1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/reboot.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/crash_dump.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
/* This keeps a track of which one is crashing cpu. */
static int crashing_cpu = -1;
static cpumask_t cpus_in_crash = CPU_MASK_NONE;
#ifdef CONFIG_SMP
static void crash_shutdown_secondary(void *passed_regs)
{
struct pt_regs *regs = passed_regs;
int cpu = smp_processor_id();
/*
* If we are passed registers, use those. Otherwise get the
* regs from the last interrupt, which should be correct, as
* we are in an interrupt. But if the regs are not there,
* pull them from the top of the stack. They are probably
* wrong, but we need something to keep from crashing again.
*/
if (!regs)
regs = get_irq_regs();
if (!regs)
regs = task_pt_regs(current);
if (!cpu_online(cpu))
return;
/* We won't be sent IPIs any more. */
set_cpu_online(cpu, false);
local_irq_disable();
if (!cpumask_test_cpu(cpu, &cpus_in_crash))
crash_save_cpu(regs, cpu);
cpumask_set_cpu(cpu, &cpus_in_crash);
while (!atomic_read(&kexec_ready_to_reboot))
cpu_relax();
kexec_reboot();
/* NOTREACHED */
}
static void crash_kexec_prepare_cpus(void)
{
static int cpus_stopped;
unsigned int msecs;
unsigned int ncpus;
if (cpus_stopped)
return;
ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
smp_call_function(crash_shutdown_secondary, NULL, 0);
smp_wmb();
/*
* The crash CPU sends an IPI and wait for other CPUs to
* respond. Delay of at least 10 seconds.
*/
pr_emerg("Sending IPI to other cpus...\n");
msecs = 10000;
while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) {
cpu_relax();
mdelay(1);
}
cpus_stopped = 1;
}
/* Override the weak function in kernel/panic.c */
void crash_smp_send_stop(void)
{
if (_crash_smp_send_stop)
_crash_smp_send_stop();
crash_kexec_prepare_cpus();
}
#else /* !defined(CONFIG_SMP) */
static void crash_kexec_prepare_cpus(void) {}
#endif /* !defined(CONFIG_SMP) */
void default_machine_crash_shutdown(struct pt_regs *regs)
{
local_irq_disable();
crashing_cpu = smp_processor_id();
crash_save_cpu(regs, crashing_cpu);
crash_kexec_prepare_cpus();
cpumask_set_cpu(crashing_cpu, &cpus_in_crash);
}
|
