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Subject[PATCH 3/4] intel_pstate: delete scheduler hook in HWP mode
Date
From: Len Brown <len.brown@intel.com>

The cpufreq/scaling_cur_freq sysfs attribute is now provided by
shared x86 cpufreq code on modern x86 systems, including
all systems supported by the intel_pstate driver.

In HWP mode, maintaining that value was the sole purpose of
the scheduler hook, intel_pstate_update_util_hwp(),
so it can now be removed.

Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/cpufreq/intel_pstate.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index b7de5bd..4ec5668 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1732,16 +1732,6 @@ static void intel_pstate_adjust_pstate(struct cpudata *cpu, int target_pstate)
fp_toint(cpu->iowait_boost * 100));
}

-static void intel_pstate_update_util_hwp(struct update_util_data *data,
- u64 time, unsigned int flags)
-{
- struct cpudata *cpu = container_of(data, struct cpudata, update_util);
- u64 delta_ns = time - cpu->sample.time;
-
- if ((s64)delta_ns >= INTEL_PSTATE_HWP_SAMPLING_INTERVAL)
- intel_pstate_sample(cpu, time);
-}
-
static void intel_pstate_update_util_pid(struct update_util_data *data,
u64 time, unsigned int flags)
{
@@ -1933,6 +1923,9 @@ static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
{
struct cpudata *cpu = all_cpu_data[cpu_num];

+ if (hwp_active)
+ return;
+
if (cpu->update_util_set)
return;

@@ -2557,7 +2550,6 @@ static int __init intel_pstate_init(void)
} else {
hwp_active++;
intel_pstate.attr = hwp_cpufreq_attrs;
- pstate_funcs.update_util = intel_pstate_update_util_hwp;
goto hwp_cpu_matched;
}
} else {
--
2.7.4
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