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linux/drivers/cpufreq/intel_pstate.c
Rafael J. Wysocki 1e4f63aecb cpufreq: Avoid creating excessively large stack frames 
In the process of modifying a cpufreq policy, the cpufreq core makes
a copy of it including all of the internals which is stored on the
CPU stack.  Because struct cpufreq_policy is relatively large, this
may cause the size of the stack frame to exceed the 2 KB limit and
so the GCC complains when -Wframe-larger-than= is used.

In fact, it is not necessary to copy the entire policy structure
in order to modify it, however.

First, because cpufreq_set_policy() obtains the min and max policy
limits from frequency QoS now, it is not necessary to pass the limits
to it from the callers.  The only things that need to be passed to it
from there are the new governor pointer or (if there is a built-in
governor in the driver) the "policy" value representing the governor
choice.  They both can be passed as individual arguments, though, so
make cpufreq_set_policy() take them this way and rework its callers
accordingly.  This avoids making copies of cpufreq policies in the
callers of cpufreq_set_policy().

Second, cpufreq_set_policy() still needs to pass the new policy
data to the ->verify() callback of the cpufreq driver whose task
is to sanitize the min and max policy limits.  It still does not
need to make a full copy of struct cpufreq_policy for this purpose,
but it needs to pass a few items from it to the driver in case they
are needed (different drivers have different needs in that respect
and all of them have to be covered).  For this reason, introduce
struct cpufreq_policy_data to hold copies of the members of
struct cpufreq_policy used by the existing ->verify() driver
callbacks and pass a pointer to a temporary structure of that
type to ->verify() (instead of passing a pointer to full struct
cpufreq_policy to it).

While at it, notice that intel_pstate and longrun don't really need
to verify the "policy" value in struct cpufreq_policy, so drop those
check from them to avoid copying "policy" into struct
cpufreq_policy_data (which allows it to be slightly smaller).

Also while at it fix up white space in a couple of places and make
cpufreq_set_policy() static (as it can be so).

Fixes: 3000ce3c52 ("cpufreq: Use per-policy frequency QoS")
Link: https://lore.kernel.org/linux-pm/CAMuHMdX6-jb1W8uC2_237m8ctCpsnGp=JCxqt8pCWVqNXHmkVg@mail.gmail.com
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
2020-01-27 10:33:33 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* intel_pstate.c: Native P state management for Intel processors
*
* (C) Copyright 2012 Intel Corporation
* Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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/cpufreq.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/acpi.h>
#include <linux/vmalloc.h>
#include <linux/pm_qos.h>
#include <trace/events/power.h>
#include <asm/div64.h>
#include <asm/msr.h>
#include <asm/cpu_device_id.h>
#include <asm/cpufeature.h>
#include <asm/intel-family.h>
#define INTEL_PSTATE_SAMPLING_INTERVAL (10 * NSEC_PER_MSEC)
#define INTEL_CPUFREQ_TRANSITION_LATENCY 20000
#define INTEL_CPUFREQ_TRANSITION_DELAY 500
#ifdef CONFIG_ACPI
#include <acpi/processor.h>
#include <acpi/cppc_acpi.h>
#endif
#define FRAC_BITS 8
#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
#define fp_toint(X) ((X) >> FRAC_BITS)
#define ONE_EIGHTH_FP ((int64_t)1 << (FRAC_BITS - 3))
#define EXT_BITS 6
#define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS)
#define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS)
#define int_ext_tofp(X) ((int64_t)(X) << EXT_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(s64 x, s64 y)
{
return div64_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;
}
static inline int32_t percent_fp(int percent)
{
return div_fp(percent, 100);
}
static inline u64 mul_ext_fp(u64 x, u64 y)
{
return (x * y) >> EXT_FRAC_BITS;
}
static inline u64 div_ext_fp(u64 x, u64 y)
{
return div64_u64(x << EXT_FRAC_BITS, y);
}
static inline int32_t percent_ext_fp(int percent)
{
return div_ext_fp(percent, 100);
}
/**
* struct sample - Store performance sample
* @core_avg_perf: Ratio of APERF/MPERF which is the actual average
* performance during last sample period
* @busy_scaled: Scaled busy value which is used to calculate next
* P state. This can be different than core_avg_perf
* to account for cpu idle period
* @aperf: Difference of actual performance frequency clock count
* read from APERF MSR between last and current sample
* @mperf: Difference of maximum performance frequency clock count
* read from MPERF MSR between last and current sample
* @tsc: Difference of time stamp counter between last and
* current sample
* @time: Current time from scheduler
*
* This structure is used in the cpudata structure to store performance sample
* data for choosing next P State.
*/
struct sample {
int32_t core_avg_perf;
int32_t busy_scaled;
u64 aperf;
u64 mperf;
u64 tsc;
u64 time;
};
/**
* struct pstate_data - Store P state data
* @current_pstate: Current requested P state
* @min_pstate: Min P state possible for this platform
* @max_pstate: Max P state possible for this platform
* @max_pstate_physical:This is physical Max P state for a processor
* This can be higher than the max_pstate which can
* be limited by platform thermal design power limits
* @scaling: Scaling factor to convert frequency to cpufreq
* frequency units
* @turbo_pstate: Max Turbo P state possible for this platform
* @max_freq: @max_pstate frequency in cpufreq units
* @turbo_freq: @turbo_pstate frequency in cpufreq units
*
* Stores the per cpu model P state limits and current P state.
*/
struct pstate_data {
int current_pstate;
int min_pstate;
int max_pstate;
int max_pstate_physical;
int scaling;
int turbo_pstate;
unsigned int max_freq;
unsigned int turbo_freq;
};
/**
* struct vid_data - Stores voltage information data
* @min: VID data for this platform corresponding to
* the lowest P state
* @max: VID data corresponding to the highest P State.
* @turbo: VID data for turbo P state
* @ratio: Ratio of (vid max - vid min) /
* (max P state - Min P State)
*
* Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling)
* This data is used in Atom platforms, where in addition to target P state,
* the voltage data needs to be specified to select next P State.
*/
struct vid_data {
int min;
int max;
int turbo;
int32_t ratio;
};
/**
* struct global_params - Global parameters, mostly tunable via sysfs.
* @no_turbo: Whether or not to use turbo P-states.
* @turbo_disabled: Whether or not turbo P-states are available at all,
* based on the MSR_IA32_MISC_ENABLE value and whether or
* not the maximum reported turbo P-state is different from
* the maximum reported non-turbo one.
* @turbo_disabled_mf: The @turbo_disabled value reflected by cpuinfo.max_freq.
* @min_perf_pct: Minimum capacity limit in percent of the maximum turbo
* P-state capacity.
* @max_perf_pct: Maximum capacity limit in percent of the maximum turbo
* P-state capacity.
*/
struct global_params {
bool no_turbo;
bool turbo_disabled;
bool turbo_disabled_mf;
int max_perf_pct;
int min_perf_pct;
};
/**
* struct cpudata - Per CPU instance data storage
* @cpu: CPU number for this instance data
* @policy: CPUFreq policy value
* @update_util: CPUFreq utility callback information
* @update_util_set: CPUFreq utility callback is set
* @iowait_boost: iowait-related boost fraction
* @last_update: Time of the last update.
* @pstate: Stores P state limits for this CPU
* @vid: Stores VID limits for this CPU
* @last_sample_time: Last Sample time
* @aperf_mperf_shift: Number of clock cycles after aperf, merf is incremented
* This shift is a multiplier to mperf delta to
* calculate CPU busy.
* @prev_aperf: Last APERF value read from APERF MSR
* @prev_mperf: Last MPERF value read from MPERF MSR
* @prev_tsc: Last timestamp counter (TSC) value
* @prev_cummulative_iowait: IO Wait time difference from last and
* current sample
* @sample: Storage for storing last Sample data
* @min_perf_ratio: Minimum capacity in terms of PERF or HWP ratios
* @max_perf_ratio: Maximum capacity in terms of PERF or HWP ratios
* @acpi_perf_data: Stores ACPI perf information read from _PSS
* @valid_pss_table: Set to true for valid ACPI _PSS entries found
* @epp_powersave: Last saved HWP energy performance preference
* (EPP) or energy performance bias (EPB),
* when policy switched to performance
* @epp_policy: Last saved policy used to set EPP/EPB
* @epp_default: Power on default HWP energy performance
* preference/bias
* @epp_saved: Saved EPP/EPB during system suspend or CPU offline
* operation
* @hwp_req_cached: Cached value of the last HWP Request MSR
* @hwp_cap_cached: Cached value of the last HWP Capabilities MSR
* @last_io_update: Last time when IO wake flag was set
* @sched_flags: Store scheduler flags for possible cross CPU update
* @hwp_boost_min: Last HWP boosted min performance
*
* This structure stores per CPU instance data for all CPUs.
