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