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Current File : //lib/modules/4.15.0-1044-aws/build/arch/s390/include/asm/smp.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
 *    Copyright IBM Corp. 1999, 2012
 *    Author(s): Denis Joseph Barrow,
 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>,
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>,
 */
#ifndef __ASM_SMP_H
#define __ASM_SMP_H

#include <asm/sigp.h>

#ifdef CONFIG_SMP

#include <asm/lowcore.h>

#define raw_smp_processor_id()	(S390_lowcore.cpu_nr)

extern struct mutex smp_cpu_state_mutex;
extern unsigned int smp_cpu_mt_shift;
extern unsigned int smp_cpu_mtid;
extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];

extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);

extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);

extern void smp_call_online_cpu(void (*func)(void *), void *);
extern void smp_call_ipl_cpu(void (*func)(void *), void *);
extern void smp_emergency_stop(void);

extern int smp_find_processor_id(u16 address);
extern int smp_store_status(int cpu);
extern void smp_save_dump_cpus(void);
extern int smp_vcpu_scheduled(int cpu);
extern void smp_yield_cpu(int cpu);
extern void smp_cpu_set_polarization(int cpu, int val);
extern int smp_cpu_get_polarization(int cpu);
extern void smp_fill_possible_mask(void);
extern void smp_detect_cpus(void);

#else /* CONFIG_SMP */

#define smp_cpu_mtid	0

static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
{
	func(data);
}

static inline void smp_call_online_cpu(void (*func)(void *), void *data)
{
	func(data);
}

static inline void smp_emergency_stop(void)
{
}

static inline int smp_find_processor_id(u16 address) { return 0; }
static inline int smp_store_status(int cpu) { return 0; }
static inline int smp_vcpu_scheduled(int cpu) { return 1; }
static inline void smp_yield_cpu(int cpu) { }
static inline void smp_fill_possible_mask(void) { }
static inline void smp_detect_cpus(void) { }

#endif /* CONFIG_SMP */

static inline void smp_stop_cpu(void)
{
	u16 pcpu = stap();

	for (;;) {
		__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
		cpu_relax();
	}
}

/* Return thread 0 CPU number as base CPU */
static inline int smp_get_base_cpu(int cpu)
{
	return cpu - (cpu % (smp_cpu_mtid + 1));
}

#ifdef CONFIG_HOTPLUG_CPU
extern int smp_rescan_cpus(void);
extern void __noreturn cpu_die(void);
extern void __cpu_die(unsigned int cpu);
extern int __cpu_disable(void);
#else
static inline int smp_rescan_cpus(void) { return 0; }
static inline void cpu_die(void) { }
#endif

#endif /* __ASM_SMP_H */

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