--- /dev/null
+/*
+ * cpufreq_snb.c: Native P state management for Intel processors
+ *
+ * (C) Copyright 2012 Intel Corporation
+ * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/ktime.h>
+#include <linux/hrtimer.h>
+#include <linux/tick.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <trace/events/power.h>
+
+#include <asm/div64.h>
+#include <asm/msr.h>
+#include <asm/cpu_device_id.h>
+
+#define SAMPLE_COUNT 3
+
+#define FRAC_BITS 8
+#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
+#define fp_toint(X) ((X) >> FRAC_BITS)
+
+static inline int32_t mul_fp(int32_t x, int32_t y)
+{
+ return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
+}
+
+static inline int32_t div_fp(int32_t x, int32_t y)
+{
+ return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
+}
+
+struct sample {
+ ktime_t start_time;
+ ktime_t end_time;
+ int core_pct_busy;
+ int pstate_pct_busy;
+ u64 duration_us;
+ u64 idletime_us;
+ u64 aperf;
+ u64 mperf;
+ int freq;
+};
+
+struct pstate_data {
+ int current_pstate;
+ int min_pstate;
+ int max_pstate;
+ int turbo_pstate;
+};
+
+struct _pid {
+ int setpoint;
+ int32_t integral;
+ int32_t p_gain;
+ int32_t i_gain;
+ int32_t d_gain;
+ int deadband;
+ int last_err;
+};
+
+struct cpudata {
+ int cpu;
+
+ char name[64];
+
+ struct timer_list timer;
+
+ struct pstate_adjust_policy *pstate_policy;
+ struct pstate_data pstate;
+ struct _pid pid;
+ struct _pid idle_pid;
+
+ int min_pstate_count;
+ int idle_mode;
+
+ ktime_t prev_sample;
+ u64 prev_idle_time_us;
+ u64 prev_aperf;
+ u64 prev_mperf;
+ int sample_ptr;
+ struct sample samples[SAMPLE_COUNT];
+};
+
+static struct cpudata **all_cpu_data;
+struct pstate_adjust_policy {
+ int sample_rate_ms;
+ int deadband;
+ int setpoint;
+ int p_gain_pct;
+ int d_gain_pct;
+ int i_gain_pct;
+};
+
+static struct pstate_adjust_policy default_policy = {
+ .sample_rate_ms = 10,
+ .deadband = 0,
+ .setpoint = 109,
+ .p_gain_pct = 17,
+ .d_gain_pct = 0,
+ .i_gain_pct = 4,
+};
+
+struct perf_limits {
+ int no_turbo;
+ int max_perf_pct;
+ int min_perf_pct;
+ int32_t max_perf;
+ int32_t min_perf;
+};
+
+static struct perf_limits limits = {
+ .no_turbo = 0,
+ .max_perf_pct = 100,
+ .max_perf = int_tofp(1),
+ .min_perf_pct = 0,
+ .min_perf = 0,
+};
+
+static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
+ int deadband, int integral) {
+ pid->setpoint = setpoint;
+ pid->deadband = deadband;
+ pid->integral = int_tofp(integral);
+ pid->last_err = setpoint - busy;
+}
+
+static inline void pid_p_gain_set(struct _pid *pid, int percent)
+{
+ pid->p_gain = div_fp(int_tofp(percent), int_tofp(100));
+}
+
+static inline void pid_i_gain_set(struct _pid *pid, int percent)
+{
+ pid->i_gain = div_fp(int_tofp(percent), int_tofp(100));
+}
+
+static inline void pid_d_gain_set(struct _pid *pid, int percent)
+{
+
+ pid->d_gain = div_fp(int_tofp(percent), int_tofp(100));
+}
+
+static signed int pid_calc(struct _pid *pid, int busy)
+{
+ signed int err, result;
+ int32_t pterm, dterm, fp_error;
+ int32_t integral_limit;
+
+ err = pid->setpoint - busy;
+ fp_error = int_tofp(err);
+
+ if (abs(err) <= pid->deadband)
+ return 0;
+
+ pterm = mul_fp(pid->p_gain, fp_error);
+
+ pid->integral += fp_error;
+
+ /* limit the integral term */
+ integral_limit = int_tofp(30);
+ if (pid->integral > integral_limit)
+ pid->integral = integral_limit;
+ if (pid->integral < -integral_limit)
+ pid->integral = -integral_limit;
+
+ dterm = mul_fp(pid->d_gain, (err - pid->last_err));
+ pid->last_err = err;
+
+ result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm;
+
+ return (signed int)fp_toint(result);
+}
+
+static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
+{
+ pid_p_gain_set(&cpu->pid, cpu->pstate_policy->p_gain_pct);
+ pid_d_gain_set(&cpu->pid, cpu->pstate_policy->d_gain_pct);
