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 extern unsigned int smp_cpu_mt_shift; 20 extern unsigned int smp_cpu_mtid; 21 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS]; 22 23 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle); 24 25 extern void arch_send_call_function_single_ipi(int cpu); 26 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 27 28 extern void smp_call_online_cpu(void (*func)(void *), void *); 29 extern void smp_call_ipl_cpu(void (*func)(void *), void *); 30 31 extern int smp_find_processor_id(u16 address); 32 extern int smp_store_status(int cpu); 33 extern void smp_save_dump_cpus(void); 34 extern int smp_vcpu_scheduled(int cpu); 35 extern void smp_yield_cpu(int cpu); 36 extern void smp_cpu_set_polarization(int cpu, int val); 37 extern int smp_cpu_get_polarization(int cpu); 38 extern void smp_fill_possible_mask(void); 39 extern void smp_detect_cpus(void); 40 41 #else /* CONFIG_SMP */ 42 43 #define smp_cpu_mtid 0 44 45 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data) 46 { 47 func(data); 48 } 49 50 static inline void smp_call_online_cpu(void (*func)(void *), void *data) 51 { 52 func(data); 53 } 54 55 static inline int smp_find_processor_id(u16 address) { return 0; } 56 static inline int smp_store_status(int cpu) { return 0; } 57 static inline int smp_vcpu_scheduled(int cpu) { return 1; } 58 static inline void smp_yield_cpu(int cpu) { } 59 static inline void smp_fill_possible_mask(void) { } 60 static inline void smp_detect_cpus(void) { } 61 62 #endif /* CONFIG_SMP */ 63 64 static inline void smp_stop_cpu(void) 65 { 66 u16 pcpu = stap(); 67 68 for (;;) { 69 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL); 70 cpu_relax(); 71 } 72 } 73 74 /* Return thread 0 CPU number as base CPU */ 75 static inline int smp_get_base_cpu(int cpu) 76 { 77 return cpu - (cpu % (smp_cpu_mtid + 1)); 78 } 79 80 #ifdef CONFIG_HOTPLUG_CPU 81 extern int smp_rescan_cpus(void); 82 extern void __noreturn cpu_die(void); 83 extern void __cpu_die(unsigned int cpu); 84 extern int __cpu_disable(void); 85 #else 86 static inline int smp_rescan_cpus(void) { return 0; } 87 static inline void cpu_die(void) { } 88 #endif 89 90 #endif /* __ASM_SMP_H */ 91