Release 4.14 arch/mips/kernel/crash.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/reboot.h>
#include <linux/kexec.h>
#include <linux/bootmem.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;
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();
relocated_kexec_smp_wait(NULL);
/* NOTREACHED */
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 79 | 77.45% | 1 | 33.33% |
| Corey Minyard | 19 | 18.63% | 1 | 33.33% |
| Rusty Russell | 4 | 3.92% | 1 | 33.33% |
| Total | 102 | 100.00% | 3 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 63 | 71.59% | 1 | 25.00% |
| Hidehiro Kawai | 18 | 20.45% | 1 | 25.00% |
| Marcin Nowakowski | 5 | 5.68% | 1 | 25.00% |
| Rusty Russell | 2 | 2.27% | 1 | 25.00% |
| Total | 88 | 100.00% | 4 | 100.00% |
/* 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();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hidehiro Kawai | 16 | 94.12% | 1 | 50.00% |
| Ralf Bächle | 1 | 5.88% | 1 | 50.00% |
| Total | 17 | 100.00% | 2 | 100.00% |
#else /* !defined(CONFIG_SMP) */
static void crash_kexec_prepare_cpus(void) {}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 7 | 100.00% | 1 | 100.00% |
| Total | 7 | 100.00% | 1 | 100.00% |
#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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 34 | 94.44% | 1 | 50.00% |
| Rusty Russell | 2 | 5.56% | 1 | 50.00% |
| Total | 36 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 237 | 76.95% | 2 | 25.00% |
| Hidehiro Kawai | 35 | 11.36% | 1 | 12.50% |
| Corey Minyard | 19 | 6.17% | 1 | 12.50% |
| Rusty Russell | 8 | 2.60% | 1 | 12.50% |
| Marcin Nowakowski | 5 | 1.62% | 1 | 12.50% |
| Ingo Molnar | 3 | 0.97% | 1 | 12.50% |
| Greg Kroah-Hartman | 1 | 0.32% | 1 | 12.50% |
| Total | 308 | 100.00% | 8 | 100.00% |
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