cpufreq: schedutilX: Introduce initial bringup

Import from linux 4.9 android-common plus additional changes

hardcode up and down rates

arch/arm64/configs/exynos9810_defconfig

@@ -696,6 +696,7 @@ CONFIG_CPU_FREQ_STAT=y
 # CONFIG_CPU_FREQ_DEFAULT_GOV_SCHED is not set
 # CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE is not set
 CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y
+# CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTILX is not set
 CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
 CONFIG_CPU_FREQ_GOV_POWERSAVE=y
 # CONFIG_CPU_FREQ_GOV_USERSPACE is not set
@@ -704,6 +705,7 @@ CONFIG_CPU_FREQ_GOV_POWERSAVE=y
 # CONFIG_CPU_FREQ_GOV_SCHED is not set
 # CONFIG_CPU_FREQ_GOV_INTERACTIVE is not set
 CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y
+CONFIG_CPU_FREQ_GOV_SCHEDUTILX=y
 CONFIG_FREQVAR_TUNE=y
 
 #

drivers/cpufreq/Kconfig

@@ -128,6 +128,16 @@ config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
 	  have a look at the help section of that governor. The fallback
 	  governor will be 'performance'.
 
+
+config CPU_FREQ_DEFAULT_GOV_SCHEDUTILX
+	bool "schedutilX"
+	depends on SMP
+	select CPU_FREQ_GOV_SCHEDUTILX
+	help
+	  Use the 'schedutilX' CPUFreq governor by default. If unsure,
+	  have a look at the help section of that governor. The fallback
+	  governor will be 'performance'.
+
 endchoice
 
 config CPU_FREQ_GOV_PERFORMANCE
@@ -259,6 +269,23 @@ config CPU_FREQ_GOV_SCHEDUTIL
 
 	  If in doubt, say N.
 
+config CPU_FREQ_GOV_SCHEDUTILX
+	bool "'schedutilX' cpufreq policy governor"
+	depends on CPU_FREQ && SMP
+	select CPU_FREQ_GOV_ATTR_SET
+	select IRQ_WORK
+	help
+	  This governor makes decisions based on the utilization data provided
+	  by the scheduler.  It sets the CPU frequency to be proportional to
+	  the utilization/capacity ratio coming from the scheduler.  If the
+	  utilization is frequency-invariant, the new frequency is also
+	  proportional to the maximum available frequency.  If that is not the
+	  case, it is proportional to the current frequency of the CPU.  The
+	  frequency tipping point is at utilization/capacity equal to 80% in
+	  both cases.
+
+	  If in doubt, say N.
+
 config FREQVAR_TUNE
 	bool "CPU frequency variant tuner"
 	depends on SCHED_EMS && CPU_FREQ_GOV_SCHEDUTIL

kernel/sched/Makefile

@@ -27,6 +27,6 @@ obj-$(CONFIG_SCHED_TUNE) += tune.o
 obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
 obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
+obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTILX) += cpufreq_schedutilX.o
 obj-$(CONFIG_PSI) += psi.o
 obj-$(CONFIG_SCHED_EMS) += ems/
-