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11#include <linux/pci.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/pm.h>
15#include <linux/pm_runtime.h>
16#include <linux/init.h>
17#include <linux/pcieport_if.h>
18#include <linux/aer.h>
19#include <linux/dmi.h>
20#include <linux/pci-aspm.h>
21
22#include "portdrv.h"
23#include "aer/aerdrv.h"
24
25
26bool pcie_ports_disabled;
27
28
29
30
31
32bool pcie_ports_auto = true;
33
34static int __init pcie_port_setup(char *str)
35{
36 if (!strncmp(str, "compat", 6)) {
37 pcie_ports_disabled = true;
38 } else if (!strncmp(str, "native", 6)) {
39 pcie_ports_disabled = false;
40 pcie_ports_auto = false;
41 } else if (!strncmp(str, "auto", 4)) {
42 pcie_ports_disabled = false;
43 pcie_ports_auto = true;
44 }
45
46 return 1;
47}
48__setup("pcie_ports=", pcie_port_setup);
49
50
51
52
53
54
55
56void pcie_clear_root_pme_status(struct pci_dev *dev)
57{
58 pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
59}
60
61static int pcie_portdrv_restore_config(struct pci_dev *dev)
62{
63 int retval;
64
65 retval = pci_enable_device(dev);
66 if (retval)
67 return retval;
68 pci_set_master(dev);
69 return 0;
70}
71
72#ifdef CONFIG_PM
73static int pcie_port_resume_noirq(struct device *dev)
74{
75 struct pci_dev *pdev = to_pci_dev(dev);
76
77
78
79
80
81
82 if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
83 pcie_clear_root_pme_status(pdev);
84 return 0;
85}
86
87static int pcie_port_runtime_suspend(struct device *dev)
88{
89 return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
90}
91
92static int pcie_port_runtime_resume(struct device *dev)
93{
94 return 0;
95}
96
97static int pcie_port_runtime_idle(struct device *dev)
98{
99
100
101
102
103
104 return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
105}
106
107static const struct dev_pm_ops pcie_portdrv_pm_ops = {
108 .suspend = pcie_port_device_suspend,
109 .resume = pcie_port_device_resume,
110 .freeze = pcie_port_device_suspend,
111 .thaw = pcie_port_device_resume,
112 .poweroff = pcie_port_device_suspend,
113 .restore = pcie_port_device_resume,
114 .resume_noirq = pcie_port_resume_noirq,
115 .runtime_suspend = pcie_port_runtime_suspend,
116 .runtime_resume = pcie_port_runtime_resume,
117 .runtime_idle = pcie_port_runtime_idle,
118};
119
120#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
121
122#else
123
124#define PCIE_PORTDRV_PM_OPS NULL
125#endif
126
127
128
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132
133
134
135static int pcie_portdrv_probe(struct pci_dev *dev,
136 const struct pci_device_id *id)
137{
138 int status;
139
140 if (!pci_is_pcie(dev) ||
141 ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
142 (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
143 (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
144 return -ENODEV;
145
146 status = pcie_port_device_register(dev);
147 if (status)
148 return status;
149
150 pci_save_state(dev);
151
152
153
154
155
156
157
158
159
160 if (!dev->is_hotplug_bridge) {
161
162
163
164
165
166 pm_runtime_set_autosuspend_delay(&dev->dev, 100);
167 pm_runtime_use_autosuspend(&dev->dev);
168 pm_runtime_mark_last_busy(&dev->dev);
169 pm_runtime_put_autosuspend(&dev->dev);
170 pm_runtime_allow(&dev->dev);
171 }
172
173 return 0;
174}
175
176static void pcie_portdrv_remove(struct pci_dev *dev)
177{
178 if (!dev->is_hotplug_bridge) {
179 pm_runtime_forbid(&dev->dev);
180 pm_runtime_get_noresume(&dev->dev);
181 pm_runtime_dont_use_autosuspend(&dev->dev);
182 }
183
184 pcie_port_device_remove(dev);
185}
186
187static int error_detected_iter(struct device *device, void *data)
188{
189 struct pcie_device *pcie_device;
190 struct pcie_port_service_driver *driver;
191 struct aer_broadcast_data *result_data;
192 pci_ers_result_t status;
193
194 result_data = (struct aer_broadcast_data *) data;
195
196 if (device->bus == &pcie_port_bus_type && device->driver) {
197 driver = to_service_driver(device->driver);
198 if (!driver ||
199 !driver->err_handler ||
200 !driver->err_handler->error_detected)
201 return 0;
202
203 pcie_device = to_pcie_device(device);
204
205
206 status = driver->err_handler->error_detected(
207 pcie_device->port,
208 result_data->state);
209 result_data->result =
210 merge_result(result_data->result, status);
211 }
212
213 return 0;
214}
215
216static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
217 enum pci_channel_state error)
218{
