kern/intr: enforce PPI interrupt for PPI requests

This should ensure devices needing a PPI interrupt receive a PPI
interrupt.

In debug kernels warn in case of mismatch between request and retrieved
intr_event.

Differential Revision: https://reviews.freebsd.org/D38448

Author: ehem

sys/kern/kern_intr.c

@@ -632,6 +632,19 @@ intr_event_add_handler(struct intr_event *ie, const char *name,
 	if (ie == NULL || name == NULL || (handler == NULL && filter == NULL))
 		return (EINVAL);
 
+	if ((flags & INTR_MULTIPROC) && !(ie->ie_flags & IE_MULTIPROC)) {
+#if defined(INVARIANTS) || defined(DEBUG)
+		printf("%s: Requested multi-processor interupt, but got "
+		    "uniprocessor interrupt\n", name);
+#endif
+		return (ENODEV);
+	}
+#if defined(INVARIANTS) || defined(DEBUG)
+	if (!(flags & INTR_MULTIPROC) && (ie->ie_flags & IE_MULTIPROC))
+		printf("%s: Requested uniprocessor interupt, but got "
+		    "multi-processor interrupt\n", name);
+#endif
+
 	/* Allocate and populate an interrupt handler structure. */
 	ih = malloc(sizeof(struct intr_handler), M_ITHREAD, M_WAITOK | M_ZERO);
 	ih->ih_filter = filter;