arch/arm64/include/asm/smp_plat.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Definitions specific to SMP platforms.
   4  *
   5  * Copyright (C) 2013 ARM Ltd.
   6  */
   7
   8 #ifndef __ASM_SMP_PLAT_H
   9 #define __ASM_SMP_PLAT_H
  10
  11 #include <linux/cpumask.h>
  12
  13 #include <asm/types.h>
  14
  15 struct mpidr_hash {
  16         u64     mask;
  17         u32     shift_aff[4];
  18         u32     bits;
  19 };
  20
  21 extern struct mpidr_hash mpidr_hash;
  22
  23 static inline u32 mpidr_hash_size(void)
  24 {
  25         return 1 << mpidr_hash.bits;
  26 }
  27
  28 /*
  29  * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
  30  *  - mpidr: MPIDR.Aff* bits to be used for the look-up
  31  *
  32  * Returns the cpu logical index or -EINVAL on look-up error
  33  */
  34 static inline int get_logical_index(u64 mpidr)
  35 {
  36         int cpu;
  37         for (cpu = 0; cpu < nr_cpu_ids; cpu++)
  38                 if (cpu_logical_map(cpu) == mpidr)
  39                         return cpu;
  40         return -EINVAL;
  41 }
  42
  43 #endif /* __ASM_SMP_PLAT_H */