OpenCloudOS-Kernel/drivers/cpufreq/intel_pstate.c

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/*
* intel_pstate.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>
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
#include <linux/acpi.h>
#include <trace/events/power.h>
#include <asm/div64.h>
#include <asm/msr.h>
#include <asm/cpu_device_id.h>
#define BYT_RATIOS 0x66a
#define BYT_VIDS 0x66b
#define BYT_TURBO_RATIOS 0x66c
#define BYT_TURBO_VIDS 0x66d
#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, y);
}
static inline int ceiling_fp(int32_t x)
{
int mask, ret;
ret = fp_toint(x);
mask = (1 << FRAC_BITS) - 1;
if (x & mask)
ret += 1;
return ret;
}
struct sample {
int32_t core_pct_busy;
u64 aperf;
u64 mperf;
int freq;
ktime_t time;
};
struct pstate_data {
int current_pstate;
int min_pstate;
int max_pstate;
int scaling;
int turbo_pstate;
};
struct vid_data {
int min;
int max;
int turbo;
int32_t ratio;
};
struct _pid {
int setpoint;
int32_t integral;
int32_t p_gain;
int32_t i_gain;
int32_t d_gain;
int deadband;
int32_t last_err;
};
struct cpudata {
int cpu;
struct timer_list timer;
struct pstate_data pstate;
struct vid_data vid;
struct _pid pid;
ktime_t last_sample_time;
u64 prev_aperf;
u64 prev_mperf;
struct sample sample;
};
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;
};
struct pstate_funcs {
int (*get_max)(void);
int (*get_min)(void);
int (*get_turbo)(void);
int (*get_scaling)(void);
void (*set)(struct cpudata*, int pstate);
void (*get_vid)(struct cpudata *);
};
struct cpu_defaults {
struct pstate_adjust_policy pid_policy;
struct pstate_funcs funcs;
};
static struct pstate_adjust_policy pid_params;
static struct pstate_funcs pstate_funcs;
static int hwp_active;
struct perf_limits {
int no_turbo;
int turbo_disabled;
int max_perf_pct;
int min_perf_pct;
int32_t max_perf;
int32_t min_perf;
int max_policy_pct;
int max_sysfs_pct;
int min_policy_pct;
int min_sysfs_pct;
};
static struct perf_limits limits = {
.no_turbo = 0,
.turbo_disabled = 0,
.max_perf_pct = 100,
.max_perf = int_tofp(1),
.min_perf_pct = 0,
.min_perf = 0,
.max_policy_pct = 100,
.max_sysfs_pct = 100,
.min_policy_pct = 0,
.min_sysfs_pct = 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 = int_tofp(setpoint) - int_tofp(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, int32_t busy)
{
signed int result;
int32_t pterm, dterm, fp_error;
int32_t integral_limit;
fp_error = int_tofp(pid->setpoint) - busy;
if (abs(fp_error) <= int_tofp(pid->deadband))
return 0;
pterm = mul_fp(pid->p_gain, fp_error);
pid->integral += fp_error;
/*
* We limit the integral here so that it will never
* get higher than 30. This prevents it from becoming
* too large an input over long periods of time and allows
* it to get factored out sooner.
*
* The value of 30 was chosen through experimentation.
