kernel/drivers/pci/hotplug/shpchp_pci.c

   1 /*
   2  * Standard 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 "shpchp.h"
  36
  37 int shpchp_configure_device(struct slot *p_slot)
  38 {
  39         struct pci_dev *dev;
  40         struct controller *ctrl = p_slot->ctrl;
  41         struct pci_dev *bridge = ctrl->pci_dev;
  42         struct pci_bus *parent = bridge->subordinate;
  43         int num, ret = 0;
  44
  45         pci_lock_rescan_remove();
  46
  47         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
  48         if (dev) {
  49                 ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n",
  50                          pci_name(dev), pci_domain_nr(parent),
  51                          p_slot->bus, p_slot->device);
  52                 pci_dev_put(dev);
  53                 ret = -EINVAL;
  54                 goto out;
  55         }
  56
  57         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
  58         if (num == 0) {
  59                 ctrl_err(ctrl, "No new device found\n");
  60                 ret = -ENODEV;
  61                 goto out;
  62         }
  63
  64         list_for_each_entry(dev, &parent->devices, bus_list) {
  65                 if (PCI_SLOT(dev->devfn) != p_slot->device)
  66                         continue;
  67                 if (pci_is_bridge(dev))
  68                         pci_hp_add_bridge(dev);
  69         }
  70
  71         pci_assign_unassigned_bridge_resources(bridge);
  72         pcie_bus_configure_settings(parent);
  73         pci_bus_add_devices(parent);
  74
  75  out:
  76         pci_unlock_rescan_remove();
  77         return ret;
  78 }
  79
  80 int shpchp_unconfigure_device(struct slot *p_slot)
  81 {
  82         int rc = 0;
  83         u8 bctl = 0;
  84         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
  85         struct pci_dev *dev, *temp;
  86         struct controller *ctrl = p_slot->ctrl;
  87
  88         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
  89                  __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
  90
  91         pci_lock_rescan_remove();
  92
  93         list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
  94                 if (PCI_SLOT(dev->devfn) != p_slot->device)
  95                         continue;
  96
  97                 pci_dev_get(dev);
  98                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
  99                         pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
 100                         if (bctl & PCI_BRIDGE_CTL_VGA) {
 101                                 ctrl_err(ctrl,
 102                                          "Cannot remove display device %s\n",
 103                                          pci_name(dev));
 104                                 pci_dev_put(dev);
 105                                 rc = -EINVAL;
 106                                 break;
 107                         }
 108                 }
 109                 pci_stop_and_remove_bus_device(dev);
 110                 pci_dev_put(dev);
 111         }
 112
 113         pci_unlock_rescan_remove();
 114         return rc;
 115 }
 116