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 struct riscv_ipi_ops {
  19         void (*ipi_inject)(const struct cpumask *target);
  20         void (*ipi_clear)(void);
  21 };
  22
  23 #ifdef CONFIG_SMP
  24 /*
  25  * Mapping between linux logical cpu index and hartid.
  26  */
  27 extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
  28 #define cpuid_to_hartid_map(cpu)    __cpuid_to_hartid_map[cpu]
  29
  30 /* print IPI stats */
  31 void show_ipi_stats(struct seq_file *p, int prec);
  32
  33 /* SMP initialization hook for setup_arch */
  34 void __init setup_smp(void);
  35
  36 /* Called from C code, this handles an IPI. */
  37 void handle_IPI(struct pt_regs *regs);
  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 /* Set custom IPI operations */
  49 void riscv_set_ipi_ops(struct riscv_ipi_ops *ops);
  50
  51 /* Clear IPI for current CPU */
  52 void riscv_clear_ipi(void);
  53
  54 /* Secondary hart entry */
  55 asmlinkage void smp_callin(void);
  56
  57 /*
  58  * Obtains the hart ID of the currently executing task.  This relies on
  59  * THREAD_INFO_IN_TASK, but we define that unconditionally.
  60  */
  61 #define raw_smp_processor_id() (current_thread_info()->cpu)
  62
  63 #if defined CONFIG_HOTPLUG_CPU
  64 int __cpu_disable(void);
  65 void __cpu_die(unsigned int cpu);
  66 void cpu_stop(void);
  67 #else
  68 #endif /* CONFIG_HOTPLUG_CPU */
  69
  70 #else
  71
  72 static inline void show_ipi_stats(struct seq_file *p, int prec)
  73 {
  74 }
  75
  76 static inline int riscv_hartid_to_cpuid(int hartid)
  77 {
  78         if (hartid == boot_cpu_hartid)
  79                 return 0;
  80
  81         return -1;
  82 }
  83 static inline unsigned long cpuid_to_hartid_map(int cpu)
  84 {
  85         return boot_cpu_hartid;
  86 }
  87
  88 static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
  89                                               struct cpumask *out)
  90 {
  91         cpumask_clear(out);
  92         cpumask_set_cpu(boot_cpu_hartid, out);
  93 }
  94
  95 static inline void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
  96 {
  97 }
  98
  99 static inline void riscv_clear_ipi(void)
 100 {
 101 }
 102
 103 #endif /* CONFIG_SMP */
 104
 105 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
 106 bool cpu_has_hotplug(unsigned int cpu);
 107 #else
 108 static inline bool cpu_has_hotplug(unsigned int cpu)
 109 {
 110         return false;
 111 }
 112 #endif
 113
 114 #endif /* _ASM_RISCV_SMP_H */