Commit 6d45b719 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

intel_pstate: Fix intel_pstate_get()

After commit 8fa520af "intel_pstate: Remove freq calculation from
intel_pstate_calc_busy()" intel_pstate_get() calls get_avg_frequency()
to compute the average frequency, which is problematic for two reasons.

First, intel_pstate_get() may be invoked before the driver reads the
CPU feedback registers for the first time and if that happens,
get_avg_frequency() will attempt to divide by zero.

Second, the get_avg_frequency() call in intel_pstate_get() is racy
with respect to intel_pstate_sample() and it may end up returning
completely meaningless values for this reason.

Moreover, after commit 7349ec04 "intel_pstate: Move
intel_pstate_calc_busy() into get_target_pstate_use_performance()"
sample.core_pct_busy is never computed on Atom, but it is used in
intel_pstate_adjust_busy_pstate() in that case too.

To address those problems notice that if sample.core_pct_busy
was used in the average frequency computation carried out by
get_avg_frequency(), both the divide by zero problem and the
race with respect to intel_pstate_sample() would be avoided.

Accordingly, move the invocation of intel_pstate_calc_busy() from
get_target_pstate_use_performance() to intel_pstate_update_util(),
which also will take care of the uninitialized sample.core_pct_busy
on Atom, and modify get_avg_frequency() to use sample.core_pct_busy
as per the above.
Reported-by: default avatarkernel test robot <ying.huang@linux.intel.com>
Link: http://marc.info/?l=linux-kernel&m=146226437623173&w=4
Fixes: 8fa520af "intel_pstate: Remove freq calculation from intel_pstate_calc_busy()"
Fixes: 7349ec04 "intel_pstate: Move intel_pstate_calc_busy() into get_target_pstate_use_performance()"
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ba41e1bc
...@@ -1070,8 +1070,9 @@ static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) ...@@ -1070,8 +1070,9 @@ static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time)
static inline int32_t get_avg_frequency(struct cpudata *cpu) static inline int32_t get_avg_frequency(struct cpudata *cpu)
{ {
return div64_u64(cpu->pstate.max_pstate_physical * cpu->sample.aperf * return fp_toint(mul_fp(cpu->sample.core_pct_busy,
cpu->pstate.scaling, cpu->sample.mperf); int_tofp(cpu->pstate.max_pstate_physical *
cpu->pstate.scaling / 100)));
} }
static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu)
...@@ -1114,8 +1115,6 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) ...@@ -1114,8 +1115,6 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
int32_t core_busy, max_pstate, current_pstate, sample_ratio; int32_t core_busy, max_pstate, current_pstate, sample_ratio;
u64 duration_ns; u64 duration_ns;
intel_pstate_calc_busy(cpu);
/* /*
* core_busy is the ratio of actual performance to max * core_busy is the ratio of actual performance to max
* max_pstate is the max non turbo pstate available * max_pstate is the max non turbo pstate available
...@@ -1199,8 +1198,11 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time, ...@@ -1199,8 +1198,11 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time,
if ((s64)delta_ns >= pid_params.sample_rate_ns) { if ((s64)delta_ns >= pid_params.sample_rate_ns) {
bool sample_taken = intel_pstate_sample(cpu, time); bool sample_taken = intel_pstate_sample(cpu, time);
if (sample_taken && !hwp_active) if (sample_taken) {
intel_pstate_adjust_busy_pstate(cpu); intel_pstate_calc_busy(cpu);
if (!hwp_active)
intel_pstate_adjust_busy_pstate(cpu);
}
} }
} }
......
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