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6c2b374d ZY |
1 | /* |
2 | * drivers/pci/pcie/aer/aerdrv_core.c | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * This file implements the core part of PCI-Express AER. When an pci-express | |
9 | * error is delivered, an error message will be collected and printed to | |
10 | * console, then, an error recovery procedure will be executed by following | |
11 | * the pci error recovery rules. | |
12 | * | |
13 | * Copyright (C) 2006 Intel Corp. | |
14 | * Tom Long Nguyen (tom.l.nguyen@intel.com) | |
15 | * Zhang Yanmin (yanmin.zhang@intel.com) | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/pm.h> | |
24 | #include <linux/suspend.h> | |
6c2b374d ZY |
25 | #include <linux/delay.h> |
26 | #include "aerdrv.h" | |
27 | ||
28 | static int forceload; | |
29 | module_param(forceload, bool, 0); | |
30 | ||
6c2b374d ZY |
31 | int pci_enable_pcie_error_reporting(struct pci_dev *dev) |
32 | { | |
33 | u16 reg16 = 0; | |
34 | int pos; | |
35 | ||
270c66be | 36 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
37 | if (!pos) |
38 | return -EIO; | |
39 | ||
270c66be | 40 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
0927678f JB |
41 | if (!pos) |
42 | return -EIO; | |
43 | ||
6c2b374d ZY |
44 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); |
45 | reg16 = reg16 | | |
46 | PCI_EXP_DEVCTL_CERE | | |
47 | PCI_EXP_DEVCTL_NFERE | | |
48 | PCI_EXP_DEVCTL_FERE | | |
49 | PCI_EXP_DEVCTL_URRE; | |
50 | pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, | |
51 | reg16); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | int pci_disable_pcie_error_reporting(struct pci_dev *dev) | |
56 | { | |
57 | u16 reg16 = 0; | |
58 | int pos; | |
59 | ||
60 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
61 | if (!pos) | |
62 | return -EIO; | |
63 | ||
64 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); | |
65 | reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE | | |
66 | PCI_EXP_DEVCTL_NFERE | | |
67 | PCI_EXP_DEVCTL_FERE | | |
68 | PCI_EXP_DEVCTL_URRE); | |
69 | pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, | |
70 | reg16); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) | |
75 | { | |
76 | int pos; | |
77 | u32 status, mask; | |
78 | ||
0927678f | 79 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
80 | if (!pos) |
81 | return -EIO; | |
82 | ||
83 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); | |
84 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask); | |
85 | if (dev->error_state == pci_channel_io_normal) | |
86 | status &= ~mask; /* Clear corresponding nonfatal bits */ | |
87 | else | |
88 | status &= mask; /* Clear corresponding fatal bits */ | |
89 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
21c68474 | 94 | #if 0 |
f0dce411 SH |
95 | int pci_cleanup_aer_correct_error_status(struct pci_dev *dev) |
96 | { | |
97 | int pos; | |
98 | u32 status; | |
99 | ||
0927678f | 100 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
f0dce411 SH |
101 | if (!pos) |
102 | return -EIO; | |
103 | ||
104 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); | |
105 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status); | |
106 | ||
107 | return 0; | |
108 | } | |
21c68474 | 109 | #endif /* 0 */ |
f0dce411 | 110 | |
1f9f13c8 AP |
111 | |
112 | static void set_device_error_reporting(struct pci_dev *dev, void *data) | |
113 | { | |
114 | bool enable = *((bool *)data); | |
115 | ||
116 | if (dev->pcie_type != PCIE_RC_PORT && | |
117 | dev->pcie_type != PCIE_SW_UPSTREAM_PORT && | |
118 | dev->pcie_type != PCIE_SW_DOWNSTREAM_PORT) | |
119 | return; | |
120 | ||
121 | if (enable) | |
122 | pci_enable_pcie_error_reporting(dev); | |
123 | else | |
124 | pci_disable_pcie_error_reporting(dev); | |
125 | } | |
126 | ||
127 | /** | |
128 | * set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports. | |
129 | * @dev: pointer to root port's pci_dev data structure | |
