intel_pstate: Change busy calculation to use fixed point math.

Commit fcb6a15c2e (intel_pstate: Take core C0 time into account for
core busy calculation) introduced a regression on some processor SKUs
supported by intel_pstate. This was due to the truncation caused by
using integer math to calculate core busy and C0 percentages.

On a i7-4770K processor operating at 800Mhz going to 100% utilization
the percent busy of the CPU using integer math is 22%, but it actually
is 22.85%.  This value scaled to the current frequency returned 97
which the PID interpreted as no error and did not adjust the P state.

Tested on i7-4770K, i7-2600, i5-3230M.

Fixes: fcb6a15c2e7e (intel_pstate: Take core C0 time into account for core busy calculation)
References: https://lkml.org/lkml/2014/2/19/626
References: https://bugzilla.kernel.org/show_bug.cgi?id=70941
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index e908161059216b286123948d3de3405da450d3b8..2cd36b9297f3de01a4b5f2ed246d738e123d7991 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -39,9 +39,10 @@
 #define BYT_TURBO_RATIOS       0x66c
 
 
-#define FRAC_BITS 8
+#define FRAC_BITS 6
 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
 #define fp_toint(X) ((X) >> FRAC_BITS)
+#define FP_ROUNDUP(X) ((X) += 1 << FRAC_BITS)
 
 static inline int32_t mul_fp(int32_t x, int32_t y)
 {
@@ -556,18 +557,20 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
 static inline void intel_pstate_calc_busy(struct cpudata *cpu,
                                        struct sample *sample)
 {
-       u64 core_pct;
-       u64 c0_pct;
+       int32_t core_pct;
+       int32_t c0_pct;
 
-       core_pct = div64_u64(sample->aperf * 100, sample->mperf);
+       core_pct = div_fp(int_tofp((sample->aperf)),
+                       int_tofp((sample->mperf)));
+       core_pct = mul_fp(core_pct, int_tofp(100));
+       FP_ROUNDUP(core_pct);
+
+       c0_pct = div_fp(int_tofp(sample->mperf), int_tofp(sample->tsc));
 
-       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)));
+               mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));
 
-       sample->core_pct_busy = mul_fp(int_tofp(core_pct),
-                               div_fp(int_tofp(c0_pct + 1), int_tofp(100)));
+       sample->core_pct_busy = mul_fp(core_pct, c0_pct);
 }
 
 static inline void intel_pstate_sample(struct cpudata *cpu)
@@ -579,6 +582,10 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
        rdmsrl(MSR_IA32_MPERF, mperf);
        tsc = native_read_tsc();
 
+       aperf = aperf >> FRAC_BITS;
+       mperf = mperf >> FRAC_BITS;
+       tsc = tsc >> FRAC_BITS;
+
        cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
        cpu->samples[cpu->sample_ptr].aperf = aperf;
        cpu->samples[cpu->sample_ptr].mperf = mperf;
@@ -610,7 +617,8 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
        core_busy = cpu->samples[cpu->sample_ptr].core_pct_busy;
        max_pstate = int_tofp(cpu->pstate.max_pstate);
        current_pstate = int_tofp(cpu->pstate.current_pstate);
-       return mul_fp(core_busy, div_fp(max_pstate, current_pstate));
+       core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
+       return FP_ROUNDUP(core_busy);
 }
 
 static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)