int plat_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
bool force)
{
cpumask_t tmask;
int cpu = 0;
void smtc_set_irq_affinity(unsigned int irq, cpumask_t aff);
/*
* On the legacy Malta development board, all I/O interrupts
* are routed through the 8259 and combined in a single signal
* to the CPU daughterboard, and on the CoreFPGA2/3 34K models,
* that signal is brought to IP2 of both VPEs. To avoid racing
* concurrent interrupt service events, IP2 is enabled only on
* one VPE, by convention VPE0. So long as no bits are ever
* cleared in the affinity mask, there will never be any
* interrupt forwarding. But as soon as a program or operator
* sets affinity for one of the related IRQs, we need to make
* sure that we don't ever try to forward across the VPE boundary,
* at least not until we engineer a system where the interrupt
* _ack() or _end() function can somehow know that it corresponds
* to an interrupt taken on another VPE, and perform the appropriate
* restoration of Status.IM state using MFTR/MTTR instead of the
* normal local behavior. We also ensure that no attempt will
* be made to forward to an offline "CPU".
*/
cpumask_copy(&tmask, affinity);
for_each_cpu(cpu, affinity) {
if ((cpu_data[cpu].vpe_id != 0) || !cpu_online(cpu))
cpu_clear(cpu, tmask);
}
cpumask_copy(d->affinity, &tmask);
if (cpus_empty(tmask))
/*
* We could restore a default mask here, but the
* runtime code can anyway deal with the null set
*/
printk(KERN_WARNING
"IRQ affinity leaves no legal CPU for IRQ %d\n", d->irq);
/* Do any generic SMTC IRQ affinity setup */
smtc_set_irq_affinity(d->irq, tmask);
return IRQ_SET_MASK_OK_NOCOPY;
}
int plat_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
bool force)
{
cpumask_t tmask;
int cpu = 0;
void smtc_set_irq_affinity(unsigned int irq, cpumask_t aff);
/*
*/
cpumask_copy(&tmask, affinity);
for_each_cpu(cpu, affinity) {
if ((cpu_data[cpu].vpe_id != 0) || !cpu_online(cpu))
cpu_clear(cpu, tmask);
}
cpumask_copy(d->affinity, &tmask);
if (cpus_empty(tmask))
/*
*/
printk(KERN_WARNING
"IRQ affinity leaves no legal CPU for IRQ %d\n", d->irq);
/* */
smtc_set_irq_affinity(d->irq, tmask);
return IRQ_SET_MASK_OK_NOCOPY;
}
