arch/s390/include/asm/smp.h

   1 /*
   2  *    Copyright IBM Corp. 1999,2009
   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 #ifdef CONFIG_SMP
  11
  12 #include <asm/system.h>
  13 #include <asm/sigp.h>
  14
  15 extern void machine_restart_smp(char *);
  16 extern void machine_halt_smp(void);
  17 extern void machine_power_off_smp(void);
  18
  19 #define raw_smp_processor_id()  (S390_lowcore.cpu_nr)
  20
  21 extern int __cpu_disable (void);
  22 extern void __cpu_die (unsigned int cpu);
  23 extern int __cpu_up (unsigned int cpu);
  24
  25 extern struct mutex smp_cpu_state_mutex;
  26 extern int smp_cpu_polarization[];
  27
  28 extern void arch_send_call_function_single_ipi(int cpu);
  29 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  30
  31 extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
  32
  33 extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
  34 extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
  35                               int from, int to);
  36 extern void smp_restart_with_online_cpu(void);
  37 extern void smp_restart_cpu(void);
  38
  39 /*
  40  * returns 1 if (virtual) cpu is scheduled
  41  * returns 0 otherwise
  42  */
  43 static inline int smp_vcpu_scheduled(int cpu)
  44 {
  45         u32 status;
  46
  47         switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) {
  48         case sigp_status_stored:
  49                 /* Check for running status */
  50                 if (status & 0x400)
  51                         return 0;
  52                 break;
  53         case sigp_not_operational:
  54                 return 0;
  55         default:
  56                 break;
  57         }
  58         return 1;
  59 }
  60
  61 #else /* CONFIG_SMP */
  62
  63 static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
  64 {
  65         func(data);
  66 }
  67
  68 static inline void smp_restart_with_online_cpu(void)
  69 {
  70 }
  71
  72 #define smp_vcpu_scheduled      (1)
  73
  74 #endif /* CONFIG_SMP */
  75
  76 #ifdef CONFIG_HOTPLUG_CPU
  77 extern int smp_rescan_cpus(void);
  78 extern void __noreturn cpu_die(void);
  79 #else
  80 static inline int smp_rescan_cpus(void) { return 0; }
  81 static inline void cpu_die(void) { }
  82 #endif
  83
  84 #endif /* __ASM_SMP_H */