1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
// SPDX-License-Identifier: GPL-2.0+
/*
* PCI Express Hot Plug Controller Driver
*
* Copyright (C) 1995,2001 Compaq Computer Corporation
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001 IBM Corp.
* Copyright (C) 2003-2004 Intel Corporation
*
* All rights reserved.
*
* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
*
*/
#define dev_fmt(fmt) "pciehp: " fmt
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include "../pci.h"
#include "pciehp.h"
/**
* pciehp_configure_device() - enumerate PCI devices below a hotplug bridge
* @ctrl: PCIe hotplug controller
*
* Enumerate PCI devices below a hotplug bridge and add them to the system.
* Return 0 on success, %-EEXIST if the devices are already enumerated or
* %-ENODEV if enumeration failed.
*/
int pciehp_configure_device(struct controller *ctrl)
{
struct pci_dev *dev;
struct pci_dev *bridge = ctrl->pcie->port;
struct pci_bus *parent = bridge->subordinate;
int num, ret = 0;
pci_lock_rescan_remove();
dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
if (dev) {
/*
* The device is already there. Either configured by the
* boot firmware or a previous hotplug event.
*/
ctrl_dbg(ctrl, "Device %s already exists at %04x:%02x:00, skipping hot-add\n",
pci_name(dev), pci_domain_nr(parent), parent->number);
pci_dev_put(dev);
ret = -EEXIST;
goto out;
}
num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
if (num == 0) {
ctrl_err(ctrl, "No new device found\n");
ret = -ENODEV;
goto out;
}
for_each_pci_bridge(dev, parent)
pci_hp_add_bridge(dev);
pci_assign_unassigned_bridge_resources(bridge);
pcie_bus_configure_settings(parent);
/*
* Release reset_lock during driver binding
* to avoid AB-BA deadlock with device_lock.
*/
up_read(&ctrl->reset_lock);
pci_bus_add_devices(parent);
down_read_nested(&ctrl->reset_lock, ctrl->depth);
out:
pci_unlock_rescan_remove();
return ret;
}
/**
* pciehp_unconfigure_device() - remove PCI devices below a hotplug bridge
* @ctrl: PCIe hotplug controller
* @presence: whether the card is still present in the slot;
* true for safe removal via sysfs or an Attention Button press,
* false for surprise removal
*
* Unbind PCI devices below a hotplug bridge from their drivers and remove
* them from the system. Safely removed devices are quiesced. Surprise
* removed devices are marked as such to prevent further accesses.
*/
void pciehp_unconfigure_device(struct controller *ctrl, bool presence)
{
struct pci_dev *dev, *temp;
struct pci_bus *parent = ctrl->pcie->port->subordinate;
u16 command;
ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
__func__, pci_domain_nr(parent), parent->number);
if (!presence)
pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
pci_lock_rescan_remove();
/*
* Stopping an SR-IOV PF device removes all the associated VFs,
* which will update the bus->devices list and confuse the
* iterator. Therefore, iterate in reverse so we remove the VFs
* first, then the PF. We do the same in pci_stop_bus_device().
*/
list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
bus_list) {
pci_dev_get(dev);
/*
* Release reset_lock during driver unbinding
* to avoid AB-BA deadlock with device_lock.
*/
up_read(&ctrl->reset_lock);
pci_stop_and_remove_bus_device(dev);
down_read_nested(&ctrl->reset_lock, ctrl->depth);
/*
* Ensure that no new Requests will be generated from
* the device.
*/
if (presence) {
pci_read_config_word(dev, PCI_COMMAND, &command);
command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
command |= PCI_COMMAND_INTX_DISABLE;
pci_write_config_word(dev, PCI_COMMAND, command);
}
pci_dev_put(dev);
}
pci_unlock_rescan_remove();
}
|