+ pid_i_gain_set(&cpu->pid, cpu->pstate_policy->i_gain_pct);
+
+ pid_reset(&cpu->pid,
+ cpu->pstate_policy->setpoint,
+ 100,
+ cpu->pstate_policy->deadband,
+ 0);
+}
+
+static inline void intel_pstate_idle_pid_reset(struct cpudata *cpu)
+{
+ pid_p_gain_set(&cpu->idle_pid, cpu->pstate_policy->p_gain_pct);
+ pid_d_gain_set(&cpu->idle_pid, cpu->pstate_policy->d_gain_pct);
+ pid_i_gain_set(&cpu->idle_pid, cpu->pstate_policy->i_gain_pct);
+
+ pid_reset(&cpu->idle_pid,
+ 75,
+ 50,
+ cpu->pstate_policy->deadband,
+ 0);
+}
+
+static inline void intel_pstate_reset_all_pid(void)
+{
+ unsigned int cpu;
+ for_each_online_cpu(cpu) {
+ if (all_cpu_data[cpu])
+ intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
+ }
+}
+
+/************************** debugfs begin ************************/
+static int pid_param_set(void *data, u64 val)
+{
+ *(u32 *)data = val;
+ intel_pstate_reset_all_pid();
+ return 0;
+}
+static int pid_param_get(void *data, u64 *val)
+{
+ *val = *(u32 *)data;
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get,
+ pid_param_set, "%llu\n");
+
+struct pid_param {
+ char *name;
+ void *value;
+};
+
+static struct pid_param pid_files[] = {
+ {"sample_rate_ms", &default_policy.sample_rate_ms},
+ {"d_gain_pct", &default_policy.d_gain_pct},
+ {"i_gain_pct", &default_policy.i_gain_pct},
+ {"deadband", &default_policy.deadband},
+ {"setpoint", &default_policy.setpoint},
+ {"p_gain_pct", &default_policy.p_gain_pct},
+ {NULL, NULL}
+};
+
+static struct dentry *debugfs_parent;
+static void intel_pstate_debug_expose_params(void)
+{
+ int i = 0;
+
+ debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
+ if (IS_ERR_OR_NULL(debugfs_parent))
+ return;
+ while (pid_files[i].name) {
+ debugfs_create_file(pid_files[i].name, 0660,
+ debugfs_parent, pid_files[i].value,
+ &fops_pid_param);
+ i++;
+ }
+}
+
+/************************** debugfs end ************************/
+
+/************************** sysfs begin ************************/
+#define show_one(file_name, object) \
+ static ssize_t show_##file_name \
+ (struct kobject *kobj, struct attribute *attr, char *buf) \
+ { \
+ return sprintf(buf, "%u\n", limits.object); \
+ }
+
+static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf(buf, "%u", &input);
+ if (ret != 1)
+ return -EINVAL;
+ limits.no_turbo = clamp_t(int, input, 0 , 1);
+
+ return count;
+}
+
+static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf(buf, "%u", &input);
+ if (ret != 1)
+ return -EINVAL;
+
+ limits.max_perf_pct = clamp_t(int, input, 0 , 100);
+ limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
+ return count;
+}
+
+static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
+ const char *buf, size_t count)
+{
+ unsigned int input;
+ int ret;
+ ret = sscanf(buf, "%u", &input);
+ if (ret != 1)
+ return -EINVAL;
+ limits.min_perf_pct = clamp_t(int, input, 0 , 100);
+ limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
+
+ return count;
+}
+
+show_one(no_turbo, no_turbo);
+show_one(max_perf_pct, max_perf_pct);
+show_one(min_perf_pct, min_perf_pct);
+
+define_one_global_rw(no_turbo);
+define_one_global_rw(max_perf_pct);
+define_one_global_rw(min_perf_pct);
+
+static struct attribute *intel_pstate_attributes[] = {
+ &no_turbo.attr,
+ &max_perf_pct.attr,
+ &min_perf_pct.attr,
+ NULL
+};
+
+static struct attribute_group intel_pstate_attr_group = {
+ .attrs = intel_pstate_attributes,
+};
+static struct kobject *intel_pstate_kobject;
+
+static void intel_pstate_sysfs_expose_params(void)
+{
+ int rc;
+
+ intel_pstate_kobject = kobject_create_and_add("intel_pstate",
+ &cpu_subsys.dev_root->kobj);
+ BUG_ON(!intel_pstate_kobject);
+ rc = sysfs_create_group(intel_pstate_kobject,
+ &intel_pstate_attr_group);
+ BUG_ON(rc);
+}
+
