Beispiel #1
0
static void crash_kexec_prepare_cpus(int cpu)
{
    unsigned int msecs;

    unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */

    crash_send_ipi(crash_ipi_callback);
    smp_wmb();

    printk(KERN_EMERG "Sending IPI to other cpus...\n");
    msecs = 10000;
    while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
        cpu_relax();
        mdelay(1);
    }

    /* Would it be better to replace the trap vector here? */

    if (cpus_weight(cpus_in_crash) < ncpus) {
        printk(KERN_EMERG "done waiting: %d cpu(s) not responding\n",
               ncpus - cpus_weight(cpus_in_crash));
        printk(KERN_EMERG "Activate soft-reset to stop other cpu(s)\n");
        cpus_in_sr = CPU_MASK_NONE;
        atomic_set(&enter_on_soft_reset, 0);
        while (cpus_weight(cpus_in_crash) < ncpus)
            cpu_relax();
    }
    /*
     * Make sure all CPUs are entered via soft-reset if the kdump is
     * invoked using soft-reset.
     */
    if (cpu_isset(cpu, cpus_in_sr))
        crash_soft_reset_check(cpu);
    /* Leave the IPI callback set */
}
Beispiel #2
0
static void crash_kexec_prepare_cpus(int cpu)
{
	unsigned int msecs;

	unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */

	crash_send_ipi(crash_ipi_callback);
	smp_wmb();

	/*
	 * FIXME: Until we will have the way to stop other CPUSs reliabally,
	 * the crash CPU will send an IPI and wait for other CPUs to
	 * respond.
	 * Delay of at least 10 seconds.
	 */
	printk(KERN_EMERG "Sending IPI to other cpus...\n");
	msecs = 10000;
	while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
		cpu_relax();
		mdelay(1);
	}

	/* Would it be better to replace the trap vector here? */

	/*
	 * FIXME: In case if we do not get all CPUs, one possibility: ask the
	 * user to do soft reset such that we get all.
	 * Soft-reset will be used until better mechanism is implemented.
	 */
	if (cpus_weight(cpus_in_crash) < ncpus) {
		printk(KERN_EMERG "done waiting: %d cpu(s) not responding\n",
			ncpus - cpus_weight(cpus_in_crash));
		printk(KERN_EMERG "Activate soft-reset to stop other cpu(s)\n");
		cpus_in_sr = CPU_MASK_NONE;
		atomic_set(&enter_on_soft_reset, 0);
		while (cpus_weight(cpus_in_crash) < ncpus)
			cpu_relax();
	}
	/*
	 * Make sure all CPUs are entered via soft-reset if the kdump is
	 * invoked using soft-reset.
	 */
	if (cpu_isset(cpu, cpus_in_sr))
		crash_soft_reset_check(cpu);
	/* Leave the IPI callback set */
}
Beispiel #3
0
static void crash_kexec_prepare_cpus(int cpu)
{
	unsigned int msecs;
	unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
	int tries = 0;
	int (*old_handler)(struct pt_regs *regs);

	printk(KERN_EMERG "Sending IPI to other CPUs\n");

	crash_send_ipi(crash_ipi_callback);
	smp_wmb();

again:
	/*
	 * FIXME: Until we will have the way to stop other CPUs reliably,
	 * the crash CPU will send an IPI and wait for other CPUs to
	 * respond.
	 */
	msecs = IPI_TIMEOUT;
	while ((atomic_read(&cpus_in_crash) < ncpus) && (--msecs > 0))
		mdelay(1);

	/* Would it be better to replace the trap vector here? */

	if (atomic_read(&cpus_in_crash) >= ncpus) {
		printk(KERN_EMERG "IPI complete\n");
		return;
	}

	printk(KERN_EMERG "ERROR: %d cpu(s) not responding\n",
		ncpus - atomic_read(&cpus_in_crash));

	/*
	 * If we have a panic timeout set then we can't wait indefinitely
	 * for someone to activate system reset. We also give up on the
	 * second time through if system reset fail to work.
	 */
	if ((panic_timeout > 0) || (tries > 0))
		return;

	/*
	 * A system reset will cause all CPUs to take an 0x100 exception.
	 * The primary CPU returns here via setjmp, and the secondary
	 * CPUs reexecute the crash_kexec_secondary path.
	 */
	old_handler = __debugger;
	__debugger = handle_fault;
	crash_shutdown_cpu = smp_processor_id();

	if (setjmp(crash_shutdown_buf) == 0) {
		printk(KERN_EMERG "Activate system reset (dumprestart) "
				  "to stop other cpu(s)\n");

		/*
		 * A system reset will force all CPUs to execute the
		 * crash code again. We need to reset cpus_in_crash so we
		 * wait for everyone to do this.
		 */
		atomic_set(&cpus_in_crash, 0);
		smp_mb();

		while (atomic_read(&cpus_in_crash) < ncpus)
			cpu_relax();
	}

	crash_shutdown_cpu = -1;
	__debugger = old_handler;

	tries++;
	goto again;
}