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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 | { | |
67 | int rtsta_pos; | |
68 | u32 rtsta; | |
69 | ||
70 | rtsta_pos = pci_pcie_cap(dev) + PCI_EXP_RTSTA; | |
71 | ||
72 | pci_read_config_dword(dev, rtsta_pos, &rtsta); | |
73 | rtsta |= PCI_EXP_RTSTA_PME; | |
74 | pci_write_config_dword(dev, rtsta_pos, rtsta); | |
75 | } | |
76 | ||
4bf3392e ZY |
77 | static int pcie_portdrv_restore_config(struct pci_dev *dev) |
78 | { | |
79 | int retval; | |
80 | ||
4bf3392e ZY |
81 | retval = pci_enable_device(dev); |
82 | if (retval) | |
83 | return retval; | |
84 | pci_set_master(dev); | |
85 | return 0; | |
86 | } | |
87 | ||
0bed208e | 88 | #ifdef CONFIG_PM |
fe31e697 RW |
89 | static int pcie_port_resume_noirq(struct device *dev) |
90 | { | |
91 | struct pci_dev *pdev = to_pci_dev(dev); | |
92 | ||
93 | /* | |
94 | * Some BIOSes forget to clear Root PME Status bits after system wakeup | |
95 | * which breaks ACPI-based runtime wakeup on PCI Express, so clear those | |
96 | * bits now just in case (shouldn't hurt). | |
97 | */ | |
62f87c0e | 98 | if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT) |
fe31e697 RW |
99 | pcie_clear_root_pme_status(pdev); |
100 | return 0; | |
101 | } | |
102 | ||
71a83bd7 | 103 | #ifdef CONFIG_PM_RUNTIME |
448bd857 HY |
104 | struct d3cold_info { |
105 | bool no_d3cold; | |
106 | unsigned int d3cold_delay; | |
107 | }; | |
108 | ||
109 | static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data) | |
110 | { | |
111 | struct d3cold_info *info = data; | |
112 | ||
113 | info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay, | |
114 | info->d3cold_delay); | |
115 | if (pdev->no_d3cold) | |
116 | info->no_d3cold = true; | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static int pcie_port_runtime_suspend(struct device *dev) | |
121 | { | |
122 | struct pci_dev *pdev = to_pci_dev(dev); | |
123 | struct d3cold_info d3cold_info = { | |
124 | .no_d3cold = false, | |
125 | .d3cold_delay = PCI_PM_D3_WAIT, | |
126 | }; | |
127 | ||
128 | /* | |
129 | * If any subordinate device disable D3cold, we should not put | |
130 | * the port into D3cold. The D3cold delay of port should be | |
131 | * the max of that of all subordinate devices. | |
132 | */ | |
133 | pci_walk_bus(pdev->subordinate, pci_dev_d3cold_info, &d3cold_info); | |
134 | pdev->no_d3cold = d3cold_info.no_d3cold; | |
135 | pdev->d3cold_delay = d3cold_info.d3cold_delay; | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static int pcie_port_runtime_resume(struct device *dev) | |
71a83bd7 ZY |
140 | { |
141 | return 0; | |
142 | } | |
143 | #else | |
448bd857 HY |
144 | #define pcie_port_runtime_suspend NULL |
145 | #define pcie_port_runtime_resume NULL | |
71a83bd7 ZY |
146 | #endif |
147 | ||
47145210 | 148 | static const struct dev_pm_ops pcie_portdrv_pm_ops = { |
3a3c244c RW |
149 | .suspend = pcie_port_device_suspend, |
150 | .resume = pcie_port_device_resume, | |
151 | .freeze = pcie_port_device_suspend, | |
152 | .thaw = pcie_port_device_resume, | |
153 | .poweroff = pcie_port_device_suspend, | |
154 | .restore = pcie_port_device_resume, | |
fe31e697 | 155 | .resume_noirq = pcie_port_resume_noirq, |
448bd857 HY |
156 | .runtime_suspend = pcie_port_runtime_suspend, |
157 | .runtime_resume = pcie_port_runtime_resume, | |