219 struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
220
221
222 device_for_each_child(&dev->dev, &data, error_detected_iter);
223 return data.result;
224}
225
226static int mmio_enabled_iter(struct device *device, void *data)
227{
228 struct pcie_device *pcie_device;
229 struct pcie_port_service_driver *driver;
230 pci_ers_result_t status, *result;
231
232 result = (pci_ers_result_t *) data;
233
234 if (device->bus == &pcie_port_bus_type && device->driver) {
235 driver = to_service_driver(device->driver);
236 if (driver &&
237 driver->err_handler &&
238 driver->err_handler->mmio_enabled) {
239 pcie_device = to_pcie_device(device);
240
241
242 status = driver->err_handler->mmio_enabled(
243 pcie_device->port);
244 *result = merge_result(*result, status);
245 }
246 }
247
248 return 0;
249}
250
251static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
252{
253 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
254
255
256 device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
257 return status;
258}
259
260static int slot_reset_iter(struct device *device, void *data)
261{
262 struct pcie_device *pcie_device;
263 struct pcie_port_service_driver *driver;
264 pci_ers_result_t status, *result;
265
266 result = (pci_ers_result_t *) data;
267
268 if (device->bus == &pcie_port_bus_type && device->driver) {
269 driver = to_service_driver(device->driver);
270 if (driver &&
271 driver->err_handler &&
272 driver->err_handler->slot_reset) {
273 pcie_device = to_pcie_device(device);
274
275
276 status = driver->err_handler->slot_reset(
277 pcie_device->port);
278 *result = merge_result(*result, status);
279 }
280 }
281
282 return 0;
283}
284
285static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
286{
287 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
288
289
290 if (dev->error_state == pci_channel_io_frozen) {
291 dev->state_saved = true;
292 pci_restore_state(dev);
293 pcie_portdrv_restore_config(dev);
294 pci_enable_pcie_error_reporting(dev);
295 }
296
297
298 device_for_each_child(&dev->dev, &status, slot_reset_iter);
299 return status;
300}
301
302static int resume_iter(struct device *device, void *data)
303{
304 struct pcie_device *pcie_device;
305 struct pcie_port_service_driver *driver;
306
307 if (device->bus == &pcie_port_bus_type && device->driver) {
308 driver = to_service_driver(device->driver);
309 if (driver &&
310 driver->err_handler &&
311 driver->err_handler->resume) {
312 pcie_device = to_pcie_device(device);
313
314
315 driver->err_handler->resume(pcie_device->port);
316 }
317 }
318
319 return 0;
320}
321
322static void pcie_portdrv_err_resume(struct pci_dev *dev)
323{
324 device_for_each_child(&dev->dev, NULL, resume_iter);
325}
326
327
328
329
330static const struct pci_device_id port_pci_ids[] = { {
331
332 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
333 }, { }
334};
335
336static const struct pci_error_handlers pcie_portdrv_err_handler = {
337 .error_detected = pcie_portdrv_error_detected,
338 .mmio_enabled = pcie_portdrv_mmio_enabled,
339 .slot_reset = pcie_portdrv_slot_reset,
340 .resume = pcie_portdrv_err_resume,
341};
342
343static struct pci_driver pcie_portdriver = {
344 .name = "pcieport",
345 .id_table = &port_pci_ids[0],
346
347 .probe = pcie_portdrv_probe,
348 .remove = pcie_portdrv_remove,
349
350 .err_handler = &pcie_portdrv_err_handler,
351
352 .driver.pm = PCIE_PORTDRV_PM_OPS,
353};
354
355static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
356{
357 pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
358 d->ident);
359 pcie_pme_disable_msi();
360 return 0;
361}
362
363static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
364
365
366
367 {
368 .callback = dmi_pcie_pme_disable_msi,
369 .ident = "MSI Wind U-100",
370 .matches = {
371 DMI_MATCH(DMI_SYS_VENDOR,
372 "MICRO-STAR INTERNATIONAL CO., LTD"),
373 DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
374 },
375 },
376 {}
377};
378
379static int __init pcie_portdrv_init(void)
380{
381 int retval;
382
383 if (pcie_ports_disabled)
384 return pci_register_driver(&pcie_portdriver);
385
386 dmi_check_system(pcie_portdrv_dmi_table);
387
388 retval = pcie_port_bus_register();
389 if (retval) {
390 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
391 goto out;
392 }
393 retval = pci_register_driver(&pcie_portdriver);
394 if (retval)
395 pcie_port_bus_unregister();
396 out:
397 return retval;
398}
399device_initcall(pcie_portdrv_init);
400