2 * intel_pstate.c: Native P state management for Intel processors
4 * (C) Copyright 2012 Intel Corporation
5 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; version 2
13 #include <linux/kernel.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/module.h>
16 #include <linux/ktime.h>
17 #include <linux/hrtimer.h>
18 #include <linux/tick.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/list.h>
22 #include <linux/cpu.h>
23 #include <linux/cpufreq.h>
24 #include <linux/sysfs.h>
25 #include <linux/types.h>
27 #include <linux/debugfs.h>
28 #include <linux/acpi.h>
29 #include <trace/events/power.h>
31 #include <asm/div64.h>
33 #include <asm/cpu_device_id.h>
35 #define BYT_RATIOS 0x66a
36 #define BYT_VIDS 0x66b
37 #define BYT_TURBO_RATIOS 0x66c
38 #define BYT_TURBO_VIDS 0x66d
42 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
43 #define fp_toint(X) ((X) >> FRAC_BITS)
46 static inline int32_t mul_fp(int32_t x, int32_t y)
48 return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
51 static inline int32_t div_fp(int32_t x, int32_t y)
53 return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
57 int32_t core_pct_busy;
91 struct timer_list timer;
93 struct pstate_data pstate;
97 ktime_t last_sample_time;
100 struct sample sample;
103 static struct cpudata **all_cpu_data;
104 struct pstate_adjust_policy {
113 struct pstate_funcs {
114 int (*get_max)(void);
115 int (*get_min)(void);
116 int (*get_turbo)(void);
117 void (*set)(struct cpudata*, int pstate);
118 void (*get_vid)(struct cpudata *);
121 struct cpu_defaults {
122 struct pstate_adjust_policy pid_policy;
123 struct pstate_funcs funcs;
126 static struct pstate_adjust_policy pid_params;
127 static struct pstate_funcs pstate_funcs;
139 static struct perf_limits limits = {
142 .max_perf = int_tofp(1),
145 .max_policy_pct = 100,
146 .max_sysfs_pct = 100,
149 static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
150 int deadband, int integral) {
151 pid->setpoint = setpoint;
152 pid->deadband = deadband;
153 pid->integral = int_tofp(integral);
154 pid->last_err = int_tofp(setpoint) - int_tofp(busy);
157 static inline void pid_p_gain_set(struct _pid *pid, int percent)
159 pid->p_gain = div_fp(int_tofp(percent), int_tofp(100));
162 static inline void pid_i_gain_set(struct _pid *pid, int percent)
164 pid->i_gain = div_fp(int_tofp(percent), int_tofp(100));
167 static inline void pid_d_gain_set(struct _pid *pid, int percent)
170 pid->d_gain = div_fp(int_tofp(percent), int_tofp(100));
173 static signed int pid_calc(struct _pid *pid, int32_t busy)
176 int32_t pterm, dterm, fp_error;
177 int32_t integral_limit;
179 fp_error = int_tofp(pid->setpoint) - busy;
181 if (abs(fp_error) <= int_tofp(pid->deadband))
184 pterm = mul_fp(pid->p_gain, fp_error);
186 pid->integral += fp_error;
188 /* limit the integral term */
189 integral_limit = int_tofp(30);
190 if (pid->integral > integral_limit)
191 pid->integral = integral_limit;
192 if (pid->integral < -integral_limit)
193 pid->integral = -integral_limit;
195 dterm = mul_fp(pid->d_gain, fp_error - pid->last_err);
196 pid->last_err = fp_error;
198 result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm;
200 result = result + (1 << (FRAC_BITS-1));
202 result = result - (1 << (FRAC_BITS-1));
203 return (signed int)fp_toint(result);
206 static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
208 pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct);
209 pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
210 pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
219 static inline void intel_pstate_reset_all_pid(void)
222 for_each_online_cpu(cpu) {
223 if (all_cpu_data[cpu])
224 intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
228 /************************** debugfs begin ************************/
229 static int pid_param_set(void *data, u64 val)
232 intel_pstate_reset_all_pid();
235 static int pid_param_get(void *data, u64 *val)
