This patch includes scripts to create multiple yaml file for different
[kvmfornfv.git] / kernel / drivers / pci / hotplug / pciehp_pci.c
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                 ctrl_err(ctrl, "Device %s already exists at %04x:%02x:00, cannot hot-add\n",
50                          pci_name(dev), pci_domain_nr(parent), parent->number);
51                 pci_dev_put(dev);
52                 ret = -EEXIST;
53                 goto out;
54         }
55
56         num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
57         if (num == 0) {
58                 ctrl_err(ctrl, "No new device found\n");
59                 ret = -ENODEV;
60                 goto out;
61         }
62
63         list_for_each_entry(dev, &parent->devices, bus_list)
64                 if (pci_is_bridge(dev))
65                         pci_hp_add_bridge(dev);
66
67         pci_assign_unassigned_bridge_resources(bridge);
68         pcie_bus_configure_settings(parent);
69         pci_bus_add_devices(parent);
70
71  out:
72         pci_unlock_rescan_remove();
73         return ret;
74 }
75
76 int pciehp_unconfigure_device(struct slot *p_slot)
77 {
78         int rc = 0;
79         u8 bctl = 0;
80         u8 presence = 0;
81         struct pci_dev *dev, *temp;
82         struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
83         u16 command;
84         struct controller *ctrl = p_slot->ctrl;
85
86         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
87                  __func__, pci_domain_nr(parent), parent->number);
88         pciehp_get_adapter_status(p_slot, &presence);
89
90         pci_lock_rescan_remove();
91
92         /*
93          * Stopping an SR-IOV PF device removes all the associated VFs,
94          * which will update the bus->devices list and confuse the
95          * iterator.  Therefore, iterate in reverse so we remove the VFs
96          * first, then the PF.  We do the same in pci_stop_bus_device().
97          */
98         list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
99                                          bus_list) {
100                 pci_dev_get(dev);
101                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
102                         pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
103                         if (bctl & PCI_BRIDGE_CTL_VGA) {
104                                 ctrl_err(ctrl,
105                                          "Cannot remove display device %s\n",
106                                          pci_name(dev));
107                                 pci_dev_put(dev);
108                                 rc = -EINVAL;
109                                 break;
110                         }
111                 }
112                 pci_stop_and_remove_bus_device(dev);
113                 /*
114                  * Ensure that no new Requests will be generated from
115                  * the device.
116                  */
117                 if (presence) {
118                         pci_read_config_word(dev, PCI_COMMAND, &command);
119                         command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
120                         command |= PCI_COMMAND_INTX_DISABLE;
121                         pci_write_config_word(dev, PCI_COMMAND, command);
122                 }
123                 pci_dev_put(dev);
124         }
125
126         pci_unlock_rescan_remove();
127         return rc;
128 }