arch/s390/include/asm/smp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *    Copyright IBM Corp. 1999, 2012
   4  *    Author(s): Denis Joseph Barrow,
   5  *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
   6  *               Heiko Carstens <heiko.carstens@de.ibm.com>,
   7  */
   8 #ifndef __ASM_SMP_H
   9 #define __ASM_SMP_H
  10
  11 #include <asm/sigp.h>
  12
  13 #ifdef CONFIG_SMP
  14
  15 #include <asm/lowcore.h>
  16
  17 #define raw_smp_processor_id()  (S390_lowcore.cpu_nr)
  18
  19 extern struct mutex smp_cpu_state_mutex;
  20 extern unsigned int smp_cpu_mt_shift;
  21 extern unsigned int smp_cpu_mtid;
  22 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
  23
  24 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
  25
  26 extern void arch_send_call_function_single_ipi(int cpu);
  27 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  28
  29 extern void smp_call_online_cpu(void (*func)(void *), void *);
  30 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
  31 extern void smp_emergency_stop(void);
  32
  33 extern int smp_find_processor_id(u16 address);
  34 extern int smp_store_status(int cpu);
  35 extern void smp_save_dump_cpus(void);
  36 extern int smp_vcpu_scheduled(int cpu);
  37 extern void smp_yield_cpu(int cpu);
  38 extern void smp_cpu_set_polarization(int cpu, int val);
  39 extern int smp_cpu_get_polarization(int cpu);
  40 extern void smp_fill_possible_mask(void);
  41 extern void smp_detect_cpus(void);
  42
  43 #else /* CONFIG_SMP */
  44
  45 #define smp_cpu_mtid    0
  46
  47 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
  48 {
  49         func(data);
  50 }
  51
  52 static inline void smp_call_online_cpu(void (*func)(void *), void *data)
  53 {
  54         func(data);
  55 }
  56
  57 static inline void smp_emergency_stop(void)
  58 {
  59 }
  60
  61 static inline int smp_find_processor_id(u16 address) { return 0; }
  62 static inline int smp_store_status(int cpu) { return 0; }
  63 static inline int smp_vcpu_scheduled(int cpu) { return 1; }
  64 static inline void smp_yield_cpu(int cpu) { }
  65 static inline void smp_fill_possible_mask(void) { }
  66 static inline void smp_detect_cpus(void) { }
  67
  68 #endif /* CONFIG_SMP */
  69
  70 static inline void smp_stop_cpu(void)
  71 {
  72         u16 pcpu = stap();
  73
  74         for (;;) {
  75                 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
  76                 cpu_relax();
  77         }
  78 }
  79
  80 /* Return thread 0 CPU number as base CPU */
  81 static inline int smp_get_base_cpu(int cpu)
  82 {
  83         return cpu - (cpu % (smp_cpu_mtid + 1));
  84 }
  85
  86 #ifdef CONFIG_HOTPLUG_CPU
  87 extern int smp_rescan_cpus(void);
  88 extern void __noreturn cpu_die(void);
  89 extern void __cpu_die(unsigned int cpu);
  90 extern int __cpu_disable(void);
  91 #else
  92 static inline int smp_rescan_cpus(void) { return 0; }
  93 static inline void cpu_die(void) { }
  94 #endif
  95
  96 #endif /* __ASM_SMP_H */