*/
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, fp_error - pid->last_err);
pid->last_err = fp_error;
result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm;
result = result + (1 << (FRAC_BITS-1));
return (signed int)fp_toint(result);
}
static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
{
pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct);
pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.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]);
}
}
static inline void update_turbo_state(void)
{
u64 misc_en;
struct cpudata *cpu;
cpu = all_cpu_data[0];
rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
limits.turbo_disabled =
(misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
}
#define PCT_TO_HWP(x) (x * 255 / 100)
static void intel_pstate_hwp_set(void)
{
int min, max, cpu;
u64 value, freq;
get_online_cpus();
for_each_online_cpu(cpu) {
rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
min = PCT_TO_HWP(limits.min_perf_pct);
value &= ~HWP_MIN_PERF(~0L);
value |= HWP_MIN_PERF(min);
max = PCT_TO_HWP(limits.max_perf_pct);
if (limits.no_turbo) {
rdmsrl( MSR_HWP_CAPABILITIES, freq);
max = HWP_GUARANTEED_PERF(freq);
}
value &= ~HWP_MAX_PERF(~0L);
value |= HWP_MAX_PERF(max);
wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
}
put_online_cpus();
}
/************************** 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", &pid_params.sample_rate_ms},
{"d_gain_pct", &pid_params.d_gain_pct},
{"i_gain_pct", &pid_params.i_gain_pct},
{"deadband", &pid_params.deadband},
{"setpoint", &pid_params.setpoint},
{"p_gain_pct", &pid_params.p_gain_pct},
{NULL, NULL}
};
static void __init intel_pstate_debug_expose_params(void)
{
struct dentry *debugfs_parent;
int i = 0;
if (hwp_active)
return;
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 show_turbo_pct(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct cpudata *cpu;
int total, no_turbo, turbo_pct;
uint32_t turbo_fp;
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total));
turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
return sprintf(buf, "%u\n", turbo_pct);
}
static ssize_t show_num_pstates(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct cpudata *cpu;
int total;
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
return sprintf(buf, "%u\n", total);
}
static ssize_t show_no_turbo(struct kobject *kobj,
struct attribute *attr, char *buf)
{
ssize_t ret;
update_turbo_state();
if (limits.turbo_disabled)
ret = sprintf(buf, "%u\n", limits.turbo_disabled);
else
ret = sprintf(buf, "%u\n", limits.no_turbo);
return ret;
}
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;
update_turbo_state();
if (limits.turbo_disabled) {
pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
return -EPERM;
}
limits.no_turbo = clamp_t(int, input, 0, 1);
if (hwp_active)
intel_pstate_hwp_set();
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_sysfs_pct = clamp_t(int, input, 0 , 100);
limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
if (hwp_active)
intel_pstate_hwp_set();
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_sysfs_pct = clamp_t(int, input, 0 , 100);
limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
if (hwp_active)
intel_pstate_hwp_set();
return count;
}
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);
define_one_global_ro(turbo_pct);
define_one_global_ro(num_pstates);
static struct attribute *intel_pstate_attributes[] = {
&no_turbo.attr,
&max_perf_pct.attr,
&min_perf_pct.attr,
&turbo_pct.attr,
&num_pstates.attr,
NULL
};
static struct attribute_group intel_pstate_attr_group = {
.attrs = intel_pstate_attributes,
};
static void __init intel_pstate_sysfs_expose_params(void)
{
struct kobject *intel_pstate_kobject;
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 void intel_pstate_hwp_enable(void)
{
hwp_active++;
pr_info("intel_pstate HWP enabled\n");
wrmsrl( MSR_PM_ENABLE, 0x1);
}
static int byt_get_min_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 8) & 0x7F;
}
static int byt_get_max_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 16) & 0x7F;
}
static int byt_get_turbo_pstate(void)
{
u64 value;
rdmsrl(BYT_TURBO_RATIOS, value);
return value & 0x7F;
}
static void byt_set_pstate(struct cpudata *cpudata, int pstate)
{
u64 val;
int32_t vid_fp;
u32 vid;
val = pstate << 8;
if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
vid_fp = cpudata->vid.min + mul_fp(
int_tofp(pstate - cpudata->pstate.min_pstate),
cpudata->vid.ratio);
vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
vid = ceiling_fp(vid_fp);
if (pstate > cpudata->pstate.max_pstate)
vid = cpudata->vid.turbo;
val |= vid;
wrmsrl(MSR_IA32_PERF_CTL, val);
}
#define BYT_BCLK_FREQS 5
static int byt_freq_table[BYT_BCLK_FREQS] = { 833, 1000, 1333, 1167, 800};
