Commit | Line | Data |
---|---|---|
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; | |
28eb27cf | 29 | static int nosourceid; |
6c2b374d | 30 | module_param(forceload, bool, 0); |
28eb27cf | 31 | module_param(nosourceid, bool, 0); |
6c2b374d | 32 | |
6c2b374d ZY |
33 | int pci_enable_pcie_error_reporting(struct pci_dev *dev) |
34 | { | |
35 | u16 reg16 = 0; | |
36 | int pos; | |
37 | ||
270c66be | 38 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
39 | if (!pos) |
40 | return -EIO; | |
41 | ||
270c66be | 42 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); |
0927678f JB |
43 | if (!pos) |
44 | return -EIO; | |
45 | ||
6c2b374d ZY |
46 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); |
47 | reg16 = reg16 | | |
48 | PCI_EXP_DEVCTL_CERE | | |
49 | PCI_EXP_DEVCTL_NFERE | | |
50 | PCI_EXP_DEVCTL_FERE | | |
51 | PCI_EXP_DEVCTL_URRE; | |
c9a91883 HS |
52 | pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16); |
53 | ||
6c2b374d ZY |
54 | return 0; |
55 | } | |
c9a91883 | 56 | EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting); |
6c2b374d ZY |
57 | |
58 | int pci_disable_pcie_error_reporting(struct pci_dev *dev) | |
59 | { | |
60 | u16 reg16 = 0; | |
61 | int pos; | |
62 | ||
63 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
64 | if (!pos) | |
65 | return -EIO; | |
66 | ||
67 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); | |
68 | reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE | | |
69 | PCI_EXP_DEVCTL_NFERE | | |
70 | PCI_EXP_DEVCTL_FERE | | |
71 | PCI_EXP_DEVCTL_URRE); | |
c9a91883 HS |
72 | pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16); |
73 | ||
6c2b374d ZY |
74 | return 0; |
75 | } | |
c9a91883 | 76 | EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting); |
6c2b374d ZY |
77 | |
78 | int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) | |
79 | { | |
80 | int pos; | |
81 | u32 status, mask; | |
82 | ||
0927678f | 83 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
84 | if (!pos) |
85 | return -EIO; | |
86 | ||
87 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); | |
88 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask); | |
89 | if (dev->error_state == pci_channel_io_normal) | |
90 | status &= ~mask; /* Clear corresponding nonfatal bits */ | |
91 | else | |
92 | status &= mask; /* Clear corresponding fatal bits */ | |
93 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); | |
94 | ||
95 | return 0; | |
96 | } | |
c9a91883 | 97 | EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status); |
6c2b374d | 98 | |
21c68474 | 99 | #if 0 |
f0dce411 SH |
100 | int pci_cleanup_aer_correct_error_status(struct pci_dev *dev) |
101 | { | |
102 | int pos; | |
103 | u32 status; | |
104 | ||
0927678f | 105 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
f0dce411 SH |
106 | if (!pos) |
107 | return -EIO; | |
108 | ||
109 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); | |
110 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status); | |
111 | ||
112 | return 0; | |
113 | } | |
21c68474 | 114 | #endif /* 0 */ |
f0dce411 | 115 | |
70298c6e | 116 | static int set_device_error_reporting(struct pci_dev *dev, void *data) |
1f9f13c8 AP |
117 | { |
118 | bool enable = *((bool *)data); | |
119 | ||
43c16408 AP |
120 | if (dev->pcie_type == PCIE_RC_PORT || |
121 | dev->pcie_type == PCIE_SW_UPSTREAM_PORT || | |
122 | dev->pcie_type == PCIE_SW_DOWNSTREAM_PORT) { | |
123 | if (enable) | |
124 | pci_enable_pcie_error_reporting(dev); | |
125 | else | |
126 | pci_disable_pcie_error_reporting(dev); | |
127 | } | |
1f9f13c8 AP |
128 | |
129 | if (enable) | |
43c16408 | 130 | pcie_set_ecrc_checking(dev); |
70298c6e ZY |
131 | |
132 | return 0; | |
1f9f13c8 AP |
133 | } |
134 | ||
135 | /** | |
136 | * set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports. | |
137 | * @dev: pointer to root port's pci_dev data structure | |
