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arm64: smp_plat: add get_logical_index

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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: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2015-04-22 17:26:18 +01:00
parent 538b9b25fa
commit 6ee3c78cec
1 changed files with 16 additions and 0 deletions
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16
arch/arm64/include/asm/smp_plat.h
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@ -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);