cpufreq / intel_pstate: remove idle time and duration from sample and calculations

Idle time is taken into account in the APERF/MPERF ratio calculation
there is no reason for the driver to track it seperately.  This
reduces the work in the driver and makes the code more readable.

Removal of the tracking of sample duration removes the possibility of
the divide by zero exception when the duration is sub 1us

References: https://bugzilla.kernel.org/show_bug.cgi?id=56691
Reported-by: Mike Lothian <mike@fireburn.co.uk>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 8 insertions, 37 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index cc3a8e6c92be..c6e10d02b795 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -48,12 +48,7 @@ static inline int32_t div_fp(int32_t x, int32_t y)
 }
 
 struct sample {
-        ktime_t start_time;
-        ktime_t end_time;
         int core_pct_busy;
-        int pstate_pct_busy;
-        u64 duration_us;
-        u64 idletime_us;
         u64 aperf;
         u64 mperf;
         int freq;
@@ -91,8 +86,6 @@ struct cpudata {
         int min_pstate_count;
         int idle_mode;
 
-        ktime_t prev_sample;
-        u64     prev_idle_time_us;
         u64     prev_aperf;
         u64     prev_mperf;
         int     sample_ptr;
@@ -450,48 +443,26 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu,
                                         struct sample *sample)
 {
         u64 core_pct;
-        sample->pstate_pct_busy = 100 - div64_u64(
-                                        sample->idletime_us * 100,
-                                        sample->duration_us);
         core_pct = div64_u64(sample->aperf * 100, sample->mperf);
         sample->freq = cpu->pstate.max_pstate * core_pct * 1000;
 
-        sample->core_pct_busy = div_s64((sample->pstate_pct_busy * core_pct),
-                                        100);
+        sample->core_pct_busy = core_pct;
 }
 
 static inline void intel_pstate_sample(struct cpudata *cpu)
 {
-        ktime_t now;
-        u64 idle_time_us;
         u64 aperf, mperf;
 
-        now = ktime_get();
-        idle_time_us = get_cpu_idle_time_us(cpu->cpu, NULL);
-
         rdmsrl(MSR_IA32_APERF, aperf);
         rdmsrl(MSR_IA32_MPERF, mperf);
-        /* for the first sample, don't actually record a sample, just
-         * set the baseline */
-        if (cpu->prev_idle_time_us > 0) {
-                cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
-                cpu->samples[cpu->sample_ptr].start_time = cpu->prev_sample;
-                cpu->samples[cpu->sample_ptr].end_time = now;
-                cpu->samples[cpu->sample_ptr].duration_us =
-                        ktime_us_delta(now, cpu->prev_sample);
-                cpu->samples[cpu->sample_ptr].idletime_us =
-                        idle_time_us - cpu->prev_idle_time_us;
-
-                cpu->samples[cpu->sample_ptr].aperf = aperf;
-                cpu->samples[cpu->sample_ptr].mperf = mperf;
-                cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;
-                cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
-
-                intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
-        }
+        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].aperf -= cpu->prev_aperf;
+        cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
+
+        intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
 
-        cpu->prev_sample = now;
-        cpu->prev_idle_time_us = idle_time_us;
         cpu->prev_aperf = aperf;
         cpu->prev_mperf = mperf;
 }