Merge remote-tracking branch 'asoc/topic/twl6040' into asoc-next
[deliverable/linux.git] / arch / mips / kernel / crash.c
CommitLineData
7aa1c8f4
RB
1#include <linux/kernel.h>
2#include <linux/smp.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>
7aa1c8f4
RB
8#include <linux/irq.h>
9#include <linux/types.h>
10#include <linux/sched.h>
11
12/* This keeps a track of which one is crashing cpu. */
13static int crashing_cpu = -1;
14static cpumask_t cpus_in_crash = CPU_MASK_NONE;
15
16#ifdef CONFIG_SMP
17static void crash_shutdown_secondary(void *ignore)
18{
19 struct pt_regs *regs;
20 int cpu = smp_processor_id();
21
22 regs = task_pt_regs(current);
23
24 if (!cpu_online(cpu))
25 return;
26
27 local_irq_disable();
8dd92891 28 if (!cpumask_test_cpu(cpu, &cpus_in_crash))
7aa1c8f4 29 crash_save_cpu(regs, cpu);
8dd92891 30 cpumask_set_cpu(cpu, &cpus_in_crash);
7aa1c8f4
RB
31
32 while (!atomic_read(&kexec_ready_to_reboot))
33 cpu_relax();
34 relocated_kexec_smp_wait(NULL);
35 /* NOTREACHED */
36}
37
38static void crash_kexec_prepare_cpus(void)
39{
40 unsigned int msecs;
41
42 unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
43
44 dump_send_ipi(crash_shutdown_secondary);
45 smp_wmb();
46
47 /*
48 * The crash CPU sends an IPI and wait for other CPUs to
49 * respond. Delay of at least 10 seconds.
50 */
51 pr_emerg("Sending IPI to other cpus...\n");
52 msecs = 10000;
8dd92891 53 while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) {
7aa1c8f4
RB
54 cpu_relax();
55 mdelay(1);
56 }
57}
58
59#else /* !defined(CONFIG_SMP) */
60static void crash_kexec_prepare_cpus(void) {}
70342287 61#endif /* !defined(CONFIG_SMP) */
7aa1c8f4
RB
62
63void default_machine_crash_shutdown(struct pt_regs *regs)
64{
65 local_irq_disable();
66 crashing_cpu = smp_processor_id();
67 crash_save_cpu(regs, crashing_cpu);
68 crash_kexec_prepare_cpus();
8dd92891 69 cpumask_set_cpu(crashing_cpu, &cpus_in_crash);
7aa1c8f4 70}
This page took 0.174416 seconds and 5 git commands to generate.