[go: nahoru, domu]
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 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
76int 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}
129