arch/powerpc/kernel/pci-hotplug.c

   1 /*
   2  * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c"
   3  *
   4  * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
   5  * Copyright (C) 2005 International Business Machines
   6  *
   7  * Updates, 2005, John Rose <johnrose@austin.ibm.com>
   8  * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
   9  * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <linux/pci.h>
  18 #include <linux/export.h>
  19 #include <asm/pci-bridge.h>
  20 #include <asm/ppc-pci.h>
  21 #include <asm/firmware.h>
  22 #include <asm/eeh.h>
  23
  24 /**
  25  * __pcibios_remove_pci_devices - remove all devices under this bus
  26  * @bus: the indicated PCI bus
  27  * @purge_pe: destroy the PE on removal of PCI devices
  28  *
  29  * Remove all of the PCI devices under this bus both from the
  30  * linux pci device tree, and from the powerpc EEH address cache.
  31  * By default, the corresponding PE will be destroied during the
  32  * normal PCI hotplug path. For PCI hotplug during EEH recovery,
  33  * the corresponding PE won't be destroied and deallocated.
  34  */
  35 void __pcibios_remove_pci_devices(struct pci_bus *bus, int purge_pe)
  36 {
  37         struct pci_dev *dev, *tmp;
  38         struct pci_bus *child_bus;
  39
  40         /* First go down child busses */
  41         list_for_each_entry(child_bus, &bus->children, node)
  42                 __pcibios_remove_pci_devices(child_bus, purge_pe);
  43
  44         pr_debug("PCI: Removing devices on bus %04x:%02x\n",
  45                  pci_domain_nr(bus),  bus->number);
  46         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
  47                 pr_debug("     * Removing %s...\n", pci_name(dev));
  48                 eeh_remove_bus_device(dev, purge_pe);
  49                 pci_stop_and_remove_bus_device(dev);
  50         }
  51 }
  52
  53 /**
  54  * pcibios_remove_pci_devices - remove all devices under this bus
  55  * @bus: the indicated PCI bus
  56  *
  57  * Remove all of the PCI devices under this bus both from the
  58  * linux pci device tree, and from the powerpc EEH address cache.
  59  */
  60 void pcibios_remove_pci_devices(struct pci_bus *bus)
  61 {
  62         __pcibios_remove_pci_devices(bus, 1);
  63 }
  64 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
  65
  66 /**
  67  * pcibios_add_pci_devices - adds new pci devices to bus
  68  * @bus: the indicated PCI bus
  69  *
  70  * This routine will find and fixup new pci devices under
  71  * the indicated bus. This routine presumes that there
  72  * might already be some devices under this bridge, so
  73  * it carefully tries to add only new devices.  (And that
  74  * is how this routine differs from other, similar pcibios
  75  * routines.)
  76  */
  77 void pcibios_add_pci_devices(struct pci_bus * bus)
  78 {
  79         int slotno, num, mode, pass, max;
  80         struct pci_dev *dev;
  81         struct device_node *dn = pci_bus_to_OF_node(bus);
  82
  83         eeh_add_device_tree_early(dn);
  84
  85         mode = PCI_PROBE_NORMAL;
  86         if (ppc_md.pci_probe_mode)
  87                 mode = ppc_md.pci_probe_mode(bus);
  88
  89         if (mode == PCI_PROBE_DEVTREE) {
  90                 /* use ofdt-based probe */
  91                 of_rescan_bus(dn, bus);
  92         } else if (mode == PCI_PROBE_NORMAL) {
  93                 /* use legacy probe */
  94                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
  95                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
  96                 if (!num)
  97                         return;
  98                 pcibios_setup_bus_devices(bus);
  99                 max = bus->busn_res.start;
 100                 for (pass = 0; pass < 2; pass++) {
 101                         list_for_each_entry(dev, &bus->devices, bus_list) {
 102                                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 103                                     dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 104                                         max = pci_scan_bridge(bus, dev,
 105                                                               max, pass);
 106                         }
 107                 }
 108         }
 109         pcibios_finish_adding_to_bus(bus);
 110 }
 111 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);