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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. */ | |
13 | static int crashing_cpu = -1; | |
14 | static cpumask_t cpus_in_crash = CPU_MASK_NONE; | |
15 | ||
16 | #ifdef CONFIG_SMP | |
17 | static 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 | ||
38 | static 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) */ | |
60 | static void crash_kexec_prepare_cpus(void) {} | |
70342287 | 61 | #endif /* !defined(CONFIG_SMP) */ |
7aa1c8f4 RB |
62 | |
63 | void 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 | } |