*/
struct cpudata {
int cpu;
unsigned int policy;
struct update_util_data update_util;
bool update_util_set;
struct pstate_data pstate;
struct vid_data vid;
u64 last_update;
u64 last_sample_time;
u64 aperf_mperf_shift;
u64 prev_aperf;
u64 prev_mperf;
u64 prev_tsc;
u64 prev_cummulative_iowait;
struct sample sample;
int32_t min_perf_ratio;
int32_t max_perf_ratio;
#ifdef CONFIG_ACPI
struct acpi_processor_performance acpi_perf_data;
bool valid_pss_table;
#endif
unsigned int iowait_boost;
s16 epp_powersave;
s16 epp_policy;
s16 epp_default;
s16 epp_saved;
u64 hwp_req_cached;
u64 hwp_cap_cached;
u64 last_io_update;
unsigned int sched_flags;
u32 hwp_boost_min;
};
static struct cpudata **all_cpu_data;
/**
* struct pstate_funcs - Per CPU model specific callbacks
* @get_max: Callback to get maximum non turbo effective P state
* @get_max_physical: Callback to get maximum non turbo physical P state
* @get_min: Callback to get minimum P state
* @get_turbo: Callback to get turbo P state
* @get_scaling: Callback to get frequency scaling factor
* @get_val: Callback to convert P state to actual MSR write value
* @get_vid: Callback to get VID data for Atom platforms
*
* Core and Atom CPU models have different way to get P State limits. This
* structure is used to store those callbacks.
*/
struct pstate_funcs {
int (*get_max)(void);
int (*get_max_physical)(void);
int (*get_min)(void);
int (*get_turbo)(void);
int (*get_scaling)(void);
int (*get_aperf_mperf_shift)(void);
u64 (*get_val)(struct cpudata*, int pstate);
void (*get_vid)(struct cpudata *);
};
static struct pstate_funcs pstate_funcs __read_mostly;
static int hwp_active __read_mostly;
static int hwp_mode_bdw __read_mostly;
static bool per_cpu_limits __read_mostly;
static bool hwp_boost __read_mostly;
static struct cpufreq_driver *intel_pstate_driver __read_mostly;
#ifdef CONFIG_ACPI
static bool acpi_ppc;
#endif
static struct global_params global;
static DEFINE_MUTEX(intel_pstate_driver_lock);
static DEFINE_MUTEX(intel_pstate_limits_lock);
#ifdef CONFIG_ACPI
static bool intel_pstate_acpi_pm_profile_server(void)
{
if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER ||
acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER)
return true;
return false;
}
static bool intel_pstate_get_ppc_enable_status(void)
{
if (intel_pstate_acpi_pm_profile_server())
return true;
return acpi_ppc;
}
#ifdef CONFIG_ACPI_CPPC_LIB
/* The work item is needed to avoid CPU hotplug locking issues */
static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
{
sched_set_itmt_support();
}
static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
static void intel_pstate_set_itmt_prio(int cpu)
{
struct cppc_perf_caps cppc_perf;
static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
int ret;
ret = cppc_get_perf_caps(cpu, &cppc_perf);
if (ret)
return;
/*
* The priorities can be set regardless of whether or not
* sched_set_itmt_support(true) has been called and it is valid to
* update them at any time after it has been called.
*/
sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
if (max_highest_perf <= min_highest_perf) {
if (cppc_perf.highest_perf > max_highest_perf)
max_highest_perf = cppc_perf.highest_perf;
if (cppc_perf.highest_perf < min_highest_perf)
min_highest_perf = cppc_perf.highest_perf;
if (max_highest_perf > min_highest_perf) {
/*
* This code can be run during CPU online under the
* CPU hotplug locks, so sched_set_itmt_support()
* cannot be called from here. Queue up a work item
* to invoke it.
*/
schedule_work(&sched_itmt_work);
}
}
}
static int intel_pstate_get_cppc_guranteed(int cpu)
{
struct cppc_perf_caps cppc_perf;
int ret;
ret = cppc_get_perf_caps(cpu, &cppc_perf);
if (ret)
return ret;
if (cppc_perf.guaranteed_perf)
return cppc_perf.guaranteed_perf;
return cppc_perf.nominal_perf;
}
#else /* CONFIG_ACPI_CPPC_LIB */
static void intel_pstate_set_itmt_prio(int cpu)
{
}
#endif /* CONFIG_ACPI_CPPC_LIB */
static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
int ret;
int i;
if (hwp_active) {
intel_pstate_set_itmt_prio(policy->cpu);
return;
}
if (!intel_pstate_get_ppc_enable_status())
return;
cpu = all_cpu_data[policy->cpu];
ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
policy->cpu);
if (ret)
return;
/*
* Check if the control value in _PSS is for PERF_CTL MSR, which should
* guarantee that the states returned by it map to the states in our
* list directly.
*/
if (cpu->acpi_perf_data.control_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE)
goto err;
/*
* If there is only one entry _PSS, simply ignore _PSS and continue as
* usual without taking _PSS into account
*/
if (cpu->acpi_perf_data.state_count < 2)
goto err;
pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu);
for (i = 0; i < cpu->acpi_perf_data.state_count; i++) {
pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n",
(i == cpu->acpi_perf_data.state ? '*' : ' '), i,
(u32) cpu->acpi_perf_data.states[i].core_frequency,
(u32) cpu->acpi_perf_data.states[i].power,
(u32) cpu->acpi_perf_data.states[i].control);
}
/*
* The _PSS table doesn't contain whole turbo frequency range.
* This just contains +1 MHZ above the max non turbo frequency,
* with control value corresponding to max turbo ratio. But
* when cpufreq set policy is called, it will call with this
* max frequency, which will cause a reduced performance as
* this driver uses real max turbo frequency as the max
* frequency. So correct this frequency in _PSS table to
* correct max turbo frequency based on the turbo state.
* Also need to convert to MHz as _PSS freq is in MHz.
*/
if (!global.turbo_disabled)
cpu->acpi_perf_data.states[0].core_frequency =
policy->cpuinfo.max_freq / 1000;
cpu->valid_pss_table = true;
pr_debug("_PPC limits will be enforced\n");
return;
err:
cpu->valid_pss_table = false;
acpi_processor_unregister_performance(policy->cpu);
}
static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
cpu = all_cpu_data[policy->cpu];
if (!cpu->valid_pss_table)
return;
acpi_processor_unregister_performance(policy->cpu);
}
#else /* CONFIG_ACPI */
static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
{
}
static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
{
}
static inline bool intel_pstate_acpi_pm_profile_server(void)
{
return false;
}
#endif /* CONFIG_ACPI */
#ifndef CONFIG_ACPI_CPPC_LIB
static int intel_pstate_get_cppc_guranteed(int cpu)
{
return -ENOTSUPP;
}
#endif /* CONFIG_ACPI_CPPC_LIB */
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);
global.turbo_disabled =
(misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
}
static int min_perf_pct_min(void)
{
struct cpudata *cpu = all_cpu_data[0];
int turbo_pstate = cpu->pstate.turbo_pstate;
return turbo_pstate ?
(cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
}
static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
{
u64 epb;
int ret;
if (!boot_cpu_has(X86_FEATURE_EPB))
return -ENXIO;
ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
if (ret)
return (s16)ret;
return (s16)(epb & 0x0f);
}
static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
{
s16 epp;
if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
/*
* When hwp_req_data is 0, means that caller didn't read
* MSR_HWP_REQUEST, so need to read and get EPP.
*/
if (!hwp_req_data) {
epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST,
&hwp_req_data);
if (epp)
return epp;
}
epp = (hwp_req_data >> 24) & 0xff;
} else {
/* When there is no EPP present, HWP uses EPB settings */
epp = intel_pstate_get_epb(cpu_data);
}
return epp;
}
static int intel_pstate_set_epb(int cpu, s16 pref)
{
u64 epb;
int ret;
if (!boot_cpu_has(X86_FEATURE_EPB))
return -ENXIO;
ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
if (ret)
return ret;
epb = (epb & ~0x0f) | pref;
wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb);
return 0;
}
/*
* EPP/EPB display strings corresponding to EPP index in the
* energy_perf_strings[]
* index String
*-------------------------------------
* 0 default
* 1 performance
* 2 balance_performance
* 3 balance_power
* 4 power
*/
static const char * const energy_perf_strings[] = {
"default",
"performance",
"balance_performance",
"balance_power",
"power",
NULL
};
static const unsigned int epp_values[] = {
HWP_EPP_PERFORMANCE,
HWP_EPP_BALANCE_PERFORMANCE,
HWP_EPP_BALANCE_POWERSAVE,
HWP_EPP_POWERSAVE
};
static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
{
s16 epp;
int index = -EINVAL;
epp = intel_pstate_get_epp(cpu_data, 0);
if (epp < 0)
return epp;
if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
if (epp == HWP_EPP_PERFORMANCE)
return 1;
if (epp <= HWP_EPP_BALANCE_PERFORMANCE)
return 2;
if (epp <= HWP_EPP_BALANCE_POWERSAVE)
return 3;
else
return 4;
} else if (boot_cpu_has(X86_FEATURE_EPB)) {
/*
* Range:
* 0x00-0x03 : Performance
* 0x04-0x07 : Balance performance
* 0x08-0x0B : Balance power
* 0x0C-0x0F : Power
* The EPB is a 4 bit value, but our ranges restrict the
* value which can be set. Here only using top two bits
* effectively.
