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cpufreq: intel_pstate: Configurable algorithm to get target pstate 

Target systems using different cpus have different power and performance
requirements. They may use different algorithms to get the next P-state
based on their power or performance preference.

For example, power-constrained systems may not want to use
high-performance P-states as aggressively as a full-size desktop or a
server platform. A server platform may want to run close to the max to
achieve better performance, while laptop-like systems may prefer
sacrificing performance for longer battery lifes.

For the above reasons, modify intel_pstate to allow the target P-state
selection algorithm to be depend on the CPU ID.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Philippe Longepe <philippe.longepe@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Philippe Longepe 2015-12-04 17:40:30 +01:00 committed by Rafael J. Wysocki
parent 40be4c3ccb
commit 157386b6fc
1 changed files with 17 additions and 13 deletions
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30
drivers/cpufreq/intel_pstate.c
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@ -66,6 +66,7 @@ static inline int ceiling_fp(int32_t x)
struct sample {
int32_t core_pct_busy;
int32_t busy_scaled;
u64 aperf;
u64 mperf;
u64 tsc;
@ -133,6 +134,7 @@ struct pstate_funcs {
int (*get_scaling)(void);
void (*set)(struct cpudata*, int pstate);
void (*get_vid)(struct cpudata *);
int32_t (*get_target_pstate)(struct cpudata *);
};
struct cpu_defaults {
@ -140,6 +142,8 @@ struct cpu_defaults {
struct pstate_funcs funcs;
};
static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu);
static struct pstate_adjust_policy pid_params;
static struct pstate_funcs pstate_funcs;
static int hwp_active;
@ -738,6 +742,7 @@ static struct cpu_defaults core_params = {
.get_turbo = core_get_turbo_pstate,
.get_scaling = core_get_scaling,
.set = core_set_pstate,
.get_target_pstate = get_target_pstate_use_performance,
},
};
@ -758,6 +763,7 @@ static struct cpu_defaults silvermont_params = {
.set = atom_set_pstate,
.get_scaling = silvermont_get_scaling,
.get_vid = atom_get_vid,
.get_target_pstate = get_target_pstate_use_performance,
},
};
@ -778,6 +784,7 @@ static struct cpu_defaults airmont_params = {
.set = atom_set_pstate,
.get_scaling = airmont_get_scaling,
.get_vid = atom_get_vid,
.get_target_pstate = get_target_pstate_use_performance,
},
};
@ -797,6 +804,7 @@ static struct cpu_defaults knl_params = {
.get_turbo = knl_get_turbo_pstate,
.get_scaling = core_get_scaling,
.set = core_set_pstate,
.get_target_pstate = get_target_pstate_use_performance,
},
};
@ -922,7 +930,7 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
mod_timer_pinned(&cpu->timer, jiffies + delay);
}
static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
{
int32_t core_busy, max_pstate, current_pstate, sample_ratio;
s64 duration_us;
@ -960,30 +968,24 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
core_busy = mul_fp(core_busy, sample_ratio);
}
return core_busy;
cpu->sample.busy_scaled = core_busy;
return cpu->pstate.current_pstate - pid_calc(&cpu->pid, core_busy);
}
static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
{
int32_t busy_scaled;
struct _pid *pid;
signed int ctl;
int from;
int from, target_pstate;
struct sample *sample;
from = cpu->pstate.current_pstate;
pid = &cpu->pid;
busy_scaled = intel_pstate_get_scaled_busy(cpu);
target_pstate = pstate_funcs.get_target_pstate(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, true);
intel_pstate_set_pstate(cpu, target_pstate, true);
sample = &cpu->sample;
trace_pstate_sample(fp_toint(sample->core_pct_busy),
fp_toint(busy_scaled),
fp_toint(sample->busy_scaled),
from,
cpu->pstate.current_pstate,
sample->mperf,
@ -1237,6 +1239,8 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs)
pstate_funcs.get_scaling = funcs->get_scaling;
pstate_funcs.set = funcs->set;
pstate_funcs.get_vid = funcs->get_vid;
pstate_funcs.get_target_pstate = funcs->get_target_pstate;
}
#if IS_ENABLED(CONFIG_ACPI)