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Commit | Line | Data |
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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 | 25 | #include <linux/delay.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
6c2b374d ZY |
27 | #include "aerdrv.h" |
28 | ||
29 | static int forceload; | |
28eb27cf | 30 | static int nosourceid; |
6c2b374d | 31 | module_param(forceload, bool, 0); |
28eb27cf | 32 | module_param(nosourceid, bool, 0); |
6c2b374d | 33 | |
6c2b374d ZY |
34 | int pci_enable_pcie_error_reporting(struct pci_dev *dev) |
35 | { | |
36 | u16 reg16 = 0; | |
37 | int pos; | |
38 | ||
05843961 MD |
39 | if (dev->aer_firmware_first) |
40 | return -EIO; | |
41 | ||
270c66be | 42 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
43 | if (!pos) |
44 | return -EIO; | |
45 | ||
39a53062 | 46 | pos = pci_pcie_cap(dev); |
0927678f JB |
47 | if (!pos) |
48 | return -EIO; | |
49 | ||
6c2b374d ZY |
50 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); |
51 | reg16 = reg16 | | |
52 | PCI_EXP_DEVCTL_CERE | | |
53 | PCI_EXP_DEVCTL_NFERE | | |
54 | PCI_EXP_DEVCTL_FERE | | |
55 | PCI_EXP_DEVCTL_URRE; | |
c9a91883 HS |
56 | pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16); |
57 | ||
6c2b374d ZY |
58 | return 0; |
59 | } | |
c9a91883 | 60 | EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting); |
6c2b374d ZY |
61 | |
62 | int pci_disable_pcie_error_reporting(struct pci_dev *dev) | |
63 | { | |
64 | u16 reg16 = 0; | |
65 | int pos; | |
66 | ||
05843961 MD |
67 | if (dev->aer_firmware_first) |
68 | return -EIO; | |
69 | ||
39a53062 | 70 | pos = pci_pcie_cap(dev); |
6c2b374d ZY |
71 | if (!pos) |
72 | return -EIO; | |
73 | ||
74 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); | |
75 | reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE | | |
76 | PCI_EXP_DEVCTL_NFERE | | |
77 | PCI_EXP_DEVCTL_FERE | | |
78 | PCI_EXP_DEVCTL_URRE); | |
c9a91883 HS |
79 | pci_write_config_word(dev, pos+PCI_EXP_DEVCTL, reg16); |
80 | ||
6c2b374d ZY |
81 | return 0; |
82 | } | |
c9a91883 | 83 | EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting); |
6c2b374d ZY |
84 | |
85 | int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) | |
86 | { | |
87 | int pos; | |
6cdfd995 | 88 | u32 status; |
6c2b374d | 89 | |
0927678f | 90 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
91 | if (!pos) |
92 | return -EIO; | |
93 | ||
94 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); | |
6cdfd995 AP |
95 | if (status) |
96 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); | |
6c2b374d ZY |
97 | |
98 | return 0; | |
99 | } | |
c9a91883 | 100 | EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status); |
6c2b374d | 101 | |
70298c6e | 102 | static int set_device_error_reporting(struct pci_dev *dev, void *data) |
1f9f13c8 AP |
103 | { |
104 | bool enable = *((bool *)data); | |
105 | ||
694f88ef KK |
106 | if ((dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) || |
107 | (dev->pcie_type == PCI_EXP_TYPE_UPSTREAM) || | |
108 | (dev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)) { | |
43c16408 AP |
109 | if (enable) |
110 | pci_enable_pcie_error_reporting(dev); | |
111 | else | |
112 | pci_disable_pcie_error_reporting(dev); | |
113 | } | |
1f9f13c8 AP |
114 | |
115 | if (enable) | |
43c16408 | 116 | pcie_set_ecrc_checking(dev); |
70298c6e ZY |
117 | |
118 | return 0; | |
1f9f13c8 AP |
119 | } |
120 | ||
121 | /** | |
122 | * set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports. | |
123 | * @dev: pointer to root port's pci_dev data structure | |
124 | * @enable: true = enable error reporting, false = disable error reporting. | |
125 | */ | |
126 | static void set_downstream_devices_error_reporting(struct pci_dev *dev, | |
127 | bool enable) | |
128 | { | |
129 | set_device_error_reporting(dev, &enable); | |
cb4cb4ac AC |
130 | |
131 | if (!dev->subordinate) | |
132 | return; | |
1f9f13c8 AP |
133 | pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); |
134 | } | |