240 DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get,
241 pid_param_set, "%llu\n");
248 static struct pid_param pid_files[] = {
249 {"sample_rate_ms", &pid_params.sample_rate_ms},
250 {"d_gain_pct", &pid_params.d_gain_pct},
251 {"i_gain_pct", &pid_params.i_gain_pct},
252 {"deadband", &pid_params.deadband},
253 {"setpoint", &pid_params.setpoint},
254 {"p_gain_pct", &pid_params.p_gain_pct},
258 static struct dentry *debugfs_parent;
259 static void intel_pstate_debug_expose_params(void)
263 debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
264 if (IS_ERR_OR_NULL(debugfs_parent))
266 while (pid_files[i].name) {
267 debugfs_create_file(pid_files[i].name, 0660,
268 debugfs_parent, pid_files[i].value,
274 /************************** debugfs end ************************/
276 /************************** sysfs begin ************************/
277 #define show_one(file_name, object) \
278 static ssize_t show_##file_name \
279 (struct kobject *kobj, struct attribute *attr, char *buf) \
281 return sprintf(buf, "%u\n", limits.object); \
284 static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
285 const char *buf, size_t count)
289 ret = sscanf(buf, "%u", &input);
292 limits.no_turbo = clamp_t(int, input, 0 , 1);
297 static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
298 const char *buf, size_t count)
302 ret = sscanf(buf, "%u", &input);
306 limits.max_sysfs_pct = clamp_t(int, input, 0 , 100);
307 limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
308 limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
312 static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
313 const char *buf, size_t count)
317 ret = sscanf(buf, "%u", &input);
320 limits.min_perf_pct = clamp_t(int, input, 0 , 100);
321 limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
326 show_one(no_turbo, no_turbo);
327 show_one(max_perf_pct, max_perf_pct);
328 show_one(min_perf_pct, min_perf_pct);
330 define_one_global_rw(no_turbo);
331 define_one_global_rw(max_perf_pct);
332 define_one_global_rw(min_perf_pct);
334 static struct attribute *intel_pstate_attributes[] = {
341 static struct attribute_group intel_pstate_attr_group = {
342 .attrs = intel_pstate_attributes,
344 static struct kobject *intel_pstate_kobject;
346 static void intel_pstate_sysfs_expose_params(void)
350 intel_pstate_kobject = kobject_create_and_add("intel_pstate",
351 &cpu_subsys.dev_root->kobj);
352 BUG_ON(!intel_pstate_kobject);
353 rc = sysfs_create_group(intel_pstate_kobject,
354 &intel_pstate_attr_group);
358 /************************** sysfs end ************************/
359 static int byt_get_min_pstate(void)
362 rdmsrl(BYT_RATIOS, value);
363 return (value >> 8) & 0x3F;
366 static int byt_get_max_pstate(void)
369 rdmsrl(BYT_RATIOS, value);
370 return (value >> 16) & 0x3F;
373 static int byt_get_turbo_pstate(void)
376 rdmsrl(BYT_TURBO_RATIOS, value);
380 static void byt_set_pstate(struct cpudata *cpudata, int pstate)
390 vid_fp = cpudata->vid.min + mul_fp(
391 int_tofp(pstate - cpudata->pstate.min_pstate),
394 vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
395 vid = fp_toint(vid_fp);
397 if (pstate > cpudata->pstate.max_pstate)
398 vid = cpudata->vid.turbo;
402 wrmsrl(MSR_IA32_PERF_CTL, val);
405 static void byt_get_vid(struct cpudata *cpudata)
410 rdmsrl(BYT_VIDS, value);
411 cpudata->vid.min = int_tofp((value >> 8) & 0x3f);
412 cpudata->vid.max = int_tofp((value >> 16) & 0x3f);
413 cpudata->vid.ratio = div_fp(
414 cpudata->vid.max - cpudata->vid.min,
415 int_tofp(cpudata->pstate.max_pstate -
416 cpudata->pstate.min_pstate));
418 rdmsrl(BYT_TURBO_VIDS, value);
419 cpudata->vid.turbo = value & 0x7f;
423 static int core_get_min_pstate(void)
426 rdmsrl(MSR_PLATFORM_INFO, value);
427 return (value >> 40) & 0xFF;
430 static int core_get_max_pstate(void)
433 rdmsrl(MSR_PLATFORM_INFO, value);
434 return (value >> 8) & 0xFF;
437 static int core_get_turbo_pstate(void)
441 rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
