arch/arm64/include/asm/smp_plat.h

   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
  26 struct mpidr_hash {
  27         u64     mask;
  28         u32     shift_aff[4];
  29         u32     bits;
  30 };
  31
  32 extern struct mpidr_hash mpidr_hash;
  33
  34 static inline u32 mpidr_hash_size(void)
  35 {
  36         return 1 << mpidr_hash.bits;
  37 }
  38
  39 /*
  40  * Logical CPU mapping.
  41  */
  42 extern 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  */
  50 static 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 */