+/************************** sysfs end ************************/
+
+static int intel_pstate_min_pstate(void)
+{
+ u64 value;
+ rdmsrl(0xCE, value);
+ return (value >> 40) & 0xFF;
+}
+
+static int intel_pstate_max_pstate(void)
+{
+ u64 value;
+ rdmsrl(0xCE, value);
+ return (value >> 8) & 0xFF;
+}
+
+static int intel_pstate_turbo_pstate(void)
+{
+ u64 value;
+ int nont, ret;
+ rdmsrl(0x1AD, value);
+ nont = intel_pstate_max_pstate();
+ ret = ((value) & 255);
+ if (ret <= nont)
+ ret = nont;
+ return ret;
+}
+
+static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
+{
+ int max_perf = cpu->pstate.turbo_pstate;
+ int min_perf;
+ if (limits.no_turbo)
+ max_perf = cpu->pstate.max_pstate;
+
+ max_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
+ *max = clamp_t(int, max_perf,
+ cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
+
+ min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf));
+ *min = clamp_t(int, min_perf,
+ cpu->pstate.min_pstate, max_perf);
+}
+
+static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
+{
+ int max_perf, min_perf;
+
+ intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
+
+ pstate = clamp_t(int, pstate, min_perf, max_perf);
+
+ if (pstate == cpu->pstate.current_pstate)
+ return;
+
+#ifndef MODULE
+ trace_cpu_frequency(pstate * 100000, cpu->cpu);
+#endif
+ cpu->pstate.current_pstate = pstate;
+ wrmsrl(MSR_IA32_PERF_CTL, pstate << 8);
+
+}
+
+static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
+{
+ int target;
+ target = cpu->pstate.current_pstate + steps;
+
+ intel_pstate_set_pstate(cpu, target);
+}
+
+static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps)
+{
+ int target;
+ target = cpu->pstate.current_pstate - steps;
+ intel_pstate_set_pstate(cpu, target);
+}
+
+static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
+{
+ sprintf(cpu->name, "Intel 2nd generation core");
+
+ cpu->pstate.min_pstate = intel_pstate_min_pstate();
+ cpu->pstate.max_pstate = intel_pstate_max_pstate();
+ cpu->pstate.turbo_pstate = intel_pstate_turbo_pstate();
+
+ /*
+ * goto max pstate so we don't slow up boot if we are built-in if we are
+ * a module we will take care of it during normal operation
+ */
+ intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
+}
+
+static inline void intel_pstate_calc_busy(struct cpudata *cpu,
+ struct sample *sample)
+{
+ u64 core_pct;
+ sample->pstate_pct_busy = 100 - div64_u64(
+ sample->idletime_us * 100,
+ sample->duration_us);
+ core_pct = div64_u64(sample->aperf * 100, sample->mperf);
+ sample->freq = cpu->pstate.turbo_pstate * core_pct * 1000;
+
+ sample->core_pct_busy = sample->pstate_pct_busy * core_pct / 100;
+}
+
+static inline void intel_pstate_sample(struct cpudata *cpu)
+{
+ ktime_t now;
+ u64 idle_time_us;
+ u64 aperf, mperf;
+
+ now = ktime_get();
+ idle_time_us = get_cpu_idle_time_us(cpu->cpu, NULL);
+
+ rdmsrl(MSR_IA32_APERF, aperf);
+ rdmsrl(MSR_IA32_MPERF, mperf);
+ /* for the first sample, don't actually record a sample, just
+ * set the baseline */
+ if (cpu->prev_idle_time_us > 0) {
+ cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
+ cpu->samples[cpu->sample_ptr].start_time = cpu->prev_sample;
+ cpu->samples[cpu->sample_ptr].end_time = now;
+ cpu->samples[cpu->sample_ptr].duration_us =
+ ktime_us_delta(now, cpu->prev_sample);
+ cpu->samples[cpu->sample_ptr].idletime_us =
+ idle_time_us - cpu->prev_idle_time_us;
+
+ cpu->samples[cpu->sample_ptr].aperf = aperf;
+ cpu->samples[cpu->sample_ptr].mperf = mperf;
+ cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;
+ cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
+
+ intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
+ }
+
+ cpu->prev_sample = now;
+ cpu->prev_idle_time_us = idle_time_us;
+ cpu->prev_aperf = aperf;
+ cpu->prev_mperf = mperf;
+}
+
