1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Standard Hot Plug Controller Driver 4 * 5 * Copyright (C) 1995,2001 Compaq Computer Corporation 6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 7 * Copyright (C) 2001 IBM Corp. 8 * Copyright (C) 2003-2004 Intel Corporation 9 * 10 * All rights reserved. 11 * 12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/kernel.h> 18 #include <linux/types.h> 19 #include <linux/pci.h> 20 #include "../pci.h" 21 #include "shpchp.h" 22 23 int shpchp_configure_device(struct slot *p_slot) 24 { 25 struct pci_dev *dev; 26 struct controller *ctrl = p_slot->ctrl; 27 struct pci_dev *bridge = ctrl->pci_dev; 28 struct pci_bus *parent = bridge->subordinate; 29 int num, ret = 0; 30 31 pci_lock_rescan_remove(); 32 33 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0)); 34 if (dev) { 35 ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n", 36 pci_name(dev), pci_domain_nr(parent), 37 p_slot->bus, p_slot->device); 38 pci_dev_put(dev); 39 ret = -EINVAL; 40 goto out; 41 } 42 43 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); 44 if (num == 0) { 45 ctrl_err(ctrl, "No new device found\n"); 46 ret = -ENODEV; 47 goto out; 48 } 49 50 for_each_pci_bridge(dev, parent) { 51 if (PCI_SLOT(dev->devfn) == p_slot->device) 52 pci_hp_add_bridge(dev); 53 } 54 55 pci_assign_unassigned_bridge_resources(bridge); 56 pcie_bus_configure_settings(parent); 57 pci_bus_add_devices(parent); 58 59 out: 60 pci_unlock_rescan_remove(); 61 return ret; 62 } 63 64 void shpchp_unconfigure_device(struct slot *p_slot) 65 { 66 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; 67 struct pci_dev *dev, *temp; 68 struct controller *ctrl = p_slot->ctrl; 69 70 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n", 71 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device); 72 73 pci_lock_rescan_remove(); 74 75 list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) { 76 if (PCI_SLOT(dev->devfn) != p_slot->device) 77 continue; 78 79 pci_dev_get(dev); 80 pci_stop_and_remove_bus_device(dev); 81 pci_dev_put(dev); 82 } 83 84 pci_unlock_rescan_remove(); 85 } 86