3a3c244c | 158 | }; |
4bf3392e | 159 | |
3a3c244c | 160 | #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) |
a79d682f | 161 | |
3a3c244c RW |
162 | #else /* !PM */ |
163 | ||
164 | #define PCIE_PORTDRV_PM_OPS NULL | |
165 | #endif /* !PM */ | |
4bf3392e | 166 | |
71a83bd7 ZY |
167 | /* |
168 | * PCIe port runtime suspend is broken for some chipsets, so use a | |
169 | * black list to disable runtime PM for these chipsets. | |
170 | */ | |
171 | static const struct pci_device_id port_runtime_pm_black_list[] = { | |
172 | { /* end: all zeroes */ } | |
173 | }; | |
174 | ||
1da177e4 LT |
175 | /* |
176 | * pcie_portdrv_probe - Probe PCI-Express port devices | |
177 | * @dev: PCI-Express port device being probed | |
178 | * | |
40da4186 | 179 | * If detected invokes the pcie_port_device_register() method for |
1da177e4 LT |
180 | * this port device. |
181 | * | |
182 | */ | |
898294c9 KK |
183 | static int __devinit pcie_portdrv_probe(struct pci_dev *dev, |
184 | const struct pci_device_id *id) | |
1da177e4 | 185 | { |
898294c9 | 186 | int status; |
1da177e4 | 187 | |
898294c9 | 188 | if (!pci_is_pcie(dev) || |
62f87c0e YW |
189 | ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) && |
190 | (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) && | |
191 | (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM))) | |
898294c9 | 192 | return -ENODEV; |
1da177e4 | 193 | |
40da4186 | 194 | if (!dev->irq && dev->pin) { |
34a2e15e | 195 | dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; " |
34438ba6 | 196 | "check vendor BIOS\n", dev->vendor, dev->device); |
1da177e4 | 197 | } |
f118c0c3 RW |
198 | status = pcie_port_device_register(dev); |
199 | if (status) | |
200 | return status; | |
1da177e4 | 201 | |
87d2e2ec | 202 | pci_save_state(dev); |
71a83bd7 ZY |
203 | if (!pci_match_id(port_runtime_pm_black_list, dev)) |
204 | pm_runtime_put_noidle(&dev->dev); | |
4bf3392e | 205 | |
1da177e4 LT |
206 | return 0; |
207 | } | |
208 | ||
40da4186 | 209 | static void pcie_portdrv_remove(struct pci_dev *dev) |
1da177e4 | 210 | { |
71a83bd7 ZY |
211 | if (!pci_match_id(port_runtime_pm_black_list, dev)) |
212 | pm_runtime_get_noresume(&dev->dev); | |
1da177e4 | 213 | pcie_port_device_remove(dev); |
d8998719 | 214 | pci_disable_device(dev); |
1da177e4 LT |
215 | } |
216 | ||
4bf3392e | 217 | static int error_detected_iter(struct device *device, void *data) |
60854838 | 218 | { |
4bf3392e ZY |
219 | struct pcie_device *pcie_device; |
220 | struct pcie_port_service_driver *driver; | |
221 | struct aer_broadcast_data *result_data; | |
222 | pci_ers_result_t status; | |
223 | ||
224 | result_data = (struct aer_broadcast_data *) 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->error_detected) | |
231 | return 0; | |
232 | ||
233 | pcie_device = to_pcie_device(device); | |
234 | ||
235 | /* Forward error detected message to service drivers */ | |
236 | status = driver->err_handler->error_detected( | |
237 | pcie_device->port, | |
238 | result_data->state); | |
239 | result_data->result = | |
240 | merge_result(result_data->result, status); | |
241 | } | |
242 | ||
243 | return 0; | |
60854838 HK |
244 | } |
245 | ||
4bf3392e ZY |
246 | static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev, |
247 | enum pci_channel_state error) | |
60854838 | 248 | { |