static int byt_get_scaling(void)
{
u64 value;
int i;
rdmsrl(MSR_FSB_FREQ, value);
i = value & 0x3;
BUG_ON(i > BYT_BCLK_FREQS);
return byt_freq_table[i] * 100;
}
static void byt_get_vid(struct cpudata *cpudata)
{
u64 value;
rdmsrl(BYT_VIDS, value);
cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
cpudata->vid.ratio = div_fp(
cpudata->vid.max - cpudata->vid.min,
int_tofp(cpudata->pstate.max_pstate -
cpudata->pstate.min_pstate));
rdmsrl(BYT_TURBO_VIDS, value);
cpudata->vid.turbo = value & 0x7f;
}
static int core_get_min_pstate(void)
{
u64 value;
rdmsrl(MSR_PLATFORM_INFO, value);
return (value >> 40) & 0xFF;
}
static int core_get_max_pstate(void)
{
u64 value;
rdmsrl(MSR_PLATFORM_INFO, value);
return (value >> 8) & 0xFF;
}
static int core_get_turbo_pstate(void)
{
u64 value;
int nont, ret;
rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
nont = core_get_max_pstate();
ret = (value) & 255;
if (ret <= nont)
ret = nont;
return ret;
}
static inline int core_get_scaling(void)
{
return 100000;
}
static void core_set_pstate(struct cpudata *cpudata, int pstate)
{
u64 val;
val = pstate << 8;
if (limits.no_turbo && !limits.turbo_disabled)
val |= (u64)1 << 32;
wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
}
static struct cpu_defaults core_params = {
.pid_policy = {
.sample_rate_ms = 10,
.deadband = 0,
.setpoint = 97,
.p_gain_pct = 20,
.d_gain_pct = 0,
.i_gain_pct = 0,
},
.funcs = {
.get_max = core_get_max_pstate,
.get_min = core_get_min_pstate,
.get_turbo = core_get_turbo_pstate,
.get_scaling = core_get_scaling,
.set = core_set_pstate,
},
};
static struct cpu_defaults byt_params = {
.pid_policy = {
.sample_rate_ms = 10,
.deadband = 0,
.setpoint = 97,
.p_gain_pct = 14,
.d_gain_pct = 0,
.i_gain_pct = 4,
},
.funcs = {
.get_max = byt_get_max_pstate,
.get_min = byt_get_min_pstate,
.get_turbo = byt_get_turbo_pstate,
.set = byt_set_pstate,
.get_scaling = byt_get_scaling,
.get_vid = byt_get_vid,
},
};
static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
{
int max_perf = cpu->pstate.turbo_pstate;
int max_perf_adj;
int min_perf;
if (limits.no_turbo || limits.turbo_disabled)
max_perf = cpu->pstate.max_pstate;
/*
* performance can be limited by user through sysfs, by cpufreq
* policy, or by cpu specific default values determined through
* experimentation.
*/
max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
*max = clamp_t(int, max_perf_adj,
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;
update_turbo_state();
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;
trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
cpu->pstate.current_pstate = pstate;
pstate_funcs.set(cpu, pstate);
}
static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
{
cpu->pstate.min_pstate = pstate_funcs.get_min();
cpu->pstate.max_pstate = pstate_funcs.get_max();
cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
cpu->pstate.scaling = pstate_funcs.get_scaling();
if (pstate_funcs.get_vid)
pstate_funcs.get_vid(cpu);
intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
}
static inline void intel_pstate_calc_busy(struct cpudata *cpu)
{
struct sample *sample = &cpu->sample;
int64_t core_pct;
core_pct = int_tofp(sample->aperf) * int_tofp(100);
core_pct = div64_u64(core_pct, int_tofp(sample->mperf));
sample->freq = fp_toint(
mul_fp(int_tofp(
cpu->pstate.max_pstate * cpu->pstate.scaling / 100),
core_pct));
sample->core_pct_busy = (int32_t)core_pct;
}
static inline void intel_pstate_sample(struct cpudata *cpu)
{
u64 aperf, mperf;
unsigned long flags;
local_irq_save(flags);
rdmsrl(MSR_IA32_APERF, aperf);
rdmsrl(MSR_IA32_MPERF, mperf);
local_irq_restore(flags);
cpu->last_sample_time = cpu->sample.time;
cpu->sample.time = ktime_get();
cpu->sample.aperf = aperf;
cpu->sample.mperf = mperf;
cpu->sample.aperf -= cpu->prev_aperf;
cpu->sample.mperf -= cpu->prev_mperf;
intel_pstate_calc_busy(cpu);
cpu->prev_aperf = aperf;
cpu->prev_mperf = mperf;
}
static inline void intel_hwp_set_sample_time(struct cpudata *cpu)
{
int delay;
delay = msecs_to_jiffies(50);
mod_timer_pinned(&cpu->timer, jiffies + delay);
}
static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
{
int delay;
delay = msecs_to_jiffies(pid_params.sample_rate_ms);
mod_timer_pinned(&cpu->timer, jiffies + delay);
}
static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
{
int32_t core_busy, max_pstate, current_pstate, sample_ratio;
u32 duration_us;
u32 sample_time;
/*
* core_busy is the ratio of actual performance to max
* max_pstate is the max non turbo pstate available
* current_pstate was the pstate that was requested during
* the last sample period.
*
* We normalize core_busy, which was our actual percent
* performance to what we requested during the last sample
* period. The result will be a percentage of busy at a
* specified pstate.