+static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
+{
+ int sample_time, delay;
+
+ sample_time = cpu->pstate_policy->sample_rate_ms;
+ delay = msecs_to_jiffies(sample_time);
+ delay -= jiffies % delay;
+ mod_timer_pinned(&cpu->timer, jiffies + delay);
+}
+
+static inline void intel_pstate_idle_mode(struct cpudata *cpu)
+{
+ cpu->idle_mode = 1;
+}
+
+static inline void intel_pstate_normal_mode(struct cpudata *cpu)
+{
+ cpu->idle_mode = 0;
+}
+
+static inline int intel_pstate_get_scaled_busy(struct cpudata *cpu)
+{
+ int32_t busy_scaled;
+ int32_t core_busy, turbo_pstate, current_pstate;
+
+ core_busy = int_tofp(cpu->samples[cpu->sample_ptr].core_pct_busy);
+ turbo_pstate = int_tofp(cpu->pstate.turbo_pstate);
+ current_pstate = int_tofp(cpu->pstate.current_pstate);
+ busy_scaled = mul_fp(core_busy, div_fp(turbo_pstate, current_pstate));
+
+ return fp_toint(busy_scaled);
+}
+
+static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
+{
+ int busy_scaled;
+ struct _pid *pid;
+ signed int ctl = 0;
+ int steps;
+
+ pid = &cpu->pid;
+ busy_scaled = intel_pstate_get_scaled_busy(cpu);
+
+ ctl = pid_calc(pid, busy_scaled);
+
+ steps = abs(ctl);
+ if (ctl < 0)
+ intel_pstate_pstate_increase(cpu, steps);
+ else
+ intel_pstate_pstate_decrease(cpu, steps);
+}
+
+static inline void intel_pstate_adjust_idle_pstate(struct cpudata *cpu)
+{
+ int busy_scaled;
+ struct _pid *pid;
+ int ctl = 0;
+ int steps;
+
+ pid = &cpu->idle_pid;
+
+ busy_scaled = intel_pstate_get_scaled_busy(cpu);
+
+ ctl = pid_calc(pid, 100 - busy_scaled);
+
+ steps = abs(ctl);
+ if (ctl < 0)
+ intel_pstate_pstate_decrease(cpu, steps);
+ else
+ intel_pstate_pstate_increase(cpu, steps);
+
+ if (cpu->pstate.current_pstate == cpu->pstate.min_pstate)
+ intel_pstate_normal_mode(cpu);
+}
+
+static void intel_pstate_timer_func(unsigned long __data)
+{
+ struct cpudata *cpu = (struct cpudata *) __data;
+
+ intel_pstate_sample(cpu);
+
+ if (!cpu->idle_mode)
+ intel_pstate_adjust_busy_pstate(cpu);
+ else
+ intel_pstate_adjust_idle_pstate(cpu);
+
+#if defined(XPERF_FIX)
+ if (cpu->pstate.current_pstate == cpu->pstate.min_pstate) {
+ cpu->min_pstate_count++;
+ if (!(cpu->min_pstate_count % 5)) {
+ intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
+ intel_pstate_idle_mode(cpu);
+ }
+ } else
+ cpu->min_pstate_count = 0;
+#endif
+ intel_pstate_set_sample_time(cpu);
+}
+
+#define ICPU(model, policy) \
+ { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&policy }
+
+static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
+ ICPU(0x2a, default_policy),
+ ICPU(0x2d, default_policy),
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
+
+static int intel_pstate_init_cpu(unsigned int cpunum)
+{
+
+ const struct x86_cpu_id *id;
+ struct cpudata *cpu;
+
+ id = x86_match_cpu(intel_pstate_cpu_ids);
+ if (!id)
+ return -ENODEV;
+
+ all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL);
+ if (!all_cpu_data[cpunum])
+ return -ENOMEM;
+
+ cpu = all_cpu_data[cpunum];
+
+ intel_pstate_get_cpu_pstates(cpu);
+
+ cpu->cpu = cpunum;
+ cpu->pstate_policy =
+ (struct pstate_adjust_policy *)id->driver_data;
+ init_timer_deferrable(&cpu->timer);
+ cpu->timer.function = intel_pstate_timer_func;
+ cpu->timer.data =
+ (unsigned long)cpu;
+ cpu->timer.expires = jiffies + HZ/100;
+ intel_pstate_busy_pid_reset(cpu);
+ intel_pstate_idle_pid_reset(cpu);
+ intel_pstate_sample(cpu);
+ intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
+
+ add_timer_on(&cpu->timer, cpunum);
+
+ pr_info("Intel pstate controlling: cpu %d\n", cpunum);
+
+ return 0;
+}
+
+static unsigned int intel_pstate_get(unsigned int cpu_num)
+{
+ struct sample *sample;
+ struct cpudata *cpu;
+
+ cpu = all_cpu_data[cpu_num];
+ if (!cpu)
+ return 0;
+ sample = &cpu->samples[cpu->sample_ptr];
+ return sample->freq;
