Merge "ARM: dts: msm: disable core_ctl for SDM630" (0a6a4c21) · Commits · e / devices / android_kernel_sony_msm8998

Documentation/kernel-parameters.txt

+6 −0

Original line number	Diff line number	Diff line
		@@ -750,6 +750,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
		seconds. Defaults to 10*60 = 10mins. A value of 0
		disables the blank timer.

		core_ctl_disable_cpumask= [SMP]
		Exempt the CPUs from being managed by core_ctl.
		core_ctl operates on a cluster basis. So all the
		CPUs in a given cluster must be specified to disable
		core_ctl for that cluster.

		coredump_filter=
		[KNL] Change the default value for
		/proc/<pid>/coredump_filter.

arch/arm/boot/dts/qcom/sdm630.dtsi

+1 −1

Original line number	Diff line number	Diff line
		@@ -34,7 +34,7 @@

		chosen {
		stdout-path = "serial0";
		bootargs = "rcupdate.rcu_expedited=1";
		bootargs = "rcupdate.rcu_expedited=1 core_ctl_disable_cpumask=0-7";
		};

		psci {

kernel/sched/core_ctl.c

+45 −0

Original line number	Diff line number	Diff line
		@@ -653,6 +653,9 @@ int core_ctl_set_boost(bool boost)
		int ret = 0;
		bool boost_state_changed = false;

		if (unlikely(!initialized))
		return 0;

		spin_lock_irqsave(&state_lock, flags);
		for_each_cluster(cluster, index) {
		if (cluster->is_big_cluster) {
		@@ -931,6 +934,42 @@ static struct notifier_block __refdata cpu_notifier = {

		/* ============================ init code ============================== */

		static cpumask_var_t core_ctl_disable_cpumask;
		static bool core_ctl_disable_cpumask_present;

		static int __init core_ctl_disable_setup(char *str)
		{
		if (!*str)
		return -EINVAL;

		alloc_bootmem_cpumask_var(&core_ctl_disable_cpumask);

		if (cpulist_parse(str, core_ctl_disable_cpumask) < 0) {
		free_bootmem_cpumask_var(core_ctl_disable_cpumask);
		return -EINVAL;
		}

		core_ctl_disable_cpumask_present = true;
		pr_info("disable_cpumask=%*pbl\n",
		cpumask_pr_args(core_ctl_disable_cpumask));

		return 0;
		}
		early_param("core_ctl_disable_cpumask", core_ctl_disable_setup);

		static bool should_skip(const struct cpumask *mask)
		{
		if (!core_ctl_disable_cpumask_present)
		return false;

		/*
		* We operate on a cluster basis. Disable the core_ctl for
		* a cluster, if all of it's cpus are specified in
		* core_ctl_disable_cpumask
		*/
		return cpumask_subset(mask, core_ctl_disable_cpumask);
		}

		static struct cluster_data *find_cluster_by_first_cpu(unsigned int first_cpu)
		{
		unsigned int i;
		@@ -952,6 +991,9 @@ static int cluster_init(const struct cpumask *mask)
		unsigned int cpu;
		struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };

		if (should_skip(mask))
		return 0;

		if (find_cluster_by_first_cpu(first_cpu))
		return 0;

		@@ -1052,6 +1094,9 @@ static int __init core_ctl_init(void)
		{
		unsigned int cpu;

		if (should_skip(cpu_possible_mask))
		return 0;

		core_ctl_check_interval = (rq_avg_period_ms - RQ_AVG_TOLERANCE)
		* NSEC_PER_MSEC;