130 | * @enable: true = enable error reporting, false = disable error reporting. | |
131 | */ | |
132 | static void set_downstream_devices_error_reporting(struct pci_dev *dev, | |
133 | bool enable) | |
134 | { | |
135 | set_device_error_reporting(dev, &enable); | |
cb4cb4ac AC |
136 | |
137 | if (!dev->subordinate) | |
138 | return; | |
1f9f13c8 AP |
139 | pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); |
140 | } | |
141 | ||
6c2b374d ZY |
142 | static int find_device_iter(struct device *device, void *data) |
143 | { | |
144 | struct pci_dev *dev; | |
145 | u16 id = *(unsigned long *)data; | |
146 | u8 secondary, subordinate, d_bus = id >> 8; | |
147 | ||
148 | if (device->bus == &pci_bus_type) { | |
149 | dev = to_pci_dev(device); | |
150 | if (id == ((dev->bus->number << 8) | dev->devfn)) { | |
151 | /* | |
152 | * Device ID match | |
153 | */ | |
154 | *(unsigned long*)data = (unsigned long)device; | |
155 | return 1; | |
156 | } | |
157 | ||
158 | /* | |
159 | * If device is P2P, check if it is an upstream? | |
160 | */ | |
161 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { | |
162 | pci_read_config_byte(dev, PCI_SECONDARY_BUS, | |
163 | &secondary); | |
164 | pci_read_config_byte(dev, PCI_SUBORDINATE_BUS, | |
165 | &subordinate); | |
166 | if (d_bus >= secondary && d_bus <= subordinate) { | |
167 | *(unsigned long*)data = (unsigned long)device; | |
168 | return 1; | |
169 | } | |
170 | } | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | /** | |
177 | * find_source_device - search through device hierarchy for source device | |
d885c6b7 | 178 | * @parent: pointer to Root Port pci_dev data structure |
6c2b374d ZY |
179 | * @id: device ID of agent who sends an error message to this Root Port |
180 | * | |
181 | * Invoked when error is detected at the Root Port. | |
d885c6b7 | 182 | */ |
6c2b374d ZY |
183 | static struct device* find_source_device(struct pci_dev *parent, u16 id) |
184 | { | |
185 | struct pci_dev *dev = parent; | |
186 | struct device *device; | |
187 | unsigned long device_addr; | |
188 | int status; | |
189 | ||
190 | /* Is Root Port an agent that sends error message? */ | |
191 | if (id == ((dev->bus->number << 8) | dev->devfn)) | |
192 | return &dev->dev; | |
193 | ||
194 | do { | |
195 | device_addr = id; | |
196 | if ((status = device_for_each_child(&dev->dev, | |
197 | &device_addr, find_device_iter))) { | |
198 | device = (struct device*)device_addr; | |
199 | dev = to_pci_dev(device); | |
200 | if (id == ((dev->bus->number << 8) | dev->devfn)) | |
201 | return device; | |
202 | } | |
203 | }while (status); | |
204 | ||
205 | return NULL; | |
206 | } | |
207 | ||
208 | static void report_error_detected(struct pci_dev *dev, void *data) | |
209 | { | |
210 | pci_ers_result_t vote; | |
211 | struct pci_error_handlers *err_handler; | |
212 | struct aer_broadcast_data *result_data; | |
213 | result_data = (struct aer_broadcast_data *) data; | |
214 | ||
215 | dev->error_state = result_data->state; | |
216 | ||
217 | if (!dev->driver || | |
218 | !dev->driver->err_handler || | |
219 | !dev->driver->err_handler->error_detected) { | |
220 | if (result_data->state == pci_channel_io_frozen && | |
221 | !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) { | |
222 | /* | |
223 | * In case of fatal recovery, if one of down- | |
224 | * stream device has no driver. We might be | |
225 | * unable to recover because a later insmod | |
226 | * of a driver for this device is unaware of | |
227 | * its hw state. | |
228 | */ | |
531f254e BH |
229 | dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n", |
230 | dev->driver ? | |
231 | "no AER-aware driver" : "no driver"); | |
6c2b374d ZY |
232 | } |
233 | return; | |
234 | } | |
235 | ||
236 | err_handler = dev->driver->err_handler; | |
237 | vote = err_handler->error_detected(dev, result_data->state); | |