+}
+
+static int intel_pstate_set_policy(struct cpufreq_policy *policy)
+{
+ struct cpudata *cpu;
+ int min, max;
+
+ cpu = all_cpu_data[policy->cpu];
+
+ intel_pstate_get_min_max(cpu, &min, &max);
+
+ limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
+ limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
+ limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
+
+ limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq;
+ limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100);
+ limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
+
+ if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
+ limits.min_perf_pct = 100;
+ limits.min_perf = int_tofp(1);
+ limits.max_perf_pct = 100;
+ limits.max_perf = int_tofp(1);
+ limits.no_turbo = 0;
+ }
+
+ return 0;
+}
+
+static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
+{
+ cpufreq_verify_within_limits(policy,
+ policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
+ (policy->policy != CPUFREQ_POLICY_PERFORMANCE))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int __cpuinit intel_pstate_cpu_exit(struct cpufreq_policy *policy)
+{
+ int cpu = policy->cpu;
+
+ del_timer(&all_cpu_data[cpu]->timer);
+ kfree(all_cpu_data[cpu]);
+ all_cpu_data[cpu] = NULL;
+ return 0;
+}
+
+static int __cpuinit intel_pstate_cpu_init(struct cpufreq_policy *policy)
+{
+ int rc, min_pstate, max_pstate;
+ struct cpudata *cpu;
+
+ rc = intel_pstate_init_cpu(policy->cpu);
+ if (rc)
+ return rc;
+
+ cpu = all_cpu_data[policy->cpu];
+
+ if (!limits.no_turbo &&
+ limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
+ policy->policy = CPUFREQ_POLICY_PERFORMANCE;
+ else
+ policy->policy = CPUFREQ_POLICY_POWERSAVE;
+
+ intel_pstate_get_min_max(cpu, &min_pstate, &max_pstate);
+ policy->min = min_pstate * 100000;
+ policy->max = max_pstate * 100000;
+
+ /* cpuinfo and default policy values */
+ policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000;
+ policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000;
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+ cpumask_set_cpu(policy->cpu, policy->cpus);
+
+ return 0;
+}
+
+static struct cpufreq_driver intel_pstate_driver = {
+ .flags = CPUFREQ_CONST_LOOPS,
+ .verify = intel_pstate_verify_policy,
+ .setpolicy = intel_pstate_set_policy,
+ .get = intel_pstate_get,
+ .init = intel_pstate_cpu_init,
+ .exit = intel_pstate_cpu_exit,
+ .name = "intel_pstate",
+ .owner = THIS_MODULE,
+};
+
+static void intel_pstate_exit(void)
+{
+ int cpu;
+
+ sysfs_remove_group(intel_pstate_kobject,
+ &intel_pstate_attr_group);
+ debugfs_remove_recursive(debugfs_parent);
+
+ cpufreq_unregister_driver(&intel_pstate_driver);
+
+ if (!all_cpu_data)
+ return;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ if (all_cpu_data[cpu]) {
+ del_timer_sync(&all_cpu_data[cpu]->timer);
+ kfree(all_cpu_data[cpu]);
+ }
+ }
+
+ put_online_cpus();
+ vfree(all_cpu_data);
+}
+module_exit(intel_pstate_exit);
+
+static int __init intel_pstate_init(void)
+{
+ int rc = 0;
+ const struct x86_cpu_id *id;
+
+ id = x86_match_cpu(intel_pstate_cpu_ids);
+ if (!id)
+ return -ENODEV;
+
+ pr_info("Intel P-state driver initializing.\n");
+
+ all_cpu_data = vmalloc(sizeof(void *) * num_possible_cpus());
+ if (!all_cpu_data)
+ return -ENOMEM;
+ memset(all_cpu_data, 0, sizeof(void *) * num_possible_cpus());
+
+ rc = cpufreq_register_driver(&intel_pstate_driver);
+ if (rc)
+ goto out;
+
+ intel_pstate_debug_expose_params();
+ intel_pstate_sysfs_expose_params();
+ return rc;
+out:
+ intel_pstate_exit();
+ return -ENODEV;
+}
+device_initcall(intel_pstate_init);
+
+MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
+MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
+MODULE_LICENSE("GPL");
projects / kernel / kernel-generic.git / commitdiff