*/
core_busy = cpu->sample.core_pct_busy;
max_pstate = int_tofp(cpu->pstate.max_pstate);
current_pstate = int_tofp(cpu->pstate.current_pstate);
core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
/*
* Since we have a deferred timer, it will not fire unless
* we are in C0. So, determine if the actual elapsed time
* is significantly greater (3x) than our sample interval. If it
* is, then we were idle for a long enough period of time
* to adjust our busyness.
*/
sample_time = pid_params.sample_rate_ms * USEC_PER_MSEC;
duration_us = (u32) ktime_us_delta(cpu->sample.time,
cpu->last_sample_time);
if (duration_us > sample_time * 3) {
sample_ratio = div_fp(int_tofp(sample_time),
int_tofp(duration_us));
core_busy = mul_fp(core_busy, sample_ratio);
}
return core_busy;
}
static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
{
int32_t busy_scaled;
struct _pid *pid;
signed int ctl;
pid = &cpu->pid;
busy_scaled = intel_pstate_get_scaled_busy(cpu);
ctl = pid_calc(pid, busy_scaled);
/* Negative values of ctl increase the pstate and vice versa */
intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl);
}
static void intel_hwp_timer_func(unsigned long __data)
{
struct cpudata *cpu = (struct cpudata *) __data;
intel_pstate_sample(cpu);
intel_hwp_set_sample_time(cpu);
}
static void intel_pstate_timer_func(unsigned long __data)
{
struct cpudata *cpu = (struct cpudata *) __data;
struct sample *sample;
intel_pstate_sample(cpu);
sample = &cpu->sample;
intel_pstate_adjust_busy_pstate(cpu);
trace_pstate_sample(fp_toint(sample->core_pct_busy),
fp_toint(intel_pstate_get_scaled_busy(cpu)),
cpu->pstate.current_pstate,
sample->mperf,
sample->aperf,
sample->freq);
intel_pstate_set_sample_time(cpu);
}
#define ICPU(model, policy) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
(unsigned long)&policy }
static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
ICPU(0x2a, core_params),
ICPU(0x2d, core_params),
ICPU(0x37, byt_params),
ICPU(0x3a, core_params),
ICPU(0x3c, core_params),
ICPU(0x3d, core_params),
ICPU(0x3e, core_params),
ICPU(0x3f, core_params),
ICPU(0x45, core_params),
ICPU(0x46, core_params),
ICPU(0x47, core_params),
ICPU(0x4c, byt_params),
ICPU(0x4e, core_params),
ICPU(0x4f, core_params),
ICPU(0x56, core_params),
{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] = {
ICPU(0x56, core_params),
{}
};
static int intel_pstate_init_cpu(unsigned int cpunum)
{
struct cpudata *cpu;
if (!all_cpu_data[cpunum])
all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata),
GFP_KERNEL);
if (!all_cpu_data[cpunum])
return -ENOMEM;
cpu = all_cpu_data[cpunum];
cpu->cpu = cpunum;
intel_pstate_get_cpu_pstates(cpu);
init_timer_deferrable(&cpu->timer);
cpu->timer.data = (unsigned long)cpu;
cpu->timer.expires = jiffies + HZ/100;
if (!hwp_active)
cpu->timer.function = intel_pstate_timer_func;
else
cpu->timer.function = intel_hwp_timer_func;
intel_pstate_busy_pid_reset(cpu);
intel_pstate_sample(cpu);
add_timer_on(&cpu->timer, cpunum);
pr_debug("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->sample;
return sample->freq;
}
static int intel_pstate_set_policy(struct cpufreq_policy *policy)
{
if (!policy->cpuinfo.max_freq)
return -ENODEV;
if (policy->policy == CPUFREQ_POLICY_PERFORMANCE &&
policy->max >= policy->cpuinfo.max_freq) {
limits.min_policy_pct = 100;
limits.min_perf_pct = 100;
limits.min_perf = int_tofp(1);
cpufreq: intel_pstate: Fix setting max_perf_pct in performance policy Code which changes policy to powersave changes also max_policy_pct based on max_freq. Code which change max_perf_pct has upper limit base on value max_policy_pct. When policy is changing from powersave back to performance then max_policy_pct is not changed. Which means that changing max_perf_pct is not possible to high values if max_freq was too low in powersave policy. Test case: $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq 800000 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 3300000 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor performance $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 100 $ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor $ echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq $ echo 20 > /sys/devices/system/cpu/intel_pstate/max_perf_pct $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor powersave $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 800000 $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 20 $ echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor $ echo 3300000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq $ echo 100 > /sys/devices/system/cpu/intel_pstate/max_perf_pct $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor performance $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 3300000 $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 24 And now intel_pstate driver allows to set maximal value for max_perf_pct based on max_policy_pct which is 24 for previous powersave max_freq 800000. This patch will set default value for max_policy_pct when setting policy to performance so it will allow to set also max value for max_perf_pct. