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 */ 77