138 | * @enable: true = enable error reporting, false = disable error reporting. | |
139 | */ | |
140 | static void set_downstream_devices_error_reporting(struct pci_dev *dev, | |
141 | bool enable) | |
142 | { | |
143 | set_device_error_reporting(dev, &enable); | |
cb4cb4ac AC |
144 | |
145 | if (!dev->subordinate) | |
146 | return; | |
1f9f13c8 AP |
147 | pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); |
148 | } | |
149 | ||
28eb27cf ZY |
150 | static inline int compare_device_id(struct pci_dev *dev, |
151 | struct aer_err_info *e_info) | |
6c2b374d | 152 | { |
28eb27cf ZY |
153 | if (e_info->id == ((dev->bus->number << 8) | dev->devfn)) { |
154 | /* | |
155 | * Device ID match | |
156 | */ | |
157 | return 1; | |
158 | } | |
6c2b374d | 159 | |
28eb27cf ZY |
160 | return 0; |
161 | } | |
162 | ||
3d5505c5 ZY |
163 | static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev) |
164 | { | |
165 | if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) { | |
166 | e_info->dev[e_info->error_dev_num] = dev; | |
167 | e_info->error_dev_num++; | |
168 | return 1; | |
c9a91883 HS |
169 | } |
170 | ||
171 | return 0; | |
3d5505c5 ZY |
172 | } |
173 | ||
174 | ||
28eb27cf ZY |
175 | #define PCI_BUS(x) (((x) >> 8) & 0xff) |
176 | ||
177 | static int find_device_iter(struct pci_dev *dev, void *data) | |
178 | { | |
179 | int pos; | |
180 | u32 status; | |
181 | u32 mask; | |
182 | u16 reg16; | |
183 | int result; | |
184 | struct aer_err_info *e_info = (struct aer_err_info *)data; | |
185 | ||
186 | /* | |
187 | * When bus id is equal to 0, it might be a bad id | |
188 | * reported by root port. | |
189 | */ | |
190 | if (!nosourceid && (PCI_BUS(e_info->id) != 0)) { | |
191 | result = compare_device_id(dev, e_info); | |
192 | if (result) | |
3d5505c5 ZY |
193 | add_error_device(e_info, dev); |
194 | ||
195 | /* | |
196 | * If there is no multiple error, we stop | |
197 | * or continue based on the id comparing. | |
198 | */ | |
199 | if (!(e_info->flags & AER_MULTI_ERROR_VALID_FLAG)) | |
200 | return result; | |
201 | ||
202 | /* | |
203 | * If there are multiple errors and id does match, | |
204 | * We need continue to search other devices under | |
205 | * the root port. Return 0 means that. | |
206 | */ | |
207 | if (result) | |
208 | return 0; | |
28eb27cf ZY |
209 | } |
210 | ||
211 | /* | |
3d5505c5 ZY |
212 | * When either |
213 | * 1) nosourceid==y; | |
214 | * 2) bus id is equal to 0. Some ports might lose the bus | |
215 | * id of error source id; | |
216 | * 3) There are multiple errors and prior id comparing fails; | |
217 | * We check AER status registers to find the initial reporter. | |
28eb27cf ZY |
218 | */ |
219 | if (atomic_read(&dev->enable_cnt) == 0) | |
220 | return 0; | |
221 | pos = pci_find_capability(dev, PCI_CAP_ID_EXP); | |
222 | if (!pos) | |
223 | return 0; | |
224 | /* Check if AER is enabled */ | |
225 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); | |
226 | if (!(reg16 & ( | |
227 | PCI_EXP_DEVCTL_CERE | | |
228 | PCI_EXP_DEVCTL_NFERE | | |
229 | PCI_EXP_DEVCTL_FERE | | |
230 | PCI_EXP_DEVCTL_URRE))) | |
231 | return 0; | |
232 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); | |
233 | if (!pos) | |
234 | return 0; | |
235 | ||
236 | status = 0; | |
237 | mask = 0; | |
238 | if (e_info->severity == AER_CORRECTABLE) { | |
0d90c3ac HS |
239 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); |
240 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask); | |
241 | if (status & ~mask) { | |
3d5505c5 ZY |
242 | add_error_device(e_info, dev); |
243 | goto added; | |
6c2b374d | 244 | } |
28eb27cf | 245 | } else { |
0d90c3ac HS |
246 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); |
247 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask); | |
248 | if (status & ~mask) { | |
3d5505c5 ZY |
249 | add_error_device(e_info, dev); |
250 | goto added; | |
6c2b374d ZY |
251 | } |
252 | } | |
253 | ||