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Cc: All applicable <stable@vger.kernel.org> Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-10-16 07:16:51 +08:00
limits.max_policy_pct = 100;
limits.max_perf_pct = 100;
limits.max_perf = int_tofp(1);
limits.no_turbo = 0;
return 0;
}
limits.min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
limits.min_policy_pct = clamp_t(int, limits.min_policy_pct, 0 , 100);
limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
limits.max_policy_pct = (policy->max * 100) / policy->cpuinfo.max_freq;
limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100);
limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
if (hwp_active)
intel_pstate_hwp_set();
return 0;
}
static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
{
cpufreq_verify_within_cpu_limits(policy);
if (policy->policy != CPUFREQ_POLICY_POWERSAVE &&
policy->policy != CPUFREQ_POLICY_PERFORMANCE)
return -EINVAL;
return 0;
}
static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
{
int cpu_num = policy->cpu;
struct cpudata *cpu = all_cpu_data[cpu_num];
pr_info("intel_pstate CPU %d exiting\n", cpu_num);
del_timer_sync(&all_cpu_data[cpu_num]->timer);
if (hwp_active)
return;
intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
}
static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
int rc;
rc = intel_pstate_init_cpu(policy->cpu);
if (rc)
return rc;
cpu = all_cpu_data[policy->cpu];
if (limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
else
policy->policy = CPUFREQ_POLICY_POWERSAVE;
policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
/* cpuinfo and default policy values */
policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
policy->cpuinfo.max_freq =
cpu->pstate.turbo_pstate * cpu->pstate.scaling;
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,
.stop_cpu = intel_pstate_stop_cpu,
.name = "intel_pstate",
};
static int __initdata no_load;
static int __initdata no_hwp;
static int __initdata hwp_only;
static unsigned int force_load;
static int intel_pstate_msrs_not_valid(void)
{
/* Check that all the msr's we are using are valid. */
u64 aperf, mperf, tmp;
rdmsrl(MSR_IA32_APERF, aperf);
rdmsrl(MSR_IA32_MPERF, mperf);
if (!pstate_funcs.get_max() ||
!pstate_funcs.get_min() ||
!pstate_funcs.get_turbo())
return -ENODEV;
rdmsrl(MSR_IA32_APERF, tmp);
if (!(tmp - aperf))
return -ENODEV;
rdmsrl(MSR_IA32_MPERF, tmp);
if (!(tmp - mperf))
return -ENODEV;
return 0;
}
static void copy_pid_params(struct pstate_adjust_policy *policy)
{
pid_params.sample_rate_ms = policy->sample_rate_ms;
pid_params.p_gain_pct = policy->p_gain_pct;
pid_params.i_gain_pct = policy->i_gain_pct;
pid_params.d_gain_pct = policy->d_gain_pct;
pid_params.deadband = policy->deadband;
pid_params.setpoint = policy->setpoint;
}
static void copy_cpu_funcs(struct pstate_funcs *funcs)
{
pstate_funcs.get_max = funcs->get_max;
pstate_funcs.get_min = funcs->get_min;
pstate_funcs.get_turbo = funcs->get_turbo;
pstate_funcs.get_scaling = funcs->get_scaling;
pstate_funcs.set = funcs->set;
pstate_funcs.get_vid = funcs->get_vid;
}
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
#if IS_ENABLED(CONFIG_ACPI)
#include <acpi/processor.h>
static bool intel_pstate_no_acpi_pss(void)
{
int i;
for_each_possible_cpu(i) {
acpi_status status;
union acpi_object *pss;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_processor *pr = per_cpu(processors, i);
if (!pr)
continue;
status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
if (ACPI_FAILURE(status))
continue;
pss = buffer.pointer;
if (pss && pss->type == ACPI_TYPE_PACKAGE) {
kfree(pss);
return false;
}
kfree(pss);
}
return true;
}
static bool intel_pstate_has_acpi_ppc(void)
{
int i;
for_each_possible_cpu(i) {
struct acpi_processor *pr = per_cpu(processors, i);
if (!pr)
continue;
if (acpi_has_method(pr->handle, "_PPC"))
