2065 X86_MATCH(ATOM_SILVERMONT, silvermont_funcs),
2066 X86_MATCH(IVYBRIDGE, core_funcs),
2067 X86_MATCH(HASWELL, core_funcs),
2068 X86_MATCH(BROADWELL, core_funcs),
2069 X86_MATCH(IVYBRIDGE_X, core_funcs),
2070 X86_MATCH(HASWELL_X, core_funcs),
2071 X86_MATCH(HASWELL_L, core_funcs),
2072 X86_MATCH(HASWELL_G, core_funcs),
2073 X86_MATCH(BROADWELL_G, core_funcs),
2074 X86_MATCH(ATOM_AIRMONT, airmont_funcs),
2075 X86_MATCH(SKYLAKE_L, core_funcs),
2076 X86_MATCH(BROADWELL_X, core_funcs),
2077 X86_MATCH(SKYLAKE, core_funcs),
2078 X86_MATCH(BROADWELL_D, core_funcs),
2079 X86_MATCH(XEON_PHI_KNL, knl_funcs),
2080 X86_MATCH(XEON_PHI_KNM, knl_funcs),
2081 X86_MATCH(ATOM_GOLDMONT, core_funcs),
2082 X86_MATCH(ATOM_GOLDMONT_PLUS, core_funcs),
2083 X86_MATCH(SKYLAKE_X, core_funcs),
2084 {}
2085};
2086MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
2087
2088static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
2089 X86_MATCH(BROADWELL_D, core_funcs),
2090 X86_MATCH(BROADWELL_X, core_funcs),
2091 X86_MATCH(SKYLAKE_X, core_funcs),
2092 {}
2093};
2094
2095static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
2096 X86_MATCH(KABYLAKE, core_funcs),
2097 {}
2098};
2099
2100static const struct x86_cpu_id intel_pstate_hwp_boost_ids[] = {
2101 X86_MATCH(SKYLAKE_X, core_funcs),
2102 X86_MATCH(SKYLAKE, core_funcs),
2103 {}
2104};
2105
2106static int intel_pstate_init_cpu(unsigned int cpunum)
2107{
2108 struct cpudata *cpu;
2109
2110 cpu = all_cpu_data[cpunum];
2111
2112 if (!cpu) {
2113 cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
2114 if (!cpu)
2115 return -ENOMEM;
2116
2117 all_cpu_data[cpunum] = cpu;
2118
2119 cpu->cpu = cpunum;
2120
2121 cpu->epp_default = -EINVAL;
2122
2123 if (hwp_active) {
2124 const struct x86_cpu_id *id;
2125
2126 intel_pstate_hwp_enable(cpu);
2127
2128 id = x86_match_cpu(intel_pstate_hwp_boost_ids);
2129 if (id && intel_pstate_acpi_pm_profile_server())
2130 hwp_boost = true;
2131 }
2132 } else if (hwp_active) {
2133 /*
2134 * Re-enable HWP in case this happens after a resume from ACPI
2135 * S3 if the CPU was offline during the whole system/resume
2136 * cycle.
2137 */
2138 intel_pstate_hwp_reenable(cpu);
2139 }
2140
2141 cpu->epp_powersave = -EINVAL;
2142 cpu->epp_policy = 0;
2143
2144 intel_pstate_get_cpu_pstates(cpu);
2145
2146 pr_debug("controlling: cpu %d\n", cpunum);
2147
2148 return 0;
2149}
2150
2151static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
2152{
2153 struct cpudata *cpu = all_cpu_data[cpu_num];
2154
2155 if (hwp_active && !hwp_boost)
2156 return;
2157
2158 if (cpu->update_util_set)
2159 return;
2160
2161 /* Prevent intel_pstate_update_util() from using stale data. */
2162 cpu->sample.time = 0;
2163 cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
2164 (hwp_active ?
2165 intel_pstate_update_util_hwp :
2166 intel_pstate_update_util));
2167 cpu->update_util_set = true;
2168}
2169
2170static void intel_pstate_clear_update_util_hook(unsigned int cpu)
2171{
2172 struct cpudata *cpu_data = all_cpu_data[cpu];
2173
2174 if (!cpu_data->update_util_set)
2175 return;
2176
2177 cpufreq_remove_update_util_hook(cpu);
2178 cpu_data->update_util_set = false;
2179 synchronize_rcu();
2180}
2181
2182static int intel_pstate_get_max_freq(struct cpudata *cpu)
2183{
2184 return global.turbo_disabled || global.no_turbo ?
