mirror of https://gitee.com/openkylin/linux.git
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/crash_dump.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
|
|
/* This keeps a track of which one is crashing cpu. */
|
|
static int crashing_cpu = -1;
|
|
static cpumask_t cpus_in_crash = CPU_MASK_NONE;
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void crash_shutdown_secondary(void *ignore)
|
|
{
|
|
struct pt_regs *regs;
|
|
int cpu = smp_processor_id();
|
|
|
|
regs = task_pt_regs(current);
|
|
|
|
if (!cpu_online(cpu))
|
|
return;
|
|
|
|
local_irq_disable();
|
|
if (!cpu_isset(cpu, cpus_in_crash))
|
|
crash_save_cpu(regs, cpu);
|
|
cpu_set(cpu, cpus_in_crash);
|
|
|
|
while (!atomic_read(&kexec_ready_to_reboot))
|
|
cpu_relax();
|
|
relocated_kexec_smp_wait(NULL);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void crash_kexec_prepare_cpus(void)
|
|
{
|
|
unsigned int msecs;
|
|
|
|
unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
|
|
|
|
dump_send_ipi(crash_shutdown_secondary);
|
|
smp_wmb();
|
|
|
|
/*
|
|
* The crash CPU sends an IPI and wait for other CPUs to
|
|
* respond. Delay of at least 10 seconds.
|
|
*/
|
|
pr_emerg("Sending IPI to other cpus...\n");
|
|
msecs = 10000;
|
|
while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
|
|
cpu_relax();
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
#else /* !defined(CONFIG_SMP) */
|
|
static void crash_kexec_prepare_cpus(void) {}
|
|
#endif /* !defined(CONFIG_SMP) */
|
|
|
|
void default_machine_crash_shutdown(struct pt_regs *regs)
|
|
{
|
|
local_irq_disable();
|
|
crashing_cpu = smp_processor_id();
|
|
crash_save_cpu(regs, crashing_cpu);
|
|
crash_kexec_prepare_cpus();
|
|
cpu_set(crashing_cpu, cpus_in_crash);
|
|
}
|