// SPDX-License-Identifier: GPL-2.0-or-later/* * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c" * * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> * Copyright (C) 2005 International Business Machines * * Updates, 2005, John Rose <johnrose@austin.ibm.com> * Updates, 2005, Linas Vepstas <linas@austin.ibm.com> * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com> */ #include <linux/pci.h>#include <linux/export.h>#include <linux/of.h>#include <asm/pci-bridge.h>#include <asm/ppc-pci.h>#include <asm/firmware.h>#include <asm/eeh.h> static struct pci_bus *find_bus_among_children(struct pci_bus *bus,					       struct device_node *dn){	struct pci_bus *child = NULL;	struct pci_bus *tmp; 	if (pci_bus_to_OF_node(bus) == dn)		return bus; 	list_for_each_entry(tmp, &bus->children, node) {		child = find_bus_among_children(tmp, dn);		if (child)			break;	} 	return child;} struct pci_bus *pci_find_bus_by_node(struct device_node *dn){	struct pci_dn *pdn = PCI_DN(dn); 	if (!pdn  || !pdn->phb || !pdn->phb->bus)		return NULL; 	return find_bus_among_children(pdn->phb->bus, dn);}EXPORT_SYMBOL_GPL(pci_find_bus_by_node); /** * pcibios_release_device - release PCI device * @dev: PCI device * * The function is called before releasing the indicated PCI device. */void pcibios_release_device(struct pci_dev *dev){	struct pci_controller *phb = pci_bus_to_host(dev->bus);	struct pci_dn *pdn = pci_get_pdn(dev); 	if (phb->controller_ops.release_device)		phb->controller_ops.release_device(dev); 	/* free()ing the pci_dn has been deferred to us, do it now */	if (pdn && (pdn->flags & PCI_DN_FLAG_DEAD)) {		pci_dbg(dev, "freeing dead pdn\n");		kfree(pdn);	}} /** * pci_hp_remove_devices - remove all devices under this bus * @bus: the indicated PCI bus * * Remove all of the PCI devices under this bus both from the * linux pci device tree, and from the powerpc EEH address cache. */void pci_hp_remove_devices(struct pci_bus *bus){	struct pci_dev *dev, *tmp;	struct pci_bus *child_bus; 	/* First go down child busses */	list_for_each_entry(child_bus, &bus->children, node)		pci_hp_remove_devices(child_bus); 	pr_debug("PCI: Removing devices on bus %04x:%02x\n",		 pci_domain_nr(bus),  bus->number);	list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {		pr_debug("   Removing %s...\n", pci_name(dev));		pci_stop_and_remove_bus_device(dev);	}}EXPORT_SYMBOL_GPL(pci_hp_remove_devices); static void traverse_siblings_and_scan_slot(struct device_node *start, struct pci_bus *bus){	struct device_node *dn;	int slotno; 	u32 class = 0; 	if (!of_property_read_u32(start->child, "class-code", &class)) {		/* Call of pci_scan_slot for non-bridge/EP case */		if (!((class >> 8) == PCI_CLASS_BRIDGE_PCI)) {			slotno = PCI_SLOT(PCI_DN(start->child)->devfn);			pci_scan_slot(bus, PCI_DEVFN(slotno, 0));			return;		}	} 	/* Iterate all siblings */	for_each_child_of_node(start, dn) {		class = 0; 		if (!of_property_read_u32(start->child, "class-code", &class)) {			/* Call of pci_scan_slot on each sibling-nodes/bridge-ports */			if ((class >> 8) == PCI_CLASS_BRIDGE_PCI) {				slotno = PCI_SLOT(PCI_DN(dn)->devfn);				pci_scan_slot(bus, PCI_DEVFN(slotno, 0));			}		}	}} /** * pci_hp_add_devices - adds new pci devices to bus * @bus: the indicated PCI bus * * This routine will find and fixup new pci devices under * the indicated bus. This routine presumes that there * might already be some devices under this bridge, so * it carefully tries to add only new devices.  (And that * is how this routine differs from other, similar pcibios * routines.) */void pci_hp_add_devices(struct pci_bus *bus){	int mode, max;	struct pci_dev *dev;	struct pci_controller *phb;	struct device_node *dn = pci_bus_to_OF_node(bus); 	if (!dn)		return; 	phb = pci_bus_to_host(bus); 	mode = PCI_PROBE_NORMAL;	if (phb->controller_ops.probe_mode)		mode = phb->controller_ops.probe_mode(bus); 	if (mode == PCI_PROBE_DEVTREE) {		/* use ofdt-based probe */		of_rescan_bus(dn, bus);	} else if (mode == PCI_PROBE_NORMAL &&		   dn->child && PCI_DN(dn->child)) {		/*		 * Use legacy probe. In the partial hotplug case, we		 * probably have grandchildren devices unplugged. So		 * we don't check the return value from pci_scan_slot() in		 * order for fully rescan all the way down to pick them up.		 * They can have been removed during partial hotplug.		 */		traverse_siblings_and_scan_slot(dn, bus);		max = bus->busn_res.start;		/*		 * Scan bridges that are already configured. We don't touch		 * them unless they are misconfigured (which will be done in		 * the second scan below).		 */		for_each_pci_bridge(dev, bus)			max = pci_scan_bridge(bus, dev, max, 0); 		/* Scan bridges that need to be reconfigured */		for_each_pci_bridge(dev, bus)			max = pci_scan_bridge(bus, dev, max, 1);	}	pcibios_finish_adding_to_bus(bus);}EXPORT_SYMBOL_GPL(pci_hp_add_devices);