2185 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2186}
2187
2188static void intel_pstate_update_perf_limits(struct cpudata *cpu,
2189 unsigned int policy_min,
2190 unsigned int policy_max)
2191{
2192 int max_freq = intel_pstate_get_max_freq(cpu);
2193 int32_t max_policy_perf, min_policy_perf;
2194 int max_state, turbo_max;
2195
2196 /*
2197 * HWP needs some special consideration, because on BDX the
2198 * HWP_REQUEST uses abstract value to represent performance
2199 * rather than pure ratios.
2200 */
2201 if (hwp_active) {
2202 intel_pstate_get_hwp_max(cpu->cpu, &turbo_max, &max_state);
2203 } else {
2204 max_state = global.no_turbo || global.turbo_disabled ?
2205 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
2206 turbo_max = cpu->pstate.turbo_pstate;
2207 }
2208
2209 max_policy_perf = max_state * policy_max / max_freq;
2210 if (policy_max == policy_min) {
2211 min_policy_perf = max_policy_perf;
2212 } else {
2213 min_policy_perf = max_state * policy_min / max_freq;
2214 min_policy_perf = clamp_t(int32_t, min_policy_perf,
2215 0, max_policy_perf);
2216 }
2217
2218 pr_debug("cpu:%d max_state %d min_policy_perf:%d max_policy_perf:%d\n",
2219 cpu->cpu, max_state, min_policy_perf, max_policy_perf);
2220
2221 /* Normalize user input to [min_perf, max_perf] */
2222 if (per_cpu_limits) {
2223 cpu->min_perf_ratio = min_policy_perf;
2224 cpu->max_perf_ratio = max_policy_perf;
2225 } else {
2226 int32_t global_min, global_max;
2227
2228 /* Global limits are in percent of the maximum turbo P-state. */
2229 global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
2230 global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
2231 global_min = clamp_t(int32_t, global_min, 0, global_max);
2232
2233 pr_debug("cpu:%d global_min:%d global_max:%d\n", cpu->cpu,
2234 global_min, global_max);
2235
2236 cpu->min_perf_ratio = max(min_policy_perf, global_min);
2237 cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf);
2238 cpu->max_perf_ratio = min(max_policy_perf, global_max);
2239 cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio);
2240
2241 /* Make sure min_perf <= max_perf */
2242 cpu->min_perf_ratio = min(cpu->min_perf_ratio,
2243 cpu->max_perf_ratio);
2244
2245 }
2246 pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", cpu->cpu,
2247 cpu->max_perf_ratio,
2248 cpu->min_perf_ratio);
2249}
2250
2251static int intel_pstate_set_policy(struct cpufreq_policy *policy)
2252{
2253 struct cpudata *cpu;
2254
2255 if (!policy->cpuinfo.max_freq)
2256 return -ENODEV;
2257
2258 pr_debug("set_policy cpuinfo.max %u policy->max %u\n",
2259 policy->cpuinfo.max_freq, policy->max);
2260
2261 cpu = all_cpu_data[policy->cpu];
2262 cpu->policy = policy->policy;
2263
2264 mutex_lock(&intel_pstate_limits_lock);
2265
2266 intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2267
2268 if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
2269 /*
2270 * NOHZ_FULL CPUs need this as the governor callback may not
2271 * be invoked on them.
2272 */
2273 intel_pstate_clear_update_util_hook(policy->cpu);
2274 intel_pstate_max_within_limits(cpu);
2275 } else {
2276 intel_pstate_set_update_util_hook(policy->cpu);
2277 }
2278
2279 if (hwp_active) {
2280 /*
2281 * When hwp_boost was active before and dynamically it
2282 * was turned off, in that case we need to clear the
2283 * update util hook.
