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103 lines
2.4 KiB
103 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/kernel.h> |
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#include <linux/smp.h> |
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#include <linux/reboot.h> |
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#include <linux/kexec.h> |
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#include <linux/memblock.h> |
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#include <linux/crash_dump.h> |
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#include <linux/delay.h> |
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#include <linux/irq.h> |
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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/* This keeps a track of which one is crashing cpu. */ |
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static int crashing_cpu = -1; |
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static cpumask_t cpus_in_crash = CPU_MASK_NONE; |
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#ifdef CONFIG_SMP |
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static void crash_shutdown_secondary(void *passed_regs) |
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{ |
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struct pt_regs *regs = passed_regs; |
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int cpu = smp_processor_id(); |
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/* |
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* If we are passed registers, use those. Otherwise get the |
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* regs from the last interrupt, which should be correct, as |
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* we are in an interrupt. But if the regs are not there, |
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* pull them from the top of the stack. They are probably |
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* wrong, but we need something to keep from crashing again. |
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*/ |
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if (!regs) |
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regs = get_irq_regs(); |
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if (!regs) |
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regs = task_pt_regs(current); |
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if (!cpu_online(cpu)) |
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return; |
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/* We won't be sent IPIs any more. */ |
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set_cpu_online(cpu, false); |
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local_irq_disable(); |
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if (!cpumask_test_cpu(cpu, &cpus_in_crash)) |
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crash_save_cpu(regs, cpu); |
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cpumask_set_cpu(cpu, &cpus_in_crash); |
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while (!atomic_read(&kexec_ready_to_reboot)) |
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cpu_relax(); |
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kexec_reboot(); |
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/* NOTREACHED */ |
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} |
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static void crash_kexec_prepare_cpus(void) |
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{ |
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static int cpus_stopped; |
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unsigned int msecs; |
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unsigned int ncpus; |
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if (cpus_stopped) |
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return; |
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ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ |
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smp_call_function(crash_shutdown_secondary, NULL, 0); |
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smp_wmb(); |
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/* |
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* The crash CPU sends an IPI and wait for other CPUs to |
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* respond. Delay of at least 10 seconds. |
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*/ |
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pr_emerg("Sending IPI to other cpus...\n"); |
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msecs = 10000; |
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while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) { |
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cpu_relax(); |
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mdelay(1); |
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} |
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cpus_stopped = 1; |
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} |
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/* Override the weak function in kernel/panic.c */ |
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void crash_smp_send_stop(void) |
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{ |
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if (_crash_smp_send_stop) |
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_crash_smp_send_stop(); |
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crash_kexec_prepare_cpus(); |
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} |
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#else /* !defined(CONFIG_SMP) */ |
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static void crash_kexec_prepare_cpus(void) {} |
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#endif /* !defined(CONFIG_SMP) */ |
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void default_machine_crash_shutdown(struct pt_regs *regs) |
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{ |
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local_irq_disable(); |
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crashing_cpu = smp_processor_id(); |
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crash_save_cpu(regs, crashing_cpu); |
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crash_kexec_prepare_cpus(); |
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cpumask_set_cpu(crashing_cpu, &cpus_in_crash); |
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}
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