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path: root/drivers/cpufreq/intel_pstate.c
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Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
-rw-r--r--drivers/cpufreq/intel_pstate.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index d6f323560da3..6cd503525638 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -225,6 +225,9 @@ struct global_params {
* @vid: Stores VID limits for this CPU
* @pid: Stores PID parameters 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
@@ -259,6 +262,7 @@ struct cpudata {
u64 last_update;
u64 last_sample_time;
+ u64 aperf_mperf_shift;
u64 prev_aperf;
u64 prev_mperf;
u64 prev_tsc;
@@ -321,6 +325,7 @@ struct pstate_funcs {
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 *);
void (*update_util)(struct update_util_data *data, u64 time,
@@ -572,7 +577,7 @@ static int min_perf_pct_min(void)
int turbo_pstate = cpu->pstate.turbo_pstate;
return turbo_pstate ?
- DIV_ROUND_UP(cpu->pstate.min_pstate * 100, turbo_pstate) : 0;
+ (cpu->pstate.min_pstate * 100 / turbo_pstate) : 0;
}
static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
@@ -1486,6 +1491,11 @@ static u64 core_get_val(struct cpudata *cpudata, int pstate)
return val;
}
+static int knl_get_aperf_mperf_shift(void)
+{
+ return 10;
+}
+
static int knl_get_turbo_pstate(void)
{
u64 value;
@@ -1543,6 +1553,9 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling;
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);
@@ -1616,7 +1629,8 @@ static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu)
int32_t busy_frac, boost;
int target, avg_pstate;
- busy_frac = div_fp(sample->mperf, sample->tsc);
+ busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift,
+ sample->tsc);
boost = cpu->iowait_boost;
cpu->iowait_boost >>= 1;
@@ -1675,7 +1689,8 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
sample_ratio = div_fp(pid_params.sample_rate_ns, duration_ns);
perf_scaled = mul_fp(perf_scaled, sample_ratio);
} else {
- sample_ratio = div_fp(100 * cpu->sample.mperf, cpu->sample.tsc);
+ sample_ratio = div_fp(100 * (cpu->sample.mperf << cpu->aperf_mperf_shift),
+ cpu->sample.tsc);
if (sample_ratio < int_tofp(1))
perf_scaled = 0;
}
@@ -1807,6 +1822,7 @@ static const struct pstate_funcs knl_funcs = {
.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,
.update_util = intel_pstate_update_util_pid,
@@ -2403,6 +2419,7 @@ static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
pstate_funcs.get_val = funcs->get_val;
pstate_funcs.get_vid = funcs->get_vid;
pstate_funcs.update_util = funcs->update_util;
+ pstate_funcs.get_aperf_mperf_shift = funcs->get_aperf_mperf_shift;
intel_pstate_use_acpi_profile();
}