40da4186 HS |
249 | struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER}; |
250 | int ret; | |
4bf3392e | 251 | |
b19441af | 252 | /* can not fail */ |
40da4186 | 253 | ret = device_for_each_child(&dev->dev, &data, error_detected_iter); |
4bf3392e | 254 | |
40da4186 | 255 | return data.result; |
4bf3392e ZY |
256 | } |
257 | ||
258 | static int mmio_enabled_iter(struct device *device, void *data) | |
259 | { | |
260 | struct pcie_device *pcie_device; | |
261 | struct pcie_port_service_driver *driver; | |
262 | pci_ers_result_t status, *result; | |
263 | ||
264 | result = (pci_ers_result_t *) data; | |
265 | ||
266 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
267 | driver = to_service_driver(device->driver); | |
268 | if (driver && | |
269 | driver->err_handler && | |
270 | driver->err_handler->mmio_enabled) { | |
271 | pcie_device = to_pcie_device(device); | |
272 | ||
273 | /* Forward error message to service drivers */ | |
274 | status = driver->err_handler->mmio_enabled( | |
275 | pcie_device->port); | |
276 | *result = merge_result(*result, status); | |
277 | } | |
278 | } | |
60854838 | 279 | |
60854838 HK |
280 | return 0; |
281 | } | |
282 | ||
4bf3392e | 283 | static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev) |
1da177e4 | 284 | { |
4bf3392e | 285 | pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED; |
b19441af | 286 | int retval; |
5823d100 | 287 | |
b19441af GKH |
288 | /* get true return value from &status */ |
289 | retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter); | |
4bf3392e | 290 | return status; |
1da177e4 LT |
291 | } |
292 | ||
4bf3392e | 293 | static int slot_reset_iter(struct device *device, void *data) |
1da177e4 | 294 | { |
4bf3392e ZY |
295 | struct pcie_device *pcie_device; |
296 | struct pcie_port_service_driver *driver; | |
297 | pci_ers_result_t status, *result; | |
298 | ||
299 | result = (pci_ers_result_t *) data; | |
300 | ||
301 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
302 | driver = to_service_driver(device->driver); | |
303 | if (driver && | |
304 | driver->err_handler && | |
305 | driver->err_handler->slot_reset) { | |
306 | pcie_device = to_pcie_device(device); | |
307 | ||
308 | /* Forward error message to service drivers */ | |
309 | status = driver->err_handler->slot_reset( | |
310 | pcie_device->port); | |
311 | *result = merge_result(*result, status); | |
312 | } | |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev) | |
319 | { | |
029091df | 320 | pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED; |
b19441af | 321 | int retval; |
4bf3392e ZY |
322 | |
323 | /* If fatal, restore cfg space for possible link reset at upstream */ | |
324 | if (dev->error_state == pci_channel_io_frozen) { | |
e9d82888 | 325 | dev->state_saved = true; |
a79d682f | 326 | pci_restore_state(dev); |
4bf3392e ZY |
327 | pcie_portdrv_restore_config(dev); |
328 | pci_enable_pcie_error_reporting(dev); | |
329 | } | |
330 | ||
b19441af GKH |
331 | /* get true return value from &status */ |
332 | retval = device_for_each_child(&dev->dev, &status, slot_reset_iter); | |
4bf3392e ZY |
333 | |
334 | return status; | |
335 | } | |
336 | ||
337 | static int resume_iter(struct device *device, void *data) | |
338 | { | |
339 | struct pcie_device *pcie_device; | |
340 | struct pcie_port_service_driver *driver; | |
