pci: pci_host_generic: provide cleanup methods outside of detach

If device_attach() fails, we're expected to actually cleanup after
ourselves because device_detach() will not be called.  Factor out the
cleanup bits that don't rely on attach having actually succeeded so
that we can cleanup properly in bcm2838_pci.

Reviewed by:	andrew, imp
Differential Revision:	https://reviews.freebsd.org/D56896

sys/dev/pci/pci_host_generic.c

@@ -250,15 +250,22 @@ pci_host_generic_core_attach(device_t dev)
 int
 pci_host_generic_core_detach(device_t dev)
 {
-	struct generic_pcie_core_softc *sc;
-	int error, rid, tuple;
-
-	sc = device_get_softc(dev);
+	int error;
 
 	error = bus_generic_detach(dev);
 	if (error != 0)
 		return (error);
 
+	return (pci_host_generic_core_free(dev));
+}
+
+int
+pci_host_generic_core_free(device_t dev)
+{
+	struct generic_pcie_core_softc *sc;
+	int rid, tuple;
+
+	sc = device_get_softc(dev);
 	for (tuple = 0; tuple < MAX_RANGES_TUPLES; tuple++) {
 		rid = sc->ranges[tuple].rid;
 		if (sc->ranges[tuple].size == 0) {

sys/dev/pci/pci_host_generic.h

@@ -94,6 +94,7 @@ DECLARE_CLASS(generic_pcie_core_driver);
 
 int pci_host_generic_core_attach(device_t);
 int pci_host_generic_core_detach(device_t);
+int pci_host_generic_core_free(device_t);
 struct resource *pci_host_generic_core_alloc_resource(device_t, device_t, int,
     int, rman_res_t, rman_res_t, rman_res_t, u_int);
 int pci_host_generic_core_release_resource(device_t, device_t,

sys/dev/pci/pci_host_generic_fdt.c

@@ -104,6 +104,25 @@ generic_pcie_fdt_probe(device_t dev)
 	return (ENXIO);
 }
 
+void
+pci_host_generic_destroy_fdt(device_t dev)
+{
+	struct generic_pcie_fdt_softc *sc;
+	struct pci_ofw_devinfo *di;
+
+	sc = device_get_softc(dev);
+	while (!STAILQ_EMPTY(&sc->pci_ofw_devlist)) {
+		di = STAILQ_FIRST(&sc->pci_ofw_devlist);
+		STAILQ_REMOVE_HEAD(&sc->pci_ofw_devlist, pci_ofw_link);
+
+		ofw_bus_gen_destroy_devinfo(&di->di_dinfo);
+		free(di, M_DEVBUF);
+	}
+
+	ofw_bus_destroy_iinfo(&sc->pci_iinfo);
+	(void)pci_host_generic_core_free(dev);
+}
+
 int
 pci_host_generic_setup_fdt(device_t dev)
 {

sys/dev/pci/pci_host_generic_fdt.h

@@ -46,6 +46,7 @@ DECLARE_CLASS(generic_pcie_fdt_driver);
 struct resource *pci_host_generic_alloc_resource(device_t,
     device_t, int, int *, rman_res_t, rman_res_t, rman_res_t, u_int);
 int pci_host_generic_setup_fdt(device_t);
+void pci_host_generic_destroy_fdt(device_t);
 int pci_host_generic_fdt_attach(device_t);
 int generic_pcie_get_id(device_t, device_t, enum pci_id_type, uintptr_t *);