254 | return 0; | |
3d5505c5 ZY |
255 | |
256 | added: | |
257 | if (e_info->flags & AER_MULTI_ERROR_VALID_FLAG) | |
258 | return 0; | |
259 | else | |
260 | return 1; | |
6c2b374d ZY |
261 | } |
262 | ||
263 | /** | |
264 | * find_source_device - search through device hierarchy for source device | |
d885c6b7 | 265 | * @parent: pointer to Root Port pci_dev data structure |
28eb27cf | 266 | * @err_info: including detailed error information such like id |
6c2b374d ZY |
267 | * |
268 | * Invoked when error is detected at the Root Port. | |
d885c6b7 | 269 | */ |
28eb27cf ZY |
270 | static void find_source_device(struct pci_dev *parent, |
271 | struct aer_err_info *e_info) | |
6c2b374d ZY |
272 | { |
273 | struct pci_dev *dev = parent; | |
28eb27cf | 274 | int result; |
6c2b374d ZY |
275 | |
276 | /* Is Root Port an agent that sends error message? */ | |
28eb27cf ZY |
277 | result = find_device_iter(dev, e_info); |
278 | if (result) | |
279 | return; | |
6c2b374d | 280 | |
28eb27cf | 281 | pci_walk_bus(parent->subordinate, find_device_iter, e_info); |
6c2b374d ZY |
282 | } |
283 | ||
70298c6e | 284 | static int report_error_detected(struct pci_dev *dev, void *data) |
6c2b374d ZY |
285 | { |
286 | pci_ers_result_t vote; | |
287 | struct pci_error_handlers *err_handler; | |
288 | struct aer_broadcast_data *result_data; | |
289 | result_data = (struct aer_broadcast_data *) data; | |
290 | ||
291 | dev->error_state = result_data->state; | |
292 | ||
293 | if (!dev->driver || | |
294 | !dev->driver->err_handler || | |
295 | !dev->driver->err_handler->error_detected) { | |
296 | if (result_data->state == pci_channel_io_frozen && | |
297 | !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) { | |
298 | /* | |
299 | * In case of fatal recovery, if one of down- | |
300 | * stream device has no driver. We might be | |
301 | * unable to recover because a later insmod | |
302 | * of a driver for this device is unaware of | |
303 | * its hw state. | |
304 | */ | |
531f254e BH |
305 | dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n", |
306 | dev->driver ? | |
307 | "no AER-aware driver" : "no driver"); | |
6c2b374d | 308 | } |
70298c6e | 309 | return 0; |
6c2b374d ZY |
310 | } |
311 | ||
312 | err_handler = dev->driver->err_handler; | |
313 | vote = err_handler->error_detected(dev, result_data->state); | |
314 | result_data->result = merge_result(result_data->result, vote); | |
70298c6e | 315 | return 0; |
6c2b374d ZY |
316 | } |
317 | ||
70298c6e | 318 | static int report_mmio_enabled(struct pci_dev *dev, void *data) |
6c2b374d ZY |
319 | { |
320 | pci_ers_result_t vote; | |
321 | struct pci_error_handlers *err_handler; | |
322 | struct aer_broadcast_data *result_data; | |
323 | result_data = (struct aer_broadcast_data *) data; | |
324 | ||
325 | if (!dev->driver || | |
326 | !dev->driver->err_handler || | |
327 | !dev->driver->err_handler->mmio_enabled) | |
70298c6e | 328 | return 0; |
6c2b374d ZY |
329 | |
330 | err_handler = dev->driver->err_handler; | |
331 | vote = err_handler->mmio_enabled(dev); | |
332 | result_data->result = merge_result(result_data->result, vote); | |
70298c6e | 333 | return 0; |
6c2b374d ZY |
334 | } |
335 | ||
70298c6e | 336 | static int report_slot_reset(struct pci_dev *dev, void *data) |
6c2b374d ZY |
337 | { |
338 | pci_ers_result_t vote; | |
339 | struct pci_error_handlers *err_handler; | |
340 | struct aer_broadcast_data *result_data; | |
341 | result_data = (struct aer_broadcast_data *) data; | |
342 | ||
343 | if (!dev->driver || | |
344 | !dev->driver->err_handler || | |
345 | !dev->driver->err_handler->slot_reset) | |
70298c6e | 346 | return 0; |
6c2b374d ZY |
347 | |
348 | err_handler = dev->driver->err_handler; | |
349 | vote = err_handler->slot_reset(dev); | |
350 | result_data->result = merge_result(result_data->result, vote); | |
70298c6e | 351 | return 0; |
6c2b374d ZY |
352 | } |
353 | ||