135 | ||
28eb27cf ZY |
136 | static inline int compare_device_id(struct pci_dev *dev, |
137 | struct aer_err_info *e_info) | |
6c2b374d | 138 | { |
28eb27cf ZY |
139 | if (e_info->id == ((dev->bus->number << 8) | dev->devfn)) { |
140 | /* | |
141 | * Device ID match | |
142 | */ | |
143 | return 1; | |
144 | } | |
6c2b374d | 145 | |
28eb27cf ZY |
146 | return 0; |
147 | } | |
148 | ||
3d5505c5 ZY |
149 | static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev) |
150 | { | |
151 | if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) { | |
152 | e_info->dev[e_info->error_dev_num] = dev; | |
153 | e_info->error_dev_num++; | |
154 | return 1; | |
c9a91883 HS |
155 | } |
156 | ||
157 | return 0; | |
3d5505c5 ZY |
158 | } |
159 | ||
160 | ||
28eb27cf ZY |
161 | #define PCI_BUS(x) (((x) >> 8) & 0xff) |
162 | ||
163 | static int find_device_iter(struct pci_dev *dev, void *data) | |
164 | { | |
165 | int pos; | |
166 | u32 status; | |
167 | u32 mask; | |
168 | u16 reg16; | |
169 | int result; | |
170 | struct aer_err_info *e_info = (struct aer_err_info *)data; | |
171 | ||
172 | /* | |
173 | * When bus id is equal to 0, it might be a bad id | |
174 | * reported by root port. | |
175 | */ | |
176 | if (!nosourceid && (PCI_BUS(e_info->id) != 0)) { | |
177 | result = compare_device_id(dev, e_info); | |
178 | if (result) | |
3d5505c5 ZY |
179 | add_error_device(e_info, dev); |
180 | ||
181 | /* | |
182 | * If there is no multiple error, we stop | |
183 | * or continue based on the id comparing. | |
184 | */ | |
273024de | 185 | if (!e_info->multi_error_valid) |
3d5505c5 ZY |
186 | return result; |
187 | ||
188 | /* | |
189 | * If there are multiple errors and id does match, | |
190 | * We need continue to search other devices under | |
191 | * the root port. Return 0 means that. | |
192 | */ | |
193 | if (result) | |
194 | return 0; | |
28eb27cf ZY |
195 | } |
196 | ||
197 | /* | |
3d5505c5 ZY |
198 | * When either |
199 | * 1) nosourceid==y; | |
200 | * 2) bus id is equal to 0. Some ports might lose the bus | |
201 | * id of error source id; | |
202 | * 3) There are multiple errors and prior id comparing fails; | |
203 | * We check AER status registers to find the initial reporter. | |
28eb27cf ZY |
204 | */ |
205 | if (atomic_read(&dev->enable_cnt) == 0) | |
206 | return 0; | |
39a53062 | 207 | pos = pci_pcie_cap(dev); |
28eb27cf ZY |
208 | if (!pos) |
209 | return 0; | |
210 | /* Check if AER is enabled */ | |
211 | pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16); | |
212 | if (!(reg16 & ( | |
213 | PCI_EXP_DEVCTL_CERE | | |
214 | PCI_EXP_DEVCTL_NFERE | | |
215 | PCI_EXP_DEVCTL_FERE | | |
216 | PCI_EXP_DEVCTL_URRE))) | |
217 | return 0; | |
218 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); | |
219 | if (!pos) | |
220 | return 0; | |
221 | ||
222 | status = 0; | |
223 | mask = 0; | |
224 | if (e_info->severity == AER_CORRECTABLE) { | |
0d90c3ac HS |
225 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); |
226 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask); | |
227 | if (status & ~mask) { | |
3d5505c5 ZY |
228 | add_error_device(e_info, dev); |
229 | goto added; | |
6c2b374d | 230 | } |
28eb27cf | 231 | } else { |
0d90c3ac HS |
232 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); |
233 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask); | |
234 | if (status & ~mask) { | |
3d5505c5 ZY |
235 | add_error_device(e_info, dev); |
236 | goto added; | |
6c2b374d ZY |
237 | } |
238 | } | |
239 | ||
240 | return 0; | |
3d5505c5 ZY |
241 | |
242 | added: | |
273024de | 243 | if (e_info->multi_error_valid) |
3d5505c5 ZY |
244 | return 0; |
245 | else | |
246 | return 1; | |
6c2b374d ZY |
247 | } |
248 | ||
249 | /** | |
250 | * find_source_device - search through device hierarchy for source device | |
d885c6b7 | 251 | * @parent: pointer to Root Port pci_dev data structure |
28eb27cf | 252 | * @err_info: including detailed error information such like id |
6c2b374d ZY |
253 | * |
