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7aa1c8f47e
[ralf@linux-mips.org: Original patch by Maxim Uvarov <muvarov@gmail.com> with plenty of further shining, polishing, debugging and testing by me.] Signed-off-by: Maxim Uvarov <muvarov@gmail.com> Cc: linux-mips@linux-mips.org Cc: kexec@lists.infradead.org Cc: horms@verge.net.au Patchwork: https://patchwork.linux-mips.org/patch/1025/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
#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/bootmem.h>
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#include <linux/crash_dump.h>
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#include <linux/delay.h>
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#include <linux/init.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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/* 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 *ignore)
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{
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struct pt_regs *regs;
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int cpu = smp_processor_id();
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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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local_irq_disable();
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if (!cpu_isset(cpu, cpus_in_crash))
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crash_save_cpu(regs, cpu);
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cpu_set(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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relocated_kexec_smp_wait(NULL);
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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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unsigned int msecs;
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unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
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dump_send_ipi(crash_shutdown_secondary);
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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 ((cpus_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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}
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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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cpu_set(crashing_cpu, cpus_in_crash);
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}
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