238 | result_data->result = merge_result(result_data->result, vote); | |
239 | return; | |
240 | } | |
241 | ||
242 | static void report_mmio_enabled(struct pci_dev *dev, void *data) | |
243 | { | |
244 | pci_ers_result_t vote; | |
245 | struct pci_error_handlers *err_handler; | |
246 | struct aer_broadcast_data *result_data; | |
247 | result_data = (struct aer_broadcast_data *) data; | |
248 | ||
249 | if (!dev->driver || | |
250 | !dev->driver->err_handler || | |
251 | !dev->driver->err_handler->mmio_enabled) | |
252 | return; | |
253 | ||
254 | err_handler = dev->driver->err_handler; | |
255 | vote = err_handler->mmio_enabled(dev); | |
256 | result_data->result = merge_result(result_data->result, vote); | |
257 | return; | |
258 | } | |
259 | ||
260 | static void report_slot_reset(struct pci_dev *dev, void *data) | |
261 | { | |
262 | pci_ers_result_t vote; | |
263 | struct pci_error_handlers *err_handler; | |
264 | struct aer_broadcast_data *result_data; | |
265 | result_data = (struct aer_broadcast_data *) data; | |
266 | ||
267 | if (!dev->driver || | |
268 | !dev->driver->err_handler || | |
269 | !dev->driver->err_handler->slot_reset) | |
270 | return; | |
271 | ||
272 | err_handler = dev->driver->err_handler; | |
273 | vote = err_handler->slot_reset(dev); | |
274 | result_data->result = merge_result(result_data->result, vote); | |
275 | return; | |
276 | } | |
277 | ||
278 | static void report_resume(struct pci_dev *dev, void *data) | |
279 | { | |
280 | struct pci_error_handlers *err_handler; | |
281 | ||
282 | dev->error_state = pci_channel_io_normal; | |
283 | ||
284 | if (!dev->driver || | |
285 | !dev->driver->err_handler || | |
b0b801dd | 286 | !dev->driver->err_handler->resume) |
6c2b374d ZY |
287 | return; |
288 | ||
289 | err_handler = dev->driver->err_handler; | |
290 | err_handler->resume(dev); | |
291 | return; | |
292 | } | |
293 | ||
294 | /** | |
295 | * broadcast_error_message - handle message broadcast to downstream drivers | |
d885c6b7 | 296 | * @dev: pointer to from where in a hierarchy message is broadcasted down |
6c2b374d | 297 | * @state: error state |
d885c6b7 RD |
298 | * @error_mesg: message to print |
299 | * @cb: callback to be broadcasted | |
6c2b374d ZY |
300 | * |
301 | * Invoked during error recovery process. Once being invoked, the content | |
302 | * of error severity will be broadcasted to all downstream drivers in a | |
303 | * hierarchy in question. | |
d885c6b7 | 304 | */ |
6c2b374d ZY |
305 | static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, |
306 | enum pci_channel_state state, | |
307 | char *error_mesg, | |
308 | void (*cb)(struct pci_dev *, void *)) | |
309 | { | |
310 | struct aer_broadcast_data result_data; | |
311 | ||
531f254e | 312 | dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg); |
6c2b374d ZY |
313 | result_data.state = state; |
314 | if (cb == report_error_detected) | |
315 | result_data.result = PCI_ERS_RESULT_CAN_RECOVER; | |
316 | else | |
317 | result_data.result = PCI_ERS_RESULT_RECOVERED; | |
318 | ||
319 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { | |
320 | /* | |
321 | * If the error is reported by a bridge, we think this error | |
322 | * is related to the downstream link of the bridge, so we | |
323 | * do error recovery on all subordinates of the bridge instead | |
324 | * of the bridge and clear the error status of the bridge. | |
325 | */ | |
326 | if (cb == report_error_detected) | |
327 | dev->error_state = state; | |
328 | pci_walk_bus(dev->subordinate, cb, &result_data); | |
329 | if (cb == report_resume) { | |
330 | pci_cleanup_aer_uncorrect_error_status(dev); | |
331 | dev->error_state = pci_channel_io_normal; | |
332 | } | |
333 | } | |
334 | else { | |
335 | /* | |
336 | * If the error is reported by an end point, we think this | |
337 | * error is related to the upstream link of the end point. | |
338 | */ | |
339 | pci_walk_bus(dev->bus, cb, &result_data); | |
340 | } | |