341 | ||
342 | if (device->bus == &pcie_port_bus_type && device->driver) { | |
343 | driver = to_service_driver(device->driver); | |
344 | if (driver && | |
345 | driver->err_handler && | |
346 | driver->err_handler->resume) { | |
347 | pcie_device = to_pcie_device(device); | |
348 | ||
349 | /* Forward error message to service drivers */ | |
350 | driver->err_handler->resume(pcie_device->port); | |
351 | } | |
352 | } | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static void pcie_portdrv_err_resume(struct pci_dev *dev) | |
358 | { | |
b19441af GKH |
359 | int retval; |
360 | /* nothing to do with error value, if it ever happens */ | |
361 | retval = device_for_each_child(&dev->dev, NULL, resume_iter); | |
1da177e4 | 362 | } |
1da177e4 LT |
363 | |
364 | /* | |
365 | * LINUX Device Driver Model | |
366 | */ | |
367 | static const struct pci_device_id port_pci_ids[] = { { | |
368 | /* handle any PCI-Express port */ | |
369 | PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0), | |
370 | }, { /* end: all zeroes */ } | |
371 | }; | |
372 | MODULE_DEVICE_TABLE(pci, port_pci_ids); | |
373 | ||
4bf3392e ZY |
374 | static struct pci_error_handlers pcie_portdrv_err_handler = { |
375 | .error_detected = pcie_portdrv_error_detected, | |
376 | .mmio_enabled = pcie_portdrv_mmio_enabled, | |
377 | .slot_reset = pcie_portdrv_slot_reset, | |
378 | .resume = pcie_portdrv_err_resume, | |
379 | }; | |
380 | ||
3603a6a3 | 381 | static struct pci_driver pcie_portdriver = { |
e3fb20f9 | 382 | .name = "pcieport", |
1da177e4 LT |
383 | .id_table = &port_pci_ids[0], |
384 | ||
385 | .probe = pcie_portdrv_probe, | |
386 | .remove = pcie_portdrv_remove, | |
387 | ||
4bf3392e | 388 | .err_handler = &pcie_portdrv_err_handler, |
3a3c244c RW |
389 | |
390 | .driver.pm = PCIE_PORTDRV_PM_OPS, | |
1da177e4 LT |
391 | }; |
392 | ||
c39fae14 RW |
393 | static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d) |
394 | { | |
395 | pr_notice("%s detected: will not use MSI for PCIe PME signaling\n", | |
396 | d->ident); | |
397 | pcie_pme_disable_msi(); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = { | |
402 | /* | |
403 | * Boxes that should not use MSI for PCIe PME signaling. | |
404 | */ | |
405 | { | |
406 | .callback = dmi_pcie_pme_disable_msi, | |
407 | .ident = "MSI Wind U-100", | |
408 | .matches = { | |
409 | DMI_MATCH(DMI_SYS_VENDOR, | |
410 | "MICRO-STAR INTERNATIONAL CO., LTD"), | |
411 | DMI_MATCH(DMI_PRODUCT_NAME, "U-100"), | |
412 | }, | |
413 | }, | |
414 | {} | |
415 | }; | |
416 | ||
1da177e4 LT |
417 | static int __init pcie_portdrv_init(void) |
418 | { | |
20d51660 | 419 | int retval; |
1da177e4 | 420 | |
fe31e697 RW |
421 | if (pcie_ports_disabled) |
422 | return pci_register_driver(&pcie_portdriver); | |
79dd9182 | 423 | |
c39fae14 RW |
424 | dmi_check_system(pcie_portdrv_dmi_table); |
425 | ||
20d51660 RD |
426 | retval = pcie_port_bus_register(); |
427 | if (retval) { | |
428 | printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval); | |
429 | goto out; | |
430 | } | |
3603a6a3 | 431 | retval = pci_register_driver(&pcie_portdriver); |
1da177e4 LT |
432 | if (retval) |
433 | pcie_port_bus_unregister(); | |
20d51660 | 434 | out: |
1da177e4 LT |
435 | return retval; |
436 | } | |
437 | ||
1da177e4 | 438 | module_init(pcie_portdrv_init); |