254 | * Invoked when error is detected at the Root Port. | |
d885c6b7 | 255 | */ |
28eb27cf ZY |
256 | static void find_source_device(struct pci_dev *parent, |
257 | struct aer_err_info *e_info) | |
6c2b374d ZY |
258 | { |
259 | struct pci_dev *dev = parent; | |
28eb27cf | 260 | int result; |
6c2b374d ZY |
261 | |
262 | /* Is Root Port an agent that sends error message? */ | |
28eb27cf ZY |
263 | result = find_device_iter(dev, e_info); |
264 | if (result) | |
265 | return; | |
6c2b374d | 266 | |
28eb27cf | 267 | pci_walk_bus(parent->subordinate, find_device_iter, e_info); |
6c2b374d ZY |
268 | } |
269 | ||
70298c6e | 270 | static int report_error_detected(struct pci_dev *dev, void *data) |
6c2b374d ZY |
271 | { |
272 | pci_ers_result_t vote; | |
273 | struct pci_error_handlers *err_handler; | |
274 | struct aer_broadcast_data *result_data; | |
275 | result_data = (struct aer_broadcast_data *) data; | |
276 | ||
277 | dev->error_state = result_data->state; | |
278 | ||
279 | if (!dev->driver || | |
280 | !dev->driver->err_handler || | |
281 | !dev->driver->err_handler->error_detected) { | |
282 | if (result_data->state == pci_channel_io_frozen && | |
283 | !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) { | |
284 | /* | |
285 | * In case of fatal recovery, if one of down- | |
286 | * stream device has no driver. We might be | |
287 | * unable to recover because a later insmod | |
288 | * of a driver for this device is unaware of | |
289 | * its hw state. | |
290 | */ | |
531f254e BH |
291 | dev_printk(KERN_DEBUG, &dev->dev, "device has %s\n", |
292 | dev->driver ? | |
293 | "no AER-aware driver" : "no driver"); | |
6c2b374d | 294 | } |
70298c6e | 295 | return 0; |
6c2b374d ZY |
296 | } |
297 | ||
298 | err_handler = dev->driver->err_handler; | |
299 | vote = err_handler->error_detected(dev, result_data->state); | |
300 | result_data->result = merge_result(result_data->result, vote); | |
70298c6e | 301 | return 0; |
6c2b374d ZY |
302 | } |
303 | ||
70298c6e | 304 | static int report_mmio_enabled(struct pci_dev *dev, void *data) |
6c2b374d ZY |
305 | { |
306 | pci_ers_result_t vote; | |
307 | struct pci_error_handlers *err_handler; | |
308 | struct aer_broadcast_data *result_data; | |
309 | result_data = (struct aer_broadcast_data *) data; | |
310 | ||
311 | if (!dev->driver || | |
312 | !dev->driver->err_handler || | |
313 | !dev->driver->err_handler->mmio_enabled) | |
70298c6e | 314 | return 0; |
6c2b374d ZY |
315 | |
316 | err_handler = dev->driver->err_handler; | |
317 | vote = err_handler->mmio_enabled(dev); | |
318 | result_data->result = merge_result(result_data->result, vote); | |
70298c6e | 319 | return 0; |
6c2b374d ZY |
320 | } |
321 | ||
70298c6e | 322 | static int report_slot_reset(struct pci_dev *dev, void *data) |
6c2b374d ZY |
323 | { |
324 | pci_ers_result_t vote; | |
325 | struct pci_error_handlers *err_handler; | |
326 | struct aer_broadcast_data *result_data; | |
327 | result_data = (struct aer_broadcast_data *) data; | |
328 | ||
329 | if (!dev->driver || | |
330 | !dev->driver->err_handler || | |
331 | !dev->driver->err_handler->slot_reset) | |
70298c6e | 332 | return 0; |
6c2b374d ZY |
333 | |
334 | err_handler = dev->driver->err_handler; | |
335 | vote = err_handler->slot_reset(dev); | |
336 | result_data->result = merge_result(result_data->result, vote); | |
70298c6e | 337 | return 0; |
6c2b374d ZY |
338 | } |
339 | ||
70298c6e | 340 | static int report_resume(struct pci_dev *dev, void *data) |
6c2b374d ZY |
341 | { |
342 | struct pci_error_handlers *err_handler; | |
343 | ||
344 | dev->error_state = pci_channel_io_normal; | |
345 | ||
346 | if (!dev->driver || | |
347 | !dev->driver->err_handler || | |
b0b801dd | 348 | !dev->driver->err_handler->resume) |
70298c6e | 349 | return 0; |
6c2b374d ZY |
350 | |
351 | err_handler = dev->driver->err_handler; | |
352 | err_handler->resume(dev); | |
70298c6e | 353 | return 0; |
6c2b374d ZY |
354 | } |
355 | ||
356 | /** | |
357 | * broadcast_error_message - handle message broadcast to downstream drivers | |