341 | ||
342 | return result_data.result; | |
343 | } | |
344 | ||
345 | struct find_aer_service_data { | |
346 | struct pcie_port_service_driver *aer_driver; | |
347 | int is_downstream; | |
348 | }; | |
349 | ||
350 | static int find_aer_service_iter(struct device *device, void *data) | |
351 | { | |
352 | struct device_driver *driver; | |
353 | struct pcie_port_service_driver *service_driver; | |
6c2b374d ZY |
354 | struct find_aer_service_data *result; |
355 | ||
356 | result = (struct find_aer_service_data *) data; | |
357 | ||
358 | if (device->bus == &pcie_port_bus_type) { | |
22106368 RW |
359 | struct pcie_port_data *port_data; |
360 | ||
361 | port_data = pci_get_drvdata(to_pcie_device(device)->port); | |
362 | if (port_data->port_type == PCIE_SW_DOWNSTREAM_PORT) | |
6c2b374d ZY |
363 | result->is_downstream = 1; |
364 | ||
365 | driver = device->driver; | |
366 | if (driver) { | |
367 | service_driver = to_service_driver(driver); | |
22106368 | 368 | if (service_driver->service == PCIE_PORT_SERVICE_AER) { |
6c2b374d ZY |
369 | result->aer_driver = service_driver; |
370 | return 1; | |
371 | } | |
372 | } | |
373 | } | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | static void find_aer_service(struct pci_dev *dev, | |
379 | struct find_aer_service_data *data) | |
380 | { | |
b19441af GKH |
381 | int retval; |
382 | retval = device_for_each_child(&dev->dev, data, find_aer_service_iter); | |
6c2b374d ZY |
383 | } |
384 | ||
385 | static pci_ers_result_t reset_link(struct pcie_device *aerdev, | |
386 | struct pci_dev *dev) | |
387 | { | |
388 | struct pci_dev *udev; | |
389 | pci_ers_result_t status; | |
390 | struct find_aer_service_data data; | |
391 | ||
392 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) | |
393 | udev = dev; | |
394 | else | |
395 | udev= dev->bus->self; | |
396 | ||
397 | data.is_downstream = 0; | |
398 | data.aer_driver = NULL; | |
399 | find_aer_service(udev, &data); | |
400 | ||
401 | /* | |
402 | * Use the aer driver of the error agent firstly. | |
403 | * If it hasn't the aer driver, use the root port's | |
404 | */ | |
405 | if (!data.aer_driver || !data.aer_driver->reset_link) { | |
406 | if (data.is_downstream && | |
407 | aerdev->device.driver && | |
408 | to_service_driver(aerdev->device.driver)->reset_link) { | |
409 | data.aer_driver = | |
410 | to_service_driver(aerdev->device.driver); | |
411 | } else { | |
531f254e BH |
412 | dev_printk(KERN_DEBUG, &dev->dev, "no link-reset " |
413 | "support\n"); | |
6c2b374d ZY |
414 | return PCI_ERS_RESULT_DISCONNECT; |
415 | } | |
416 | } | |
417 | ||
418 | status = data.aer_driver->reset_link(udev); | |
419 | if (status != PCI_ERS_RESULT_RECOVERED) { | |
531f254e BH |
420 | dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream " |
421 | "device %s failed\n", pci_name(udev)); | |
6c2b374d ZY |
422 | return PCI_ERS_RESULT_DISCONNECT; |
423 | } | |
424 | ||
425 | return status; | |
426 | } | |
427 | ||
428 | /** | |
429 | * do_recovery - handle nonfatal/fatal error recovery process | |
430 | * @aerdev: pointer to a pcie_device data structure of root port | |
431 | * @dev: pointer to a pci_dev data structure of agent detecting an error | |
432 | * @severity: error severity type | |
433 | * | |
434 | * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast | |
435 | * error detected message to all downstream drivers within a hierarchy in | |
436 | * question and return the returned code. | |
d885c6b7 | 437 | */ |
6c2b374d ZY |
438 | static pci_ers_result_t do_recovery(struct pcie_device *aerdev, |
439 | struct pci_dev *dev, | |
440 | int severity) | |
441 | { | |
442 | pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED; | |
443 | enum pci_channel_state state; | |
444 | ||
445 | if (severity == AER_FATAL) | |
446 | state = pci_channel_io_frozen; | |
447 | else | |
448 | state = pci_channel_io_normal; | |
449 | ||
450 | status = broadcast_error_message(dev, | |
