/*
* Handle an IPI sent to this processor.
*/
intrmask_t
smp_handle_ipi(struct trapframe *frame)
{
cpumask_t cpumask; /* This cpu mask */
u_int ipi, ipi_bitmap;
ipi_bitmap = atomic_readandclear_int(PCPU_PTR(pending_ipis));
cpumask = PCPU_GET(cpumask);
CTR1(KTR_SMP, "smp_handle_ipi(), ipi_bitmap=%x", ipi_bitmap);
while (ipi_bitmap) {
/*
* Find the lowest set bit.
*/
ipi = ipi_bitmap & ~(ipi_bitmap - 1);
ipi_bitmap &= ~ipi;
switch (ipi) {
case IPI_INVLTLB:
CTR0(KTR_SMP, "IPI_INVLTLB");
break;
case IPI_RENDEZVOUS:
CTR0(KTR_SMP, "IPI_RENDEZVOUS");
smp_rendezvous_action();
break;
case IPI_AST:
CTR0(KTR_SMP, "IPI_AST");
break;
case IPI_STOP:
/*
* IPI_STOP_HARD is mapped to IPI_STOP so it is not
* necessary to add it in the switch.
*/
CTR0(KTR_SMP, "IPI_STOP or IPI_STOP_HARD");
atomic_set_int(&stopped_cpus, cpumask);
while ((started_cpus & cpumask) == 0)
;
atomic_clear_int(&started_cpus, cpumask);
atomic_clear_int(&stopped_cpus, cpumask);
break;
}
}
return CR_INT_IPI;
}
/*
* Reschedule call back. Nothing to do,
* all the work is done automatically when
* we return from the interrupt.
*/
static int
smp_reschedule_interrupt(void *unused)
{
int cpu = PCPU_GET(cpuid);
u_int ipi_bitmap;
ipi_bitmap = atomic_readandclear_int(&cpu_ipi_pending[cpu]);
if (ipi_bitmap & (1 << IPI_PREEMPT)) {
#ifdef COUNT_IPIS
(*ipi_preempt_counts[cpu])++;
#endif
sched_preempt(curthread);
}
if (ipi_bitmap & (1 << IPI_AST)) {
#ifdef COUNT_IPIS
(*ipi_ast_counts[cpu])++;
#endif
/* Nothing to do for AST */
}
return (FILTER_HANDLED);
}
