arch/riscv/include/asm/smp.h

   1 /*
   2  * Copyright (C) 2012 Regents of the University of California
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #ifndef _ASM_RISCV_SMP_H
  15 #define _ASM_RISCV_SMP_H
  16
  17 #include <linux/cpumask.h>
  18 #include <linux/irqreturn.h>
  19 #include <linux/thread_info.h>
  20
  21 #define INVALID_HARTID ULONG_MAX
  22
  23 struct seq_file;
  24 extern unsigned long boot_cpu_hartid;
  25
  26 #ifdef CONFIG_SMP
  27 /*
  28  * Mapping between linux logical cpu index and hartid.
  29  */
  30 extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
  31 #define cpuid_to_hartid_map(cpu)    __cpuid_to_hartid_map[cpu]
  32
  33 /* print IPI stats */
  34 void show_ipi_stats(struct seq_file *p, int prec);
  35
  36 /* SMP initialization hook for setup_arch */
  37 void __init setup_smp(void);
  38
  39 /* Hook for the generic smp_call_function_many() routine. */
  40 void arch_send_call_function_ipi_mask(struct cpumask *mask);
  41
  42 /* Hook for the generic smp_call_function_single() routine. */
  43 void arch_send_call_function_single_ipi(int cpu);
  44
  45 int riscv_hartid_to_cpuid(int hartid);
  46 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
  47
  48 /*
  49  * Obtains the hart ID of the currently executing task.  This relies on
  50  * THREAD_INFO_IN_TASK, but we define that unconditionally.
  51  */
  52 #define raw_smp_processor_id() (current_thread_info()->cpu)
  53
  54 #else
  55
  56 static inline void show_ipi_stats(struct seq_file *p, int prec)
  57 {
  58 }
  59
  60 static inline int riscv_hartid_to_cpuid(int hartid)
  61 {
  62         if (hartid == boot_cpu_hartid)
  63                 return 0;
  64
  65         return -1;
  66 }
  67 static inline unsigned long cpuid_to_hartid_map(int cpu)
  68 {
  69         return boot_cpu_hartid;
  70 }
  71
  72 static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
  73                                               struct cpumask *out)
  74 {
  75         cpumask_set_cpu(cpuid_to_hartid_map(0), out);
  76 }
  77
  78 #endif /* CONFIG_SMP */
  79 #endif /* _ASM_RISCV_SMP_H */