Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * File: portdrv_pci.c | |
3 | * Purpose: PCI Express Port Bus Driver | |
4 | * | |
5 | * Copyright (C) 2004 Intel | |
6 | * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/pm.h> | |
71a83bd7 | 14 | #include <linux/pm_runtime.h> |
1da177e4 LT |
15 | #include <linux/init.h> |
16 | #include <linux/pcieport_if.h> | |
4bf3392e | 17 | #include <linux/aer.h> |
c39fae14 | 18 | #include <linux/dmi.h> |
28eb5f27 | 19 | #include <linux/pci-aspm.h> |
1da177e4 LT |
20 | |
21 | #include "portdrv.h" | |
4bf3392e | 22 | #include "aer/aerdrv.h" |
1da177e4 LT |
23 | |
24 | /* | |
25 | * Version Information | |
26 | */ | |
27 | #define DRIVER_VERSION "v1.0" | |
28 | #define DRIVER_AUTHOR "tom.l.nguyen@intel.com" | |
7e8af37a | 29 | #define DRIVER_DESC "PCIe Port Bus Driver" |
1da177e4 LT |
30 | MODULE_AUTHOR(DRIVER_AUTHOR); |
31 | MODULE_DESCRIPTION(DRIVER_DESC); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
79dd9182 RW |
34 | /* If this switch is set, PCIe port native services should not be enabled. */ |
35 | bool pcie_ports_disabled; | |
36 | ||
28eb5f27 RW |
37 | /* |
38 | * If this switch is set, ACPI _OSC will be used to determine whether or not to | |
39 | * enable PCIe port native services. | |
40 | */ | |
41 | bool pcie_ports_auto = true; | |
42 | ||
79dd9182 RW |
43 | static int __init pcie_port_setup(char *str) |
44 | { | |
28eb5f27 | 45 | if (!strncmp(str, "compat", 6)) { |
79dd9182 | 46 | pcie_ports_disabled = true; |
28eb5f27 RW |
47 | } else if (!strncmp(str, "native", 6)) { |
48 | pcie_ports_disabled = false; | |
49 | pcie_ports_auto = false; | |
50 | } else if (!strncmp(str, "auto", 4)) { | |
51 | pcie_ports_disabled = false; | |
52 | pcie_ports_auto = true; | |
53 | } | |
79dd9182 RW |
54 | |
55 | return 1; | |
56 | } | |
57 | __setup("pcie_ports=", pcie_port_setup); | |
58 | ||
1da177e4 | 59 | /* global data */ |
1da177e4 | 60 | |
fe31e697 RW |
61 | /** |
62 | * pcie_clear_root_pme_status - Clear root port PME interrupt status. | |
63 | * @dev: PCIe root port or event collector. | |
64 | */ | |
65 | void pcie_clear_root_pme_status(struct pci_dev *dev) | |
66 | { | |
2dcfaf85 | 67 | pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME); |
fe31e697 RW |
68 | } |
69 | ||
4bf3392e ZY |
70 | static int pcie_portdrv_restore_config(struct pci_dev *dev) |
71 | { | |
72 | int retval; | |
73 | ||
4bf3392e ZY |
74 | retval = pci_enable_device(dev); |
75 | if (retval) | |
76 | return retval; | |
77 | pci_set_master(dev); | |
78 | return 0; | |
79 | } | |
80 | ||
0bed208e | 81 | #ifdef CONFIG_PM |
fe31e697 RW |
82 | static int pcie_port_resume_noirq(struct device *dev) |
83 | { | |
84 | struct pci_dev *pdev = to_pci_dev(dev); | |
85 | ||
86 | /* | |
87 | * Some BIOSes forget to clear Root PME Status bits after system wakeup | |
88 | * which breaks ACPI-based runtime wakeup on PCI Express, so clear those | |
89 | * bits now just in case (shouldn't hurt). | |
90 | */ | |
62f87c0e | 91 | if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT) |
fe31e697 RW |
92 | pcie_clear_root_pme_status(pdev); |
93 | return 0; | |
94 | } | |
95 | ||
47145210 | 96 | static const struct dev_pm_ops pcie_portdrv_pm_ops = { |
3a3c244c RW |
97 | .suspend = pcie_port_device_suspend, |
98 | .resume = pcie_port_device_resume, | |
99 | .freeze = pcie_port_device_suspend, | |
100 | .thaw = pcie_port_device_resume, | |
101 | .poweroff = pcie_port_device_suspend, | |
102 | .restore = pcie_port_device_resume, | |
fe31e697 | 103 | .resume_noirq = pcie_port_resume_noirq, |
3a3c244c | 104 | }; |
4bf3392e | 105 | |
3a3c244c | 106 | #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) |
a79d682f | 107 | |
3a3c244c RW |
108 | #else /* !PM */ |
109 | ||
110 | #define PCIE_PORTDRV_PM_OPS NULL | |
111 | #endif /* !PM */ | |
4bf3392e | 112 | |
1da177e4 LT |
113 | /* |
114 | * pcie_portdrv_probe - Probe PCI-Express port devices | |
115 | * @dev: PCI-Express port device being probed | |
116 | * | |
40da4186 | 117 | * If detected invokes the pcie_port_device_register() method for |
1da177e4 LT |
118 | * this port device. |
119 | * | |
120 | */ | |
15856ad5 | 121 | static int pcie_portdrv_probe(struct pci_dev *dev, |
898294c9 | 122 | const struct pci_device_id *id) |
