Function intr_setup_irq

freebsd/kern/subr_intr.c:1030–1095

}

int
intr_setup_irq(device_t dev, struct resource *res, driver_filter_t filt,
    driver_intr_t hand, void *arg, int flags, void **cookiep)
{
	int error;
	struct intr_map_data *data;
	struct intr_irqsrc *isrc;
	const char *name;
	u_int res_id;

	KASSERT(rman_get_start(res) == rman_get_end(res),
	    ("%s: more interrupts in resource", __func__));

	res_id = (u_int)rman_get_start(res);
	isrc = intr_map_get_isrc(res_id);
	if (isrc == NULL) {
		/* XXX TODO DISCONECTED PICs */
		return (EINVAL);
	}

	data = rman_get_virtual(res);
	name = device_get_nameunit(dev);

#ifdef INTR_SOLO
	/*
	 * Standard handling is done through MI interrupt framework. However,
	 * some interrupts could request solely own special handling. This
	 * non standard handling can be used for interrupt controllers without
	 * handler (filter only), so in case that interrupt controllers are
	 * chained, MI interrupt framework is called only in leaf controller.
	 *
	 * Note that root interrupt controller routine is served as well,
	 * however in intr_irq_handler(), i.e. main system dispatch routine.
	 */
	if (flags & INTR_SOLO && hand != NULL) {
		debugf("irq %u cannot solo on %s\n", irq, name);
		return (EINVAL);
	}

	if (flags & INTR_SOLO) {
		error = iscr_setup_filter(isrc, name, (intr_irq_filter_t *)filt,
		    arg, cookiep);
		debugf("irq %u setup filter error %d on %s\n", isrc->isrc_irq, error,
		    name);
	} else
#endif
		{
		error = isrc_add_handler(isrc, name, filt, hand, arg, flags,
		    cookiep);
		debugf("irq %u add handler error %d on %s\n", isrc->isrc_irq, error, name);
	}
	if (error != 0)
		return (error);

	mtx_lock(&isrc_table_lock);
	error = PIC_SETUP_INTR(isrc->isrc_dev, isrc, res, data);
	if (error == 0) {
		isrc->isrc_handlers++;