451 | state, | |
452 | "error_detected", | |
453 | report_error_detected); | |
454 | ||
455 | if (severity == AER_FATAL) { | |
456 | result = reset_link(aerdev, dev); | |
457 | if (result != PCI_ERS_RESULT_RECOVERED) { | |
458 | /* TODO: Should panic here? */ | |
459 | return result; | |
460 | } | |
461 | } | |
462 | ||
463 | if (status == PCI_ERS_RESULT_CAN_RECOVER) | |
464 | status = broadcast_error_message(dev, | |
465 | state, | |
466 | "mmio_enabled", | |
467 | report_mmio_enabled); | |
468 | ||
469 | if (status == PCI_ERS_RESULT_NEED_RESET) { | |
470 | /* | |
471 | * TODO: Should call platform-specific | |
472 | * functions to reset slot before calling | |
473 | * drivers' slot_reset callbacks? | |
474 | */ | |
475 | status = broadcast_error_message(dev, | |
476 | state, | |
477 | "slot_reset", | |
478 | report_slot_reset); | |
479 | } | |
480 | ||
481 | if (status == PCI_ERS_RESULT_RECOVERED) | |
482 | broadcast_error_message(dev, | |
483 | state, | |
484 | "resume", | |
485 | report_resume); | |
486 | ||
487 | return status; | |
488 | } | |
489 | ||
490 | /** | |
491 | * handle_error_source - handle logging error into an event log | |
492 | * @aerdev: pointer to pcie_device data structure of the root port | |
493 | * @dev: pointer to pci_dev data structure of error source device | |
494 | * @info: comprehensive error information | |
495 | * | |
496 | * Invoked when an error being detected by Root Port. | |
d885c6b7 | 497 | */ |
6c2b374d ZY |
498 | static void handle_error_source(struct pcie_device * aerdev, |
499 | struct pci_dev *dev, | |
500 | struct aer_err_info info) | |
501 | { | |
502 | pci_ers_result_t status = 0; | |
503 | int pos; | |
504 | ||
505 | if (info.severity == AER_CORRECTABLE) { | |
506 | /* | |
507 | * Correctable error does not need software intevention. | |
508 | * No need to go through error recovery process. | |
509 | */ | |
0927678f | 510 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
511 | if (pos) |
512 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
513 | info.status); | |
514 | } else { | |
515 | status = do_recovery(aerdev, dev, info.severity); | |
516 | if (status == PCI_ERS_RESULT_RECOVERED) { | |
531f254e BH |
517 | dev_printk(KERN_DEBUG, &dev->dev, "AER driver " |
518 | "successfully recovered\n"); | |
6c2b374d ZY |
519 | } else { |
520 | /* TODO: Should kernel panic here? */ | |
531f254e BH |
521 | dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't " |
522 | "recover\n"); | |
6c2b374d ZY |
523 | } |
524 | } | |
525 | } | |
526 | ||
527 | /** | |
528 | * aer_enable_rootport - enable Root Port's interrupts when receiving messages | |
529 | * @rpc: pointer to a Root Port data structure | |
530 | * | |
531 | * Invoked when PCIE bus loads AER service driver. | |
d885c6b7 | 532 | */ |
6c2b374d ZY |
533 | void aer_enable_rootport(struct aer_rpc *rpc) |
534 | { | |
535 | struct pci_dev *pdev = rpc->rpd->port; | |
536 | int pos, aer_pos; | |
537 | u16 reg16; | |
538 | u32 reg32; | |
539 | ||
540 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
541 | /* Clear PCIE Capability's Device Status */ | |
542 | pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, ®16); | |
543 | pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16); | |
544 | ||
545 | /* Disable system error generation in response to error messages */ | |
546 | pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, ®16); | |
547 | reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK); | |
548 | pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16); | |
549 | ||
0927678f | 550 | aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
551 | /* Clear error status */ |
552 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32); | |
553 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32); | |
554 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32); | |
555 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32); | |