1da177e4 | 123 | { |
898294c9 | 124 | int status; |
1da177e4 | 125 | |
898294c9 | 126 | if (!pci_is_pcie(dev) || |
62f87c0e YW |
127 | ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) && |
128 | (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) && | |
129 | (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM))) | |
898294c9 | 130 | return -ENODEV; |
1da177e4 | 131 | |
f118c0c3 RW |
132 | status = pcie_port_device_register(dev); |
133 | if (status) | |
134 | return status; | |
1da177e4 | 135 | |
87d2e2ec | 136 | pci_save_state(dev); |
1da177e4 LT |
137 | return 0; |
138 | } | |
139 | ||
40da4186 | 140 | static void pcie_portdrv_remove(struct pci_dev *dev) |
1da177e4 LT |
141 | { |
142 | pcie_port_device_remove(dev); | |
143 | } | |
144 | ||
4bf3392e | 145 | static int error_detected_iter(struct device *device, void *data) |
60854838 | 146 | { |
4bf3392e ZY |
147 | struct pcie_device *pcie_device; |
148 | struct pcie_port_service_driver *driver; | |
149 | struct aer_broadcast_data *result_data; | |
150 | pci_ers_result_t status; | |
151 | ||
152 | result_data = (struct aer_broadcast_data *) data; | |
153 | ||
154 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
155 | driver = to_service_driver(device->driver); | |
156 | if (!driver || | |
157 | !driver->err_handler || | |
158 | !driver->err_handler->error_detected) | |
159 | return 0; | |
160 | ||
161 | pcie_device = to_pcie_device(device); | |
162 | ||
163 | /* Forward error detected message to service drivers */ | |
164 | status = driver->err_handler->error_detected( | |
165 | pcie_device->port, | |
166 | result_data->state); | |
167 | result_data->result = | |
168 | merge_result(result_data->result, status); | |
169 | } | |
170 | ||
171 | return 0; | |
60854838 HK |
172 | } |
173 | ||
4bf3392e ZY |
174 | static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev, |
175 | enum pci_channel_state error) | |
60854838 | 176 | { |
40da4186 | 177 | struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER}; |
4bf3392e | 178 | |
b638d7e7 BH |
179 | /* get true return value from &data */ |
180 | device_for_each_child(&dev->dev, &data, error_detected_iter); | |
40da4186 | 181 | return data.result; |
4bf3392e ZY |
182 | } |
183 | ||
184 | static int mmio_enabled_iter(struct device *device, void *data) | |
185 | { | |
186 | struct pcie_device *pcie_device; | |
187 | struct pcie_port_service_driver *driver; | |
188 | pci_ers_result_t status, *result; | |
189 | ||
190 | result = (pci_ers_result_t *) data; | |
191 | ||
192 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
193 | driver = to_service_driver(device->driver); | |
194 | if (driver && | |
195 | driver->err_handler && | |
196 | driver->err_handler->mmio_enabled) { | |
197 | pcie_device = to_pcie_device(device); | |
198 | ||
199 | /* Forward error message to service drivers */ | |
200 | status = driver->err_handler->mmio_enabled( | |
201 | pcie_device->port); | |
202 | *result = merge_result(*result, status); | |
203 | } | |
204 | } | |
60854838 | 205 | |
60854838 HK |
206 | return 0; |
207 | } | |
208 | ||
4bf3392e | 209 | static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev) |
1da177e4 | 210 | { |
4bf3392e | 211 | pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED; |
5823d100 | 212 | |
b19441af | 213 | /* get true return value from &status */ |
b638d7e7 | 214 | device_for_each_child(&dev->dev, &status, mmio_enabled_iter); |
4bf3392e | 215 | return status; |
1da177e4 LT |
216 | } |
217 | ||
4bf3392e | 218 | static int slot_reset_iter(struct device *device, void *data) |
1da177e4 | 219 | { |
4bf3392e ZY |
220 | struct pcie_device *pcie_device; |
221 | struct pcie_port_service_driver *driver; | |
222 | pci_ers_result_t status, *result; | |
223 | ||
224 | result = (pci_ers_result_t *) data; | |
225 | ||
226 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
227 | driver = to_service_driver(device->driver); | |
228 | if (driver && | |
229 | driver->err_handler && | |
230 | driver->err_handler->slot_reset) { | |
231 | pcie_device = to_pcie_device(device); | |
232 | ||
233 | /* Forward error message to service drivers */ | |
234 | status = driver->err_handler->slot_reset( | |
235 | pcie_device->port); | |
