static int
nexus_xen_config_intr(device_t dev, int irq, enum intr_trigger trig,
enum intr_polarity pol)
{
int ret;
/*
* ISA and PCI intline IRQs are not preregistered on Xen, so
* intercept calls to configure those and register them on the fly.
*/
if ((irq < first_msi_irq) && (intr_lookup_source(irq) == NULL)) {
ret = xen_register_pirq(irq, trig, pol);
if (ret != 0)
return (ret);
nexus_add_irq(irq);
}
return (intr_config_intr(irq, trig, pol));
}
static void
msi_create_source(void)
{
struct msi_intsrc *msi;
u_int irq;
mtx_lock(&msi_lock);
if (msi_last_irq >= NUM_MSI_INTS) {
mtx_unlock(&msi_lock);
return;
}
irq = msi_last_irq + FIRST_MSI_INT;
msi_last_irq++;
mtx_unlock(&msi_lock);
msi = malloc(sizeof(struct msi_intsrc), M_MSI, M_WAITOK | M_ZERO);
msi->msi_intsrc.is_pic = &msi_pic;
msi->msi_irq = irq;
intr_register_source(&msi->msi_intsrc);
nexus_add_irq(irq);
}