*/
index = (epp >> 2) + 1;
}
return index;
}
static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
int pref_index)
{
int epp = -EINVAL;
int ret;
if (!pref_index)
epp = cpu_data->epp_default;
mutex_lock(&intel_pstate_limits_lock);
if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
u64 value;
ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value);
if (ret)
goto return_pref;
value &= ~GENMASK_ULL(31, 24);
if (epp == -EINVAL)
epp = epp_values[pref_index - 1];
value |= (u64)epp << 24;
ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value);
} else {
if (epp == -EINVAL)
epp = (pref_index - 1) << 2;
ret = intel_pstate_set_epb(cpu_data->cpu, epp);
}
return_pref:
mutex_unlock(&intel_pstate_limits_lock);
return ret;
}
static ssize_t show_energy_performance_available_preferences(
struct cpufreq_policy *policy, char *buf)
{
int i = 0;
int ret = 0;
while (energy_perf_strings[i] != NULL)
ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
ret += sprintf(&buf[ret], "\n");
return ret;
}
cpufreq_freq_attr_ro(energy_performance_available_preferences);
static ssize_t store_energy_performance_preference(
struct cpufreq_policy *policy, const char *buf, size_t count)
{
struct cpudata *cpu_data = all_cpu_data[policy->cpu];
char str_preference[21];
int ret;
ret = sscanf(buf, "%20s", str_preference);
if (ret != 1)
return -EINVAL;
ret = match_string(energy_perf_strings, -1, str_preference);
if (ret < 0)
return ret;
intel_pstate_set_energy_pref_index(cpu_data, ret);
return count;
}
static ssize_t show_energy_performance_preference(
struct cpufreq_policy *policy, char *buf)
{
struct cpudata *cpu_data = all_cpu_data[policy->cpu];
int preference;
preference = intel_pstate_get_energy_pref_index(cpu_data);
if (preference < 0)
return preference;
return sprintf(buf, "%s\n", energy_perf_strings[preference]);
}
cpufreq_freq_attr_rw(energy_performance_preference);
static ssize_t show_base_frequency(struct cpufreq_policy *policy, char *buf)
{
struct cpudata *cpu;
u64 cap;
int ratio;
ratio = intel_pstate_get_cppc_guranteed(policy->cpu);
if (ratio <= 0) {
rdmsrl_on_cpu(policy->cpu, MSR_HWP_CAPABILITIES, &cap);
ratio = HWP_GUARANTEED_PERF(cap);
}
cpu = all_cpu_data[policy->cpu];
return sprintf(buf, "%d\n", ratio * cpu->pstate.scaling);
}
cpufreq_freq_attr_ro(base_frequency);
static struct freq_attr *hwp_cpufreq_attrs[] = {
&energy_performance_preference,
&energy_performance_available_preferences,
&base_frequency,
NULL,
};
static void intel_pstate_get_hwp_max(unsigned int cpu, int *phy_max,
int *current_max)
{
u64 cap;
rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
WRITE_ONCE(all_cpu_data[cpu]->hwp_cap_cached, cap);
if (global.no_turbo)
*current_max = HWP_GUARANTEED_PERF(cap);
else
*current_max = HWP_HIGHEST_PERF(cap);
*phy_max = HWP_HIGHEST_PERF(cap);
}
static void intel_pstate_hwp_set(unsigned int cpu)
{
struct cpudata *cpu_data = all_cpu_data[cpu];
int max, min;
u64 value;
s16 epp;
max = cpu_data->max_perf_ratio;
min = cpu_data->min_perf_ratio;
if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE)
min = max;
rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
value &= ~HWP_MIN_PERF(~0L);
value |= HWP_MIN_PERF(min);
value &= ~HWP_MAX_PERF(~0L);
value |= HWP_MAX_PERF(max);
if (cpu_data->epp_policy == cpu_data->policy)
goto skip_epp;
cpu_data->epp_policy = cpu_data->policy;
if (cpu_data->epp_saved >= 0) {
epp = cpu_data->epp_saved;
cpu_data->epp_saved = -EINVAL;
goto update_epp;
}
if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) {
epp = intel_pstate_get_epp(cpu_data, value);
cpu_data->epp_powersave = epp;
/* If EPP read was failed, then don't try to write */
if (epp < 0)
goto skip_epp;
epp = 0;
} else {
/* skip setting EPP, when saved value is invalid */
if (cpu_data->epp_powersave < 0)
goto skip_epp;
/*
* No need to restore EPP when it is not zero. This
* means:
* - Policy is not changed
* - user has manually changed
* - Error reading EPB
*/
epp = intel_pstate_get_epp(cpu_data, value);
if (epp)
goto skip_epp;
epp = cpu_data->epp_powersave;
}
update_epp:
if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
value &= ~GENMASK_ULL(31, 24);
value |= (u64)epp << 24;
} else {
intel_pstate_set_epb(cpu, epp);
}
skip_epp:
WRITE_ONCE(cpu_data->hwp_req_cached, value);
wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
}
static void intel_pstate_hwp_force_min_perf(int cpu)
{
u64 value;
int min_perf;
value = all_cpu_data[cpu]->hwp_req_cached;
value &= ~GENMASK_ULL(31, 0);
min_perf = HWP_LOWEST_PERF(all_cpu_data[cpu]->hwp_cap_cached);
/* Set hwp_max = hwp_min */
value |= HWP_MAX_PERF(min_perf);
value |= HWP_MIN_PERF(min_perf);
/* Set EPP to min */
if (boot_cpu_has(X86_FEATURE_HWP_EPP))
value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
}
static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
{
struct cpudata *cpu_data = all_cpu_data[policy->cpu];
if (!hwp_active)
return 0;
cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0);
return 0;
}
static void intel_pstate_hwp_enable(struct cpudata *cpudata);
static int intel_pstate_resume(struct cpufreq_policy *policy)
{
if (!hwp_active)
return 0;
mutex_lock(&intel_pstate_limits_lock);
if (policy->cpu == 0)
intel_pstate_hwp_enable(all_cpu_data[policy->cpu]);
all_cpu_data[policy->cpu]->epp_policy = 0;
intel_pstate_hwp_set(policy->cpu);
mutex_unlock(&intel_pstate_limits_lock);
return 0;
}
static void intel_pstate_update_policies(void)
{
int cpu;
for_each_possible_cpu(cpu)
cpufreq_update_policy(cpu);
}
static void intel_pstate_update_max_freq(unsigned int cpu)
{
struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
struct cpudata *cpudata;
if (!policy)
return;
cpudata = all_cpu_data[cpu];
policy->cpuinfo.max_freq = global.turbo_disabled_mf ?
cpudata->pstate.max_freq : cpudata->pstate.turbo_freq;
refresh_frequency_limits(policy);
cpufreq_cpu_release(policy);
}
static void intel_pstate_update_limits(unsigned int cpu)
{
mutex_lock(&intel_pstate_driver_lock);
update_turbo_state();
/*
* If turbo has been turned on or off globally, policy limits for
* all CPUs need to be updated to reflect that.
