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