d885c6b7 | 358 | * @dev: pointer to from where in a hierarchy message is broadcasted down |
6c2b374d | 359 | * @state: error state |
d885c6b7 RD |
360 | * @error_mesg: message to print |
361 | * @cb: callback to be broadcasted | |
6c2b374d ZY |
362 | * |
363 | * Invoked during error recovery process. Once being invoked, the content | |
364 | * of error severity will be broadcasted to all downstream drivers in a | |
365 | * hierarchy in question. | |
d885c6b7 | 366 | */ |
6c2b374d ZY |
367 | static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, |
368 | enum pci_channel_state state, | |
369 | char *error_mesg, | |
70298c6e | 370 | int (*cb)(struct pci_dev *, void *)) |
6c2b374d ZY |
371 | { |
372 | struct aer_broadcast_data result_data; | |
373 | ||
531f254e | 374 | dev_printk(KERN_DEBUG, &dev->dev, "broadcast %s message\n", error_mesg); |
6c2b374d ZY |
375 | result_data.state = state; |
376 | if (cb == report_error_detected) | |
377 | result_data.result = PCI_ERS_RESULT_CAN_RECOVER; | |
378 | else | |
379 | result_data.result = PCI_ERS_RESULT_RECOVERED; | |
380 | ||
381 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) { | |
382 | /* | |
383 | * If the error is reported by a bridge, we think this error | |
384 | * is related to the downstream link of the bridge, so we | |
385 | * do error recovery on all subordinates of the bridge instead | |
386 | * of the bridge and clear the error status of the bridge. | |
387 | */ | |
388 | if (cb == report_error_detected) | |
389 | dev->error_state = state; | |
390 | pci_walk_bus(dev->subordinate, cb, &result_data); | |
391 | if (cb == report_resume) { | |
392 | pci_cleanup_aer_uncorrect_error_status(dev); | |
393 | dev->error_state = pci_channel_io_normal; | |
394 | } | |
c9a91883 | 395 | } else { |
6c2b374d ZY |
396 | /* |
397 | * If the error is reported by an end point, we think this | |
398 | * error is related to the upstream link of the end point. | |
399 | */ | |
400 | pci_walk_bus(dev->bus, cb, &result_data); | |
401 | } | |
402 | ||
403 | return result_data.result; | |
404 | } | |
405 | ||
406 | struct find_aer_service_data { | |
407 | struct pcie_port_service_driver *aer_driver; | |
408 | int is_downstream; | |
409 | }; | |
410 | ||
411 | static int find_aer_service_iter(struct device *device, void *data) | |
412 | { | |
413 | struct device_driver *driver; | |
414 | struct pcie_port_service_driver *service_driver; | |
6c2b374d ZY |
415 | struct find_aer_service_data *result; |
416 | ||
417 | result = (struct find_aer_service_data *) data; | |
418 | ||
419 | if (device->bus == &pcie_port_bus_type) { | |
694f88ef | 420 | struct pcie_device *pcie = to_pcie_device(device); |
22106368 | 421 | |
694f88ef | 422 | if (pcie->port->pcie_type == PCI_EXP_TYPE_DOWNSTREAM) |
6c2b374d ZY |
423 | result->is_downstream = 1; |
424 | ||
425 | driver = device->driver; | |
426 | if (driver) { | |
427 | service_driver = to_service_driver(driver); | |
22106368 | 428 | if (service_driver->service == PCIE_PORT_SERVICE_AER) { |
6c2b374d ZY |
429 | result->aer_driver = service_driver; |
430 | return 1; | |
431 | } | |
432 | } | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static void find_aer_service(struct pci_dev *dev, | |
439 | struct find_aer_service_data *data) | |
440 | { | |
b19441af GKH |
441 | int retval; |
442 | retval = device_for_each_child(&dev->dev, data, find_aer_service_iter); | |
6c2b374d ZY |
443 | } |
444 | ||
445 | static pci_ers_result_t reset_link(struct pcie_device *aerdev, | |
446 | struct pci_dev *dev) | |
447 | { | |
448 | struct pci_dev *udev; | |
449 | pci_ers_result_t status; | |
450 | struct find_aer_service_data data; | |
451 | ||
452 | if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) | |
453 | udev = dev; | |
454 | else | |
c9a91883 | 455 | udev = dev->bus->self; |
6c2b374d ZY |
456 | |
457 | data.is_downstream = 0; | |
458 | data.aer_driver = NULL; | |
459 | find_aer_service(udev, &data); | |
460 | ||
461 | /* | |
462 | * Use the aer driver of the error agent firstly. | |
