1 /* 2 * PCI Express Hot Plug Controller Driver 3 * 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 8 * 9 * All rights reserved. 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 (at 14 * your option) any later version. 15 * 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 20 * details. 21 * 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. 25 * 26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> 27 * 28 */ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/types.h> 33 #include <linux/pci.h> 34 #include "../pci.h" 35 #include "pciehp.h" 36 37 int pciehp_configure_device(struct slot *p_slot) 38 { 39 struct pci_dev *dev; 40 struct pci_dev *bridge = p_slot->ctrl->pcie->port; 41 struct pci_bus *parent = bridge->subordinate; 42 int num, ret = 0; 43 struct controller *ctrl = p_slot->ctrl; 44 45 pci_lock_rescan_remove(); 46 47 dev = pci_get_slot(parent, PCI_DEVFN(0, 0)); 48 if (dev) { 49 /* 50 * The device is already there. Either configured by the 51 * boot firmware or a previous hotplug event. 52 */ 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); 55 pci_dev_put(dev); 56 ret = -EEXIST; 57 goto out; 58 } 59 60 num = pci_scan_slot(parent, PCI_DEVFN(0, 0)); 61 if (num == 0) { 62 ctrl_err(ctrl, "No new device found\n"); 63 ret = -ENODEV; 64 goto out; 65 } 66 67 for_each_pci_bridge(dev, parent) 68 pci_hp_add_bridge(dev); 69 70 pci_assign_unassigned_bridge_resources(bridge); 71 pcie_bus_configure_settings(parent); 72 pci_bus_add_devices(parent); 73 74 out: 75 pci_unlock_rescan_remove(); 76 return ret; 77 } 78 79 int pciehp_unconfigure_device(struct slot *p_slot) 80 { 81 int rc = 0; 82 u8 bctl = 0; 83 u8 presence = 0; 84 struct pci_dev *dev, *temp; 85 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate; 86 u16 command; 87 struct controller *ctrl = p_slot->ctrl; 88 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); 92 93 pci_lock_rescan_remove(); 94 95 /* 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(). 100 */ 101 list_for_each_entry_safe_reverse(dev, temp, &parent->devices, 102 bus_list) { 103 pci_dev_get(dev); 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) { 107 ctrl_err(ctrl, 108 "Cannot remove display device %s\n", 109 pci_name(dev)); 110 pci_dev_put(dev); 111 rc = -EINVAL; 112 break; 113 } 114 } 115 if (!presence) { 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); 120 } 121 pci_stop_and_remove_bus_device(dev); 122 /* 123 * Ensure that no new Requests will be generated from 124 * the device. 125 */ 126 if (presence) { 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); 131 } 132 pci_dev_put(dev); 133 } 134 135 pci_unlock_rescan_remove(); 136 return rc; 137 } 138