70298c6e | 354 | static int report_resume(struct pci_dev *dev, void *data) |
6c2b374d ZY |
355 | { |
356 | struct pci_error_handlers *err_handler; | |
357 | ||
358 | dev->error_state = pci_channel_io_normal; | |
359 | ||
360 | if (!dev->driver || | |
361 | !dev->driver->err_handler || | |
b0b801dd | 362 | !dev->driver->err_handler->resume) |
70298c6e | 363 | return 0; |
6c2b374d ZY |
364 | |
365 | err_handler = dev->driver->err_handler; | |
366 | err_handler->resume(dev); | |
70298c6e | 367 | return 0; |
6c2b374d ZY |
368 | } |
369 | ||
370 | /** | |
371 | * broadcast_error_message - handle message broadcast to downstream drivers | |
d885c6b7 | 372 | * @dev: pointer to from where in a hierarchy message is broadcasted down |
6c2b374d | 373 | * @state: error state |
d885c6b7 RD |
374 | * @error_mesg: message to print |
375 | * @cb: callback to be broadcasted | |
6c2b374d ZY |
376 | * |
377 | * Invoked during error recovery process. Once being invoked, the content | |
378 | * of error severity will be broadcasted to all downstream drivers in a | |
379 | * hierarchy in question. | |
d885c6b7 | 380 | */ |
6c2b374d ZY |
381 | static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, |
382 | enum pci_channel_state state, | |
383 | char *error_mesg, | |
70298c6e | 384 | int (*cb)(struct pci_dev *, void *)) |
6c2b374d ZY |
385 | { |
386 | struct aer_broadcast_data result_data; | |
387 | ||
531f254e | 388 | dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg); |
6c2b374d ZY |
389 | result_data.state = state; |
390 | if (cb == report_error_detected) | |
391 | result_data.result = PCI_ERS_RESULT_CAN_RECOVER; | |
392 | else | |
393 | result_data.result = PCI_ERS_RESULT_RECOVERED; | |
394 | ||
395 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { | |
396 | /* | |
397 | * If the error is reported by a bridge, we think this error | |
398 | * is related to the downstream link of the bridge, so we | |
399 | * do error recovery on all subordinates of the bridge instead | |
400 | * of the bridge and clear the error status of the bridge. | |
401 | */ | |
402 | if (cb == report_error_detected) | |
403 | dev->error_state = state; | |
404 | pci_walk_bus(dev->subordinate, cb, &result_data); | |
405 | if (cb == report_resume) { | |
406 | pci_cleanup_aer_uncorrect_error_status(dev); | |
407 | dev->error_state = pci_channel_io_normal; | |
408 | } | |
c9a91883 | 409 | } else { |
6c2b374d ZY |
410 | /* |
411 | * If the error is reported by an end point, we think this | |
412 | * error is related to the upstream link of the end point. | |
413 | */ | |
414 | pci_walk_bus(dev->bus, cb, &result_data); | |
415 | } | |
416 | ||
417 | return result_data.result; | |
418 | } | |
419 | ||
420 | struct find_aer_service_data { | |
421 | struct pcie_port_service_driver *aer_driver; | |
422 | int is_downstream; | |
423 | }; | |
424 | ||
425 | static int find_aer_service_iter(struct device *device, void *data) | |
426 | { | |
427 | struct device_driver *driver; | |
428 | struct pcie_port_service_driver *service_driver; | |
6c2b374d ZY |
429 | struct find_aer_service_data *result; |
430 | ||
431 | result = (struct find_aer_service_data *) data; | |
432 | ||
433 | if (device->bus == &pcie_port_bus_type) { | |
22106368 RW |
434 | struct pcie_port_data *port_data; |
435 | ||
436 | port_data = pci_get_drvdata(to_pcie_device(device)->port); | |
437 | if (port_data->port_type == PCIE_SW_DOWNSTREAM_PORT) | |
6c2b374d ZY |
438 | result->is_downstream = 1; |
439 | ||
440 | driver = device->driver; | |
441 | if (driver) { | |
442 | service_driver = to_service_driver(driver); | |
22106368 | 443 | if (service_driver->service == PCIE_PORT_SERVICE_AER) { |
6c2b374d ZY |
444 | result->aer_driver = service_driver; |
445 | return 1; | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | static void find_aer_service(struct pci_dev *dev, | |
454 | struct find_aer_service_data *data) | |
455 | { | |
b19441af GKH |
