/*
* Halt all other CPUs, calling the specified function on each of them
*
* This function can be used to halt all other CPUs on crash
* or emergency reboot time. The function passed as parameter
* will be called inside a NMI handler on all CPUs.
*/
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
{
unsigned long msecs;
local_irq_disable();
/* Make a note of crashing cpu. Will be used in NMI callback. */
crashing_cpu = safe_smp_processor_id();
shootdown_callback = callback;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
/* Would it be better to replace the trap vector here? */
if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
NMI_FLAG_FIRST, "crash"))
return; /* Return what? */
/*
* Ensure the new callback function is set before sending
* out the NMI
*/
wmb();
smp_send_nmi_allbutself();
msecs = 1000; /* Wait at most a second for the other cpus to stop */
while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
mdelay(1);
msecs--;
}
/* Leave the nmi callback set */
}
static void nmi_shootdown_cpus(void)
{
unsigned long msecs;
local_irq_disable();
crashing_cpu = smp_processor_id();
local_irq_count(crashing_cpu) = 0;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
/* Would it be better to replace the trap vector here? */
set_nmi_callback(crash_nmi_callback);
/* Ensure the new callback function is set before sending out the NMI. */
wmb();
smp_send_nmi_allbutself();
msecs = 1000; /* Wait at most a second for the other cpus to stop */
while ( (atomic_read(&waiting_for_crash_ipi) > 0) && msecs )
{
mdelay(1);
msecs--;
}
__stop_this_cpu();
disable_IO_APIC();
local_irq_enable();
}
static void nmi_shootdown_cpus(void)
{
unsigned long msecs;
local_irq_disable();
if ( hpet_broadcast_is_available() )
hpet_disable_legacy_broadcast();
crashing_cpu = smp_processor_id();
local_irq_count(crashing_cpu) = 0;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
/* Would it be better to replace the trap vector here? */
set_nmi_callback(crash_nmi_callback);
/* Ensure the new callback function is set before sending out the NMI. */
wmb();
smp_send_nmi_allbutself();
msecs = 1000; /* Wait at most a second for the other cpus to stop */
while ( (atomic_read(&waiting_for_crash_ipi) > 0) && msecs )
{
mdelay(1);
msecs--;
}
/* Crash shutdown any IOMMU functionality as the crashdump kernel is not
* happy when booting if interrupt/dma remapping is still enabled */
iommu_crash_shutdown();
__stop_this_cpu();
/* This is a bit of a hack due to the problems with the x2apic_enabled
* variable, but we can't do any better without a significant refactoring
* of the APIC code */
x2apic_enabled = (current_local_apic_mode() == APIC_MODE_X2APIC);
disable_IO_APIC();
hpet_disable();
}
static void nmi_shootdown_cpus(void)
{
unsigned long msecs;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
set_nmi_callback(crash_nmi_callback);
/*
* Ensure the new callback function is set before sending
* out the NMI
*/
wmb();
smp_send_nmi_allbutself();
msecs = 1000; /* Wait at most a second for the other cpus to stop */
while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
mdelay(1);
msecs--;
}
/* Leave the nmi callback set */
disable_local_APIC();
}
static void nmi_shootdown_cpus(void)
{
unsigned long msecs;
atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
/* Would it be better to replace the trap vector here? */
if (register_die_notifier(&crash_nmi_nb))
return; /* return what? */
/* Ensure the new callback function is set before sending
* out the NMI
*/
wmb();
smp_send_nmi_allbutself();
msecs = 1000; /* Wait at most a second for the other cpus to stop */
while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
mdelay(1);
msecs--;
}
/* Leave the nmi callback set */
disable_local_APIC();
}
