linux-kernel - [RFC/RFT] [PATCH v2 3/6] cpufreq: intel_pstate: Add update_util

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Date:   Wed, 23 May 2018 18:47:35 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     lenb@...nel.org, rjw@...ysocki.net, peterz@...radead.org,
        mgorman@...hsingularity.net
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        juri.lelli@...hat.com, viresh.kumar@...aro.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [RFC/RFT] [PATCH v2 3/6] cpufreq: intel_pstate: Add update_util_hook for HWP

When HWP dynamic boost is active then set the HWP specific update util
hook.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 drivers/cpufreq/intel_pstate.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 6ad46e07cad6..382160570b5f 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -291,6 +291,7 @@ static struct pstate_funcs pstate_funcs __read_mostly;
 
 static int hwp_active __read_mostly;
 static bool per_cpu_limits __read_mostly;
+static bool hwp_boost __read_mostly;
 
 static struct cpufreq_driver *intel_pstate_driver __read_mostly;
 
@@ -1461,6 +1462,11 @@ static inline bool intel_pstate_hwp_boost_down(struct cpudata *cpu)
 	return false;
 }
 
+static inline void intel_pstate_update_util_hwp(struct update_util_data *data,
+						u64 time, unsigned int flags)
+{
+}
+
 static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu)
 {
 	struct sample *sample = &cpu->sample;
@@ -1764,7 +1770,7 @@ static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
 {
 	struct cpudata *cpu = all_cpu_data[cpu_num];
 
-	if (hwp_active)
+	if (hwp_active && !hwp_boost)
 		return;
 
 	if (cpu->update_util_set)
@@ -1772,8 +1778,12 @@ static void intel_pstate_set_update_util_hook(unsigned int cpu_num)
 
 	/* Prevent intel_pstate_update_util() from using stale data. */
 	cpu->sample.time = 0;
-	cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
-				     intel_pstate_update_util);
+	if (hwp_active)
+		cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
+					     intel_pstate_update_util_hwp);
+	else
+		cpufreq_add_update_util_hook(cpu_num, &cpu->update_util,
+					     intel_pstate_update_util);
 	cpu->update_util_set = true;
 }
 
@@ -1885,8 +1895,11 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
 		intel_pstate_set_update_util_hook(policy->cpu);
 	}
 
-	if (hwp_active)
+	if (hwp_active) {
+		if (!hwp_boost)
+			intel_pstate_clear_update_util_hook(policy->cpu);
 		intel_pstate_hwp_set(policy->cpu);
+	}
 
 	mutex_unlock(&intel_pstate_limits_lock);
 
-- 
2.13.6