442 nont = core_get_max_pstate();
443 ret = ((value) & 255);
449 static void core_set_pstate(struct cpudata *cpudata, int pstate)
457 wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
460 static struct cpu_defaults core_params = {
462 .sample_rate_ms = 10,
470 .get_max = core_get_max_pstate,
471 .get_min = core_get_min_pstate,
472 .get_turbo = core_get_turbo_pstate,
473 .set = core_set_pstate,
477 static struct cpu_defaults byt_params = {
479 .sample_rate_ms = 10,
487 .get_max = byt_get_max_pstate,
488 .get_min = byt_get_min_pstate,
489 .get_turbo = byt_get_turbo_pstate,
490 .set = byt_set_pstate,
491 .get_vid = byt_get_vid,
496 static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
498 int max_perf = cpu->pstate.turbo_pstate;
502 max_perf = cpu->pstate.max_pstate;
504 max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
505 *max = clamp_t(int, max_perf_adj,
506 cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
508 min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf));
509 *min = clamp_t(int, min_perf,
510 cpu->pstate.min_pstate, max_perf);
513 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
515 int max_perf, min_perf;
517 intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
519 pstate = clamp_t(int, pstate, min_perf, max_perf);
521 if (pstate == cpu->pstate.current_pstate)
524 trace_cpu_frequency(pstate * 100000, cpu->cpu);
526 cpu->pstate.current_pstate = pstate;
528 pstate_funcs.set(cpu, pstate);
531 static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
534 target = cpu->pstate.current_pstate + steps;
536 intel_pstate_set_pstate(cpu, target);
539 static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps)
542 target = cpu->pstate.current_pstate - steps;
543 intel_pstate_set_pstate(cpu, target);
546 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
548 cpu->pstate.min_pstate = pstate_funcs.get_min();
549 cpu->pstate.max_pstate = pstate_funcs.get_max();
550 cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
552 if (pstate_funcs.get_vid)
553 pstate_funcs.get_vid(cpu);
554 intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
557 static inline void intel_pstate_calc_busy(struct cpudata *cpu)
559 struct sample *sample = &cpu->sample;
563 core_pct = int_tofp(sample->aperf) * int_tofp(100);
564 core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem);
566 if ((rem << 1) >= int_tofp(sample->mperf))
569 sample->freq = fp_toint(
570 mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));
572 sample->core_pct_busy = (int32_t)core_pct;
575 static inline void intel_pstate_sample(struct cpudata *cpu)
579 rdmsrl(MSR_IA32_APERF, aperf);
580 rdmsrl(MSR_IA32_MPERF, mperf);
582 aperf = aperf >> FRAC_BITS;
583 mperf = mperf >> FRAC_BITS;
585 cpu->last_sample_time = cpu->sample.time;
586 cpu->sample.time = ktime_get();
587 cpu->sample.aperf = aperf;
588 cpu->sample.mperf = mperf;
589 cpu->sample.aperf -= cpu->prev_aperf;
590 cpu->sample.mperf -= cpu->prev_mperf;
592 intel_pstate_calc_busy(cpu);
594 cpu->prev_aperf = aperf;
595 cpu->prev_mperf = mperf;
598 static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
600 int sample_time, delay;
602 sample_time = pid_params.sample_rate_ms;
603 delay = msecs_to_jiffies(sample_time);
604 mod_timer_pinned(&cpu->timer, jiffies + delay);
607 static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
609 int32_t core_busy, max_pstate, current_pstate, sample_ratio;
613 core_busy = cpu->sample.core_pct_busy;
614 max_pstate = int_tofp(cpu->pstate.max_pstate);
615 current_pstate = int_tofp(cpu->pstate.current_pstate);
616 core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
618 sample_time = (pid_params.sample_rate_ms * USEC_PER_MSEC);
619 duration_us = (u32) ktime_us_delta(cpu->sample.time,
620 cpu->last_sample_time);
621 if (duration_us > sample_time * 3) {
622 sample_ratio = div_fp(int_tofp(sample_time),
623 int_tofp(duration_us));
624 core_busy = mul_fp(core_busy, sample_ratio);
