cpufreq: intel_pstate: Use ACPI perf configuration
Use ACPI _PSS to limit the Intel P State turbo, max and min ratios. This driver uses acpi processor perf lib calls to register performance. The following logic is used to adjust Intel P state driver limits: - If there is no turbo entry in _PSS, then disable Intel P state turbo and limit to non turbo max - If the non turbo max ratio is more than _PSS max non turbo value, then set the max non turbo ratio to _PSS non turbo max - If the min ratio is less than _PSS min then change the min ratio matching _PSS min - Scale the _PSS turbo frequency to max turbo frequency based on control value. This feature can be disabled by using kernel parameters: intel_pstate=no_acpi Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
parent
3bcc6fa971
commit
37afb00032
|
@ -5,6 +5,7 @@
|
|||
config X86_INTEL_PSTATE
|
||||
bool "Intel P state control"
|
||||
depends on X86
|
||||
select ACPI_PROCESSOR if ACPI
|
||||
help
|
||||
This driver provides a P state for Intel core processors.
|
||||
The driver implements an internal governor and will become
|
||||
|
|
|
@ -34,6 +34,10 @@
|
|||
#include <asm/cpu_device_id.h>
|
||||
#include <asm/cpufeature.h>
|
||||
|
||||
#if IS_ENABLED(CONFIG_ACPI)
|
||||
#include <acpi/processor.h>
|
||||
#endif
|
||||
|
||||
#define BYT_RATIOS 0x66a
|
||||
#define BYT_VIDS 0x66b
|
||||
#define BYT_TURBO_RATIOS 0x66c
|
||||
|
@ -113,6 +117,9 @@ struct cpudata {
|
|||
u64 prev_mperf;
|
||||
u64 prev_tsc;
|
||||
struct sample sample;
|
||||
#if IS_ENABLED(CONFIG_ACPI)
|
||||
struct acpi_processor_performance acpi_perf_data;
|
||||
#endif
|
||||
};
|
||||
|
||||
static struct cpudata **all_cpu_data;
|
||||
|
@ -143,6 +150,7 @@ struct cpu_defaults {
|
|||
static struct pstate_adjust_policy pid_params;
|
||||
static struct pstate_funcs pstate_funcs;
|
||||
static int hwp_active;
|
||||
static int no_acpi_perf;
|
||||
|
||||
struct perf_limits {
|
||||
int no_turbo;
|
||||
|
@ -170,6 +178,153 @@ static struct perf_limits limits = {
|
|||
.min_sysfs_pct = 0,
|
||||
};
|
||||
|
||||
#if IS_ENABLED(CONFIG_ACPI)
|
||||
/*
|
||||
* The max target pstate ratio is a 8 bit value in both PLATFORM_INFO MSR and
|
||||
* in TURBO_RATIO_LIMIT MSR, which pstate driver stores in max_pstate and
|
||||
* max_turbo_pstate fields. The PERF_CTL MSR contains 16 bit value for P state
|
||||
* ratio, out of it only high 8 bits are used. For example 0x1700 is setting
|
||||
* target ratio 0x17. The _PSS control value stores in a format which can be
|
||||
* directly written to PERF_CTL MSR. But in intel_pstate driver this shift
|
||||
* occurs during write to PERF_CTL (E.g. for cores core_set_pstate()).
|
||||
* This function converts the _PSS control value to intel pstate driver format
|
||||
* for comparison and assignment.
|
||||
*/
|
||||
static int convert_to_native_pstate_format(struct cpudata *cpu, int index)
|
||||
{
|
||||
return cpu->acpi_perf_data.states[index].control >> 8;
|
||||
}
|
||||
|
||||
static int intel_pstate_init_perf_limits(struct cpufreq_policy *policy)
|
||||
{
|
||||
struct cpudata *cpu;
|
||||
int ret;
|
||||
bool turbo_absent = false;
|
||||
int max_pstate_index;
|
||||
int min_pss_ctl, max_pss_ctl, turbo_pss_ctl;
|
||||
int i;
|
||||
|
||||
cpu = all_cpu_data[policy->cpu];
|
||||
|
||||
pr_debug("intel_pstate: default limits 0x%x 0x%x 0x%x\n",
|
||||
cpu->pstate.min_pstate, cpu->pstate.max_pstate,
|
||||
cpu->pstate.turbo_pstate);
|
||||
|
||||
if (!cpu->acpi_perf_data.shared_cpu_map &&
|
||||
zalloc_cpumask_var_node(&cpu->acpi_perf_data.shared_cpu_map,
|
||||
GFP_KERNEL, cpu_to_node(policy->cpu))) {
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
ret = acpi_processor_register_performance(&cpu->acpi_perf_data,
|
||||
policy->cpu);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* 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)
|
||||
return -EIO;
|
||||
|
||||
pr_debug("intel_pstate: 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);
|
||||
|
||||
/*
|
||||
* 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)
|
||||
return 0;
|
||||
|
||||
turbo_pss_ctl = convert_to_native_pstate_format(cpu, 0);
|
||||