2284 */
2285 if (!hwp_boost)
2286 intel_pstate_clear_update_util_hook(policy->cpu);
2287 intel_pstate_hwp_set(policy->cpu);
2288 }
2289
2290 mutex_unlock(&intel_pstate_limits_lock);
2291
2292 return 0;
2293}
2294
2295static void intel_pstate_adjust_policy_max(struct cpudata *cpu,
2296 struct cpufreq_policy_data *policy)
2297{
2298 if (!hwp_active &&
2299 cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate &&
2300 policy->max < policy->cpuinfo.max_freq &&
2301 policy->max > cpu->pstate.max_freq) {
2302 pr_debug("policy->max > max non turbo frequency\n");
2303 policy->max = policy->cpuinfo.max_freq;
2304 }
2305}
2306
2307static void intel_pstate_verify_cpu_policy(struct cpudata *cpu,
2308 struct cpufreq_policy_data *policy)
2309{
2310 update_turbo_state();
2311 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
2312 intel_pstate_get_max_freq(cpu));
2313
2314 intel_pstate_adjust_policy_max(cpu, policy);
2315}
2316
2317static int intel_pstate_verify_policy(struct cpufreq_policy_data *policy)
2318{
2319 intel_pstate_verify_cpu_policy(all_cpu_data[policy->cpu], policy);
2320
2321 return 0;
2322}
2323
2324static int intel_pstate_cpu_offline(struct cpufreq_policy *policy)
2325{
2326 struct cpudata *cpu = all_cpu_data[policy->cpu];
2327
2328 pr_debug("CPU %d going offline\n", cpu->cpu);
2329
2330 if (cpu->suspended)
2331 return 0;
2332
2333 /*
2334 * If the CPU is an SMT thread and it goes offline with the performance
2335 * settings different from the minimum, it will prevent its sibling
2336 * from getting to lower performance levels, so force the minimum
2337 * performance on CPU offline to prevent that from happening.
2338 */
2339 if (hwp_active)
2340 intel_pstate_hwp_offline(cpu);
2341 else
2342 intel_pstate_set_min_pstate(cpu);
2343
2344 intel_pstate_exit_perf_limits(policy);
2345
2346 return 0;
2347}
2348
2349static int intel_pstate_cpu_online(struct cpufreq_policy *policy)
2350{
2351 struct cpudata *cpu = all_cpu_data[policy->cpu];
2352
2353 pr_debug("CPU %d going online\n", cpu->cpu);
2354
2355 intel_pstate_init_acpi_perf_limits(policy);
2356
2357 if (hwp_active) {
2358 /*
2359 * Re-enable HWP and clear the "suspended" flag to let "resume"
2360 * know that it need not do that.
2361 */
2362 intel_pstate_hwp_reenable(cpu);
2363 cpu->suspended = false;
2364 }
2365
2366 return 0;
2367}
2368
2369static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
2370{
2371 pr_debug("CPU %d stopping\n", policy->cpu);
2372
2373 intel_pstate_clear_update_util_hook(policy->cpu);
2374}
2375
2376static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
2377{
2378 pr_debug("CPU %d exiting\n", policy->cpu);
2379
2380 policy->fast_switch_possible = false;
2381
2382 return 0;
2383}
2384
2385static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
2386{
2387 struct cpudata *cpu;
2388 int rc;
2389
2390 rc = intel_pstate_init_cpu(policy->cpu);
2391 if (rc)
2392 return rc;
2393
2394 cpu = all_cpu_data[policy->cpu];
2395
2396 cpu->max_perf_ratio = 0xFF;
2397 cpu->min_perf_ratio = 0;
2398
2399 policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
2400 policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
2401
2402 /* cpuinfo and default policy values */
2403 policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
2404 update_turbo_state();
2405 global.turbo_disabled_mf = global.turbo_disabled;
2406 policy->cpuinfo.max_freq = global.turbo_disabled ?
2407 cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
2408 policy->cpuinfo.max_freq *= cpu->pstate.scaling;
2409
2410 if (hwp_active) {
2411 unsigned int max_freq;
2412
2413 max_freq = global.turbo_disabled ?
2414 cpu->pstate.max_freq : cpu->pstate.turbo_freq;
2415 if (max_freq < policy->cpuinfo.max_freq)
2416 policy->cpuinfo.max_freq = max_freq;
2417 }
2418
2419 intel_pstate_init_acpi_perf_limits(policy);
2420
2421 policy->fast_switch_possible = true;
2422
2423 return 0;
2424}
2425
2426static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
2427{
2428 int ret = __intel_pstate_cpu_init(policy);
2429
2430 if (ret)
2431 return ret;
2432
2433 /*
2434 * Set the policy to powersave to provide a valid fallback value in case
2435 * the default cpufreq governor is neither powersave nor performance.
