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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
37static int __ref pciehp_add_bridge(struct pci_dev *dev)
38{
39 struct pci_bus *parent = dev->bus;
40 int pass, busnr, start = parent->secondary;
41 int end = parent->subordinate;
42
43 for (busnr = start; busnr <= end; busnr++) {
44 if (!pci_find_bus(pci_domain_nr(parent), busnr))
45 break;
46 }
47 if (busnr-- > end) {
48 err("No bus number available for hot-added bridge %s\n",
49 pci_name(dev));
50 return -1;
51 }
52 for (pass = 0; pass < 2; pass++)
53 busnr = pci_scan_bridge(parent, dev, busnr, pass);
54 if (!dev->subordinate)
55 return -1;
56
57 return 0;
58}
59
60int pciehp_configure_device(struct slot *p_slot)
61{
62 struct pci_dev *dev;
63 struct pci_dev *bridge = p_slot->ctrl->pcie->port;
64 struct pci_bus *parent = bridge->subordinate;
65 int num, fn;
66 struct controller *ctrl = p_slot->ctrl;
67
68 dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
69 if (dev) {
70 ctrl_err(ctrl, "Device %s already exists "
71 "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
72 pci_domain_nr(parent), parent->number);
73 pci_dev_put(dev);
74 return -EINVAL;
75 }
76
77 num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
78 if (num == 0) {
79 ctrl_err(ctrl, "No new device found\n");
80 return -ENODEV;
81 }
82
83 for (fn = 0; fn < 8; fn++) {
84 dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
85 if (!dev)
86 continue;
87 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
88 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
89 pciehp_add_bridge(dev);
90 }
91 pci_dev_put(dev);
92 }
93
94 pci_assign_unassigned_bridge_resources(bridge);
95
96 for (fn = 0; fn < 8; fn++) {
97 dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
98 if (!dev)
99 continue;
100 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
101 pci_dev_put(dev);
102 continue;
103 }
104 pci_configure_slot(dev);
105 pci_dev_put(dev);
106 }
107
108 pci_bus_add_devices(parent);
109
110 return 0;
111}
112
113int pciehp_unconfigure_device(struct slot *p_slot)
114{
115 int ret, rc = 0;
116 int j;
117 u8 bctl = 0;
118 u8 presence = 0;
119 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
120 u16 command;
121 struct controller *ctrl = p_slot->ctrl;
122
123 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
124 __func__, pci_domain_nr(parent), parent->number);
125 ret = pciehp_get_adapter_status(p_slot, &presence);
126 if (ret)
127 presence = 0;
128
129 for (j = 0; j < 8; j++) {
130 struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j));
131 if (!temp)
132 continue;
133 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
134 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
135 if (bctl & PCI_BRIDGE_CTL_VGA) {
136 ctrl_err(ctrl,
137 "Cannot remove display device %s\n",
138 pci_name(temp));
139 pci_dev_put(temp);
140 rc = -EINVAL;
141 break;
142 }
143 }
144 pci_remove_bus_device(temp);
145 /*
146 * Ensure that no new Requests will be generated from
147 * the device.
148 */
149 if (presence) {
150 pci_read_config_word(temp, PCI_COMMAND, &command);
151 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
152 command |= PCI_COMMAND_INTX_DISABLE;
153 pci_write_config_word(temp, PCI_COMMAND, command);
154 }
155 pci_dev_put(temp);
156 }
157
158 return rc;
159}
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
37int 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 "
50 "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
51 pci_domain_nr(parent), parent->number);
52 pci_dev_put(dev);
53 ret = -EEXIST;
54 goto out;
55 }
56
57 num = pci_scan_slot(parent, PCI_DEVFN(0, 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 ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
66 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
67 pci_hp_add_bridge(dev);
68
69 pci_assign_unassigned_bridge_resources(bridge);
70
71 list_for_each_entry(dev, &parent->devices, bus_list) {
72 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
73 continue;
74
75 pci_configure_slot(dev);
76 }
77
78 pci_bus_add_devices(parent);
79
80 out:
81 pci_unlock_rescan_remove();
82 return ret;
83}
84
85int pciehp_unconfigure_device(struct slot *p_slot)
86{
87 int rc = 0;
88 u8 bctl = 0;
89 u8 presence = 0;
90 struct pci_dev *dev, *temp;
91 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
92 u16 command;
93 struct controller *ctrl = p_slot->ctrl;
94
95 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
96 __func__, pci_domain_nr(parent), parent->number);
97 pciehp_get_adapter_status(p_slot, &presence);
98
99 pci_lock_rescan_remove();
100
101 /*
102 * Stopping an SR-IOV PF device removes all the associated VFs,
103 * which will update the bus->devices list and confuse the
104 * iterator. Therefore, iterate in reverse so we remove the VFs
105 * first, then the PF. We do the same in pci_stop_bus_device().
106 */
107 list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
108 bus_list) {
109 pci_dev_get(dev);
110 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
111 pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
112 if (bctl & PCI_BRIDGE_CTL_VGA) {
113 ctrl_err(ctrl,
114 "Cannot remove display device %s\n",
115 pci_name(dev));
116 pci_dev_put(dev);
117 rc = -EINVAL;
118 break;
119 }
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}