463 | * If it hasn't the aer driver, use the root port's | |
464 | */ | |
465 | if (!data.aer_driver || !data.aer_driver->reset_link) { | |
466 | if (data.is_downstream && | |
467 | aerdev->device.driver && | |
468 | to_service_driver(aerdev->device.driver)->reset_link) { | |
469 | data.aer_driver = | |
470 | to_service_driver(aerdev->device.driver); | |
471 | } else { | |
531f254e BH |
472 | dev_printk(KERN_DEBUG, &dev->dev, "no link-reset " |
473 | "support\n"); | |
6c2b374d ZY |
474 | return PCI_ERS_RESULT_DISCONNECT; |
475 | } | |
476 | } | |
477 | ||
478 | status = data.aer_driver->reset_link(udev); | |
479 | if (status != PCI_ERS_RESULT_RECOVERED) { | |
531f254e BH |
480 | dev_printk(KERN_DEBUG, &dev->dev, "link reset at upstream " |
481 | "device %s failed\n", pci_name(udev)); | |
6c2b374d ZY |
482 | return PCI_ERS_RESULT_DISCONNECT; |
483 | } | |
484 | ||
485 | return status; | |
486 | } | |
487 | ||
488 | /** | |
489 | * do_recovery - handle nonfatal/fatal error recovery process | |
490 | * @aerdev: pointer to a pcie_device data structure of root port | |
491 | * @dev: pointer to a pci_dev data structure of agent detecting an error | |
492 | * @severity: error severity type | |
493 | * | |
494 | * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast | |
495 | * error detected message to all downstream drivers within a hierarchy in | |
496 | * question and return the returned code. | |
d885c6b7 | 497 | */ |
6c2b374d ZY |
498 | static pci_ers_result_t do_recovery(struct pcie_device *aerdev, |
499 | struct pci_dev *dev, | |
500 | int severity) | |
501 | { | |
502 | pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED; | |
503 | enum pci_channel_state state; | |
504 | ||
505 | if (severity == AER_FATAL) | |
506 | state = pci_channel_io_frozen; | |
507 | else | |
508 | state = pci_channel_io_normal; | |
509 | ||
510 | status = broadcast_error_message(dev, | |
511 | state, | |
512 | "error_detected", | |
513 | report_error_detected); | |
514 | ||
515 | if (severity == AER_FATAL) { | |
516 | result = reset_link(aerdev, dev); | |
517 | if (result != PCI_ERS_RESULT_RECOVERED) { | |
518 | /* TODO: Should panic here? */ | |
519 | return result; | |
520 | } | |
521 | } | |
522 | ||
523 | if (status == PCI_ERS_RESULT_CAN_RECOVER) | |
524 | status = broadcast_error_message(dev, | |
525 | state, | |
526 | "mmio_enabled", | |
527 | report_mmio_enabled); | |
528 | ||
529 | if (status == PCI_ERS_RESULT_NEED_RESET) { | |
530 | /* | |
531 | * TODO: Should call platform-specific | |
532 | * functions to reset slot before calling | |
533 | * drivers' slot_reset callbacks? | |
534 | */ | |
535 | status = broadcast_error_message(dev, | |
536 | state, | |
537 | "slot_reset", | |
538 | report_slot_reset); | |
539 | } | |
540 | ||
541 | if (status == PCI_ERS_RESULT_RECOVERED) | |
542 | broadcast_error_message(dev, | |
543 | state, | |
544 | "resume", | |
545 | report_resume); | |
546 | ||
547 | return status; | |
548 | } | |
549 | ||
550 | /** | |
551 | * handle_error_source - handle logging error into an event log | |
552 | * @aerdev: pointer to pcie_device data structure of the root port | |
553 | * @dev: pointer to pci_dev data structure of error source device | |
554 | * @info: comprehensive error information | |
555 | * | |
556 | * Invoked when an error being detected by Root Port. | |
d885c6b7 | 557 | */ |
c9a91883 | 558 | static void handle_error_source(struct pcie_device *aerdev, |
6c2b374d | 559 | struct pci_dev *dev, |
28eb27cf | 560 | struct aer_err_info *info) |
6c2b374d ZY |
561 | { |
562 | pci_ers_result_t status = 0; | |
563 | int pos; | |
564 | ||
28eb27cf | 565 | if (info->severity == AER_CORRECTABLE) { |
6c2b374d ZY |
566 | /* |
567 | * Correctable error does not need software intevention. | |
568 | * No need to go through error recovery process. | |
569 | */ | |
0927678f | 570 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
571 | if (pos) |
572 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
28eb27cf | 573 | info->status); |