2436 */
2437 policy->policy = CPUFREQ_POLICY_POWERSAVE;
2438
2439 if (hwp_active) {
2440 struct cpudata *cpu = all_cpu_data[policy->cpu];
2441
2442 cpu->epp_cached = intel_pstate_get_epp(cpu, 0);
2443 }
2444
2445 return 0;
2446}
2447
2448static struct cpufreq_driver intel_pstate = {
2449 .flags = CPUFREQ_CONST_LOOPS,
2450 .verify = intel_pstate_verify_policy,
2451 .setpolicy = intel_pstate_set_policy,
2452 .suspend = intel_pstate_suspend,
2453 .resume = intel_pstate_resume,
2454 .init = intel_pstate_cpu_init,
2455 .exit = intel_pstate_cpu_exit,
2456 .stop_cpu = intel_pstate_stop_cpu,
2457 .offline = intel_pstate_cpu_offline,
2458 .online = intel_pstate_cpu_online,
2459 .update_limits = intel_pstate_update_limits,
2460 .name = "intel_pstate",
2461};
2462
2463static int intel_cpufreq_verify_policy(struct cpufreq_policy_data *policy)
2464{
2465 struct cpudata *cpu = all_cpu_data[policy->cpu];
2466
2467 intel_pstate_verify_cpu_policy(cpu, policy);
2468 intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
2469
2470 return 0;
2471}
2472
2473/* Use of trace in passive mode:
2474 *
2475 * In passive mode the trace core_busy field (also known as the
2476 * performance field, and lablelled as such on the graphs; also known as
2477 * core_avg_perf) is not needed and so is re-assigned to indicate if the
2478 * driver call was via the normal or fast switch path. Various graphs
2479 * output from the intel_pstate_tracer.py utility that include core_busy
2480 * (or performance or core_avg_perf) have a fixed y-axis from 0 to 100%,
2481 * so we use 10 to indicate the the normal path through the driver, and
2482 * 90 to indicate the fast switch path through the driver.
2483 * The scaled_busy field is not used, and is set to 0.
2484 */
2485
2486#define INTEL_PSTATE_TRACE_TARGET 10
2487#define INTEL_PSTATE_TRACE_FAST_SWITCH 90
2488
2489static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, int old_pstate)
2490{
2491 struct sample *sample;
2492
2493 if (!trace_pstate_sample_enabled())
2494 return;
2495
2496 if (!intel_pstate_sample(cpu, ktime_get()))
2497 return;
2498
2499 sample = &cpu->sample;
2500 trace_pstate_sample(trace_type,
2501 0,
2502 old_pstate,
2503 cpu->pstate.current_pstate,
2504 sample->mperf,
2505 sample->aperf,
2506 sample->tsc,
2507 get_avg_frequency(cpu),
2508 fp_toint(cpu->iowait_boost * 100));
2509}
2510
2511static void intel_cpufreq_adjust_hwp(struct cpudata *cpu, u32 target_pstate,
2512 bool fast_switch)
2513{
2514 u64 prev = READ_ONCE(cpu->hwp_req_cached), value = prev;
2515
2516 value &= ~HWP_MIN_PERF(~0L);
2517 value |= HWP_MIN_PERF(target_pstate);
2518
2519 /*
2520 * The entire MSR needs to be updated in order to update the HWP min
2521 * field in it, so opportunistically update the max too if needed.
2522 */
2523 value &= ~HWP_MAX_PERF(~0L);
2524 value |= HWP_MAX_PERF(cpu->max_perf_ratio);
2525
2526 if (value == prev)
2527 return;
2528
2529 WRITE_ONCE(cpu->hwp_req_cached, value);
2530 if (fast_switch)
2531 wrmsrl(MSR_HWP_REQUEST, value);
2532 else
2533 wrmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, value);
2534}
2535
2536static void intel_cpufreq_adjust_perf_ctl(struct cpudata *cpu,
2537 u32 target_pstate, bool fast_switch)
2538{
2539 if (fast_switch)
2540 wrmsrl(MSR_IA32_PERF_CTL,
2541 pstate_funcs.get_val(cpu, target_pstate));
2542 else
2543 wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
2544 pstate_funcs.get_val(cpu, target_pstate));
2545}
2546
2547static int intel_cpufreq_update_pstate(struct cpudata *cpu, int target_pstate,
2548 bool fast_switch)
2549{
2550 int old_pstate = cpu->pstate.current_pstate;
2551
2552 target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
2553 if (target_pstate != old_pstate) {
2554 cpu->pstate.current_pstate = target_pstate;
2555 if (hwp_active)
2556 intel_cpufreq_adjust_hwp(cpu, target_pstate,
