arch/s390/include/asm/smp.h

   1 /*
   2  *    Copyright IBM Corp. 1999, 2012
   3  *    Author(s): Denis Joseph Barrow,
   4  *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
   5  *               Heiko Carstens <heiko.carstens@de.ibm.com>,
   6  */
   7 #ifndef __ASM_SMP_H
   8 #define __ASM_SMP_H
   9
  10 #include <asm/sigp.h>
  11
  12 #ifdef CONFIG_SMP
  13
  14 #include <asm/lowcore.h>
  15
  16 #define raw_smp_processor_id()  (S390_lowcore.cpu_nr)
  17
  18 extern struct mutex smp_cpu_state_mutex;
  19
  20 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
  21
  22 extern void arch_send_call_function_single_ipi(int cpu);
  23 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  24
  25 extern void smp_call_online_cpu(void (*func)(void *), void *);
  26 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
  27
  28 extern int smp_find_processor_id(u16 address);
  29 extern int smp_store_status(int cpu);
  30 extern int smp_vcpu_scheduled(int cpu);
  31 extern void smp_yield_cpu(int cpu);
  32 extern void smp_cpu_set_polarization(int cpu, int val);
  33 extern int smp_cpu_get_polarization(int cpu);
  34 extern void smp_fill_possible_mask(void);
  35
  36 #else /* CONFIG_SMP */
  37
  38 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
  39 {
  40         func(data);
  41 }
  42
  43 static inline void smp_call_online_cpu(void (*func)(void *), void *data)
  44 {
  45         func(data);
  46 }
  47
  48 static inline int smp_find_processor_id(u16 address) { return 0; }
  49 static inline int smp_store_status(int cpu) { return 0; }
  50 static inline int smp_vcpu_scheduled(int cpu) { return 1; }
  51 static inline void smp_yield_cpu(int cpu) { }
  52 static inline void smp_fill_possible_mask(void) { }
  53
  54 #endif /* CONFIG_SMP */
  55
  56 static inline void smp_stop_cpu(void)
  57 {
  58         u16 pcpu = stap();
  59
  60         for (;;) {
  61                 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
  62                 cpu_relax();
  63         }
  64 }
  65
  66 #ifdef CONFIG_HOTPLUG_CPU
  67 extern int smp_rescan_cpus(void);
  68 extern void __noreturn cpu_die(void);
  69 extern void __cpu_die(unsigned int cpu);
  70 extern int __cpu_disable(void);
  71 #else
  72 static inline int smp_rescan_cpus(void) { return 0; }
  73 static inline void cpu_die(void) { }
  74 #endif
  75
  76 #endif /* __ASM_SMP_H */