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Commit 9f009d85 authored by Sultan Alsawaf's avatar Sultan Alsawaf Committed by Akshay Kakatkar
Browse files

cpumask: Add cpumasks for big and LITTLE CPU clusters 



Add cpu_lp_mask and cpu_perf_mask to represent the CPUs that belong to
each cluster in a dual-cluster, heterogeneous system.

Signed-off-by: default avatarSultan Alsawaf <sultan@kerneltoast.com>
[kdrag0n: Forward-ported to k4.19]
Signed-off-by: default avatarDanny Lin <danny@kdrag0n.dev>
parent cfeb0ee7

arch/arm64/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -786,6 +786,20 @@ config NR_CPUS 
	# These have to remain sorted largest to smallest

	default "64"



config LITTLE_CPU_MASK

	int "Bitmask of available LITTLE CPUs"

	help

	  This is a bitmask specifying which of the CPUs are LITTLE in a

	  heterogeneous system. Use 0 if you are unsure, which just results in

	  this storing the bitmask of all available CPUs.



config BIG_CPU_MASK

	int "Bitmask of available big CPUs"

	help

	  This is a bitmask specifying which of the CPUs are big in a

	  heterogeneous system. Use 0 if you are unsure, which just results in

	  this storing the bitmask of all available CPUs.



config HOTPLUG_CPU

	bool "Support for hot-pluggable CPUs"

	select GENERIC_IRQ_MIGRATION

include/linux/cpumask.h

+6 −0
Original line number Diff line number Diff line
@@ -55,6 +55,8 @@ extern unsigned int nr_cpu_ids; 
 *     cpu_online_mask  - has bit 'cpu' set iff cpu available to scheduler

 *     cpu_active_mask  - has bit 'cpu' set iff cpu available to migration

 *     cpu_isolated_mask- has bit 'cpu' set iff cpu isolated

 *     cpu_lp_mask      - has bit 'cpu' set iff cpu is part of little cluster

 *     cpu_perf_mask    - has bit 'cpu' set iff cpu is part of big cluster

 *

 *  If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.

 *
@@ -92,11 +94,15 @@ extern struct cpumask __cpu_online_mask; 
extern struct cpumask __cpu_present_mask;

extern struct cpumask __cpu_active_mask;

extern struct cpumask __cpu_isolated_mask;

extern struct cpumask __cpu_lp_mask;

extern struct cpumask __cpu_perf_mask;

#define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)

#define cpu_online_mask   ((const struct cpumask *)&__cpu_online_mask)

#define cpu_present_mask  ((const struct cpumask *)&__cpu_present_mask)

#define cpu_active_mask   ((const struct cpumask *)&__cpu_active_mask)

#define cpu_isolated_mask ((const struct cpumask *)&__cpu_isolated_mask)

extern const struct cpumask *const cpu_lp_mask;

extern const struct cpumask *const cpu_perf_mask;



#if NR_CPUS > 1

#define num_online_cpus()	cpumask_weight(cpu_online_mask)

kernel/cpu.c

+16 −0
Original line number Diff line number Diff line
@@ -2330,6 +2330,22 @@ EXPORT_SYMBOL(__cpu_active_mask); 
struct cpumask __cpu_isolated_mask __read_mostly;

EXPORT_SYMBOL(__cpu_isolated_mask);



#if CONFIG_LITTLE_CPU_MASK

static const unsigned long lp_cpu_bits = CONFIG_LITTLE_CPU_MASK;

const struct cpumask *const cpu_lp_mask = to_cpumask(&lp_cpu_bits);

#else

const struct cpumask *const cpu_lp_mask = cpu_possible_mask;

#endif

EXPORT_SYMBOL(cpu_lp_mask);



#if CONFIG_BIG_CPU_MASK

static const unsigned long perf_cpu_bits = CONFIG_BIG_CPU_MASK;

const struct cpumask *const cpu_perf_mask = to_cpumask(&perf_cpu_bits);

#else

const struct cpumask *const cpu_perf_mask = cpu_possible_mask;

#endif

EXPORT_SYMBOL(cpu_perf_mask);



void init_cpu_present(const struct cpumask *src)

{

	cpumask_copy(&__cpu_present_mask, src);