6c2b374d | 574 | } else { |
28eb27cf | 575 | status = do_recovery(aerdev, dev, info->severity); |
6c2b374d | 576 | if (status == PCI_ERS_RESULT_RECOVERED) { |
531f254e BH |
577 | dev_printk(KERN_DEBUG, &dev->dev, "AER driver " |
578 | "successfully recovered\n"); | |
6c2b374d ZY |
579 | } else { |
580 | /* TODO: Should kernel panic here? */ | |
531f254e BH |
581 | dev_printk(KERN_DEBUG, &dev->dev, "AER driver didn't " |
582 | "recover\n"); | |
6c2b374d ZY |
583 | } |
584 | } | |
585 | } | |
586 | ||
587 | /** | |
588 | * aer_enable_rootport - enable Root Port's interrupts when receiving messages | |
589 | * @rpc: pointer to a Root Port data structure | |
590 | * | |
45e829ea | 591 | * Invoked when PCIe bus loads AER service driver. |
d885c6b7 | 592 | */ |
6c2b374d ZY |
593 | void aer_enable_rootport(struct aer_rpc *rpc) |
594 | { | |
595 | struct pci_dev *pdev = rpc->rpd->port; | |
596 | int pos, aer_pos; | |
597 | u16 reg16; | |
598 | u32 reg32; | |
599 | ||
39a53062 | 600 | pos = pci_pcie_cap(pdev); |
45e829ea | 601 | /* Clear PCIe Capability's Device Status */ |
6c2b374d ZY |
602 | pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, ®16); |
603 | pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16); | |
604 | ||
605 | /* Disable system error generation in response to error messages */ | |
606 | pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, ®16); | |
607 | reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK); | |
608 | pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16); | |
609 | ||
0927678f | 610 | aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
611 | /* Clear error status */ |
612 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32); | |
613 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32); | |
614 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32); | |
615 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32); | |
616 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32); | |
617 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32); | |
618 | ||
1f9f13c8 AP |
619 | /* |
620 | * Enable error reporting for the root port device and downstream port | |
621 | * devices. | |
622 | */ | |
623 | set_downstream_devices_error_reporting(pdev, true); | |
6c2b374d ZY |
624 | |
625 | /* Enable Root Port's interrupt in response to error messages */ | |
626 | pci_write_config_dword(pdev, | |
627 | aer_pos + PCI_ERR_ROOT_COMMAND, | |
628 | ROOT_PORT_INTR_ON_MESG_MASK); | |
629 | } | |
630 | ||
631 | /** | |
632 | * disable_root_aer - disable Root Port's interrupts when receiving messages | |
633 | * @rpc: pointer to a Root Port data structure | |
634 | * | |
45e829ea | 635 | * Invoked when PCIe bus unloads AER service driver. |
d885c6b7 | 636 | */ |
6c2b374d ZY |
637 | static void disable_root_aer(struct aer_rpc *rpc) |
638 | { | |
639 | struct pci_dev *pdev = rpc->rpd->port; | |
640 | u32 reg32; | |
641 | int pos; | |
642 | ||
1f9f13c8 AP |
643 | /* |
644 | * Disable error reporting for the root port device and downstream port | |
645 | * devices. | |
646 | */ | |
647 | set_downstream_devices_error_reporting(pdev, false); | |
648 | ||
0927678f | 649 | pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
650 | /* Disable Root's interrupt in response to error messages */ |
651 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0); | |
652 | ||
653 | /* Clear Root's error status reg */ | |
654 | pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32); | |
655 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32); | |
656 | } | |
657 | ||
658 | /** | |
659 | * get_e_source - retrieve an error source | |
660 | * @rpc: pointer to the root port which holds an error | |
661 | * | |
662 | * Invoked by DPC handler to consume an error. | |
d885c6b7 | 663 | */ |
c9a91883 | 664 | static struct aer_err_source *get_e_source(struct aer_rpc *rpc) |
6c2b374d ZY |
665 | { |
666 | struct aer_err_source *e_source; | |
667 | unsigned long flags; | |
668 | ||
669 | /* Lock access to Root error producer/consumer index */ | |
