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 */
 7#ifndef __ASM_SMP_H
 8#define __ASM_SMP_H
 9
 
 
 
10#include <asm/sigp.h>
11#include <asm/lowcore.h>
12#include <asm/processor.h>
 
 
13
14#define raw_smp_processor_id()	(S390_lowcore.cpu_nr)
15
16extern struct mutex smp_cpu_state_mutex;
17extern unsigned int smp_cpu_mt_shift;
18extern unsigned int smp_cpu_mtid;
19extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
20extern cpumask_t cpu_setup_mask;
21
22extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
 
23
24extern void arch_send_call_function_single_ipi(int cpu);
25extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
26
27extern void smp_call_online_cpu(void (*func)(void *), void *);
28extern void smp_call_ipl_cpu(void (*func)(void *), void *);
29extern void smp_emergency_stop(void);
30
31extern int smp_find_processor_id(u16 address);
32extern int smp_store_status(int cpu);
33extern void smp_save_dump_ipl_cpu(void);
34extern void smp_save_dump_secondary_cpus(void);
35extern void smp_yield_cpu(int cpu);
36extern void smp_cpu_set_polarization(int cpu, int val);
37extern int smp_cpu_get_polarization(int cpu);
38extern int smp_cpu_get_cpu_address(int cpu);
39extern void smp_fill_possible_mask(void);
40extern void smp_detect_cpus(void);
41
42static inline void smp_stop_cpu(void)
 
 
 
 
43{
44	u16 pcpu = stap();
45
46	for (;;) {
47		__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
48		cpu_relax();
 
 
 
 
 
 
 
49	}
 
50}
51
52/* Return thread 0 CPU number as base CPU */
53static inline int smp_get_base_cpu(int cpu)
54{
55	return cpu - (cpu % (smp_cpu_mtid + 1));
56}
57
58static inline void smp_cpus_done(unsigned int max_cpus)
59{
 
60}
61
62extern int smp_reinit_ipl_cpu(void);
 
 
 
 
63extern int smp_rescan_cpus(void);
64extern void __noreturn cpu_die(void);
65extern void __cpu_die(unsigned int cpu);
66extern int __cpu_disable(void);
67extern void schedule_mcck_handler(void);
68void notrace smp_yield_cpu(int cpu);
69
70#endif /* __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
15extern void machine_restart_smp(char *);
16extern void machine_halt_smp(void);
17extern void machine_power_off_smp(void);
18
19#define raw_smp_processor_id()	(S390_lowcore.cpu_nr)
20
21extern int __cpu_disable (void);
22extern void __cpu_die (unsigned int cpu);
23extern int __cpu_up (unsigned int cpu);
 
 
24
25extern struct mutex smp_cpu_state_mutex;
26extern int smp_cpu_polarization[];
27
28extern void arch_send_call_function_single_ipi(int cpu);
29extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
30
31extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
32
33extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
34extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
35			      int from, int to);
36extern void smp_restart_cpu(void);
 
 
 
 
 
 
 
 
37
38/*
39 * returns 1 if (virtual) cpu is scheduled
40 * returns 0 otherwise
41 */
42static inline int smp_vcpu_scheduled(int cpu)
43{
44	u32 status;
45
46	switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) {
47	case sigp_status_stored:
48		/* Check for running status */
49		if (status & 0x400)
50			return 0;
51		break;
52	case sigp_not_operational:
53		return 0;
54	default:
55		break;
56	}
57	return 1;
58}
59
60#else /* CONFIG_SMP */
 
 
 
 
61
62static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
63{
64	func(data);
65}
66
67#define smp_vcpu_scheduled	(1)
68
69#endif /* CONFIG_SMP */
70
71#ifdef CONFIG_HOTPLUG_CPU
72extern int smp_rescan_cpus(void);
73extern void __noreturn cpu_die(void);
74#else
75static inline int smp_rescan_cpus(void) { return 0; }
76static inline void cpu_die(void) { }
77#endif
78
79#endif /* __ASM_SMP_H */