630 static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
638 busy_scaled = intel_pstate_get_scaled_busy(cpu);
640 ctl = pid_calc(pid, busy_scaled);
645 intel_pstate_pstate_increase(cpu, steps);
647 intel_pstate_pstate_decrease(cpu, steps);
650 static void intel_pstate_timer_func(unsigned long __data)
652 struct cpudata *cpu = (struct cpudata *) __data;
653 struct sample *sample;
655 intel_pstate_sample(cpu);
657 sample = &cpu->sample;
659 intel_pstate_adjust_busy_pstate(cpu);
661 trace_pstate_sample(fp_toint(sample->core_pct_busy),
662 fp_toint(intel_pstate_get_scaled_busy(cpu)),
663 cpu->pstate.current_pstate,
668 intel_pstate_set_sample_time(cpu);
671 #define ICPU(model, policy) \
672 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
673 (unsigned long)&policy }
675 static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
676 ICPU(0x2a, core_params),
677 ICPU(0x2d, core_params),
678 ICPU(0x37, byt_params),
679 ICPU(0x3a, core_params),
680 ICPU(0x3c, core_params),
681 ICPU(0x3d, core_params),
682 ICPU(0x3e, core_params),
683 ICPU(0x3f, core_params),
684 ICPU(0x45, core_params),
685 ICPU(0x46, core_params),
686 ICPU(0x4f, core_params),
687 ICPU(0x56, core_params),
690 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
692 static int intel_pstate_init_cpu(unsigned int cpunum)
695 const struct x86_cpu_id *id;
698 id = x86_match_cpu(intel_pstate_cpu_ids);
702 all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL);
703 if (!all_cpu_data[cpunum])
706 cpu = all_cpu_data[cpunum];
708 intel_pstate_get_cpu_pstates(cpu);
712 init_timer_deferrable(&cpu->timer);
713 cpu->timer.function = intel_pstate_timer_func;
716 cpu->timer.expires = jiffies + HZ/100;
717 intel_pstate_busy_pid_reset(cpu);
718 intel_pstate_sample(cpu);
720 add_timer_on(&cpu->timer, cpunum);
722 pr_info("Intel pstate controlling: cpu %d\n", cpunum);
727 static unsigned int intel_pstate_get(unsigned int cpu_num)
729 struct sample *sample;
732 cpu = all_cpu_data[cpu_num];
735 sample = &cpu->sample;
739 static int intel_pstate_set_policy(struct cpufreq_policy *policy)
743 cpu = all_cpu_data[policy->cpu];
745 if (!policy->cpuinfo.max_freq)
748 if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
749 limits.min_perf_pct = 100;
750 limits.min_perf = int_tofp(1);
751 limits.max_perf_pct = 100;
752 limits.max_perf = int_tofp(1);
756 limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
757 limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
758 limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
760 limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq;
761 limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100);
762 limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
763 limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
768 static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
770 cpufreq_verify_within_cpu_limits(policy);
772 if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
773 (policy->policy != CPUFREQ_POLICY_PERFORMANCE))
779 static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
781 int cpu_num = policy->cpu;
782 struct cpudata *cpu = all_cpu_data[cpu_num];
784 pr_info("intel_pstate CPU %d exiting\n", cpu_num);
786 del_timer_sync(&all_cpu_data[cpu_num]->timer);
787 intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
788 kfree(all_cpu_data[cpu_num]);
789 all_cpu_data[cpu_num] = NULL;
792 static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
797 rc = intel_pstate_init_cpu(policy->cpu);
801 cpu = all_cpu_data[policy->cpu];
803 if (!limits.no_turbo &&
804 limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
805 policy->policy = CPUFREQ_POLICY_PERFORMANCE;
807 policy->policy = CPUFREQ_POLICY_POWERSAVE;
809 policy->min = cpu->pstate.min_pstate * 100000;
810 policy->max = cpu->pstate.turbo_pstate * 100000;
812 /* cpuinfo and default policy values */
813 policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000;
814 policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000;