min_pss_ctl = convert_to_native_pstate_format(cpu,
|
||||
cpu->acpi_perf_data.state_count - 1);
|
||||
/* Check if there is a turbo freq in _PSS */
|
||||
if (turbo_pss_ctl <= cpu->pstate.max_pstate &&
|
||||
turbo_pss_ctl > cpu->pstate.min_pstate) {
|
||||
pr_debug("intel_pstate: no turbo range exists in _PSS\n");
|
||||
limits.no_turbo = limits.turbo_disabled = 1;
|
||||
cpu->pstate.turbo_pstate = cpu->pstate.max_pstate;
|
||||
turbo_absent = true;
|
||||
}
|
||||
|
||||
/* Check if the max non turbo p state < Intel P state max */
|
||||
max_pstate_index = turbo_absent ? 0 : 1;
|
||||
max_pss_ctl = convert_to_native_pstate_format(cpu, max_pstate_index);
|
||||
if (max_pss_ctl < cpu->pstate.max_pstate &&
|
||||
max_pss_ctl > cpu->pstate.min_pstate)
|
||||
cpu->pstate.max_pstate = max_pss_ctl;
|
||||
|
||||
/* check If min perf > Intel P State min */
|
||||
if (min_pss_ctl > cpu->pstate.min_pstate &&
|
||||
min_pss_ctl < cpu->pstate.max_pstate) {
|
||||
cpu->pstate.min_pstate = min_pss_ctl;
|
||||
policy->cpuinfo.min_freq = min_pss_ctl * cpu->pstate.scaling;
|
||||
}
|
||||
|
||||
if (turbo_absent)
|
||||
policy->cpuinfo.max_freq = cpu->pstate.max_pstate *
|
||||
cpu->pstate.scaling;
|
||||
else {
|
||||
policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate *
|
||||
cpu->pstate.scaling;
|
||||
/*
|
||||
* 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
|
||||
* frequeny. So correct this frequency in _PSS table to
|
||||
* correct max turbo frequency based on the turbo ratio.
|
||||
* Also need to convert to MHz as _PSS freq is in MHz.
|
||||
*/
|
||||
cpu->acpi_perf_data.states[0].core_frequency =
|
||||
turbo_pss_ctl * 100;
|
||||
}
|
||||
|
||||
pr_debug("intel_pstate: Updated limits using _PSS 0x%x 0x%x 0x%x\n",
|
||||
cpu->pstate.min_pstate, cpu->pstate.max_pstate,
|
||||
cpu->pstate.turbo_pstate);
|
||||
pr_debug("intel_pstate: policy max_freq=%d Khz min_freq = %d KHz\n",
|
||||
policy->cpuinfo.max_freq, policy->cpuinfo.min_freq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
|
||||
{
|
||||
struct cpudata *cpu;
|
||||
|
||||
if (!no_acpi_perf)
|
||||
return 0;
|
||||
|
||||
cpu = all_cpu_data[policy->cpu];
|
||||
acpi_processor_unregister_performance(policy->cpu);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else
|
||||
static int intel_pstate_init_perf_limits(struct cpufreq_policy *policy)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
|
||||
int deadband, int integral) {
|
||||
pid->setpoint = setpoint;
|
||||
|
@ -1115,18 +1270,30 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
|
|||
policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
|
||||
policy->cpuinfo.max_freq =
|
||||
cpu->pstate.turbo_pstate * cpu->pstate.scaling;
|
||||
if (!no_acpi_perf)
|
||||
intel_pstate_init_perf_limits(policy);
|
||||
/*
|
||||
* If there is no acpi perf data or error, we ignore and use Intel P
|
||||
* state calculated limits, So this is not fatal error.
|
||||
*/
|
||||
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
|
||||
cpumask_set_cpu(policy->cpu, policy->cpus);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
|
||||
{
|
||||
return intel_pstate_exit_perf_limits(policy);
|
||||
}
|
||||
|
||||
static struct cpufreq_driver intel_pstate_driver = {
|
||||
.flags = CPUFREQ_CONST_LOOPS,
|
||||
.verify = intel_pstate_verify_policy,
|
||||
.setpolicy = intel_pstate_set_policy,
|
||||
.get = intel_pstate_get,
|
||||
.init = intel_pstate_cpu_init,
|
||||
.exit = intel_pstate_cpu_exit,
|
||||
.stop_cpu = intel_pstate_stop_cpu,
|
||||
.name = "intel_pstate",
|
||||
};
|
||||
|
@ -1168,7 +1335,6 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs)
|
|||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_ACPI)
|
||||
#include <acpi/processor.h>
|
||||
|
||||
static bool intel_pstate_no_acpi_pss(void)
|
||||
{
|
||||
|
@ -1360,6 +1526,9 @@ static int __init intel_pstate_setup(char *str)
|
|||
force_load = 1;
|
||||
if (!strcmp(str, "hwp_only"))
|
||||
hwp_only = 1;
|
||||
if (!strcmp(str, "no_acpi"))
|
||||
no_acpi_perf = 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
early_param("intel_pstate", intel_pstate_setup);
|
||||
|
|
Loading…
Reference in a new issue