return true;
}
return false;
}
enum {
PSS,
PPC,
};
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
struct hw_vendor_info {
u16 valid;
char oem_id[ACPI_OEM_ID_SIZE];
char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
int oem_pwr_table;
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
};
/* Hardware vendor-specific info that has its own power management modes */
static struct hw_vendor_info vendor_info[] = {
{1, "HP ", "ProLiant", PSS},
{1, "ORACLE", "X4-2 ", PPC},
{1, "ORACLE", "X4-2L ", PPC},
{1, "ORACLE", "X4-2B ", PPC},
{1, "ORACLE", "X3-2 ", PPC},
{1, "ORACLE", "X3-2L ", PPC},
{1, "ORACLE", "X3-2B ", PPC},
{1, "ORACLE", "X4470M2 ", PPC},
{1, "ORACLE", "X4270M3 ", PPC},
{1, "ORACLE", "X4270M2 ", PPC},
{1, "ORACLE", "X4170M2 ", PPC},
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
{0, "", ""},
};
static bool intel_pstate_platform_pwr_mgmt_exists(void)
{
struct acpi_table_header hdr;
struct hw_vendor_info *v_info;
const struct x86_cpu_id *id;
u64 misc_pwr;
id = x86_match_cpu(intel_pstate_cpu_oob_ids);
if (id) {
rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
if ( misc_pwr & (1 << 8))
return true;
}
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
if (acpi_disabled ||
ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
return false;
for (v_info = vendor_info; v_info->valid; v_info++) {
if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
!strncmp(hdr.oem_table_id, v_info->oem_table_id,
ACPI_OEM_TABLE_ID_SIZE))
switch (v_info->oem_pwr_table) {
case PSS:
return intel_pstate_no_acpi_pss();
case PPC:
return intel_pstate_has_acpi_ppc() &&
(!force_load);
}
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
}
return false;
}
#else /* CONFIG_ACPI not enabled */
static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
#endif /* CONFIG_ACPI */
static int __init intel_pstate_init(void)
{
int cpu, rc = 0;
const struct x86_cpu_id *id;
struct cpu_defaults *cpu_info;
struct cpuinfo_x86 *c = &boot_cpu_data;
if (no_load)
return -ENODEV;
id = x86_match_cpu(intel_pstate_cpu_ids);
if (!id)
return -ENODEV;
intel_pstate: skip the driver if ACPI has power mgmt option Do not load the Intel pstate driver if the platform firmware (ACPI BIOS) supports the power management alternatives. The ACPI BIOS indicates that the OS control mode can be used if the _PSS (Performance Supported States) is defined in ACPI table. For the OS control mode, the Intel pstate driver will be loaded. HP BIOS has several power management modes (firmware, OS-control and so on). For the OS control mode in HP BIOS, the Intel p-state driver will be loaded. When the customer chooses the firmware power management in HP BIOS, the Intel p-state driver will be ignored. I put hw_vendor_info vendor_info in case other vendors (Dell, Lenovo...) have their firmware power management. Vendors should make sure their firmware power management works properly, and they can go for adding their vendor info to the variable. I have verified the patch on HP ProLiant servers. The patch worked correctly. Signed-off-by: Adrian Huang <adrianhuang0701@gmail.com> [rjw: Fixed up !CONFIG_ACPI build] [Linda Knippers: As Adrian has recently left HP, I retested the updated patch on an HP ProLiant server and verified that it is behaving correctly. When the BIOS is configured for OS control for power management, the intel_pstate driver loads as expected. When the BIOS is configured to provide the power management, the intel_pstate driver does not load and we get the pcc_cpufreq driver instead.] Signed-off-by: Linda Knippers <linda.knippers@hp.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-31 23:24:05 +08:00
/*
* The Intel pstate driver will be ignored if the platform
* firmware has its own power management modes.
*/
if (intel_pstate_platform_pwr_mgmt_exists())
return -ENODEV;
cpu_info = (struct cpu_defaults *)id->driver_data;
copy_pid_params(&cpu_info->pid_policy);
copy_cpu_funcs(&cpu_info->funcs);
if (intel_pstate_msrs_not_valid())
return -ENODEV;
pr_info("Intel P-state driver initializing.\n");
all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus());
if (!all_cpu_data)
return -ENOMEM;
if (cpu_has(c,X86_FEATURE_HWP) && !no_hwp)
intel_pstate_hwp_enable();
if (!hwp_active && hwp_only)
goto out;
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;
if (!strcmp(str, "no_hwp"))
no_hwp = 1;
if (!strcmp(str, "force"))
force_load = 1;
if (!strcmp(str, "hwp_only"))
hwp_only = 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");