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/* SPDX-License-Identifier: GPL-2.0-only */
* Copyright (C) 2012 ARM Ltd.
#ifndef __ASM_SMP_H
#define __ASM_SMP_H
#include <linux/const.h>
/* Values for secondary_data.status */
#define CPU_MMU_OFF (-1)
#define CPU_BOOT_SUCCESS (0)
/* The cpu invoked ops->cpu_die, synchronise it with cpu_kill */
#define CPU_KILL_ME (1)
/* The cpu couldn't die gracefully and is looping in the kernel */
/* Fatal system error detected by secondary CPU, crash the system */
#define CPU_PANIC_KERNEL (3)
#ifndef __ASSEMBLY__
#include <asm/percpu.h>
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/thread_info.h>
* We don't use this_cpu_read(cpu_number) as that has implicit writes to
* preempt_count, and associated (compiler) barriers, that we'd like to avoid
* the expense of. If we're preemptible, the value can be stale at use anyway.
* And we can't use this_cpu_ptr() either, as that winds up recursing back
* here under CONFIG_DEBUG_PREEMPT=y.
#define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))
* Logical CPU mapping.
extern u64 __cpu_logical_map[NR_CPUS];
extern u64 cpu_logical_map(unsigned int cpu);
static inline void set_cpu_logical_map(unsigned int cpu, u64 hwid)
__cpu_logical_map[cpu] = hwid;
struct seq_file;
* Discover the set of possible CPUs and determine their
* SMP operations.
extern void smp_init_cpus(void);
* Register IPI interrupts with the arch SMP code
extern void set_smp_ipi_range(int ipi_base, int nr_ipi);
* Called from the secondary holding pen, this is the secondary CPU entry point.
asmlinkage void secondary_start_kernel(void);
* Initial data for bringing up a secondary CPU.
* @status - Result passed back from the secondary CPU to
* indicate failure.
struct secondary_data {
struct task_struct *task;
long status;
extern struct secondary_data secondary_data;
extern long __early_cpu_boot_status;
extern void secondary_entry(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
extern void cpu_die(void);
extern void cpu_die_early(void);
static inline void cpu_park_loop(void)
for (;;) {
static inline void update_cpu_boot_status(int val)
WRITE_ONCE(secondary_data.status, val);
/* Ensure the visibility of the status update */
* The calling secondary CPU has detected serious configuration mismatch,
* which calls for a kernel panic. Update the boot status and park the calling
* CPU.
static inline void cpu_panic_kernel(void)
* If a secondary CPU enters the kernel but fails to come online,
* (e.g. due to mismatched features), and cannot exit the kernel,
* we increment cpus_stuck_in_kernel and leave the CPU in a
* quiesecent loop within the kernel text. The memory containing
* this loop must not be re-used for anything else as the 'stuck'
* core is executing it.
* This function is used to inhibit features like kexec and hibernate.
bool cpus_are_stuck_in_kernel(void);
extern void crash_smp_send_stop(void);
extern bool smp_crash_stop_failed(void);
extern void panic_smp_self_stop(void);
#endif /* ifndef __ASSEMBLY__ */
#endif /* ifndef __ASM_SMP_H */