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#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);
}
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