670 | spin_lock_irqsave(&rpc->e_lock, flags); | |
671 | if (rpc->prod_idx == rpc->cons_idx) { | |
672 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
673 | return NULL; | |
674 | } | |
675 | e_source = &rpc->e_sources[rpc->cons_idx]; | |
676 | rpc->cons_idx++; | |
677 | if (rpc->cons_idx == AER_ERROR_SOURCES_MAX) | |
678 | rpc->cons_idx = 0; | |
679 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
680 | ||
681 | return e_source; | |
682 | } | |
683 | ||
b1c089b7 HS |
684 | /** |
685 | * get_device_error_info - read error status from dev and store it to info | |
686 | * @dev: pointer to the device expected to have a error record | |
687 | * @info: pointer to structure to store the error record | |
688 | * | |
689 | * Return 1 on success, 0 on error. | |
690 | */ | |
6c2b374d ZY |
691 | static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) |
692 | { | |
e7a0d92b | 693 | int pos, temp; |
6c2b374d | 694 | |
1b4ffcf8 | 695 | info->status = 0; |
273024de | 696 | info->tlp_header_valid = 0; |
1b4ffcf8 | 697 | |
0927678f | 698 | pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); |
6c2b374d ZY |
699 | |
700 | /* The device might not support AER */ | |
701 | if (!pos) | |
b1c089b7 | 702 | return 1; |
6c2b374d ZY |
703 | |
704 | if (info->severity == AER_CORRECTABLE) { | |
705 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
706 | &info->status); | |
0d90c3ac HS |
707 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, |
708 | &info->mask); | |
709 | if (!(info->status & ~info->mask)) | |
b1c089b7 | 710 | return 0; |
6c2b374d ZY |
711 | } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE || |
712 | info->severity == AER_NONFATAL) { | |
713 | ||
714 | /* Link is still healthy for IO reads */ | |
715 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, | |
716 | &info->status); | |
0d90c3ac HS |
717 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, |
718 | &info->mask); | |
719 | if (!(info->status & ~info->mask)) | |
b1c089b7 | 720 | return 0; |
6c2b374d | 721 | |
e7a0d92b HS |
722 | /* Get First Error Pointer */ |
723 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp); | |
273024de | 724 | info->first_error = PCI_ERR_CAP_FEP(temp); |
e7a0d92b | 725 | |
6c2b374d | 726 | if (info->status & AER_LOG_TLP_MASKS) { |
273024de | 727 | info->tlp_header_valid = 1; |
6c2b374d ZY |
728 | pci_read_config_dword(dev, |
729 | pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0); | |
730 | pci_read_config_dword(dev, | |
731 | pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1); | |
732 | pci_read_config_dword(dev, | |
733 | pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2); | |
734 | pci_read_config_dword(dev, | |
735 | pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3); | |
736 | } | |
737 | } | |
738 | ||
b1c089b7 | 739 | return 1; |
6c2b374d ZY |
740 | } |
741 | ||
3d5505c5 ZY |
742 | static inline void aer_process_err_devices(struct pcie_device *p_device, |
743 | struct aer_err_info *e_info) | |
744 | { | |
745 | int i; | |
746 | ||
747 | if (!e_info->dev[0]) { | |
748 | dev_printk(KERN_DEBUG, &p_device->port->dev, | |
749 | "can't find device of ID%04x\n", | |
750 | e_info->id); | |
751 | } | |
752 | ||
b1c089b7 | 753 | /* Report all before handle them, not to lost records by reset etc. */ |
3d5505c5 | 754 | for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { |
b1c089b7 | 755 | if (get_device_error_info(e_info->dev[i], e_info)) |
3d5505c5 | 756 | aer_print_error(e_info->dev[i], e_info); |
b1c089b7 HS |
757 | } |
758 | for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { | |
759 | if (get_device_error_info(e_info->dev[i], e_info)) | |
760 | handle_error_source(p_device, e_info->dev[i], e_info); | |
3d5505c5 ZY |
761 | } |
762 | } | |
763 | ||
6c2b374d ZY |
764 | /** |
765 | * aer_isr_one_error - consume an error detected by root port | |
766 | * @p_device: pointer to error root port service device | |
767 | * @e_src: pointer to an error source | |
