Commit | Line | Data |
---|---|---|
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> | |
8 | #include <linux/init.h> | |
9 | #include <linux/irq.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/sched.h> | |
12 | ||
13 | /* This keeps a track of which one is crashing cpu. */ | |
14 | static int crashing_cpu = -1; | |
15 | static cpumask_t cpus_in_crash = CPU_MASK_NONE; | |
16 | ||
17 | #ifdef CONFIG_SMP | |
32b0616e | 18 | static void crash_shutdown_secondary(void *passed_regs) |
7aa1c8f4 | 19 | { |
32b0616e | 20 | struct pt_regs *regs = passed_regs; |
7aa1c8f4 RB |
21 | int cpu = smp_processor_id(); |
22 | ||
32b0616e CM |
23 | /* |
24 | * If we are passed registers, use those. Otherwise get the | |
25 | * regs from the last interrupt, which should be correct, as | |
26 | * we are in an interrupt. But if the regs are not there, | |
27 | * pull them from the top of the stack. They are probably | |
28 | * wrong, but we need something to keep from crashing again. | |
29 | */ | |
30 | if (!regs) | |
31 | regs = get_irq_regs(); | |
32 | if (!regs) | |
33 | regs = task_pt_regs(current); | |
7aa1c8f4 RB |
34 | |
35 | if (!cpu_online(cpu)) | |
36 | return; | |
37 | ||
38 | local_irq_disable(); | |
39 | if (!cpu_isset(cpu, cpus_in_crash)) | |
40 | crash_save_cpu(regs, cpu); | |
41 | cpu_set(cpu, cpus_in_crash); | |
42 | ||
43 | while (!atomic_read(&kexec_ready_to_reboot)) | |
44 | cpu_relax(); | |
45 | relocated_kexec_smp_wait(NULL); | |
46 | /* NOTREACHED */ | |
47 | } | |
48 | ||
49 | static void crash_kexec_prepare_cpus(void) | |
50 | { | |
51 | unsigned int msecs; | |
52 | ||
53 | unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ | |
54 | ||
55 | dump_send_ipi(crash_shutdown_secondary); | |
56 | smp_wmb(); | |
57 | ||
58 | /* | |
59 | * The crash CPU sends an IPI and wait for other CPUs to | |
60 | * respond. Delay of at least 10 seconds. | |
61 | */ | |
62 | pr_emerg("Sending IPI to other cpus...\n"); | |
63 | msecs = 10000; | |
64 | while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) { | |
65 | cpu_relax(); | |
66 | mdelay(1); | |
67 | } | |
68 | } | |
69 | ||
70 | #else /* !defined(CONFIG_SMP) */ | |
71 | static void crash_kexec_prepare_cpus(void) {} | |
70342287 | 72 | #endif /* !defined(CONFIG_SMP) */ |
7aa1c8f4 RB |
73 | |
74 | void default_machine_crash_shutdown(struct pt_regs *regs) | |
75 | { | |
76 | local_irq_disable(); | |
77 | crashing_cpu = smp_processor_id(); | |
78 | crash_save_cpu(regs, crashing_cpu); | |
79 | crash_kexec_prepare_cpus(); | |
80 | cpu_set(crashing_cpu, cpus_in_crash); | |
81 | } |