2557 fast_switch);
2558 else
2559 intel_cpufreq_adjust_perf_ctl(cpu, target_pstate,
2560 fast_switch);
2561 }
2562
2563 intel_cpufreq_trace(cpu, fast_switch ? INTEL_PSTATE_TRACE_FAST_SWITCH :
2564 INTEL_PSTATE_TRACE_TARGET, old_pstate);
2565
2566 return target_pstate;
2567}
2568
2569static int intel_cpufreq_target(struct cpufreq_policy *policy,
2570 unsigned int target_freq,
2571 unsigned int relation)
2572{
2573 struct cpudata *cpu = all_cpu_data[policy->cpu];
2574 struct cpufreq_freqs freqs;
2575 int target_pstate;
2576
2577 update_turbo_state();
2578
2579 freqs.old = policy->cur;
2580 freqs.new = target_freq;
2581
2582 cpufreq_freq_transition_begin(policy, &freqs);
2583
2584 switch (relation) {
2585 case CPUFREQ_RELATION_L:
2586 target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling);
2587 break;
2588 case CPUFREQ_RELATION_H:
2589 target_pstate = freqs.new / cpu->pstate.scaling;
2590 break;
2591 default:
2592 target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling);
2593 break;
2594 }
2595
2596 target_pstate = intel_cpufreq_update_pstate(cpu, target_pstate, false);
2597
2598 freqs.new = target_pstate * cpu->pstate.scaling;
2599
2600 cpufreq_freq_transition_end(policy, &freqs, false);
2601
2602 return 0;
2603}
2604
2605static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
2606 unsigned int target_freq)
2607{
2608 struct cpudata *cpu = all_cpu_data[policy->cpu];
2609 int target_pstate;
2610
2611 update_turbo_state();
2612
2613 target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling);
2614
2615 target_pstate = intel_cpufreq_update_pstate(cpu, target_pstate, true);
2616
2617 return target_pstate * cpu->pstate.scaling;
2618}
2619
2620static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
2621{
2622 int max_state, turbo_max, min_freq, max_freq, ret;
2623 struct freq_qos_request *req;
2624 struct cpudata *cpu;
2625 struct device *dev;
2626
2627 dev = get_cpu_device(policy->cpu);
2628 if (!dev)
2629 return -ENODEV;
2630
2631 ret = __intel_pstate_cpu_init(policy);
2632 if (ret)
2633 return ret;
2634
2635 policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY;
2636 /* This reflects the intel_pstate_get_cpu_pstates() setting. */
2637 policy->cur = policy->cpuinfo.min_freq;
2638
2639 req = kcalloc(2, sizeof(*req), GFP_KERNEL);
2640 if (!req) {
2641 ret = -ENOMEM;
2642 goto pstate_exit;
2643 }
2644
2645 cpu = all_cpu_data[policy->cpu];
2646
2647 if (hwp_active) {
2648 u64 value;
2649
2650 intel_pstate_get_hwp_max(policy->cpu, &turbo_max, &max_state);
2651 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY_HWP;
2652 rdmsrl_on_cpu(cpu->cpu, MSR_HWP_REQUEST, &value);
2653 WRITE_ONCE(cpu->hwp_req_cached, value);
2654 cpu->epp_cached = intel_pstate_get_epp(cpu, value);
2655 } else {
2656 turbo_max = cpu->pstate.turbo_pstate;
2657 policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY;
2658 }
2659
2660 min_freq = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
2661 min_freq *= cpu->pstate.scaling;
2662 max_freq = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
2663 max_freq *= cpu->pstate.scaling;
2664
2665 ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MIN,
2666 min_freq);
2667 if (ret < 0) {
2668 dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
2669 goto free_req;
2670 }
2671
2672 ret = freq_qos_add_request(&policy->constraints, req + 1, FREQ_QOS_MAX,
2673 max_freq);
2674 if (ret < 0) {
2675 dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
2676 goto remove_min_req;
2677 }
2678
2679 policy->driver_data = req;
2680
2681 return 0;
2682
2683remove_min_req:
2684 freq_qos_remove_request(req);
2685free_req:
2686 kfree(req);
2687pstate_exit:
2688 intel_pstate_exit_perf_limits(policy);
2689
2690 return ret;
2691}
2692
2693static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy)
2694{
