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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> | |
68db0cf1 | 11 | #include <linux/sched/task_stack.h> |
7aa1c8f4 RB |
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 | |
c80e1b62 | 18 | static void crash_shutdown_secondary(void *passed_regs) |
7aa1c8f4 | 19 | { |
c80e1b62 | 20 | struct pt_regs *regs = passed_regs; |
7aa1c8f4 RB |
21 | int cpu = smp_processor_id(); |
22 | ||
c80e1b62 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(); | |
8dd92891 | 39 | if (!cpumask_test_cpu(cpu, &cpus_in_crash)) |
7aa1c8f4 | 40 | crash_save_cpu(regs, cpu); |
8dd92891 | 41 | cpumask_set_cpu(cpu, &cpus_in_crash); |
7aa1c8f4 RB |
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 | { | |
54c721b8 | 51 | static int cpus_stopped; |
7aa1c8f4 | 52 | unsigned int msecs; |
54c721b8 | 53 | unsigned int ncpus; |
7aa1c8f4 | 54 | |
54c721b8 HK |
55 | if (cpus_stopped) |
56 | return; | |
57 | ||
58 | ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ | |
7aa1c8f4 | 59 | |
c83c2eed | 60 | smp_call_function(crash_shutdown_secondary, NULL, 0); |
7aa1c8f4 RB |
61 | smp_wmb(); |
62 | ||
63 | /* | |
64 | * The crash CPU sends an IPI and wait for other CPUs to | |
65 | * respond. Delay of at least 10 seconds. | |
66 | */ | |
67 | pr_emerg("Sending IPI to other cpus...\n"); | |
68 | msecs = 10000; | |
8dd92891 | 69 | while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) { |
7aa1c8f4 RB |
70 | cpu_relax(); |
71 | mdelay(1); | |
72 | } | |
54c721b8 HK |
73 | |
74 | cpus_stopped = 1; | |
75 | } | |
76 | ||
77 | /* Override the weak function in kernel/panic.c */ | |
78 | void crash_smp_send_stop(void) | |
79 | { | |
80 | if (_crash_smp_send_stop) | |
81 | _crash_smp_send_stop(); | |
82 | ||
83 | crash_kexec_prepare_cpus(); | |
7aa1c8f4 RB |
84 | } |
85 | ||
86 | #else /* !defined(CONFIG_SMP) */ | |
87 | static void crash_kexec_prepare_cpus(void) {} | |
70342287 | 88 | #endif /* !defined(CONFIG_SMP) */ |
7aa1c8f4 RB |
89 | |
90 | void default_machine_crash_shutdown(struct pt_regs *regs) | |
91 | { | |
92 | local_irq_disable(); | |
93 | crashing_cpu = smp_processor_id(); | |
94 | crash_save_cpu(regs, crashing_cpu); | |
95 | crash_kexec_prepare_cpus(); | |
8dd92891 | 96 | cpumask_set_cpu(crashing_cpu, &cpus_in_crash); |
7aa1c8f4 | 97 | } |