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
);
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