*/
if (global.turbo_disabled_mf != global.turbo_disabled) {
global.turbo_disabled_mf = global.turbo_disabled;
for_each_possible_cpu(cpu)
intel_pstate_update_max_freq(cpu);
} else {
cpufreq_update_policy(cpu);
}
mutex_unlock(&intel_pstate_driver_lock);
}
/************************** sysfs begin ************************/
#define show_one(file_name, object) \
static ssize_t show_##file_name \
(struct kobject *kobj, struct kobj_attribute *attr, char *buf) \
{ \
return sprintf(buf, "%u\n", global.object); \
}
static ssize_t intel_pstate_show_status(char *buf);
static int intel_pstate_update_status(const char *buf, size_t size);
static ssize_t show_status(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
ssize_t ret;
mutex_lock(&intel_pstate_driver_lock);
ret = intel_pstate_show_status(buf);
mutex_unlock(&intel_pstate_driver_lock);
return ret;
}
static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
const char *buf, size_t count)
{
char *p = memchr(buf, '\n', count);
int ret;
mutex_lock(&intel_pstate_driver_lock);
ret = intel_pstate_update_status(buf, p ? p - buf : count);
mutex_unlock(&intel_pstate_driver_lock);
return ret < 0 ? ret : count;
}
static ssize_t show_turbo_pct(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct cpudata *cpu;
int total, no_turbo, turbo_pct;
uint32_t turbo_fp;
mutex_lock(&intel_pstate_driver_lock);
if (!intel_pstate_driver) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
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(no_turbo, total);
turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
mutex_unlock(&intel_pstate_driver_lock);
return sprintf(buf, "%u\n", turbo_pct);
}
static ssize_t show_num_pstates(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct cpudata *cpu;
int total;
mutex_lock(&intel_pstate_driver_lock);
if (!intel_pstate_driver) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
mutex_unlock(&intel_pstate_driver_lock);
return sprintf(buf, "%u\n", total);
}
static ssize_t show_no_turbo(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
ssize_t ret;
mutex_lock(&intel_pstate_driver_lock);
if (!intel_pstate_driver) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
update_turbo_state();
if (global.turbo_disabled)
ret = sprintf(buf, "%u\n", global.turbo_disabled);
else
ret = sprintf(buf, "%u\n", global.no_turbo);
mutex_unlock(&intel_pstate_driver_lock);
return ret;
}
static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
const char *buf, size_t count)
{
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
mutex_lock(&intel_pstate_driver_lock);
if (!intel_pstate_driver) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
mutex_lock(&intel_pstate_limits_lock);
update_turbo_state();
if (global.turbo_disabled) {
pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
mutex_unlock(&intel_pstate_limits_lock);
mutex_unlock(&intel_pstate_driver_lock);
return -EPERM;
}
global.no_turbo = clamp_t(int, input, 0, 1);
if (global.no_turbo) {
struct cpudata *cpu = all_cpu_data[0];
int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate;
/* Squash the global minimum into the permitted range. */
if (global.min_perf_pct > pct)
global.min_perf_pct = pct;
}
mutex_unlock(&intel_pstate_limits_lock);
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
static struct cpufreq_driver intel_pstate;
static void update_qos_request(enum freq_qos_req_type type)
{
int max_state, turbo_max, freq, i, perf_pct;
struct freq_qos_request *req;
struct cpufreq_policy *policy;
for_each_possible_cpu(i) {
struct cpudata *cpu = all_cpu_data[i];
policy = cpufreq_cpu_get(i);
if (!policy)
continue;
req = policy->driver_data;
cpufreq_cpu_put(policy);
if (!req)
continue;
if (hwp_active)
intel_pstate_get_hwp_max(i, &turbo_max, &max_state);
else
turbo_max = cpu->pstate.turbo_pstate;
if (type == FREQ_QOS_MIN) {
perf_pct = global.min_perf_pct;
} else {
req++;
perf_pct = global.max_perf_pct;
}
freq = DIV_ROUND_UP(turbo_max * perf_pct, 100);
freq *= cpu->pstate.scaling;
if (freq_qos_update_request(req, freq) < 0)
pr_warn("Failed to update freq constraint: CPU%d\n", i);
}
}
static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
const char *buf, size_t count)
{
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
mutex_lock(&intel_pstate_driver_lock);
if (!intel_pstate_driver) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
mutex_lock(&intel_pstate_limits_lock);
global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100);
mutex_unlock(&intel_pstate_limits_lock);
if (intel_pstate_driver == &intel_pstate)
intel_pstate_update_policies();
else
update_qos_request(FREQ_QOS_MAX);
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
static ssize_t store_min_perf_pct(struct kobject *a, struct kobj_attribute *b,
const char *buf, size_t count)
{
unsigned int input;
int ret;
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
mutex_lock(&intel_pstate_driver_lock);
if (!intel_pstate_driver) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
mutex_lock(&intel_pstate_limits_lock);
global.min_perf_pct = clamp_t(int, input,
min_perf_pct_min(), global.max_perf_pct);
mutex_unlock(&intel_pstate_limits_lock);
if (intel_pstate_driver == &intel_pstate)
intel_pstate_update_policies();
else
update_qos_request(FREQ_QOS_MIN);
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
static ssize_t show_hwp_dynamic_boost(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%u\n", hwp_boost);
}
static ssize_t store_hwp_dynamic_boost(struct kobject *a,
struct kobj_attribute *b,
const char *buf, size_t count)
{
unsigned int input;
int ret;
ret = kstrtouint(buf, 10, &input);
if (ret)
return ret;
mutex_lock(&intel_pstate_driver_lock);
hwp_boost = !!input;
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
show_one(max_perf_pct, max_perf_pct);
show_one(min_perf_pct, min_perf_pct);
define_one_global_rw(status);
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);
define_one_global_rw(hwp_dynamic_boost);
static struct attribute *intel_pstate_attributes[] = {
&status.attr,
&no_turbo.attr,
&turbo_pct.attr,
&num_pstates.attr,
NULL
};
static const 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);
if (WARN_ON(!intel_pstate_kobject))
return;
rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
if (WARN_ON(rc))
return;
/*
* If per cpu limits are enforced there are no global limits, so
* return without creating max/min_perf_pct attributes
*/
if (per_cpu_limits)
return;
rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr);
WARN_ON(rc);
rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr);
WARN_ON(rc);
if (hwp_active) {
rc = sysfs_create_file(intel_pstate_kobject,
&hwp_dynamic_boost.attr);
WARN_ON(rc);
}
}
/************************** sysfs end ************************/
static void intel_pstate_hwp_enable(struct cpudata *cpudata)
{
/* First disable HWP notification interrupt as we don't process them */
if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
cpudata->epp_policy = 0;
if (cpudata->epp_default == -EINVAL)
cpudata->epp_default = intel_pstate_get_epp(cpudata, 0);
}
#define MSR_IA32_POWER_CTL_BIT_EE 19
/* Disable energy efficiency optimization */
static void intel_pstate_disable_ee(int cpu)
{
u64 power_ctl;
int ret;
ret = rdmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, &power_ctl);
if (ret)
return;
if (!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE))) {
pr_info("Disabling energy efficiency optimization\n");
power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE);
wrmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, power_ctl);
}
}
static int atom_get_min_pstate(void)
{
u64 value;
rdmsrl(MSR_ATOM_CORE_RATIOS, value);
return (value >> 8) & 0x7F;
}
static int atom_get_max_pstate(void)
{
u64 value;
rdmsrl(MSR_ATOM_CORE_RATIOS, value);
return (value >> 16) & 0x7F;
}
static int atom_get_turbo_pstate(void)
{
u64 value;
rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value);
return value & 0x7F;
}
static u64 atom_get_val(struct cpudata *cpudata, int pstate)
{
u64 val;
int32_t vid_fp;
u32 vid;
val = (u64)pstate << 8;
if (global.no_turbo && !global.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;
return val | vid;
}
static int silvermont_get_scaling(void)
{
u64 value;
int i;
/* Defined in Table 35-6 from SDM (Sept 2015) */
static int silvermont_freq_table[] = {
83300, 100000, 133300, 116700, 80000};
rdmsrl(MSR_FSB_FREQ, value);
i = value & 0x7;
WARN_ON(i > 4);
return silvermont_freq_table[i];
}
static int airmont_get_scaling(void)
{
u64 value;
int i;
/* Defined in Table 35-10 from SDM (Sept 2015) */
static int airmont_freq_table[] = {
83300, 100000, 133300, 116700, 80000,
93300, 90000, 88900, 87500};
rdmsrl(MSR_FSB_FREQ, value);
i = value & 0xF;
WARN_ON(i > 8);
return airmont_freq_table[i];
}
static void atom_get_vid(struct cpudata *cpudata)
{
u64 value;
rdmsrl(MSR_ATOM_CORE_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(MSR_ATOM_CORE_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_physical(void)
{
u64 value;
rdmsrl(MSR_PLATFORM_INFO, value);
return (value >> 8) & 0xFF;
}
static int core_get_tdp_ratio(u64 plat_info)
{
/* Check how many TDP levels present */
if (plat_info & 0x600000000) {
u64 tdp_ctrl;
u64 tdp_ratio;
int tdp_msr;
int err;
/* Get the TDP level (0, 1, 2) to get ratios */
err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
if (err)
return err;
/* TDP MSR are continuous starting at 0x648 */
tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
err = rdmsrl_safe(tdp_msr, &tdp_ratio);
if (err)
return err;
/* For level 1 and 2, bits[23:16] contain the ratio */
if (tdp_ctrl & 0x03)
tdp_ratio >>= 16;
tdp_ratio &= 0xff; /* ratios are only 8 bits long */
pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
return (int)tdp_ratio;
}
return -ENXIO;
}
static int core_get_max_pstate(void)
{
u64 tar;
u64 plat_info;
int max_pstate;
int tdp_ratio;
int err;
rdmsrl(MSR_PLATFORM_INFO, plat_info);
max_pstate = (plat_info >> 8) & 0xFF;
tdp_ratio = core_get_tdp_ratio(plat_info);
if (tdp_ratio <= 0)
return max_pstate;
if (hwp_active) {
/* Turbo activation ratio is not used on HWP platforms */
return tdp_ratio;
}
err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
if (!err) {
int tar_levels;
/* Do some sanity checking for safety */
tar_levels = tar & 0xff;
if (tdp_ratio - 1 == tar_levels) {
max_pstate = tar_levels;
pr_debug("max_pstate=TAC %x\n", max_pstate);
}
}
return max_pstate;
}
static int core_get_turbo_pstate(void)
{
u64 value;
int nont, ret;
rdmsrl(MSR_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 u64 core_get_val(struct cpudata *cpudata, int pstate)
{
u64 val;
val = (u64)pstate << 8;
if (global.no_turbo && !global.turbo_disabled)
val |= (u64)1 << 32;
return val;
}
static int knl_get_aperf_mperf_shift(void)
{
return 10;
}
static int knl_get_turbo_pstate(void)
{
u64 value;
int nont, ret;
rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
nont = core_get_max_pstate();
ret = (((value) >> 8) & 0xFF);
if (ret <= nont)
ret = nont;
return ret;
}
static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
{
trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
cpu->pstate.current_pstate = pstate;
/*
* Generally, there is no guarantee that this code will always run on
* the CPU being updated, so force the register update to run on the
* right CPU.