456 | int retval; |
457 | retval = device_for_each_child(&dev->dev, data, find_aer_service_iter); | |
6c2b374d ZY |
458 | } |
459 | ||
460 | static pci_ers_result_t reset_link(struct pcie_device *aerdev, | |
461 | struct pci_dev *dev) | |
462 | { | |
463 | struct pci_dev *udev; | |
464 | pci_ers_result_t status; | |
465 | struct find_aer_service_data data; | |
466 | ||
467 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) | |
468 | udev = dev; | |
469 | else | |
c9a91883 | 470 | udev = dev->bus->self; |
6c2b374d ZY |
471 | |
472 | data.is_downstream = 0; | |
473 | data.aer_driver = NULL; | |
474 | find_aer_service(udev, &data); | |
475 | ||
476 | /* | |
477 | * Use the aer driver of the error agent firstly. | |
478 | * If it hasn't the aer driver, use the root port's | |
479 | */ | |
480 | if (!data.aer_driver || !data.aer_driver->reset_link) { | |
481 | if (data.is_downstream && | |
482 | aerdev->device.driver && | |
483 | to_service_driver(aerdev->device.driver)->reset_link) { | |
484 | data.aer_driver = | |
485 | to_service_driver(aerdev->device.driver); | |
486 | } else { | |
531f254e BH |
487 | dev_printk(KERN_DEBUG, &dev->dev, "no link-reset " |
488 | "support\n"); | |
6c2b374d ZY |
489 | return PCI_ERS_RESULT_DISCONNECT; |
490 | } | |
491 | } | |
492 | ||
493 | status = data.aer_driver->reset_link(udev); | |
494 | if (status != PCI_ERS_RESULT_RECOVERED) { | |
531f254e BH |
495 | dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream " |
496 | "device %s failed\n", pci_name(udev)); | |
6c2b374d ZY |
497 | return PCI_ERS_RESULT_DISCONNECT; |
498 | } | |
499 | ||
500 | return status; | |
501 | } | |
502 | ||
503 | /** | |
504 | * do_recovery - handle nonfatal/fatal error recovery process | |
505 | * @aerdev: pointer to a pcie_device data structure of root port | |
506 | * @dev: pointer to a pci_dev data structure of agent detecting an error | |
507 | * @severity: error severity type | |
508 | * | |
509 | * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast | |
510 | * error detected message to all downstream drivers within a hierarchy in | |
511 | * question and return the returned code. | |
d885c6b7 | 512 | */ |
6c2b374d ZY |
513 | static pci_ers_result_t do_recovery(struct pcie_device *aerdev, |
514 | struct pci_dev *dev, | |
515 | int severity) | |
516 | { | |
517 | pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED; | |
518 | enum pci_channel_state state; | |
519 | ||
520 | if (severity == AER_FATAL) | |
521 | state = pci_channel_io_frozen; | |
522 | else | |
523 | state = pci_channel_io_normal; | |
524 | ||
525 | status = broadcast_error_message(dev, | |
526 | state, | |
527 | "error_detected", | |
528 | report_error_detected); | |
529 | ||
530 | if (severity == AER_FATAL) { | |
531 | result = reset_link(aerdev, dev); | |
532 | if (result != PCI_ERS_RESULT_RECOVERED) { | |
533 | /* TODO: Should panic here? */ | |
534 | return result; | |
535 | } | |
536 | } | |
537 | ||
538 | if (status == PCI_ERS_RESULT_CAN_RECOVER) | |
539 | status = broadcast_error_message(dev, | |
540 | state, | |
541 | "mmio_enabled", | |
542 | report_mmio_enabled); | |
543 | ||
544 | if (status == PCI_ERS_RESULT_NEED_RESET) { | |
545 | /* | |
546 | * TODO: Should call platform-specific | |
547 | * functions to reset slot before calling | |
548 | * drivers' slot_reset callbacks? | |
549 | */ | |
550 | status = broadcast_error_message(dev, | |
551 | state, | |
552 | "slot_reset", | |
553 | report_slot_reset); | |
554 | } | |
555 | ||
556 | if (status == PCI_ERS_RESULT_RECOVERED) | |
557 | broadcast_error_message(dev, | |
558 | state, | |
559 | "resume", | |
560 | report_resume); | |
561 | ||
562 | return status; | |
563 | } | |
564 | ||
565 | /** | |
566 | * handle_error_source - handle logging error into an event log | |
567 | * @aerdev: pointer to pcie_device data structure of the root port | |
568 | * @dev: pointer to pci_dev data structure of error source device | |
