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linux/drivers/cpufreq/intel_pstate.c
Dirk Brandewie d3929b8328 cpufreq / intel_pstate: Do not load on VM that does not report max P state.
It seems some VMs support the P state MSRs but return zeros. Fail
gracefully if we are running in this environment.

References: https://bugzilla.redhat.com/show_bug.cgi?id=916833
Reported-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-06 23:40:11 +01:00

810 lines
19 KiB
C

/*
* 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 = div_s64((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];
if (!policy->cpuinfo.max_freq)
return -ENODEV;
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 int __initdata no_load;
static int __init intel_pstate_init(void)
{
int cpu, rc = 0;
const struct x86_cpu_id *id;
if (no_load)
return -ENODEV;
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:
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);
return -ENODEV;
}
device_initcall(intel_pstate_init);
static int __init intel_pstate_setup(char *str)
{
if (!str)
return -EINVAL;
if (!strcmp(str, "disable"))
no_load = 1;
return 0;
}
early_param("intel_pstate", intel_pstate_setup);
MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
MODULE_LICENSE("GPL");