*/
wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL,
pstate_funcs.get_val(cpu, pstate));
}
static void intel_pstate_set_min_pstate(struct cpudata *cpu)
{
intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
}
static void intel_pstate_max_within_limits(struct cpudata *cpu)
{
int pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio);
update_turbo_state();
intel_pstate_set_pstate(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.max_pstate_physical = pstate_funcs.get_max_physical();
cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
cpu->pstate.scaling = pstate_funcs.get_scaling();
cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
if (hwp_active && !hwp_mode_bdw) {
unsigned int phy_max, current_max;
intel_pstate_get_hwp_max(cpu->cpu, &phy_max, &current_max);
cpu->pstate.turbo_freq = phy_max * cpu->pstate.scaling;
} else {
cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
}
if (pstate_funcs.get_aperf_mperf_shift)
cpu->aperf_mperf_shift = pstate_funcs.get_aperf_mperf_shift();
if (pstate_funcs.get_vid)
pstate_funcs.get_vid(cpu);
intel_pstate_set_min_pstate(cpu);
}
/*
* Long hold time will keep high perf limits for long time,
* which negatively impacts perf/watt for some workloads,
* like specpower. 3ms is based on experiements on some
* workoads.
*/
static int hwp_boost_hold_time_ns = 3 * NSEC_PER_MSEC;
static inline void intel_pstate_hwp_boost_up(struct cpudata *cpu)
{
u64 hwp_req = READ_ONCE(cpu->hwp_req_cached);
u32 max_limit = (hwp_req & 0xff00) >> 8;
u32 min_limit = (hwp_req & 0xff);
u32 boost_level1;
/*
* Cases to consider (User changes via sysfs or boot time):
* If, P0 (Turbo max) = P1 (Guaranteed max) = min:
* No boost, return.
* If, P0 (Turbo max) > P1 (Guaranteed max) = min:
* Should result in one level boost only for P0.
* If, P0 (Turbo max) = P1 (Guaranteed max) > min:
* Should result in two level boost:
* (min + p1)/2 and P1.
* If, P0 (Turbo max) > P1 (Guaranteed max) > min:
* Should result in three level boost:
* (min + p1)/2, P1 and P0.
*/
/* If max and min are equal or already at max, nothing to boost */
if (max_limit == min_limit || cpu->hwp_boost_min >= max_limit)
return;
if (!cpu->hwp_boost_min)
cpu->hwp_boost_min = min_limit;
/* level at half way mark between min and guranteed */
boost_level1 = (HWP_GUARANTEED_PERF(cpu->hwp_cap_cached) + min_limit) >> 1;
if (cpu->hwp_boost_min < boost_level1)
cpu->hwp_boost_min = boost_level1;
else if (cpu->hwp_boost_min < HWP_GUARANTEED_PERF(cpu->hwp_cap_cached))
cpu->hwp_boost_min = HWP_GUARANTEED_PERF(cpu->hwp_cap_cached);
else if (cpu->hwp_boost_min == HWP_GUARANTEED_PERF(cpu->hwp_cap_cached) &&
max_limit != HWP_GUARANTEED_PERF(cpu->hwp_cap_cached))
cpu->hwp_boost_min = max_limit;
else
return;
hwp_req = (hwp_req & ~GENMASK_ULL(7, 0)) | cpu->hwp_boost_min;
wrmsrl(MSR_HWP_REQUEST, hwp_req);
cpu->last_update = cpu->sample.time;
}
static inline void intel_pstate_hwp_boost_down(struct cpudata *cpu)
{
if (cpu->hwp_boost_min) {
bool expired;
/* Check if we are idle for hold time to boost down */
expired = time_after64(cpu->sample.time, cpu->last_update +
hwp_boost_hold_time_ns);
if (expired) {
wrmsrl(MSR_HWP_REQUEST, cpu->hwp_req_cached);
cpu->hwp_boost_min = 0;
}
}
cpu->last_update = cpu->sample.time;
}
static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu,
u64 time)
{
cpu->sample.time = time;
if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) {
bool do_io = false;
cpu->sched_flags = 0;
/*
* Set iowait_boost flag and update time. Since IO WAIT flag
* is set all the time, we can't just conclude that there is
* some IO bound activity is scheduled on this CPU with just
* one occurrence. If we receive at least two in two
* consecutive ticks, then we treat as boost candidate.
*/
if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC))
do_io = true;
cpu->last_io_update = time;
if (do_io)
intel_pstate_hwp_boost_up(cpu);
} else {
intel_pstate_hwp_boost_down(cpu);
}
}
static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
u64 time, unsigned int flags)
{
struct cpudata *cpu = container_of(data, struct cpudata, update_util);
cpu->sched_flags |= flags;
if (smp_processor_id() == cpu->cpu)
intel_pstate_update_util_hwp_local(cpu, time);
}
static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
{
struct sample *sample = &cpu->sample;
sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf);
}
static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
{
u64 aperf, mperf;
unsigned long flags;
u64 tsc;
local_irq_save(flags);
rdmsrl(MSR_IA32_APERF, aperf);
rdmsrl(MSR_IA32_MPERF, mperf);
tsc = rdtsc();
if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) {
local_irq_restore(flags);
return false;
}
local_irq_restore(flags);
cpu->last_sample_time = cpu->sample.time;
cpu->sample.time = time;
cpu->sample.aperf = aperf;
cpu->sample.mperf = mperf;
cpu->sample.tsc = tsc;
cpu->sample.aperf -= cpu->prev_aperf;
cpu->sample.mperf -= cpu->prev_mperf;
cpu->sample.tsc -= cpu->prev_tsc;
cpu->prev_aperf = aperf;
cpu->prev_mperf = mperf;
cpu->prev_tsc = tsc;
/*
* First time this function is invoked in a given cycle, all of the
* previous sample data fields are equal to zero or stale and they must
* be populated with meaningful numbers for things to work, so assume
* that sample.time will always be reset before setting the utilization
* update hook and make the caller skip the sample then.
*/
if (cpu->last_sample_time) {
intel_pstate_calc_avg_perf(cpu);
return true;
}
return false;
}
static inline int32_t get_avg_frequency(struct cpudata *cpu)
{
return mul_ext_fp(cpu->sample.core_avg_perf, cpu_khz);
}
static inline int32_t get_avg_pstate(struct cpudata *cpu)
{
return mul_ext_fp(cpu->pstate.max_pstate_physical,
cpu->sample.core_avg_perf);
}
static inline int32_t get_target_pstate(struct cpudata *cpu)
{
struct sample *sample = &cpu->sample;
int32_t busy_frac;
int target, avg_pstate;
busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
sample->tsc);
if (busy_frac < cpu->iowait_boost)
busy_frac = cpu->iowait_boost;
sample->busy_scaled = busy_frac * 100;
target = global.no_turbo || global.turbo_disabled ?
cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
target += target >> 2;
target = mul_fp(target, busy_frac);
if (target < cpu->pstate.min_pstate)
target = cpu->pstate.min_pstate;
/*
* If the average P-state during the previous cycle was higher than the
* current target, add 50% of the difference to the target to reduce
* possible performance oscillations and offset possible performance
* loss related to moving the workload from one CPU to another within
* a package/module.
