This patch includes scripts to create multiple yaml file for different
[kvmfornfv.git] / 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