arch/riscv/include/asm/smp.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  */
   5
   6 #ifndef _ASM_RISCV_SMP_H
   7 #define _ASM_RISCV_SMP_H
   8
   9 #include <linux/cpumask.h>
  10 #include <linux/irqreturn.h>
  11 #include <linux/thread_info.h>
  12
  13 #define INVALID_HARTID ULONG_MAX
  14
  15 struct seq_file;
  16 extern unsigned long boot_cpu_hartid;
  17
  18 #ifdef CONFIG_SMP
  19
  20 #include <linux/jump_label.h>
  21
  22 /*
  23  * Mapping between linux logical cpu index and hartid.
  24  */
  25 extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
  26 #define cpuid_to_hartid_map(cpu)    __cpuid_to_hartid_map[cpu]
  27
  28 /* print IPI stats */
  29 void show_ipi_stats(struct seq_file *p, int prec);
  30
  31 /* SMP initialization hook for setup_arch */
  32 void __init setup_smp(void);
  33
  34 /* Hook for the generic smp_call_function_many() routine. */
  35 void arch_send_call_function_ipi_mask(struct cpumask *mask);
  36
  37 /* Hook for the generic smp_call_function_single() routine. */
  38 void arch_send_call_function_single_ipi(int cpu);
  39
  40 int riscv_hartid_to_cpuid(unsigned long hartid);
  41
  42 /* Enable IPI for CPU hotplug */
  43 void riscv_ipi_enable(void);
  44
  45 /* Disable IPI for CPU hotplug */
  46 void riscv_ipi_disable(void);
  47
  48 /* Check if IPI interrupt numbers are available */
  49 bool riscv_ipi_have_virq_range(void);
  50
  51 /* Set the IPI interrupt numbers for arch (called by irqchip drivers) */
  52 void riscv_ipi_set_virq_range(int virq, int nr);
  53
  54 /* Check other CPUs stop or not */
  55 bool smp_crash_stop_failed(void);
  56
  57 /* Secondary hart entry */
  58 asmlinkage void smp_callin(void);
  59
  60 /*
  61  * Obtains the hart ID of the currently executing task.  This relies on
  62  * THREAD_INFO_IN_TASK, but we define that unconditionally.
  63  */
  64 #define raw_smp_processor_id() (current_thread_info()->cpu)
  65
  66 #if defined CONFIG_HOTPLUG_CPU
  67 int __cpu_disable(void);
  68 static inline void __cpu_die(unsigned int cpu) { }
  69 #endif /* CONFIG_HOTPLUG_CPU */
  70
  71 #else
  72
  73 static inline void show_ipi_stats(struct seq_file *p, int prec)
  74 {
  75 }
  76
  77 static inline int riscv_hartid_to_cpuid(unsigned long hartid)
  78 {
  79         if (hartid == boot_cpu_hartid)
  80                 return 0;
  81
  82         return -1;
  83 }
  84 static inline unsigned long cpuid_to_hartid_map(int cpu)
  85 {
  86         return boot_cpu_hartid;
  87 }
  88
  89 static inline void riscv_ipi_enable(void)
  90 {
  91 }
  92
  93 static inline void riscv_ipi_disable(void)
  94 {
  95 }
  96
  97 static inline bool riscv_ipi_have_virq_range(void)
  98 {
  99         return false;
 100 }
 101
 102 static inline void riscv_ipi_set_virq_range(int virq, int nr)
 103 {
 104 }
 105
 106 #endif /* CONFIG_SMP */
 107
 108 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
 109 bool cpu_has_hotplug(unsigned int cpu);
 110 #else
 111 static inline bool cpu_has_hotplug(unsigned int cpu)
 112 {
 113         return false;
 114 }
 115 #endif
 116
 117 #endif /* _ASM_RISCV_SMP_H */