*/
avg_pstate = get_avg_pstate(cpu);
if (avg_pstate > target)
target += (avg_pstate - target) >> 1;
return target;
}
static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate)
{
int min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio);
int max_pstate = max(min_pstate, cpu->max_perf_ratio);
return clamp_t(int, pstate, min_pstate, max_pstate);
}
static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate)
{
if (pstate == cpu->pstate.current_pstate)
return;
cpu->pstate.current_pstate = pstate;
wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate));
}
static void intel_pstate_adjust_pstate(struct cpudata *cpu)
{
int from = cpu->pstate.current_pstate;
struct sample *sample;
int target_pstate;
update_turbo_state();
target_pstate = get_target_pstate(cpu);
target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu);
intel_pstate_update_pstate(cpu, target_pstate);
sample = &cpu->sample;
trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf),
fp_toint(sample->busy_scaled),
from,
cpu->pstate.current_pstate,
sample->mperf,
sample->aperf,
sample->tsc,
get_avg_frequency(cpu),
fp_toint(cpu->iowait_boost * 100));
}
static void intel_pstate_update_util(struct update_util_data *data, u64 time,
unsigned int flags)
{
struct cpudata *cpu = container_of(data, struct cpudata, update_util);
u64 delta_ns;
/* Don't allow remote callbacks */
if (smp_processor_id() != cpu->cpu)
return;
delta_ns = time - cpu->last_update;
if (flags & SCHED_CPUFREQ_IOWAIT) {
/* Start over if the CPU may have been idle. */
if (delta_ns > TICK_NSEC) {
cpu->iowait_boost = ONE_EIGHTH_FP;
} else if (cpu->iowait_boost >= ONE_EIGHTH_FP) {
cpu->iowait_boost <<= 1;
if (cpu->iowait_boost > int_tofp(1))
cpu->iowait_boost = int_tofp(1);
} else {
cpu->iowait_boost = ONE_EIGHTH_FP;
}
} else if (cpu->iowait_boost) {
/* Clear iowait_boost if the CPU may have been idle. */
if (delta_ns > TICK_NSEC)
cpu->iowait_boost = 0;
else
cpu->iowait_boost >>= 1;
}
cpu->last_update = time;
delta_ns = time - cpu->sample.time;
if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL)
return;
if (intel_pstate_sample(cpu, time))
intel_pstate_adjust_pstate(cpu);
}
static struct pstate_funcs core_funcs = {
.get_max = core_get_max_pstate,
.get_max_physical = core_get_max_pstate_physical,
.get_min = core_get_min_pstate,
.get_turbo = core_get_turbo_pstate,
.get_scaling = core_get_scaling,
.get_val = core_get_val,
};
static const struct pstate_funcs silvermont_funcs = {
.get_max = atom_get_max_pstate,
.get_max_physical = atom_get_max_pstate,
.get_min = atom_get_min_pstate,
.get_turbo = atom_get_turbo_pstate,
.get_val = atom_get_val,
.get_scaling = silvermont_get_scaling,
.get_vid = atom_get_vid,
};
static const struct pstate_funcs airmont_funcs = {
.get_max = atom_get_max_pstate,
.get_max_physical = atom_get_max_pstate,
.get_min = atom_get_min_pstate,
.get_turbo = atom_get_turbo_pstate,
.get_val = atom_get_val,
.get_scaling = airmont_get_scaling,
.get_vid = atom_get_vid,
};
static const struct pstate_funcs knl_funcs = {
.get_max = core_get_max_pstate,
.get_max_physical = core_get_max_pstate_physical,
.get_min = core_get_min_pstate,
.get_turbo = knl_get_turbo_pstate,
.get_aperf_mperf_shift = knl_get_aperf_mperf_shift,
.get_scaling = core_get_scaling,
.get_val = core_get_val,
};
#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(INTEL_FAM6_SANDYBRIDGE, core_funcs),
ICPU(INTEL_FAM6_SANDYBRIDGE_X, core_funcs),
ICPU(INTEL_FAM6_ATOM_SILVERMONT, silvermont_funcs),
ICPU(INTEL_FAM6_IVYBRIDGE, core_funcs),
ICPU(INTEL_FAM6_HASWELL, core_funcs),
ICPU(INTEL_FAM6_BROADWELL, core_funcs),
ICPU(INTEL_FAM6_IVYBRIDGE_X, core_funcs),
ICPU(INTEL_FAM6_HASWELL_X, core_funcs),
ICPU(INTEL_FAM6_HASWELL_L, core_funcs),
ICPU(INTEL_FAM6_HASWELL_G, core_funcs),
ICPU(INTEL_FAM6_BROADWELL_G, core_funcs),
ICPU(INTEL_FAM6_ATOM_AIRMONT, airmont_funcs),
ICPU(INTEL_FAM6_SKYLAKE_L, core_funcs),
ICPU(INTEL_FAM6_BROADWELL_X, core_funcs),
ICPU(INTEL_FAM6_SKYLAKE, core_funcs),
ICPU(INTEL_FAM6_BROADWELL_D, core_funcs),
ICPU(INTEL_FAM6_XEON_PHI_KNL, knl_funcs),
ICPU(INTEL_FAM6_XEON_PHI_KNM, knl_funcs),
ICPU(INTEL_FAM6_ATOM_GOLDMONT, core_funcs),
ICPU(INTEL_FAM6_ATOM_GOLDMONT_PLUS, core_funcs),
ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs),
{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
ICPU(INTEL_FAM6_BROADWELL_D, core_funcs),
ICPU(INTEL_FAM6_BROADWELL_X, core_funcs),
ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs),
{}
};
static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
ICPU(INTEL_FAM6_KABYLAKE, core_funcs),
{}
};
static const struct x86_cpu_id intel_pstate_hwp_boost_ids[] = {
ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs),
ICPU(INTEL_FAM6_SKYLAKE, core_funcs),
{}
};
static int intel_pstate_init_cpu(unsigned int cpunum)
{
struct cpudata *cpu;
cpu = all_cpu_data[cpunum];
if (!cpu) {
cpu = kzalloc(sizeof(*cpu), GFP_KERNEL);
if (!cpu)
return -ENOMEM;
all_cpu_data[cpunum] = cpu;
cpu->epp_default = -EINVAL;
cpu->epp_powersave = -EINVAL;
cpu->epp_saved = -EINVAL;
}
cpu = all_cpu_data[cpunum];
cpu->cpu = cpunum;
if (hwp_active) {
const struct x86_cpu_id *id;
id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids);
if (id)
intel_pstate_disable_ee(cpunum);
intel_pstate_hwp_enable(cpu);
id = x86_match_cpu(intel_pstate_hwp_boost_ids);
if (id && intel_pstate_acpi_pm_profile_server())
hwp_boost = true;
}
intel_pstate_get_cpu_pstates(cpu);
pr_debug("controlling: cpu %d\n", cpunum);
return 0;
}
static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
{
struct cpudata *cpu = all_cpu_data[cpu_num];
if (hwp_active && !hwp_boost)
return;
if (cpu->update_util_set)
return;
/* Prevent intel_pstate_update_util() from using stale data. */
cpu->sample.time = 0;
cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
(hwp_active ?
intel_pstate_update_util_hwp :
intel_pstate_update_util));
cpu->update_util_set = true;
}
static void intel_pstate_clear_update_util_hook(unsigned int cpu)
{
struct cpudata *cpu_data = all_cpu_data[cpu];
if (!cpu_data->update_util_set)
return;
cpufreq_remove_update_util_hook(cpu);
cpu_data->update_util_set = false;
synchronize_rcu();
}
static int intel_pstate_get_max_freq(struct cpudata *cpu)
{
return global.turbo_disabled || global.no_turbo ?
cpu->pstate.max_freq : cpu->pstate.turbo_freq;
}
static void intel_pstate_update_perf_limits(struct cpudata *cpu,
unsigned int policy_min,
unsigned int policy_max)
{
int max_freq = intel_pstate_get_max_freq(cpu);
int32_t max_policy_perf, min_policy_perf;
int max_state, turbo_max;
/*
* HWP needs some special consideration, because on BDX the
* HWP_REQUEST uses abstract value to represent performance
* rather than pure ratios.
*/
if (hwp_active) {
intel_pstate_get_hwp_max(cpu->cpu, &turbo_max, &max_state);
} else {
max_state = global.no_turbo || global.turbo_disabled ?
cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
turbo_max = cpu->pstate.turbo_pstate;
}
max_policy_perf = max_state * policy_max / max_freq;
if (policy_max == policy_min) {
min_policy_perf = max_policy_perf;
} else {
min_policy_perf = max_state * policy_min / max_freq;
min_policy_perf = clamp_t(int32_t, min_policy_perf,
0, max_policy_perf);
}
pr_debug("cpu:%d max_state %d min_policy_perf:%d max_policy_perf:%d\n",
cpu->cpu, max_state, min_policy_perf, max_policy_perf);
/* Normalize user input to [min_perf, max_perf] */
if (per_cpu_limits) {
cpu->min_perf_ratio = min_policy_perf;
cpu->max_perf_ratio = max_policy_perf;
} else {
int32_t global_min, global_max;
/* Global limits are in percent of the maximum turbo P-state. */
global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
global_min = clamp_t(int32_t, global_min, 0, global_max);
pr_debug("cpu:%d global_min:%d global_max:%d\n", cpu->cpu,
global_min, global_max);
cpu->min_perf_ratio = max(min_policy_perf, global_min);
cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf);
cpu->max_perf_ratio = min(max_policy_perf, global_max);
cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio);
/* Make sure min_perf <= max_perf */
cpu->min_perf_ratio = min(cpu->min_perf_ratio,
cpu->max_perf_ratio);
}
pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", cpu->cpu,
cpu->max_perf_ratio,
cpu->min_perf_ratio);
}
static int intel_pstate_set_policy(struct cpufreq_policy *policy)
{
struct cpudata *cpu;
if (!policy->cpuinfo.max_freq)
return -ENODEV;
pr_debug("set_policy cpuinfo.max %u policy->max %u\n",
policy->cpuinfo.max_freq, policy->max);
cpu = all_cpu_data[policy->cpu];
cpu->policy = policy->policy;
mutex_lock(&intel_pstate_limits_lock);
intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) {
/*
* NOHZ_FULL CPUs need this as the governor callback may not
* be invoked on them.
