1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Standard Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2003-2004 Intel Corporation
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/types.h>
19#include <linux/pci.h>
20#include "../pci.h"
21#include "shpchp.h"
22
23int shpchp_configure_device(struct slot *p_slot)
24{
25	struct pci_dev *dev;
26	struct controller *ctrl = p_slot->ctrl;
27	struct pci_dev *bridge = ctrl->pci_dev;
28	struct pci_bus *parent = bridge->subordinate;
29	int num, ret = 0;
30
31	pci_lock_rescan_remove();
32
33	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
34	if (dev) {
35		ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n",
36			 pci_name(dev), pci_domain_nr(parent),
37			 p_slot->bus, p_slot->device);
38		pci_dev_put(dev);
39		ret = -EINVAL;
40		goto out;
41	}
42
43	num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
44	if (num == 0) {
45		ctrl_err(ctrl, "No new device found\n");
46		ret = -ENODEV;
47		goto out;
48	}
49
50	for_each_pci_bridge(dev, parent) {
51		if (PCI_SLOT(dev->devfn) == p_slot->device)
52			pci_hp_add_bridge(dev);
53	}
54
55	pci_assign_unassigned_bridge_resources(bridge);
56	pcie_bus_configure_settings(parent);
57	pci_bus_add_devices(parent);
58
59 out:
60	pci_unlock_rescan_remove();
61	return ret;
62}
63
64void shpchp_unconfigure_device(struct slot *p_slot)
65{
66	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
67	struct pci_dev *dev, *temp;
68	struct controller *ctrl = p_slot->ctrl;
69
70	ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
71		 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
72
73	pci_lock_rescan_remove();
74
75	list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
76		if (PCI_SLOT(dev->devfn) != p_slot->device)
77			continue;
78
79		pci_dev_get(dev);
80		pci_stop_and_remove_bus_device(dev);
81		pci_dev_put(dev);
82	}
83
84	pci_unlock_rescan_remove();
85}
86