556 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32); | |
557 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32); | |
558 | ||
1f9f13c8 AP |
559 | /* |
560 | * Enable error reporting for the root port device and downstream port | |
561 | * devices. | |
562 | */ | |
563 | set_downstream_devices_error_reporting(pdev, true); | |
6c2b374d ZY |
564 | |
565 | /* Enable Root Port's interrupt in response to error messages */ | |
566 | pci_write_config_dword(pdev, | |
567 | aer_pos + PCI_ERR_ROOT_COMMAND, | |
568 | ROOT_PORT_INTR_ON_MESG_MASK); | |
569 | } | |
570 | ||
571 | /** | |
572 | * disable_root_aer - disable Root Port's interrupts when receiving messages | |
573 | * @rpc: pointer to a Root Port data structure | |
574 | * | |
575 | * Invoked when PCIE bus unloads AER service driver. | |
d885c6b7 | 576 | */ |
6c2b374d ZY |
577 | static void disable_root_aer(struct aer_rpc *rpc) |
578 | { | |
579 | struct pci_dev *pdev = rpc->rpd->port; | |
580 | u32 reg32; | |
581 | int pos; | |
582 | ||
1f9f13c8 AP |
583 | /* |
584 | * Disable error reporting for the root port device and downstream port | |
585 | * devices. | |
586 | */ | |
587 | set_downstream_devices_error_reporting(pdev, false); | |
588 | ||
0927678f | 589 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
590 | /* Disable Root's interrupt in response to error messages */ |
591 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0); | |
592 | ||
593 | /* Clear Root's error status reg */ | |
594 | pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32); | |
595 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32); | |
596 | } | |
597 | ||
598 | /** | |
599 | * get_e_source - retrieve an error source | |
600 | * @rpc: pointer to the root port which holds an error | |
601 | * | |
602 | * Invoked by DPC handler to consume an error. | |
d885c6b7 | 603 | */ |
6c2b374d ZY |
604 | static struct aer_err_source* get_e_source(struct aer_rpc *rpc) |
605 | { | |
606 | struct aer_err_source *e_source; | |
607 | unsigned long flags; | |
608 | ||
609 | /* Lock access to Root error producer/consumer index */ | |
610 | spin_lock_irqsave(&rpc->e_lock, flags); | |
611 | if (rpc->prod_idx == rpc->cons_idx) { | |
612 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
613 | return NULL; | |
614 | } | |
615 | e_source = &rpc->e_sources[rpc->cons_idx]; | |
616 | rpc->cons_idx++; | |
617 | if (rpc->cons_idx == AER_ERROR_SOURCES_MAX) | |
618 | rpc->cons_idx = 0; | |
619 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
620 | ||
621 | return e_source; | |
622 | } | |
623 | ||
624 | static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) | |
625 | { | |
626 | int pos; | |
627 | ||
0927678f | 628 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
629 | |
630 | /* The device might not support AER */ | |
631 | if (!pos) | |
632 | return AER_SUCCESS; | |
633 | ||
634 | if (info->severity == AER_CORRECTABLE) { | |
635 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
636 | &info->status); | |
637 | if (!(info->status & ERR_CORRECTABLE_ERROR_MASK)) | |
638 | return AER_UNSUCCESS; | |
639 | } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE || | |
640 | info->severity == AER_NONFATAL) { | |
641 | ||
642 | /* Link is still healthy for IO reads */ | |
643 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, | |
644 | &info->status); | |
645 | if (!(info->status & ERR_UNCORRECTABLE_ERROR_MASK)) | |
646 | return AER_UNSUCCESS; | |
647 | ||
648 | if (info->status & AER_LOG_TLP_MASKS) { | |
649 | info->flags |= AER_TLP_HEADER_VALID_FLAG; | |
650 | pci_read_config_dword(dev, | |
651 | pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0); | |
652 | pci_read_config_dword(dev, | |
653 | pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1); | |
654 | pci_read_config_dword(dev, | |
655 | pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2); | |
656 | pci_read_config_dword(dev, | |
