2 * PCI Express Hot Plug Controller Driver
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
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 (at
14 * your option) any later version.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/types.h>
33 #include <linux/pci.h>
37 int pciehp_configure_device(struct slot *p_slot)
40 struct pci_dev *bridge = p_slot->ctrl->pcie->port;
41 struct pci_bus *parent = bridge->subordinate;
43 struct controller *ctrl = p_slot->ctrl;
45 pci_lock_rescan_remove();
47 dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
50 * The device is already there. Either configured by the
51 * boot firmware or a previous hotplug event.
53 ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
54 pci_name(dev), pci_domain_nr(parent), parent->number);
60 num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
62 ctrl_err(ctrl, "No new device found\n");
67 for_each_pci_bridge(dev, parent)
68 pci_hp_add_bridge(dev);
70 pci_assign_unassigned_bridge_resources(bridge);
71 pcie_bus_configure_settings(parent);
72 pci_bus_add_devices(parent);
75 pci_unlock_rescan_remove();
79 int pciehp_unconfigure_device(struct slot *p_slot)
84 struct pci_dev *dev, *temp;
85 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
87 struct controller *ctrl = p_slot->ctrl;
89 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
90 __func__, pci_domain_nr(parent), parent->number);
91 pciehp_get_adapter_status(p_slot, &presence);
93 pci_lock_rescan_remove();
96 * Stopping an SR-IOV PF device removes all the associated VFs,
97 * which will update the bus->devices list and confuse the
98 * iterator. Therefore, iterate in reverse so we remove the VFs
99 * first, then the PF. We do the same in pci_stop_bus_device().
101 list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
104 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
105 pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
106 if (bctl & PCI_BRIDGE_CTL_VGA) {
108 "Cannot remove display device %s\n",
116 pci_dev_set_disconnected(dev, NULL);
117 if (pci_has_subordinate(dev))
118 pci_walk_bus(dev->subordinate,
119 pci_dev_set_disconnected, NULL);
121 pci_stop_and_remove_bus_device(dev);
123 * Ensure that no new Requests will be generated from
127 pci_read_config_word(dev, PCI_COMMAND, &command);
128 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
129 command |= PCI_COMMAND_INTX_DISABLE;
130 pci_write_config_word(dev, PCI_COMMAND, command);
135 pci_unlock_rescan_remove();