2695 struct freq_qos_request *req;
2696
2697 req = policy->driver_data;
2698
2699 freq_qos_remove_request(req + 1);
2700 freq_qos_remove_request(req);
2701 kfree(req);
2702
2703 return intel_pstate_cpu_exit(policy);
2704}
2705
2706static struct cpufreq_driver intel_cpufreq = {
2707 .flags = CPUFREQ_CONST_LOOPS,
2708 .verify = intel_cpufreq_verify_policy,
2709 .target = intel_cpufreq_target,
2710 .fast_switch = intel_cpufreq_fast_switch,
2711 .init = intel_cpufreq_cpu_init,
2712 .exit = intel_cpufreq_cpu_exit,
2713 .offline = intel_pstate_cpu_offline,
2714 .online = intel_pstate_cpu_online,
2715 .suspend = intel_pstate_suspend,
2716 .resume = intel_pstate_resume,
2717 .update_limits = intel_pstate_update_limits,
2718 .name = "intel_cpufreq",
2719};
2720
2721static struct cpufreq_driver *default_driver;
2722
2723static void intel_pstate_driver_cleanup(void)
2724{
2725 unsigned int cpu;
2726
2727 get_online_cpus();
2728 for_each_online_cpu(cpu) {
2729 if (all_cpu_data[cpu]) {
2730 if (intel_pstate_driver == &intel_pstate)
2731 intel_pstate_clear_update_util_hook(cpu);
2732
2733 kfree(all_cpu_data[cpu]);
2734 all_cpu_data[cpu] = NULL;
2735 }
2736 }
2737 put_online_cpus();
2738
2739 intel_pstate_driver = NULL;
2740}
2741
2742static int intel_pstate_register_driver(struct cpufreq_driver *driver)
2743{
2744 int ret;
2745
2746 if (driver == &intel_pstate)
2747 intel_pstate_sysfs_expose_hwp_dynamic_boost();
2748
2749 memset(&global, 0, sizeof(global));
2750 global.max_perf_pct = 100;
2751
2752 intel_pstate_driver = driver;
2753 ret = cpufreq_register_driver(intel_pstate_driver);
2754 if (ret) {
2755 intel_pstate_driver_cleanup();
2756 return ret;
2757 }
2758
2759 global.min_perf_pct = min_perf_pct_min();
2760
2761 return 0;
2762}
2763
2764static ssize_t intel_pstate_show_status(char *buf)
2765{
2766 if (!intel_pstate_driver)
2767 return sprintf(buf, "off\n");
2768
2769 return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
2770 "active" : "passive");
2771}
2772
2773static int intel_pstate_update_status(const char *buf, size_t size)
2774{
2775 if (size == 3 && !strncmp(buf, "off", size)) {
2776 if (!intel_pstate_driver)
2777 return -EINVAL;
2778
2779 if (hwp_active)
2780 return -EBUSY;
2781
2782 cpufreq_unregister_driver(intel_pstate_driver);
2783 intel_pstate_driver_cleanup();
2784 return 0;
2785 }
2786
2787 if (size == 6 && !strncmp(buf, "active", size)) {
2788 if (intel_pstate_driver) {
2789 if (intel_pstate_driver == &intel_pstate)
2790 return 0;
2791
2792 cpufreq_unregister_driver(intel_pstate_driver);
2793 }
2794
2795 return intel_pstate_register_driver(&intel_pstate);
2796 }
2797
2798 if (size == 7 && !strncmp(buf, "passive", size)) {
2799 if (intel_pstate_driver) {
2800 if (intel_pstate_driver == &intel_cpufreq)
2801 return 0;
2802
2803 cpufreq_unregister_driver(intel_pstate_driver);
2804 intel_pstate_sysfs_hide_hwp_dynamic_boost();
2805 }
2806
2807 return intel_pstate_register_driver(&intel_cpufreq);
2808 }
2809
2810 return -EINVAL;
2811}
2812
2813static int no_load __initdata;
2814static int no_hwp __initdata;
2815static int hwp_only __initdata;
2816static unsigned int force_load __initdata;
2817
2818static int __init intel_pstate_msrs_not_valid(void)
2819{
2820 if (!pstate_funcs.get_max() ||
2821 !pstate_funcs.get_min() ||
2822 !pstate_funcs.get_turbo())
2823 return -ENODEV;
2824
2825 return 0;
2826}
2827
2828static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
2829{
2830 pstate_funcs.get_max = funcs->get_max;
2831 pstate_funcs.get_max_physical = funcs->get_max_physical;
2832 pstate_funcs.get_min = funcs->get_min;
2833 pstate_funcs.get_turbo = funcs->get_turbo;
2834 pstate_funcs.get_scaling = funcs->get_scaling;
2835 pstate_funcs.get_val = funcs->get_val;
2836 pstate_funcs.get_vid = funcs->get_vid;
2837 pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