569 | * @info: comprehensive error information | |
570 | * | |
571 | * Invoked when an error being detected by Root Port. | |
d885c6b7 | 572 | */ |
c9a91883 | 573 | static void handle_error_source(struct pcie_device *aerdev, |
6c2b374d | 574 | struct pci_dev *dev, |
28eb27cf | 575 | struct aer_err_info *info) |
6c2b374d ZY |
576 | { |
577 | pci_ers_result_t status = 0; | |
578 | int pos; | |
579 | ||
28eb27cf | 580 | if (info->severity == AER_CORRECTABLE) { |
6c2b374d ZY |
581 | /* |
582 | * Correctable error does not need software intevention. | |
583 | * No need to go through error recovery process. | |
584 | */ | |
0927678f | 585 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
586 | if (pos) |
587 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
28eb27cf | 588 | info->status); |
6c2b374d | 589 | } else { |
28eb27cf | 590 | status = do_recovery(aerdev, dev, info->severity); |
6c2b374d | 591 | if (status == PCI_ERS_RESULT_RECOVERED) { |
531f254e BH |
592 | dev_printk(KERN_DEBUG, &dev->dev, "AER driver " |
593 | "successfully recovered\n"); | |
6c2b374d ZY |
594 | } else { |
595 | /* TODO: Should kernel panic here? */ | |
531f254e BH |
596 | dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't " |
597 | "recover\n"); | |
6c2b374d ZY |
598 | } |
599 | } | |
600 | } | |
601 | ||
602 | /** | |
603 | * aer_enable_rootport - enable Root Port's interrupts when receiving messages | |
604 | * @rpc: pointer to a Root Port data structure | |
605 | * | |
606 | * Invoked when PCIE bus loads AER service driver. | |
d885c6b7 | 607 | */ |
6c2b374d ZY |
608 | void aer_enable_rootport(struct aer_rpc *rpc) |
609 | { | |
610 | struct pci_dev *pdev = rpc->rpd->port; | |
611 | int pos, aer_pos; | |
612 | u16 reg16; | |
613 | u32 reg32; | |
614 | ||
615 | pos = pci_find_capability(pdev, PCI_CAP_ID_EXP); | |
616 | /* Clear PCIE Capability's Device Status */ | |
617 | pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, ®16); | |
618 | pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16); | |
619 | ||
620 | /* Disable system error generation in response to error messages */ | |
621 | pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, ®16); | |
622 | reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK); | |
623 | pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16); | |
624 | ||
0927678f | 625 | aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
626 | /* Clear error status */ |
627 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32); | |
628 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32); | |
629 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32); | |
630 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32); | |
631 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32); | |
632 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32); | |
633 | ||
1f9f13c8 AP |
634 | /* |
635 | * Enable error reporting for the root port device and downstream port | |
636 | * devices. | |
637 | */ | |
638 | set_downstream_devices_error_reporting(pdev, true); | |
6c2b374d ZY |
639 | |
640 | /* Enable Root Port's interrupt in response to error messages */ | |
641 | pci_write_config_dword(pdev, | |
642 | aer_pos + PCI_ERR_ROOT_COMMAND, | |
643 | ROOT_PORT_INTR_ON_MESG_MASK); | |
644 | } | |
645 | ||
646 | /** | |
647 | * disable_root_aer - disable Root Port's interrupts when receiving messages | |
648 | * @rpc: pointer to a Root Port data structure | |
649 | * | |
650 | * Invoked when PCIE bus unloads AER service driver. | |
d885c6b7 | 651 | */ |
6c2b374d ZY |
652 | static void disable_root_aer(struct aer_rpc *rpc) |
653 | { | |
654 | struct pci_dev *pdev = rpc->rpd->port; | |
655 | u32 reg32; | |
656 | int pos; | |
657 | ||
1f9f13c8 AP |
658 | /* |
659 | * Disable error reporting for the root port device and downstream port | |
660 | * devices. | |
661 | */ | |
