LXR linux/arch/arm64/include/asm/smp

   1/*
   2 * Definitions specific to SMP platforms.
   3 *
   4 * Copyright (C) 2013 ARM Ltd.
   5 *
   6 * This program is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#ifndef __ASM_SMP_PLAT_H
  20#define __ASM_SMP_PLAT_H
  21
  22#include <linux/cpumask.h>
  23
  24#include <asm/types.h>
  25
  26struct mpidr_hash {
  27        u64     mask;
  28        u32     shift_aff[4];
  29        u32     bits;
  30};
  31
  32extern struct mpidr_hash mpidr_hash;
  33
  34static inline u32 mpidr_hash_size(void)
  35{
  36        return 1 << mpidr_hash.bits;
  37}
  38
  39/*
  40 * Logical CPU mapping.
  41 */
  42extern u64 __cpu_logical_map[NR_CPUS];
  43#define cpu_logical_map(cpu)    __cpu_logical_map[cpu]
  44/*
  45 * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
  46 *  - mpidr: MPIDR.Aff* bits to be used for the look-up
  47 *
  48 * Returns the cpu logical index or -EINVAL on look-up error
  49 */
  50static inline int get_logical_index(u64 mpidr)
  51{
  52        int cpu;
  53        for (cpu = 0; cpu < nr_cpu_ids; cpu++)
  54                if (cpu_logical_map(cpu) == mpidr)
  55                        return cpu;
  56        return -EINVAL;
  57}
  58
  59#endif /* __ASM_SMP_PLAT_H */
  60