d885c6b7 | 768 | */ |
6c2b374d ZY |
769 | static void aer_isr_one_error(struct pcie_device *p_device, |
770 | struct aer_err_source *e_src) | |
771 | { | |
28eb27cf | 772 | struct aer_err_info *e_info; |
6c2b374d | 773 | int i; |
28eb27cf ZY |
774 | |
775 | /* struct aer_err_info might be big, so we allocate it with slab */ | |
776 | e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL); | |
777 | if (e_info == NULL) { | |
778 | dev_printk(KERN_DEBUG, &p_device->port->dev, | |
779 | "Can't allocate mem when processing AER errors\n"); | |
780 | return; | |
781 | } | |
6c2b374d ZY |
782 | |
783 | /* | |
784 | * There is a possibility that both correctable error and | |
785 | * uncorrectable error being logged. Report correctable error first. | |
786 | */ | |
787 | for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) { | |
788 | if (i > 4) | |
789 | break; | |
790 | if (!(e_src->status & i)) | |
791 | continue; | |
792 | ||
28eb27cf ZY |
793 | memset(e_info, 0, sizeof(struct aer_err_info)); |
794 | ||
6c2b374d ZY |
795 | /* Init comprehensive error information */ |
796 | if (i & PCI_ERR_ROOT_COR_RCV) { | |
28eb27cf ZY |
797 | e_info->id = ERR_COR_ID(e_src->id); |
798 | e_info->severity = AER_CORRECTABLE; | |
6c2b374d | 799 | } else { |
28eb27cf ZY |
800 | e_info->id = ERR_UNCOR_ID(e_src->id); |
801 | e_info->severity = ((e_src->status >> 6) & 1); | |
6c2b374d ZY |
802 | } |
803 | if (e_src->status & | |
804 | (PCI_ERR_ROOT_MULTI_COR_RCV | | |
805 | PCI_ERR_ROOT_MULTI_UNCOR_RCV)) | |
273024de | 806 | e_info->multi_error_valid = 1; |
28eb27cf | 807 | |
79e4b89b HS |
808 | aer_print_port_info(p_device->port, e_info); |
809 | ||
28eb27cf | 810 | find_source_device(p_device->port, e_info); |
3d5505c5 | 811 | aer_process_err_devices(p_device, e_info); |
6c2b374d | 812 | } |
28eb27cf ZY |
813 | |
814 | kfree(e_info); | |
6c2b374d ZY |
815 | } |
816 | ||
817 | /** | |
818 | * aer_isr - consume errors detected by root port | |
65f27f38 | 819 | * @work: definition of this work item |
6c2b374d ZY |
820 | * |
821 | * Invoked, as DPC, when root port records new detected error | |
d885c6b7 | 822 | */ |
65f27f38 | 823 | void aer_isr(struct work_struct *work) |
6c2b374d | 824 | { |
65f27f38 DH |
825 | struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler); |
826 | struct pcie_device *p_device = rpc->rpd; | |
6c2b374d ZY |
827 | struct aer_err_source *e_src; |
828 | ||
829 | mutex_lock(&rpc->rpc_mutex); | |
830 | e_src = get_e_source(rpc); | |
831 | while (e_src) { | |
832 | aer_isr_one_error(p_device, e_src); | |
833 | e_src = get_e_source(rpc); | |
834 | } | |
835 | mutex_unlock(&rpc->rpc_mutex); | |
836 | ||
837 | wake_up(&rpc->wait_release); | |
838 | } | |
839 | ||
840 | /** | |
841 | * aer_delete_rootport - disable root port aer and delete service data | |
842 | * @rpc: pointer to a root port device being deleted | |
843 | * | |
844 | * Invoked when AER service unloaded on a specific Root Port | |
d885c6b7 | 845 | */ |
6c2b374d ZY |
846 | void aer_delete_rootport(struct aer_rpc *rpc) |
847 | { | |
848 | /* Disable root port AER itself */ | |
849 | disable_root_aer(rpc); | |
850 | ||
851 | kfree(rpc); | |
852 | } | |
853 | ||
854 | /** | |
855 | * aer_init - provide AER initialization | |
856 | * @dev: pointer to AER pcie device | |
857 | * | |
858 | * Invoked when AER service driver is loaded. | |
d885c6b7 | 859 | */ |
6c2b374d ZY |
860 | int aer_init(struct pcie_device *dev) |
861 | { | |
05843961 MD |
862 | if (dev->port->aer_firmware_first) { |
863 | dev_printk(KERN_DEBUG, &dev->device, | |
864 | "PCIe errors handled by platform firmware.\n"); | |
865 | goto out; | |
866 | } | |
867 | ||
868 | if (aer_osc_setup(dev)) | |
869 | goto out; | |
6c2b374d | 870 | |
b1c089b7 | 871 | return 0; |
05843961 MD |
872 | out: |
873 | if (forceload) { | |
874 | dev_printk(KERN_DEBUG, &dev->device, | |
875 | "aerdrv forceload requested.\n"); | |
876 | dev->port->aer_firmware_first = 0; | |
877 | return 0; | |
878 | } | |
879 | return -ENXIO; | |
6c2b374d | 880 | } |