1 #include <linux/kernel.h>
3 #include <linux/reboot.h>
4 #include <linux/kexec.h>
5 #include <linux/bootmem.h>
6 #include <linux/crash_dump.h>
7 #include <linux/delay.h>
9 #include <linux/types.h>
10 #include <linux/sched.h>
12 /* This keeps a track of which one is crashing cpu. */
13 static int crashing_cpu = -1;
14 static cpumask_t cpus_in_crash = CPU_MASK_NONE;
17 static void crash_shutdown_secondary(void *passed_regs)
19 struct pt_regs *regs = passed_regs;
20 int cpu = smp_processor_id();
23 * If we are passed registers, use those. Otherwise get the
24 * regs from the last interrupt, which should be correct, as
25 * we are in an interrupt. But if the regs are not there,
26 * pull them from the top of the stack. They are probably
27 * wrong, but we need something to keep from crashing again.
30 regs = get_irq_regs();
32 regs = task_pt_regs(current);
38 if (!cpumask_test_cpu(cpu, &cpus_in_crash))
39 crash_save_cpu(regs, cpu);
40 cpumask_set_cpu(cpu, &cpus_in_crash);
42 while (!atomic_read(&kexec_ready_to_reboot))
44 relocated_kexec_smp_wait(NULL);
48 static void crash_kexec_prepare_cpus(void)
52 unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
54 dump_send_ipi(crash_shutdown_secondary);
58 * The crash CPU sends an IPI and wait for other CPUs to
59 * respond. Delay of at least 10 seconds.
61 pr_emerg("Sending IPI to other cpus...\n");
63 while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) {
69 #else /* !defined(CONFIG_SMP) */
70 static void crash_kexec_prepare_cpus(void) {}
71 #endif /* !defined(CONFIG_SMP) */
73 void default_machine_crash_shutdown(struct pt_regs *regs)
76 crashing_cpu = smp_processor_id();
77 crash_save_cpu(regs, crashing_cpu);
78 crash_kexec_prepare_cpus();
79 cpumask_set_cpu(crashing_cpu, &cpus_in_crash);