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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
|
/*
* File: portdrv_pci.c
* Purpose: PCI Express Port Bus Driver
*
* Copyright (C) 2004 Intel
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pcieport_if.h>
#include <linux/aer.h>
#include "portdrv.h"
#include "aer/aerdrv.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
#define DRIVER_DESC "PCIE Port Bus Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/* global data */
static const char device_name[] = "pcieport-driver";
static int pcie_portdrv_restore_config(struct pci_dev *dev)
{
int retval;
retval = pci_enable_device(dev);
if (retval)
return retval;
pci_set_master(dev);
return 0;
}
#ifdef CONFIG_PM
static struct dev_pm_ops pcie_portdrv_pm_ops = {
.suspend = pcie_port_device_suspend,
.resume = pcie_port_device_resume,
.freeze = pcie_port_device_suspend,
.thaw = pcie_port_device_resume,
.poweroff = pcie_port_device_suspend,
.restore = pcie_port_device_resume,
};
#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
#else /* !PM */
#define PCIE_PORTDRV_PM_OPS NULL
#endif /* !PM */
/*
* pcie_portdrv_probe - Probe PCI-Express port devices
* @dev: PCI-Express port device being probed
*
* If detected invokes the pcie_port_device_register() method for
* this port device.
*
*/
static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
const struct pci_device_id *id )
{
int status;
status = pcie_port_device_probe(dev);
if (status)
return status;
if (!dev->irq && dev->pin) {
dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
"check vendor BIOS\n", dev->vendor, dev->device);
}
status = pcie_port_device_register(dev);
if (status)
return status;
pci_save_state(dev);
return 0;
}
static void pcie_portdrv_remove (struct pci_dev *dev)
{
pcie_port_device_remove(dev);
pci_disable_device(dev);
}
static int error_detected_iter(struct device *device, void *data)
{
struct pcie_device *pcie_device;
struct pcie_port_service_driver *driver;
struct aer_broadcast_data *result_data;
pci_ers_result_t status;
result_data = (struct aer_broadcast_data *) data;
if (device->bus == &pcie_port_bus_type && device->driver) {
driver = to_service_driver(device->driver);
if (!driver ||
!driver->err_handler ||
!driver->err_handler->error_detected)
return 0;
pcie_device = to_pcie_device(device);
/* Forward error detected message to service drivers */
status = driver->err_handler->error_detected(
pcie_device->port,
result_data->state);
result_data->result =
merge_result(result_data->result, status);
}
return 0;
}
static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
enum pci_channel_state error)
{
struct aer_broadcast_data result_data =
{error, PCI_ERS_RESULT_CAN_RECOVER};
int retval;
/* can not fail */
retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
return result_data.result;
}
static int mmio_enabled_iter(struct device *device, void *data)
{
struct pcie_device *pcie_device;
struct pcie_port_service_driver *driver;
pci_ers_result_t status, *result;
result = (pci_ers_result_t *) data;
if (device->bus == &pcie_port_bus_type && device->driver) {
driver = to_service_driver(device->driver);
if (driver &&
driver->err_handler &&
driver->err_handler->mmio_enabled) {
pcie_device = to_pcie_device(device);
/* Forward error message to service drivers */
status = driver->err_handler->mmio_enabled(
pcie_device->port);
*result = merge_result(*result, status);
}
}
return 0;
}
static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
{
pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
int retval;
/* get true return value from &status */
retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
return status;
}
static int slot_reset_iter(struct device *device, void *data)
{
struct pcie_device *pcie_device;
struct pcie_port_service_driver *driver;
pci_ers_result_t status, *result;
result = (pci_ers_result_t *) data;
if (device->bus == &pcie_port_bus_type && device->driver) {
driver = to_service_driver(device->driver);
if (driver &&
driver->err_handler &&
driver->err_handler->slot_reset) {
pcie_device = to_pcie_device(device);
/* Forward error message to service drivers */
status = driver->err_handler->slot_reset(
pcie_device->port);
*result = merge_result(*result, status);
}
}
return 0;
}
static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
{
pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
int retval;
/* If fatal, restore cfg space for possible link reset at upstream */
if (dev->error_state == pci_channel_io_frozen) {
pci_restore_state(dev);
pcie_portdrv_restore_config(dev);
pci_enable_pcie_error_reporting(dev);
}
/* get true return value from &status */
retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
return status;
}
static int resume_iter(struct device *device, void *data)
{
struct pcie_device *pcie_device;
struct pcie_port_service_driver *driver;
if (device->bus == &pcie_port_bus_type && device->driver) {
driver = to_service_driver(device->driver);
if (driver &&
driver->err_handler &&
driver->err_handler->resume) {
pcie_device = to_pcie_device(device);
/* Forward error message to service drivers */
driver->err_handler->resume(pcie_device->port);
}
}
return 0;
}
static void pcie_portdrv_err_resume(struct pci_dev *dev)
{
int retval;
/* nothing to do with error value, if it ever happens */
retval = device_for_each_child(&dev->dev, NULL, resume_iter);
}
/*
* LINUX Device Driver Model
*/
static const struct pci_device_id port_pci_ids[] = { {
/* handle any PCI-Express port */
PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, port_pci_ids);
static struct pci_error_handlers pcie_portdrv_err_handler = {
.error_detected = pcie_portdrv_error_detected,
.mmio_enabled = pcie_portdrv_mmio_enabled,
.slot_reset = pcie_portdrv_slot_reset,
.resume = pcie_portdrv_err_resume,
};
static struct pci_driver pcie_portdriver = {
.name = (char *)device_name,
.id_table = &port_pci_ids[0],
.probe = pcie_portdrv_probe,
.remove = pcie_portdrv_remove,
.err_handler = &pcie_portdrv_err_handler,
.driver.pm = PCIE_PORTDRV_PM_OPS,
};
static int __init pcie_portdrv_init(void)
{
int retval;
retval = pcie_port_bus_register();
if (retval) {
printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
goto out;
}
retval = pci_register_driver(&pcie_portdriver);
if (retval)
pcie_port_bus_unregister();
out:
return retval;
}
static void __exit pcie_portdrv_exit(void)
{
pci_unregister_driver(&pcie_portdriver);
pcie_port_bus_unregister();
}
module_init(pcie_portdrv_init);
module_exit(pcie_portdrv_exit);
|