236 | *result = merge_result(*result, status); | |
237 | } | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev) | |
244 | { | |
029091df | 245 | pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED; |
4bf3392e ZY |
246 | |
247 | /* If fatal, restore cfg space for possible link reset at upstream */ | |
248 | if (dev->error_state == pci_channel_io_frozen) { | |
e9d82888 | 249 | dev->state_saved = true; |
a79d682f | 250 | pci_restore_state(dev); |
4bf3392e ZY |
251 | pcie_portdrv_restore_config(dev); |
252 | pci_enable_pcie_error_reporting(dev); | |
253 | } | |
254 | ||
b19441af | 255 | /* get true return value from &status */ |
b638d7e7 | 256 | device_for_each_child(&dev->dev, &status, slot_reset_iter); |
4bf3392e ZY |
257 | return status; |
258 | } | |
259 | ||
260 | static int resume_iter(struct device *device, void *data) | |
261 | { | |
262 | struct pcie_device *pcie_device; | |
263 | struct pcie_port_service_driver *driver; | |
264 | ||
265 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
266 | driver = to_service_driver(device->driver); | |
267 | if (driver && | |
268 | driver->err_handler && | |
269 | driver->err_handler->resume) { | |
270 | pcie_device = to_pcie_device(device); | |
271 | ||
272 | /* Forward error message to service drivers */ | |
273 | driver->err_handler->resume(pcie_device->port); | |
274 | } | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static void pcie_portdrv_err_resume(struct pci_dev *dev) | |
281 | { | |
b638d7e7 | 282 | device_for_each_child(&dev->dev, NULL, resume_iter); |
1da177e4 | 283 | } |
1da177e4 LT |
284 | |
285 | /* | |
286 | * LINUX Device Driver Model | |
287 | */ | |
288 | static const struct pci_device_id port_pci_ids[] = { { | |
289 | /* handle any PCI-Express port */ | |
290 | PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0), | |
291 | }, { /* end: all zeroes */ } | |
292 | }; | |
293 | MODULE_DEVICE_TABLE(pci, port_pci_ids); | |
294 | ||
49453028 SH |
295 | static const struct pci_error_handlers pcie_portdrv_err_handler = { |
296 | .error_detected = pcie_portdrv_error_detected, | |
297 | .mmio_enabled = pcie_portdrv_mmio_enabled, | |
298 | .slot_reset = pcie_portdrv_slot_reset, | |
299 | .resume = pcie_portdrv_err_resume, | |
4bf3392e ZY |
300 | }; |
301 | ||
3603a6a3 | 302 | static struct pci_driver pcie_portdriver = { |
e3fb20f9 | 303 | .name = "pcieport", |
1da177e4 LT |
304 | .id_table = &port_pci_ids[0], |
305 | ||
306 | .probe = pcie_portdrv_probe, | |
307 | .remove = pcie_portdrv_remove, | |
308 | ||
f7625980 | 309 | .err_handler = &pcie_portdrv_err_handler, |
3a3c244c | 310 | |
f7625980 | 311 | .driver.pm = PCIE_PORTDRV_PM_OPS, |
1da177e4 LT |
312 | }; |
313 | ||
c39fae14 RW |
314 | static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d) |
315 | { | |
316 | pr_notice("%s detected: will not use MSI for PCIe PME signaling\n", | |
227f0647 | 317 | d->ident); |
c39fae14 RW |
318 | pcie_pme_disable_msi(); |
319 | return 0; | |
320 | } | |
321 | ||
322 | static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = { | |
323 | /* | |
324 | * Boxes that should not use MSI for PCIe PME signaling. | |
325 | */ | |
326 | { | |
327 | .callback = dmi_pcie_pme_disable_msi, | |
328 | .ident = "MSI Wind U-100", | |
329 | .matches = { | |
330 | DMI_MATCH(DMI_SYS_VENDOR, | |
f7625980 | 331 | "MICRO-STAR INTERNATIONAL CO., LTD"), |
c39fae14 RW |
332 | DMI_MATCH(DMI_PRODUCT_NAME, "U-100"), |
333 | }, | |
334 | }, | |
335 | {} | |
336 | }; | |
337 | ||
1da177e4 LT |
338 | static int __init pcie_portdrv_init(void) |
339 | { | |
20d51660 | 340 | int retval; |
1da177e4 | 341 | |
fe31e697 RW |
342 | if (pcie_ports_disabled) |
343 | return pci_register_driver(&pcie_portdriver); | |
79dd9182 | 344 | |
c39fae14 RW |
345 | dmi_check_system(pcie_portdrv_dmi_table); |
346 | ||
20d51660 RD |
347 | retval = pcie_port_bus_register(); |
348 | if (retval) { | |
349 | printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval); | |
350 | goto out; | |
351 | } | |
3603a6a3 | 352 | retval = pci_register_driver(&pcie_portdriver); |
1da177e4 LT |
353 | if (retval) |
354 | pcie_port_bus_unregister(); | |
20d51660 | 355 | out: |
1da177e4 LT |
356 | return retval; |
357 | } | |
358 | ||
1da177e4 | 359 | module_init(pcie_portdrv_init); |