Merge tag 'mvebu-dt-3.15' of git://git.infradead.org/linux-mvebu into next/dt

[cascardo/linux.git] / drivers / cpufreq / intel_pstate.c

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 7e257b2..c788abf 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -51,12 +51,11 @@ static inline int32_t div_fp(int32_t x, int32_t y)
        return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
 }
 
-static u64 energy_divisor;
-
 struct sample {
        int32_t core_pct_busy;
        u64 aperf;
        u64 mperf;
+       unsigned long long tsc;
        int freq;
 };
 
@@ -96,6 +95,7 @@ struct cpudata {
 
        u64     prev_aperf;
        u64     prev_mperf;
+       unsigned long long prev_tsc;
        int     sample_ptr;
        struct sample samples[SAMPLE_COUNT];
 };
@@ -548,30 +548,41 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu,
                                        struct sample *sample)
 {
        u64 core_pct;
-       core_pct = div64_u64(int_tofp(sample->aperf * 100),
-                            sample->mperf);
-       sample->freq = fp_toint(cpu->pstate.max_pstate * core_pct * 1000);
+       u64 c0_pct;
+
+       core_pct = div64_u64(sample->aperf * 100, sample->mperf);
 
-       sample->core_pct_busy = core_pct;
+       c0_pct = div64_u64(sample->mperf * 100, sample->tsc);
+       sample->freq = fp_toint(
+               mul_fp(int_tofp(cpu->pstate.max_pstate),
+                       int_tofp(core_pct * 1000)));
+
+       sample->core_pct_busy = mul_fp(int_tofp(core_pct),
+                               div_fp(int_tofp(c0_pct + 1), int_tofp(100)));
 }
 
 static inline void intel_pstate_sample(struct cpudata *cpu)
 {
        u64 aperf, mperf;
+       unsigned long long tsc;
 
        rdmsrl(MSR_IA32_APERF, aperf);
        rdmsrl(MSR_IA32_MPERF, mperf);
+       tsc = native_read_tsc();
 
        cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
        cpu->samples[cpu->sample_ptr].aperf = aperf;
        cpu->samples[cpu->sample_ptr].mperf = mperf;
+       cpu->samples[cpu->sample_ptr].tsc = tsc;
        cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;
        cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
+       cpu->samples[cpu->sample_ptr].tsc -= cpu->prev_tsc;
 
        intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
 
        cpu->prev_aperf = aperf;
        cpu->prev_mperf = mperf;
+       cpu->prev_tsc = tsc;
 }
 
 static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
@@ -617,12 +628,10 @@ static void intel_pstate_timer_func(unsigned long __data)
 {
        struct cpudata *cpu = (struct cpudata *) __data;
        struct sample *sample;
-       u64 energy;
 
        intel_pstate_sample(cpu);
 
        sample = &cpu->samples[cpu->sample_ptr];
-       rdmsrl(MSR_PKG_ENERGY_STATUS, energy);
 
        intel_pstate_adjust_busy_pstate(cpu);
 
@@ -631,7 +640,6 @@ static void intel_pstate_timer_func(unsigned long __data)
                        cpu->pstate.current_pstate,
                        sample->mperf,
                        sample->aperf,
-                       div64_u64(energy, energy_divisor),
                        sample->freq);
 
        intel_pstate_set_sample_time(cpu);
@@ -913,7 +921,6 @@ static int __init intel_pstate_init(void)
        int cpu, rc = 0;
        const struct x86_cpu_id *id;
        struct cpu_defaults *cpu_info;
-       u64 units;
 
        if (no_load)
                return -ENODEV;
@@ -947,9 +954,6 @@ static int __init intel_pstate_init(void)
        if (rc)
                goto out;
 
-       rdmsrl(MSR_RAPL_POWER_UNIT, units);
-       energy_divisor = 1 << ((units >> 8) & 0x1f); /* bits{12:8} */
-
        intel_pstate_debug_expose_params();
        intel_pstate_sysfs_expose_params();