657 | pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3); | |
658 | } | |
659 | } | |
660 | ||
661 | return AER_SUCCESS; | |
662 | } | |
663 | ||
664 | /** | |
665 | * aer_isr_one_error - consume an error detected by root port | |
666 | * @p_device: pointer to error root port service device | |
667 | * @e_src: pointer to an error source | |
d885c6b7 | 668 | */ |
6c2b374d ZY |
669 | static void aer_isr_one_error(struct pcie_device *p_device, |
670 | struct aer_err_source *e_src) | |
671 | { | |
672 | struct device *s_device; | |
673 | struct aer_err_info e_info = {0, 0, 0,}; | |
674 | int i; | |
675 | u16 id; | |
676 | ||
677 | /* | |
678 | * There is a possibility that both correctable error and | |
679 | * uncorrectable error being logged. Report correctable error first. | |
680 | */ | |
681 | for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) { | |
682 | if (i > 4) | |
683 | break; | |
684 | if (!(e_src->status & i)) | |
685 | continue; | |
686 | ||
687 | /* Init comprehensive error information */ | |
688 | if (i & PCI_ERR_ROOT_COR_RCV) { | |
689 | id = ERR_COR_ID(e_src->id); | |
690 | e_info.severity = AER_CORRECTABLE; | |
691 | } else { | |
692 | id = ERR_UNCOR_ID(e_src->id); | |
693 | e_info.severity = ((e_src->status >> 6) & 1); | |
694 | } | |
695 | if (e_src->status & | |
696 | (PCI_ERR_ROOT_MULTI_COR_RCV | | |
697 | PCI_ERR_ROOT_MULTI_UNCOR_RCV)) | |
698 | e_info.flags |= AER_MULTI_ERROR_VALID_FLAG; | |
699 | if (!(s_device = find_source_device(p_device->port, id))) { | |
700 | printk(KERN_DEBUG "%s->can't find device of ID%04x\n", | |
66bef8c0 | 701 | __func__, id); |
6c2b374d ZY |
702 | continue; |
703 | } | |
704 | if (get_device_error_info(to_pci_dev(s_device), &e_info) == | |
705 | AER_SUCCESS) { | |
706 | aer_print_error(to_pci_dev(s_device), &e_info); | |
707 | handle_error_source(p_device, | |
708 | to_pci_dev(s_device), | |
709 | e_info); | |
710 | } | |
711 | } | |
712 | } | |
713 | ||
714 | /** | |
715 | * aer_isr - consume errors detected by root port | |
65f27f38 | 716 | * @work: definition of this work item |
6c2b374d ZY |
717 | * |
718 | * Invoked, as DPC, when root port records new detected error | |
d885c6b7 | 719 | */ |
65f27f38 | 720 | void aer_isr(struct work_struct *work) |
6c2b374d | 721 | { |
65f27f38 DH |
722 | struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler); |
723 | struct pcie_device *p_device = rpc->rpd; | |
6c2b374d ZY |
724 | struct aer_err_source *e_src; |
725 | ||
726 | mutex_lock(&rpc->rpc_mutex); | |
727 | e_src = get_e_source(rpc); | |
728 | while (e_src) { | |
729 | aer_isr_one_error(p_device, e_src); | |
730 | e_src = get_e_source(rpc); | |
731 | } | |
732 | mutex_unlock(&rpc->rpc_mutex); | |
733 | ||
734 | wake_up(&rpc->wait_release); | |
735 | } | |
736 | ||
737 | /** | |
738 | * aer_delete_rootport - disable root port aer and delete service data | |
739 | * @rpc: pointer to a root port device being deleted | |
740 | * | |
741 | * Invoked when AER service unloaded on a specific Root Port | |
d885c6b7 | 742 | */ |
6c2b374d ZY |
743 | void aer_delete_rootport(struct aer_rpc *rpc) |
744 | { | |
745 | /* Disable root port AER itself */ | |
746 | disable_root_aer(rpc); | |
747 | ||
748 | kfree(rpc); | |
749 | } | |
750 | ||
751 | /** | |
752 | * aer_init - provide AER initialization | |
753 | * @dev: pointer to AER pcie device | |
754 | * | |
755 | * Invoked when AER service driver is loaded. | |
d885c6b7 | 756 | */ |
6c2b374d ZY |
757 | int aer_init(struct pcie_device *dev) |
758 | { | |
8d29bfb7 ZY |
759 | if (aer_osc_setup(dev) && !forceload) |
760 | return -ENXIO; | |
6c2b374d ZY |
761 | |
762 | return AER_SUCCESS; | |
763 | } | |
764 | ||
6c2b374d ZY |
765 | EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting); |
766 | EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting); | |
767 | EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status); | |
768 |