2838}
2839
2840#ifdef CONFIG_ACPI
2841
2842static bool __init intel_pstate_no_acpi_pss(void)
2843{
2844 int i;
2845
2846 for_each_possible_cpu(i) {
2847 acpi_status status;
2848 union acpi_object *pss;
2849 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
2850 struct acpi_processor *pr = per_cpu(processors, i);
2851
2852 if (!pr)
2853 continue;
2854
2855 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
2856 if (ACPI_FAILURE(status))
2857 continue;
2858
2859 pss = buffer.pointer;
2860 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
2861 kfree(pss);
2862 return false;
2863 }
2864
2865 kfree(pss);
2866 }
2867
2868 pr_debug("ACPI _PSS not found\n");
2869 return true;
2870}
2871
2872static bool __init intel_pstate_no_acpi_pcch(void)
2873{
2874 acpi_status status;
2875 acpi_handle handle;
2876
2877 status = acpi_get_handle(NULL, "\\_SB", &handle);
2878 if (ACPI_FAILURE(status))
2879 goto not_found;
2880
2881 if (acpi_has_method(handle, "PCCH"))
2882 return false;
2883
2884not_found:
2885 pr_debug("ACPI PCCH not found\n");
2886 return true;
2887}
2888
2889static bool __init intel_pstate_has_acpi_ppc(void)
2890{
2891 int i;
2892
2893 for_each_possible_cpu(i) {
2894 struct acpi_processor *pr = per_cpu(processors, i);
2895
2896 if (!pr)
2897 continue;
2898 if (acpi_has_method(pr->handle, "_PPC"))
2899 return true;
2900 }
2901 pr_debug("ACPI _PPC not found\n");
2902 return false;
2903}
2904
2905enum {
2906 PSS,
2907 PPC,
2908};
2909
2910/* Hardware vendor-specific info that has its own power management modes */
2911static struct acpi_platform_list plat_info[] __initdata = {
2912 {"HP ", "ProLiant", 0, ACPI_SIG_FADT, all_versions, NULL, PSS},
2913 {"ORACLE", "X4-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2914 {"ORACLE", "X4-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2915 {"ORACLE", "X4-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2916 {"ORACLE", "X3-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2917 {"ORACLE", "X3-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2918 {"ORACLE", "X3-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2919 {"ORACLE", "X4470M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2920 {"ORACLE", "X4270M3 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2921 {"ORACLE", "X4270M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2922 {"ORACLE", "X4170M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2923 {"ORACLE", "X4170 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2924 {"ORACLE", "X4275 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2925 {"ORACLE", "X6-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2926 {"ORACLE", "Sudbury ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
2927 { } /* End */
2928};
2929
2930#define BITMASK_OOB (BIT(8) | BIT(18))
2931
2932static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
2933{
2934 const struct x86_cpu_id *id;
2935 u64 misc_pwr;
2936 int idx;
2937
2938 id = x86_match_cpu(intel_pstate_cpu_oob_ids);
2939 if (id) {
2940 rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
2941 if (misc_pwr & BITMASK_OOB) {
2942 pr_debug("Bit 8 or 18 in the MISC_PWR_MGMT MSR set\n");
2943 pr_debug("P states are controlled in Out of Band mode by the firmware/hardware\n");
2944 return true;
2945 }
2946 }
2947
2948 idx = acpi_match_platform_list(plat_info);
2949 if (idx < 0)
2950 return false;
2951
2952 switch (plat_info[idx].data) {
2953 case PSS:
2954 if (!intel_pstate_no_acpi_pss())
2955 return false;
2956
2957 return intel_pstate_no_acpi_pcch();
2958 case PPC:
2959 return intel_pstate_has_acpi_ppc() && !force_load;
2960 }
2961
2962 return false;
2963}
2964
2965static void intel_pstate_request_control_from_smm(void)
2966{
2967 /*
2968 * It may be unsafe to request P-states control from SMM if _PPC support
2969 * has not been enabled.
