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Commit 6ee3c78c authored by Mark Rutland's avatar Mark Rutland
Browse files

arm64: smp_plat: add get_logical_index 



The PSCI MIGRATE_INFO_UP_CPU call returns a physical ID, which we will
need to map back to a Linux logical ID.

Implement a reusable get_logical_index to map from a physical ID to a
logical ID.

Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Tested-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
parent 538b9b25

arch/arm64/include/asm/smp_plat.h

+16 −0
Original line number Diff line number Diff line
@@ -19,6 +19,8 @@ 
#ifndef __ASM_SMP_PLAT_H

#define __ASM_SMP_PLAT_H



#include <linux/cpumask.h>



#include <asm/types.h>



struct mpidr_hash {
@@ -39,6 +41,20 @@ static inline u32 mpidr_hash_size(void) 
 */

extern u64 __cpu_logical_map[NR_CPUS];

#define cpu_logical_map(cpu)    __cpu_logical_map[cpu]

/*

 * Retrieve logical cpu index corresponding to a given MPIDR.Aff*

 *  - mpidr: MPIDR.Aff* bits to be used for the look-up

 *

 * Returns the cpu logical index or -EINVAL on look-up error

 */

static inline int get_logical_index(u64 mpidr)

{

	int cpu;

	for (cpu = 0; cpu < nr_cpu_ids; cpu++)

		if (cpu_logical_map(cpu) == mpidr)

			return cpu;

	return -EINVAL;

}



void __init do_post_cpus_up_work(void);