1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Denis Joseph Barrow,
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>,
7 */
8 #ifndef __ASM_SMP_H
9 #define __ASM_SMP_H
10
11 #include <asm/sigp.h>
12 #include <asm/lowcore.h>
13
14 #define raw_smp_processor_id() (S390_lowcore.cpu_nr)
15
16 extern struct mutex smp_cpu_state_mutex;
17 extern unsigned int smp_cpu_mt_shift;
18 extern unsigned int smp_cpu_mtid;
19 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
20
21 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
22
23 extern void arch_send_call_function_single_ipi(int cpu);
24 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
25
26 extern void smp_call_online_cpu(void (*func)(void *), void *);
27 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
28 extern void smp_emergency_stop(void);
29
30 extern int smp_find_processor_id(u16 address);
31 extern int smp_store_status(int cpu);
32 extern void smp_save_dump_cpus(void);
33 extern int smp_vcpu_scheduled(int cpu);
34 extern void smp_yield_cpu(int cpu);
35 extern void smp_cpu_set_polarization(int cpu, int val);
36 extern int smp_cpu_get_polarization(int cpu);
37 extern void smp_fill_possible_mask(void);
38 extern void smp_detect_cpus(void);
39
smp_stop_cpu(void)40 static inline void smp_stop_cpu(void)
41 {
42 u16 pcpu = stap();
43
44 for (;;) {
45 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
46 cpu_relax();
47 }
48 }
49
50 /* Return thread 0 CPU number as base CPU */
smp_get_base_cpu(int cpu)51 static inline int smp_get_base_cpu(int cpu)
52 {
53 return cpu - (cpu % (smp_cpu_mtid + 1));
54 }
55
56 extern int smp_rescan_cpus(void);
57 extern void __noreturn cpu_die(void);
58 extern void __cpu_die(unsigned int cpu);
59 extern int __cpu_disable(void);
60
61 #endif /* __ASM_SMP_H */
62