2970 */
2971 if (acpi_ppc)
2972 acpi_processor_pstate_control();
2973}
2974#else /* CONFIG_ACPI not enabled */
2975static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
2976static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
2977static inline void intel_pstate_request_control_from_smm(void) {}
2978#endif /* CONFIG_ACPI */
2979
2980#define INTEL_PSTATE_HWP_BROADWELL 0x01
2981
2982#define X86_MATCH_HWP(model, hwp_mode) \
2983 X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
2984 X86_FEATURE_HWP, hwp_mode)
2985
2986static const struct x86_cpu_id hwp_support_ids[] __initconst = {
2987 X86_MATCH_HWP(BROADWELL_X, INTEL_PSTATE_HWP_BROADWELL),
2988 X86_MATCH_HWP(BROADWELL_D, INTEL_PSTATE_HWP_BROADWELL),
2989 X86_MATCH_HWP(ANY, 0),
2990 {}
2991};
2992
2993static int __init intel_pstate_init(void)
2994{
2995 const struct x86_cpu_id *id;
2996 int rc;
2997
2998 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
2999 return -ENODEV;
3000
3001 if (no_load)
3002 return -ENODEV;
3003
3004 id = x86_match_cpu(hwp_support_ids);
3005 if (id) {
3006 copy_cpu_funcs(&core_funcs);
3007 /*
3008 * Avoid enabling HWP for processors without EPP support,
3009 * because that means incomplete HWP implementation which is a
3010 * corner case and supporting it is generally problematic.
3011 */
3012 if (!no_hwp && boot_cpu_has(X86_FEATURE_HWP_EPP)) {
3013 hwp_active++;
3014 hwp_mode_bdw = id->driver_data;
3015 intel_pstate.attr = hwp_cpufreq_attrs;
3016 intel_cpufreq.attr = hwp_cpufreq_attrs;
3017 if (!default_driver)
3018 default_driver = &intel_pstate;
3019
3020 goto hwp_cpu_matched;
3021 }
3022 } else {
3023 id = x86_match_cpu(intel_pstate_cpu_ids);
3024 if (!id) {
3025 pr_info("CPU model not supported\n");
3026 return -ENODEV;
3027 }
3028
3029 copy_cpu_funcs((struct pstate_funcs *)id->driver_data);
3030 }
3031
3032 if (intel_pstate_msrs_not_valid()) {
3033 pr_info("Invalid MSRs\n");
3034 return -ENODEV;
3035 }
3036 /* Without HWP start in the passive mode. */
3037 if (!default_driver)
3038 default_driver = &intel_cpufreq;
3039
3040hwp_cpu_matched:
3041 /*
3042 * The Intel pstate driver will be ignored if the platform
3043 * firmware has its own power management modes.
3044 */
3045 if (intel_pstate_platform_pwr_mgmt_exists()) {
3046 pr_info("P-states controlled by the platform\n");
3047 return -ENODEV;
3048 }
3049
3050 if (!hwp_active && hwp_only)
3051 return -ENOTSUPP;
3052
3053 pr_info("Intel P-state driver initializing\n");
3054
3055 all_cpu_data = vzalloc(array_size(sizeof(void *), num_possible_cpus()));
3056 if (!all_cpu_data)
3057 return -ENOMEM;
3058
3059 intel_pstate_request_control_from_smm();
3060
3061 intel_pstate_sysfs_expose_params();
3062
3063 mutex_lock(&intel_pstate_driver_lock);
3064 rc = intel_pstate_register_driver(default_driver);
3065 mutex_unlock(&intel_pstate_driver_lock);
3066 if (rc)
3067 return rc;
3068
3069 if (hwp_active) {
3070 const struct x86_cpu_id *id;
3071
3072 id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
3073 if (id) {
3074 set_power_ctl_ee_state(false);
3075 pr_info("Disabling energy efficiency optimization\n");
3076 }
3077
3078 pr_info("HWP enabled\n");
3079 }
3080
3081 return 0;
3082}
3083device_initcall(intel_pstate_init);
3084
3085static int __init intel_pstate_setup(char *str)
3086{
3087 if (!str)
3088 return -EINVAL;
3089
3090 if (!strcmp(str, "disable"))
3091 no_load = 1;
3092 else if (!strcmp(str, "active"))
3093 default_driver = &intel_pstate;
3094 else if (!strcmp(str, "passive"))
3095 default_driver = &intel_cpufreq;
3096
3097 if (!strcmp(str, "no_hwp")) {
3098 pr_info("HWP disabled\n");
3099 no_hwp = 1;
3100 }
3101 if (!strcmp(str, "force"))
3102 force_load = 1;
3103 if (!strcmp(str, "hwp_only"))
3104 hwp_only = 1;
3105 if (!strcmp(str, "per_cpu_perf_limits"))
3106 per_cpu_limits = true;
3107
3108#ifdef CONFIG_ACPI
3109 if (!strcmp(str, "support_acpi_ppc"))
3110 acpi_ppc = true;
3111#endif
3112
3113 return 0;
3114}
3115early_param("intel_pstate", intel_pstate_setup);
3116
3117MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
3118MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
3119MODULE_LICENSE("GPL");