*/
intel_pstate_clear_update_util_hook(policy->cpu);
intel_pstate_max_within_limits(cpu);
} else {
intel_pstate_set_update_util_hook(policy->cpu);
}
if (hwp_active) {
/*
* When hwp_boost was active before and dynamically it
* was turned off, in that case we need to clear the
* update util hook.
*/
if (!hwp_boost)
intel_pstate_clear_update_util_hook(policy->cpu);
intel_pstate_hwp_set(policy->cpu);
}
mutex_unlock(&intel_pstate_limits_lock);
return 0;
}
static void intel_pstate_adjust_policy_max(struct cpudata *cpu,
struct cpufreq_policy_data *policy)
{
if (!hwp_active &&
cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate &&
policy->max < policy->cpuinfo.max_freq &&
policy->max > cpu->pstate.max_freq) {
pr_debug("policy->max > max non turbo frequency\n");
policy->max = policy->cpuinfo.max_freq;
}
}
static int intel_pstate_verify_policy(struct cpufreq_policy_data *policy)
{
struct cpudata *cpu = all_cpu_data[policy->cpu];
update_turbo_state();
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
intel_pstate_get_max_freq(cpu));
intel_pstate_adjust_policy_max(cpu, policy);
return 0;
}
static void intel_cpufreq_stop_cpu(struct cpufreq_policy *policy)
{
intel_pstate_set_min_pstate(all_cpu_data[policy->cpu]);
}
static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
{
pr_debug("CPU %d exiting\n", policy->cpu);
intel_pstate_clear_update_util_hook(policy->cpu);
if (hwp_active) {
intel_pstate_hwp_save_state(policy);
intel_pstate_hwp_force_min_perf(policy->cpu);
} else {
intel_cpufreq_stop_cpu(policy);
}
}
static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
{
intel_pstate_exit_perf_limits(policy);
policy->fast_switch_possible = false;
return 0;
}
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];
cpu->max_perf_ratio = 0xFF;
cpu->min_perf_ratio = 0;
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;
update_turbo_state();
global.turbo_disabled_mf = global.turbo_disabled;
policy->cpuinfo.max_freq = global.turbo_disabled ?
cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
policy->cpuinfo.max_freq *= cpu->pstate.scaling;
if (hwp_active) {
unsigned int max_freq;
max_freq = global.turbo_disabled ?
cpu->pstate.max_freq : cpu->pstate.turbo_freq;
if (max_freq < policy->cpuinfo.max_freq)
policy->cpuinfo.max_freq = max_freq;
}
intel_pstate_init_acpi_perf_limits(policy);
policy->fast_switch_possible = true;
return 0;
}
static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
{
int ret = __intel_pstate_cpu_init(policy);
if (ret)
return ret;
if (IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE))
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
else
policy->policy = CPUFREQ_POLICY_POWERSAVE;
return 0;
}
static struct cpufreq_driver intel_pstate = {
.flags = CPUFREQ_CONST_LOOPS,
.verify = intel_pstate_verify_policy,
.setpolicy = intel_pstate_set_policy,
.suspend = intel_pstate_hwp_save_state,
.resume = intel_pstate_resume,
.init = intel_pstate_cpu_init,
.exit = intel_pstate_cpu_exit,
.stop_cpu = intel_pstate_stop_cpu,
.update_limits = intel_pstate_update_limits,
.name = "intel_pstate",
};
static int intel_cpufreq_verify_policy(struct cpufreq_policy_data *policy)
{
struct cpudata *cpu = all_cpu_data[policy->cpu];
update_turbo_state();
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
intel_pstate_get_max_freq(cpu));
intel_pstate_adjust_policy_max(cpu, policy);
intel_pstate_update_perf_limits(cpu, policy->min, policy->max);
return 0;
}
/* Use of trace in passive mode:
*
* In passive mode the trace core_busy field (also known as the
* performance field, and lablelled as such on the graphs; also known as
* core_avg_perf) is not needed and so is re-assigned to indicate if the
* driver call was via the normal or fast switch path. Various graphs
* output from the intel_pstate_tracer.py utility that include core_busy
* (or performance or core_avg_perf) have a fixed y-axis from 0 to 100%,
* so we use 10 to indicate the the normal path through the driver, and
* 90 to indicate the fast switch path through the driver.
* The scaled_busy field is not used, and is set to 0.
*/
#define INTEL_PSTATE_TRACE_TARGET 10
#define INTEL_PSTATE_TRACE_FAST_SWITCH 90
static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, int old_pstate)
{
struct sample *sample;
if (!trace_pstate_sample_enabled())
return;
if (!intel_pstate_sample(cpu, ktime_get()))
return;
sample = &cpu->sample;
trace_pstate_sample(trace_type,
0,
old_pstate,
cpu->pstate.current_pstate,
sample->mperf,
sample->aperf,
sample->tsc,
get_avg_frequency(cpu),
fp_toint(cpu->iowait_boost * 100));
}
static int intel_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
struct cpudata *cpu = all_cpu_data[policy->cpu];
struct cpufreq_freqs freqs;
int target_pstate, old_pstate;
update_turbo_state();
freqs.old = policy->cur;
freqs.new = target_freq;
cpufreq_freq_transition_begin(policy, &freqs);
switch (relation) {
case CPUFREQ_RELATION_L:
target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling);
break;
case CPUFREQ_RELATION_H:
target_pstate = freqs.new / cpu->pstate.scaling;
break;
default:
target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling);
break;
}
target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
old_pstate = cpu->pstate.current_pstate;
if (target_pstate != cpu->pstate.current_pstate) {
cpu->pstate.current_pstate = target_pstate;
wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL,
pstate_funcs.get_val(cpu, target_pstate));
}
freqs.new = target_pstate * cpu->pstate.scaling;
intel_cpufreq_trace(cpu, INTEL_PSTATE_TRACE_TARGET, old_pstate);
cpufreq_freq_transition_end(policy, &freqs, false);
return 0;
}
static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpudata *cpu = all_cpu_data[policy->cpu];
int target_pstate, old_pstate;
update_turbo_state();
target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling);
target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
old_pstate = cpu->pstate.current_pstate;
intel_pstate_update_pstate(cpu, target_pstate);
intel_cpufreq_trace(cpu, INTEL_PSTATE_TRACE_FAST_SWITCH, old_pstate);
return target_pstate * cpu->pstate.scaling;
}
static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
int max_state, turbo_max, min_freq, max_freq, ret;
struct freq_qos_request *req;
struct cpudata *cpu;
struct device *dev;
dev = get_cpu_device(policy->cpu);
if (!dev)
return -ENODEV;
ret = __intel_pstate_cpu_init(policy);
if (ret)
return ret;
policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY;
policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY;
/* This reflects the intel_pstate_get_cpu_pstates() setting. */
policy->cur = policy->cpuinfo.min_freq;
req = kcalloc(2, sizeof(*req), GFP_KERNEL);
if (!req) {
ret = -ENOMEM;
goto pstate_exit;
}
cpu = all_cpu_data[policy->cpu];
if (hwp_active)
intel_pstate_get_hwp_max(policy->cpu, &turbo_max, &max_state);
else
turbo_max = cpu->pstate.turbo_pstate;
min_freq = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100);
min_freq *= cpu->pstate.scaling;
max_freq = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100);
max_freq *= cpu->pstate.scaling;
ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MIN,
min_freq);
if (ret < 0) {
dev_err(dev, "Failed to add min-freq constraint (%d)\n", ret);
goto free_req;
}
ret = freq_qos_add_request(&policy->constraints, req + 1, FREQ_QOS_MAX,
max_freq);
if (ret < 0) {
dev_err(dev, "Failed to add max-freq constraint (%d)\n", ret);
goto remove_min_req;
}
policy->driver_data = req;
return 0;
remove_min_req:
freq_qos_remove_request(req);
free_req:
kfree(req);
pstate_exit:
intel_pstate_exit_perf_limits(policy);
return ret;
}
static int intel_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
struct freq_qos_request *req;
req = policy->driver_data;
freq_qos_remove_request(req + 1);
freq_qos_remove_request(req);
kfree(req);
return intel_pstate_cpu_exit(policy);
}
static struct cpufreq_driver intel_cpufreq = {
.flags = CPUFREQ_CONST_LOOPS,
.verify = intel_cpufreq_verify_policy,
.target = intel_cpufreq_target,
.fast_switch = intel_cpufreq_fast_switch,
.init = intel_cpufreq_cpu_init,
.exit = intel_cpufreq_cpu_exit,
.stop_cpu = intel_cpufreq_stop_cpu,
.update_limits = intel_pstate_update_limits,
.name = "intel_cpufreq",
};
static struct cpufreq_driver *default_driver = &intel_pstate;
static void intel_pstate_driver_cleanup(void)
{
unsigned int cpu;
get_online_cpus();
for_each_online_cpu(cpu) {
if (all_cpu_data[cpu]) {
if (intel_pstate_driver == &intel_pstate)
intel_pstate_clear_update_util_hook(cpu);
kfree(all_cpu_data[cpu]);
all_cpu_data[cpu] = NULL;
}
}
put_online_cpus();
intel_pstate_driver = NULL;
}
static int intel_pstate_register_driver(struct cpufreq_driver *driver)
{
int ret;
memset(&global, 0, sizeof(global));
global.max_perf_pct = 100;
intel_pstate_driver = driver;
ret = cpufreq_register_driver(intel_pstate_driver);
if (ret) {
intel_pstate_driver_cleanup();
return ret;
}
global.min_perf_pct = min_perf_pct_min();
return 0;
}
static int intel_pstate_unregister_driver(void)
{
if (hwp_active)
return -EBUSY;
cpufreq_unregister_driver(intel_pstate_driver);
intel_pstate_driver_cleanup();
return 0;
}
static ssize_t intel_pstate_show_status(char *buf)
{
if (!intel_pstate_driver)
return sprintf(buf, "off\n");
return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
"active" : "passive");
}
static int intel_pstate_update_status(const char *buf, size_t size)
{
int ret;
if (size == 3 && !strncmp(buf, "off", size))
return intel_pstate_driver ?