815 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
816 cpumask_set_cpu(policy->cpu, policy->cpus);
821 static struct cpufreq_driver intel_pstate_driver = {
822 .flags = CPUFREQ_CONST_LOOPS,
823 .verify = intel_pstate_verify_policy,
824 .setpolicy = intel_pstate_set_policy,
825 .get = intel_pstate_get,
826 .init = intel_pstate_cpu_init,
827 .stop_cpu = intel_pstate_stop_cpu,
828 .name = "intel_pstate",
831 static int __initdata no_load;
833 static int intel_pstate_msrs_not_valid(void)
835 /* Check that all the msr's we are using are valid. */
836 u64 aperf, mperf, tmp;
838 rdmsrl(MSR_IA32_APERF, aperf);
839 rdmsrl(MSR_IA32_MPERF, mperf);
841 if (!pstate_funcs.get_max() ||
842 !pstate_funcs.get_min() ||
843 !pstate_funcs.get_turbo())
846 rdmsrl(MSR_IA32_APERF, tmp);
850 rdmsrl(MSR_IA32_MPERF, tmp);
857 static void copy_pid_params(struct pstate_adjust_policy *policy)
859 pid_params.sample_rate_ms = policy->sample_rate_ms;
860 pid_params.p_gain_pct = policy->p_gain_pct;
861 pid_params.i_gain_pct = policy->i_gain_pct;
862 pid_params.d_gain_pct = policy->d_gain_pct;
863 pid_params.deadband = policy->deadband;
864 pid_params.setpoint = policy->setpoint;
867 static void copy_cpu_funcs(struct pstate_funcs *funcs)
869 pstate_funcs.get_max = funcs->get_max;
870 pstate_funcs.get_min = funcs->get_min;
871 pstate_funcs.get_turbo = funcs->get_turbo;
872 pstate_funcs.set = funcs->set;
873 pstate_funcs.get_vid = funcs->get_vid;
876 #if IS_ENABLED(CONFIG_ACPI)
877 #include <acpi/processor.h>
879 static bool intel_pstate_no_acpi_pss(void)
883 for_each_possible_cpu(i) {
885 union acpi_object *pss;
886 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
887 struct acpi_processor *pr = per_cpu(processors, i);
892 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
893 if (ACPI_FAILURE(status))
896 pss = buffer.pointer;
897 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
908 struct hw_vendor_info {
910 char oem_id[ACPI_OEM_ID_SIZE];
911 char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
914 /* Hardware vendor-specific info that has its own power management modes */
915 static struct hw_vendor_info vendor_info[] = {
916 {1, "HP ", "ProLiant"},
920 static bool intel_pstate_platform_pwr_mgmt_exists(void)
922 struct acpi_table_header hdr;
923 struct hw_vendor_info *v_info;
926 || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
929 for (v_info = vendor_info; v_info->valid; v_info++) {
930 if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE)
931 && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)
932 && intel_pstate_no_acpi_pss())
938 #else /* CONFIG_ACPI not enabled */
939 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
940 #endif /* CONFIG_ACPI */
942 static int __init intel_pstate_init(void)
945 const struct x86_cpu_id *id;
946 struct cpu_defaults *cpu_info;
951 id = x86_match_cpu(intel_pstate_cpu_ids);
956 * The Intel pstate driver will be ignored if the platform
957 * firmware has its own power management modes.
959 if (intel_pstate_platform_pwr_mgmt_exists())
962 cpu_info = (struct cpu_defaults *)id->driver_data;
964 copy_pid_params(&cpu_info->pid_policy);
965 copy_cpu_funcs(&cpu_info->funcs);
967 if (intel_pstate_msrs_not_valid())
970 pr_info("Intel P-state driver initializing.\n");
972 all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus());
976 rc = cpufreq_register_driver(&intel_pstate_driver);
980 intel_pstate_debug_expose_params();
981 intel_pstate_sysfs_expose_params();
986 for_each_online_cpu(cpu) {
987 if (all_cpu_data[cpu]) {
988 del_timer_sync(&all_cpu_data[cpu]->timer);
989 kfree(all_cpu_data[cpu]);
997 device_initcall(intel_pstate_init);
999 static int __init intel_pstate_setup(char *str)
1004 if (!strcmp(str, "disable"))
1008 early_param("intel_pstate", intel_pstate_setup);
1010 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
1011 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
1012 MODULE_LICENSE("GPL");