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/smp.h>
  14 #include <asm/types.h>
  15
  16 struct mpidr_hash {
  17         u64     mask;
  18         u32     shift_aff[4];
  19         u32     bits;
  20 };
  21
  22 extern struct mpidr_hash mpidr_hash;
  23
  24 static inline u32 mpidr_hash_size(void)
  25 {
  26         return 1 << mpidr_hash.bits;
  27 }
  28
  29 /*
  30  * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
  31  *  - mpidr: MPIDR.Aff* bits to be used for the look-up
  32  *
  33  * Returns the cpu logical index or -EINVAL on look-up error
  34  */
  35 static inline int get_logical_index(u64 mpidr)
  36 {
  37         int cpu;
  38         for (cpu = 0; cpu < nr_cpu_ids; cpu++)
  39                 if (cpu_logical_map(cpu) == mpidr)
  40                         return cpu;
  41         return -EINVAL;
  42 }
  43
  44 #endif /* __ASM_SMP_PLAT_H */