intel_pstate_unregister_driver() : -EINVAL;
if (size == 6 && !strncmp(buf, "active", size)) {
if (intel_pstate_driver) {
if (intel_pstate_driver == &intel_pstate)
return 0;
ret = intel_pstate_unregister_driver();
if (ret)
return ret;
}
return intel_pstate_register_driver(&intel_pstate);
}
if (size == 7 && !strncmp(buf, "passive", size)) {
if (intel_pstate_driver) {
if (intel_pstate_driver == &intel_cpufreq)
return 0;
ret = intel_pstate_unregister_driver();
if (ret)
return ret;
}
return intel_pstate_register_driver(&intel_cpufreq);
}
return -EINVAL;
}
static int no_load __initdata;
static int no_hwp __initdata;
static int hwp_only __initdata;
static unsigned int force_load __initdata;
static int __init intel_pstate_msrs_not_valid(void)
{
if (!pstate_funcs.get_max() ||
!pstate_funcs.get_min() ||
!pstate_funcs.get_turbo())
return -ENODEV;
return 0;
}
static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
{
pstate_funcs.get_max = funcs->get_max;
pstate_funcs.get_max_physical = funcs->get_max_physical;
pstate_funcs.get_min = funcs->get_min;
pstate_funcs.get_turbo = funcs->get_turbo;
pstate_funcs.get_scaling = funcs->get_scaling;
pstate_funcs.get_val = funcs->get_val;
pstate_funcs.get_vid = funcs->get_vid;
pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
}
#ifdef CONFIG_ACPI
static bool __init 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);
}
pr_debug("ACPI _PSS not found\n");
return true;
}
static bool __init intel_pstate_no_acpi_pcch(void)
{
acpi_status status;
acpi_handle handle;
status = acpi_get_handle(NULL, "\\_SB", &handle);
if (ACPI_FAILURE(status))
goto not_found;
if (acpi_has_method(handle, "PCCH"))
return false;
not_found:
pr_debug("ACPI PCCH not found\n");
return true;
}
static bool __init 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;
}
pr_debug("ACPI _PPC not found\n");
return false;
}
enum {
PSS,
PPC,
};
/* Hardware vendor-specific info that has its own power management modes */
static struct acpi_platform_list plat_info[] __initdata = {
{"HP ", "ProLiant", 0, ACPI_SIG_FADT, all_versions, NULL, PSS},
{"ORACLE", "X4-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X3-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X3-2L ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X3-2B ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4470M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4270M3 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4270M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4170M2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4170 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X4275 M3", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "X6-2 ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{"ORACLE", "Sudbury ", 0, ACPI_SIG_FADT, all_versions, NULL, PPC},
{ } /* End */
};
static bool __init intel_pstate_platform_pwr_mgmt_exists(void)
{
const struct x86_cpu_id *id;
u64 misc_pwr;
int idx;
id = x86_match_cpu(intel_pstate_cpu_oob_ids);
if (id) {
rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
if (misc_pwr & (1 << 8)) {
pr_debug("Bit 8 in the MISC_PWR_MGMT MSR set\n");
return true;
}
}
idx = acpi_match_platform_list(plat_info);
if (idx < 0)
return false;
switch (plat_info[idx].data) {
case PSS:
if (!intel_pstate_no_acpi_pss())
return false;
return intel_pstate_no_acpi_pcch();
case PPC:
return intel_pstate_has_acpi_ppc() && !force_load;
}
return false;
}
static void intel_pstate_request_control_from_smm(void)
{
/*
* It may be unsafe to request P-states control from SMM if _PPC support
* has not been enabled.
*/
if (acpi_ppc)
acpi_processor_pstate_control();
}
#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; }
static inline void intel_pstate_request_control_from_smm(void) {}
#endif /* CONFIG_ACPI */
#define INTEL_PSTATE_HWP_BROADWELL 0x01
#define ICPU_HWP(model, hwp_mode) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_HWP, hwp_mode }
static const struct x86_cpu_id hwp_support_ids[] __initconst = {
ICPU_HWP(INTEL_FAM6_BROADWELL_X, INTEL_PSTATE_HWP_BROADWELL),
ICPU_HWP(INTEL_FAM6_BROADWELL_D, INTEL_PSTATE_HWP_BROADWELL),
ICPU_HWP(X86_MODEL_ANY, 0),
{}
};
static int __init intel_pstate_init(void)
{
const struct x86_cpu_id *id;
int rc;
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return -ENODEV;
if (no_load)
return -ENODEV;
id = x86_match_cpu(hwp_support_ids);
if (id) {
copy_cpu_funcs(&core_funcs);
if (!no_hwp) {
hwp_active++;
hwp_mode_bdw = id->driver_data;
intel_pstate.attr = hwp_cpufreq_attrs;
goto hwp_cpu_matched;
}
} else {
id = x86_match_cpu(intel_pstate_cpu_ids);
if (!id) {
pr_info("CPU model not supported\n");
return -ENODEV;
}
copy_cpu_funcs((struct pstate_funcs *)id->driver_data);
}
if (intel_pstate_msrs_not_valid()) {
pr_info("Invalid MSRs\n");
return -ENODEV;
}
hwp_cpu_matched:
/*
* The Intel pstate driver will be ignored if the platform
* firmware has its own power management modes.
*/
if (intel_pstate_platform_pwr_mgmt_exists()) {
pr_info("P-states controlled by the platform\n");
return -ENODEV;
}
if (!hwp_active && hwp_only)
return -ENOTSUPP;
pr_info("Intel P-state driver initializing\n");
all_cpu_data = vzalloc(array_size(sizeof(void *), num_possible_cpus()));
if (!all_cpu_data)
return -ENOMEM;
intel_pstate_request_control_from_smm();
intel_pstate_sysfs_expose_params();
mutex_lock(&intel_pstate_driver_lock);
rc = intel_pstate_register_driver(default_driver);
mutex_unlock(&intel_pstate_driver_lock);
if (rc)
return rc;
if (hwp_active)
pr_info("HWP enabled\n");
return 0;
}
device_initcall(intel_pstate_init);
static int __init intel_pstate_setup(char *str)
{
if (!str)
return -EINVAL;
if (!strcmp(str, "disable")) {
no_load = 1;
} else if (!strcmp(str, "passive")) {
pr_info("Passive mode enabled\n");
default_driver = &intel_cpufreq;
no_hwp = 1;
}
if (!strcmp(str, "no_hwp")) {
pr_info("HWP disabled\n");
no_hwp = 1;
}
if (!strcmp(str, "force"))
force_load = 1;
if (!strcmp(str, "hwp_only"))
hwp_only = 1;
if (!strcmp(str, "per_cpu_perf_limits"))
per_cpu_limits = true;
#ifdef CONFIG_ACPI
if (!strcmp(str, "support_acpi_ppc"))
acpi_ppc = true;
#endif
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");
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