sched: Add snapshot of core_ctl

This snapshot is taken from msm-4.14 as of commit 3206cd0e936a9f1
("sched: core_ctl: Add core_ctl_notifier_register()").

Change-Id: Icc082b55d620739e0e6be1c24e7506221cd5cfd9
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>

include/linux/cpuhotplug.h

@@ -69,6 +69,7 @@ enum cpuhp_state {
 	CPUHP_SLAB_PREPARE,
 	CPUHP_MD_RAID5_PREPARE,
 	CPUHP_RCUTREE_PREP,
+	CPUHP_CORE_CTL_ISOLATION_DEAD,
 	CPUHP_CPUIDLE_COUPLED_PREPARE,
 	CPUHP_POWERPC_PMAC_PREPARE,
 	CPUHP_POWERPC_MMU_CTX_PREPARE,

include/trace/events/sched.h

@@ -951,6 +951,96 @@ TRACE_EVENT(sched_boost_cpu,
 		__entry->margin)
 );
 
+TRACE_EVENT(core_ctl_eval_need,
+
+	TP_PROTO(unsigned int cpu, unsigned int old_need,
+		unsigned int new_need, unsigned int updated),
+	TP_ARGS(cpu, old_need, new_need, updated),
+	TP_STRUCT__entry(
+		__field(u32, cpu)
+		__field(u32, old_need)
+		__field(u32, new_need)
+		__field(u32, updated)
+	),
+	TP_fast_assign(
+		__entry->cpu = cpu;
+		__entry->old_need = old_need;
+		__entry->new_need = new_need;
+		__entry->updated = updated;
+	),
+	TP_printk("cpu=%u, old_need=%u, new_need=%u, updated=%u", __entry->cpu,
+			__entry->old_need, __entry->new_need, __entry->updated)
+);
+
+TRACE_EVENT(core_ctl_set_busy,
+
+	TP_PROTO(unsigned int cpu, unsigned int busy,
+		unsigned int old_is_busy, unsigned int is_busy),
+	TP_ARGS(cpu, busy, old_is_busy, is_busy),
+	TP_STRUCT__entry(
+		__field(u32, cpu)
+		__field(u32, busy)
+		__field(u32, old_is_busy)
+		__field(u32, is_busy)
+		__field(bool, high_irqload)
+	),
+	TP_fast_assign(
+		__entry->cpu = cpu;
+		__entry->busy = busy;
+		__entry->old_is_busy = old_is_busy;
+		__entry->is_busy = is_busy;
+		__entry->high_irqload = sched_cpu_high_irqload(cpu);
+	),
+	TP_printk("cpu=%u, busy=%u, old_is_busy=%u, new_is_busy=%u high_irqload=%d",
+		__entry->cpu, __entry->busy, __entry->old_is_busy,
+		__entry->is_busy, __entry->high_irqload)
+);
+
+TRACE_EVENT(core_ctl_set_boost,
+
+	TP_PROTO(u32 refcount, s32 ret),
+	TP_ARGS(refcount, ret),
+	TP_STRUCT__entry(
+		__field(u32, refcount)
+		__field(s32, ret)
+	),
+	TP_fast_assign(
+		__entry->refcount = refcount;
+		__entry->ret = ret;
+	),
+	TP_printk("refcount=%u, ret=%d", __entry->refcount, __entry->ret)
+);
+
+TRACE_EVENT(core_ctl_update_nr_need,
+
+	TP_PROTO(int cpu, int nr_need, int prev_misfit_need,
+		int nrrun, int max_nr, int nr_prev_assist),
+
+	TP_ARGS(cpu, nr_need, prev_misfit_need, nrrun, max_nr, nr_prev_assist),
+
+	TP_STRUCT__entry(
+		__field(int, cpu)
+		__field(int, nr_need)
+		__field(int, prev_misfit_need)
+		__field(int, nrrun)
+		__field(int, max_nr)
+		__field(int, nr_prev_assist)
+	),
+
+	TP_fast_assign(
+		__entry->cpu = cpu;
+		__entry->nr_need = nr_need;
+		__entry->prev_misfit_need = prev_misfit_need;
+		__entry->nrrun = nrrun;
+		__entry->max_nr = max_nr;
+		__entry->nr_prev_assist = nr_prev_assist;
+	),
+
+	TP_printk("cpu=%d nr_need=%d prev_misfit_need=%d nrrun=%d max_nr=%d nr_prev_assist=%d",
+		__entry->cpu, __entry->nr_need, __entry->prev_misfit_need,
+		__entry->nrrun, __entry->max_nr, __entry->nr_prev_assist)
+);
+
 /*
  * Tracepoint for schedtune_tasks_update
  */

init/Kconfig

@@ -932,6 +932,16 @@ config SOCK_CGROUP_DATA
 
 endif # CGROUPS
 
+config SCHED_CORE_CTL
+	bool "QTI Core Control"
+	depends on SMP
+	help
+	  This options enables the core control functionality in
+	  the scheduler. Core control automatically offline and
+	  online cores based on cpu load and utilization.
+
+	  If unsure, say N here.
+
 menuconfig NAMESPACES
 	bool "Namespaces support" if EXPERT
 	depends on MULTIUSER

kernel/sched/Makefile

@@ -30,3 +30,4 @@ obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
 obj-$(CONFIG_MEMBARRIER) += membarrier.o
 obj-$(CONFIG_CPU_ISOLATION) += isolation.o
+obj-$(CONFIG_SCHED_CORE_CTL) += core_ctl.o

kernel/sched/core.c

@@ -20,6 +20,7 @@
 
 #include "pelt.h"
 #include "walt.h"
+#include "core_ctl.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/sched.h>
@@ -3178,6 +3179,8 @@ void scheduler_tick(void)
 
 	if (curr->sched_class == &fair_sched_class)
 		check_for_migration(rq, curr);
+
+	core_ctl_check(wallclock);
 }
 
 #ifdef CONFIG_NO_HZ_FULL

kernel/sched/core_ctl.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __CORE_CTL_H
+#define __CORE_CTL_H
+
+#ifdef CONFIG_SCHED_CORE_CTL
+void core_ctl_check(u64 wallclock);
+int core_ctl_set_boost(bool boost);
+#else
+static inline void core_ctl_check(u64 wallclock) {}
+static inline int core_ctl_set_boost(bool boost)
+{
+	return 0;
+}
+#endif
+#endif