mirror of https://gitee.com/openkylin/linux.git
154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
/*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_SMP_H
|
|
#define __ASM_SMP_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 */
|
|
#define CPU_STUCK_IN_KERNEL (2)
|
|
/* 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>
|
|
|
|
DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
|
|
|
|
/*
|
|
* 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))
|
|
|
|
struct seq_file;
|
|
|
|
/*
|
|
* generate IPI list text
|
|
*/
|
|
extern void show_ipi_list(struct seq_file *p, int prec);
|
|
|
|
/*
|
|
* Called from C code, this handles an IPI.
|
|
*/
|
|
extern void handle_IPI(int ipinr, struct pt_regs *regs);
|
|
|
|
/*
|
|
* Discover the set of possible CPUs and determine their
|
|
* SMP operations.
|
|
*/
|
|
extern void smp_init_cpus(void);
|
|
|
|
/*
|
|
* Provide a function to raise an IPI cross call on CPUs in callmap.
|
|
*/
|
|
extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
|
|
|
|
extern void (*__smp_cross_call)(const struct cpumask *, unsigned int);
|
|
|
|
/*
|
|
* 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.
|
|
* @stack - sp for the secondary CPU
|
|
* @status - Result passed back from the secondary CPU to
|
|
* indicate failure.
|
|
*/
|
|
struct secondary_data {
|
|
void *stack;
|
|
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);
|
|
|
|
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
|
|
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
|
|
#else
|
|
static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
|
|
{
|
|
BUILD_BUG();
|
|
}
|
|
#endif
|
|
|
|
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 (;;) {
|
|
wfe();
|
|
wfi();
|
|
}
|
|
}
|
|
|
|
static inline void update_cpu_boot_status(int val)
|
|
{
|
|
WRITE_ONCE(secondary_data.status, val);
|
|
/* Ensure the visibility of the status update */
|
|
dsb(ishst);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
update_cpu_boot_status(CPU_PANIC_KERNEL);
|
|
cpu_park_loop();
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
#endif /* ifndef __ASSEMBLY__ */
|
|
|
|
#endif /* ifndef __ASM_SMP_H */
|