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Commit 3a8a28a7 authored by Danny Lin's avatar Danny Lin Committed by Akshay Kakatkar
Browse files

cpumask: Add cpumask for the Prime CPU cluster 



Newer Qualcomm SoCs, such as sm8150, have a Prime cluster with one CPU
core that performs better than even the big cluster.

Signed-off-by: default avatarDanny Lin <danny@kdrag0n.dev>
parent 9f009d85

arch/arm64/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -800,6 +800,13 @@ config BIG_CPU_MASK 
	  heterogeneous system. Use 0 if you are unsure, which just results in

	  this storing the bitmask of all available CPUs.



config PRIME_CPU_MASK

	int "Bitmask of available prime CPUs"

	help

	  This is a bitmask specifying which of the CPUs are prime 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

+2 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ extern unsigned int nr_cpu_ids; 
 *     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

 *     cpu_perfp_mask   - has bit 'cpu' set iff cpu is part of prime cluster

 *

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

 *
@@ -103,6 +104,7 @@ extern struct cpumask __cpu_perf_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;

extern const struct cpumask *const cpu_perfp_mask;



#if NR_CPUS > 1

#define num_online_cpus()	cpumask_weight(cpu_online_mask)

kernel/cpu.c

+8 −0
Original line number Diff line number Diff line
@@ -2346,6 +2346,14 @@ const struct cpumask *const cpu_perf_mask = cpu_possible_mask; 
#endif

EXPORT_SYMBOL(cpu_perf_mask);



#if CONFIG_PRIME_CPU_MASK

static const unsigned long perfp_cpu_bits = CONFIG_PRIME_CPU_MASK;

const struct cpumask *const cpu_perfp_mask = to_cpumask(&perfp_cpu_bits);

#else

const struct cpumask *const cpu_perfp_mask = cpu_possible_mask;

#endif

EXPORT_SYMBOL(cpu_perfp_mask);



void init_cpu_present(const struct cpumask *src)

{

	cpumask_copy(&__cpu_present_mask, src);