662 | set_downstream_devices_error_reporting(pdev, false); | |
663 | ||
0927678f | 664 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
665 | /* Disable Root's interrupt in response to error messages */ |
666 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0); | |
667 | ||
668 | /* Clear Root's error status reg */ | |
669 | pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32); | |
670 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32); | |
671 | } | |
672 | ||
673 | /** | |
674 | * get_e_source - retrieve an error source | |
675 | * @rpc: pointer to the root port which holds an error | |
676 | * | |
677 | * Invoked by DPC handler to consume an error. | |
d885c6b7 | 678 | */ |
c9a91883 | 679 | static struct aer_err_source *get_e_source(struct aer_rpc *rpc) |
6c2b374d ZY |
680 | { |
681 | struct aer_err_source *e_source; | |
682 | unsigned long flags; | |
683 | ||
684 | /* Lock access to Root error producer/consumer index */ | |
685 | spin_lock_irqsave(&rpc->e_lock, flags); | |
686 | if (rpc->prod_idx == rpc->cons_idx) { | |
687 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
688 | return NULL; | |
689 | } | |
690 | e_source = &rpc->e_sources[rpc->cons_idx]; | |
691 | rpc->cons_idx++; | |
692 | if (rpc->cons_idx == AER_ERROR_SOURCES_MAX) | |
693 | rpc->cons_idx = 0; | |
694 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
695 | ||
696 | return e_source; | |
697 | } | |
698 | ||
699 | static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) | |
700 | { | |
e7a0d92b | 701 | int pos, temp; |
6c2b374d | 702 | |
1b4ffcf8 HS |
703 | info->status = 0; |
704 | info->flags &= ~AER_TLP_HEADER_VALID_FLAG; | |
705 | ||
0927678f | 706 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
707 | |
708 | /* The device might not support AER */ | |
709 | if (!pos) | |
710 | return AER_SUCCESS; | |
711 | ||
712 | if (info->severity == AER_CORRECTABLE) { | |
713 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
714 | &info->status); | |
0d90c3ac HS |
715 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, |
716 | &info->mask); | |
717 | if (!(info->status & ~info->mask)) | |
6c2b374d ZY |
718 | return AER_UNSUCCESS; |
719 | } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE || | |
720 | info->severity == AER_NONFATAL) { | |
721 | ||
722 | /* Link is still healthy for IO reads */ | |
723 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, | |
724 | &info->status); | |
0d90c3ac HS |
725 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, |
726 | &info->mask); | |
727 | if (!(info->status & ~info->mask)) | |
6c2b374d ZY |
728 | return AER_UNSUCCESS; |
729 | ||
e7a0d92b HS |
730 | /* Get First Error Pointer */ |
731 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp); | |
732 | info->first = PCI_ERR_CAP_FEP(temp); | |
733 | ||
6c2b374d ZY |
734 | if (info->status & AER_LOG_TLP_MASKS) { |
735 | info->flags |= AER_TLP_HEADER_VALID_FLAG; | |
736 | pci_read_config_dword(dev, | |
737 | pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0); | |
738 | pci_read_config_dword(dev, | |
739 | pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1); | |
740 | pci_read_config_dword(dev, | |
741 | pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2); | |
742 | pci_read_config_dword(dev, | |
743 | pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3); | |
744 | } | |
745 | } | |
746 | ||
747 | return AER_SUCCESS; | |
748 | } | |
749 | ||
3d5505c5 ZY |
750 | static inline void aer_process_err_devices(struct pcie_device *p_device, |
751 | struct aer_err_info *e_info) | |
752 | { | |
753 | int i; | |
754 | ||
755 | if (!e_info->dev[0]) { | |
756 | dev_printk(KERN_DEBUG, &p_device->port->dev, | |
757 | "can't find device of ID%04x\n", | |
758 | e_info->id); | |
759 | } | |
760 | ||
761 | for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { | |
762 | if (get_device_error_info(e_info->dev[i], e_info) == | |
763 | AER_SUCCESS) { | |
