void xics_kexec_teardown_cpu(int secondary)
{
xics_teardown_cpu();
icp_ops->flush_ipi();
if (secondary)
xics_set_cpu_giq(xics_default_distrib_server, 0);
}
void xics_kexec_teardown_cpu(int secondary)
{
xics_teardown_cpu();
icp_ops->flush_ipi();
/*
* Some machines need to have at least one cpu in the GIQ,
* so leave the master cpu in the group.
*/
if (secondary)
xics_set_cpu_giq(xics_default_distrib_server, 0);
}
/* Interrupts are disabled. */
void xics_migrate_irqs_away(void)
{
int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id();
unsigned int irq, virq;
/* If we used to be the default server, move to the new "boot_cpuid" */
if (hw_cpu == xics_default_server)
xics_update_irq_servers();
/* Reject any interrupt that was queued to us... */
icp_ops->set_priority(0);
/* Remove ourselves from the global interrupt queue */
xics_set_cpu_giq(xics_default_distrib_server, 0);
/* Allow IPIs again... */
icp_ops->set_priority(DEFAULT_PRIORITY);
for_each_irq(virq) {
struct irq_desc *desc;
struct irq_chip *chip;
long server;
unsigned long flags;
struct ics *ics;
/* We can't set affinity on ISA interrupts */
if (virq < NUM_ISA_INTERRUPTS)
continue;
desc = irq_to_desc(virq);
/* We only need to migrate enabled IRQS */
if (!desc || !desc->action)
continue;
if (desc->irq_data.domain != xics_host)
continue;
irq = desc->irq_data.hwirq;
/* We need to get IPIs still. */
if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
continue;
chip = irq_desc_get_chip(desc);
if (!chip || !chip->irq_set_affinity)
continue;
raw_spin_lock_irqsave(&desc->lock, flags);
/* Locate interrupt server */
server = -1;
ics = irq_get_chip_data(virq);
if (ics)
server = ics->get_server(ics, irq);
if (server < 0) {
printk(KERN_ERR "%s: Can't find server for irq %d\n",
__func__, irq);
goto unlock;
}
/* We only support delivery to all cpus or to one cpu.
* The irq has to be migrated only in the single cpu
* case.
*/
if (server != hw_cpu)
goto unlock;
/* This is expected during cpu offline. */
if (cpu_online(cpu))
pr_warning("IRQ %u affinity broken off cpu %u\n",
virq, cpu);
/* Reset affinity to all cpus */
raw_spin_unlock_irqrestore(&desc->lock, flags);
irq_set_affinity(virq, cpu_all_mask);
continue;
unlock:
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
}
void xics_setup_cpu(void)
{
icp_ops->set_priority(LOWEST_PRIORITY);
xics_set_cpu_giq(xics_default_distrib_server, 1);
}
void xics_migrate_irqs_away(void)
{
int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id();
unsigned int irq, virq;
struct irq_desc *desc;
if (hw_cpu == xics_default_server)
xics_update_irq_servers();
icp_ops->set_priority(0);
xics_set_cpu_giq(xics_default_distrib_server, 0);
icp_ops->set_priority(DEFAULT_PRIORITY);
for_each_irq_desc(virq, desc) {
struct irq_chip *chip;
long server;
unsigned long flags;
struct ics *ics;
if (virq < NUM_ISA_INTERRUPTS)
continue;
if (!desc->action)
continue;
if (desc->irq_data.domain != xics_host)
continue;
irq = desc->irq_data.hwirq;
if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS)
continue;
chip = irq_desc_get_chip(desc);
if (!chip || !chip->irq_set_affinity)
continue;
raw_spin_lock_irqsave(&desc->lock, flags);
server = -1;
ics = irq_get_chip_data(virq);
if (ics)
server = ics->get_server(ics, irq);
if (server < 0) {
printk(KERN_ERR "%s: Can't find server for irq %d\n",
__func__, irq);
goto unlock;
}
if (server != hw_cpu)
goto unlock;
if (cpu_online(cpu))
pr_warning("IRQ %u affinity broken off cpu %u\n",
virq, cpu);
raw_spin_unlock_irqrestore(&desc->lock, flags);
irq_set_affinity(virq, cpu_all_mask);
continue;
unlock:
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
}