764 | aer_print_error(e_info->dev[i], e_info); | |
765 | handle_error_source(p_device, | |
766 | e_info->dev[i], | |
767 | e_info); | |
768 | } | |
769 | } | |
770 | } | |
771 | ||
6c2b374d ZY |
772 | /** |
773 | * aer_isr_one_error - consume an error detected by root port | |
774 | * @p_device: pointer to error root port service device | |
775 | * @e_src: pointer to an error source | |
d885c6b7 | 776 | */ |
6c2b374d ZY |
777 | static void aer_isr_one_error(struct pcie_device *p_device, |
778 | struct aer_err_source *e_src) | |
779 | { | |
28eb27cf | 780 | struct aer_err_info *e_info; |
6c2b374d | 781 | int i; |
28eb27cf ZY |
782 | |
783 | /* struct aer_err_info might be big, so we allocate it with slab */ | |
784 | e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL); | |
785 | if (e_info == NULL) { | |
786 | dev_printk(KERN_DEBUG, &p_device->port->dev, | |
787 | "Can't allocate mem when processing AER errors\n"); | |
788 | return; | |
789 | } | |
6c2b374d ZY |
790 | |
791 | /* | |
792 | * There is a possibility that both correctable error and | |
793 | * uncorrectable error being logged. Report correctable error first. | |
794 | */ | |
795 | for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) { | |
796 | if (i > 4) | |
797 | break; | |
798 | if (!(e_src->status & i)) | |
799 | continue; | |
800 | ||
28eb27cf ZY |
801 | memset(e_info, 0, sizeof(struct aer_err_info)); |
802 | ||
6c2b374d ZY |
803 | /* Init comprehensive error information */ |
804 | if (i & PCI_ERR_ROOT_COR_RCV) { | |
28eb27cf ZY |
805 | e_info->id = ERR_COR_ID(e_src->id); |
806 | e_info->severity = AER_CORRECTABLE; | |
6c2b374d | 807 | } else { |
28eb27cf ZY |
808 | e_info->id = ERR_UNCOR_ID(e_src->id); |
809 | e_info->severity = ((e_src->status >> 6) & 1); | |
6c2b374d ZY |
810 | } |
811 | if (e_src->status & | |
812 | (PCI_ERR_ROOT_MULTI_COR_RCV | | |
813 | PCI_ERR_ROOT_MULTI_UNCOR_RCV)) | |
28eb27cf ZY |
814 | e_info->flags |= AER_MULTI_ERROR_VALID_FLAG; |
815 | ||
816 | find_source_device(p_device->port, e_info); | |
3d5505c5 | 817 | aer_process_err_devices(p_device, e_info); |
6c2b374d | 818 | } |
28eb27cf ZY |
819 | |
820 | kfree(e_info); | |
6c2b374d ZY |
821 | } |
822 | ||
823 | /** | |
824 | * aer_isr - consume errors detected by root port | |
65f27f38 | 825 | * @work: definition of this work item |
6c2b374d ZY |
826 | * |
827 | * Invoked, as DPC, when root port records new detected error | |
d885c6b7 | 828 | */ |
65f27f38 | 829 | void aer_isr(struct work_struct *work) |
6c2b374d | 830 | { |
65f27f38 DH |
831 | struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler); |
832 | struct pcie_device *p_device = rpc->rpd; | |
6c2b374d ZY |
833 | struct aer_err_source *e_src; |
834 | ||
835 | mutex_lock(&rpc->rpc_mutex); | |
836 | e_src = get_e_source(rpc); | |
837 | while (e_src) { | |
838 | aer_isr_one_error(p_device, e_src); | |
839 | e_src = get_e_source(rpc); | |
840 | } | |
841 | mutex_unlock(&rpc->rpc_mutex); | |
842 | ||
843 | wake_up(&rpc->wait_release); | |
844 | } | |
845 | ||
846 | /** | |
847 | * aer_delete_rootport - disable root port aer and delete service data | |
848 | * @rpc: pointer to a root port device being deleted | |
849 | * | |
850 | * Invoked when AER service unloaded on a specific Root Port | |
d885c6b7 | 851 | */ |
6c2b374d ZY |
852 | void aer_delete_rootport(struct aer_rpc *rpc) |
853 | { | |
854 | /* Disable root port AER itself */ | |
855 | disable_root_aer(rpc); | |
856 | ||
857 | kfree(rpc); | |
858 | } | |
859 | ||
860 | /** | |
861 | * aer_init - provide AER initialization | |
862 | * @dev: pointer to AER pcie device | |
863 | * | |
864 | * Invoked when AER service driver is loaded. | |
d885c6b7 | 865 | */ |
6c2b374d ZY |
866 | int aer_init(struct pcie_device *dev) |
867 | { | |
8d29bfb7 ZY |
868 | if (aer_osc_setup(dev) && !forceload) |
869 | return -ENXIO; | |
6c2b374d ZY |
870 | |
871 | return AER_SUCCESS; | |
872 | } |