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 module_param(forceload, bool, 0);
30
31 #define PCI_CFG_SPACE_SIZE (0x100)
32 int pci_find_aer_capability(struct pci_dev *dev)
33 {
34 int pos;
35 u32 reg32 = 0;
36
37 /* Check if it's a pci-express device */
38 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
39 if (!pos)
40 return 0;
41
42 /* Check if it supports pci-express AER */
43 pos = PCI_CFG_SPACE_SIZE;
44 while (pos) {
45 if (pci_read_config_dword(dev, pos, ®32))
46 return 0;
47
48 /* some broken boards return ~0 */
49 if (reg32 == 0xffffffff)
50 return 0;
51
52 if (PCI_EXT_CAP_ID(reg32) == PCI_EXT_CAP_ID_ERR)
53 break;
54
55 pos = reg32 >> 20;
56 }
57
58 return pos;
59 }
60
61 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
62 {
63 u16 reg16 = 0;
64 int pos;
65
66 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
67 if (!pos)
68 return -EIO;
69
70 pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16);
71 reg16 = reg16 |
72 PCI_EXP_DEVCTL_CERE |
73 PCI_EXP_DEVCTL_NFERE |
74 PCI_EXP_DEVCTL_FERE |
75 PCI_EXP_DEVCTL_URRE;
76 pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
77 reg16);
78 return 0;
79 }
80
81 int pci_disable_pcie_error_reporting(struct pci_dev *dev)
82 {
83 u16 reg16 = 0;
84 int pos;
85
86 pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
87 if (!pos)
88 return -EIO;
89
90 pci_read_config_word(dev, pos+PCI_EXP_DEVCTL, ®16);
91 reg16 = reg16 & ~(PCI_EXP_DEVCTL_CERE |
92 PCI_EXP_DEVCTL_NFERE |
93 PCI_EXP_DEVCTL_FERE |
94 PCI_EXP_DEVCTL_URRE);
95 pci_write_config_word(dev, pos+PCI_EXP_DEVCTL,
96 reg16);
97 return 0;
98 }
99
100 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
101 {
102 int pos;
103 u32 status, mask;
104
105 pos = pci_find_aer_capability(dev);
106 if (!pos)
107 return -EIO;
108
109 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
110 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
111 if (dev->error_state == pci_channel_io_normal)
112 status &= ~mask; /* Clear corresponding nonfatal bits */
113 else
114 status &= mask; /* Clear corresponding fatal bits */
115 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
116
117 return 0;
118 }
119
120 int pci_cleanup_aer_correct_error_status(struct pci_dev *dev)
121 {
122 int pos;
123 u32 status;
124
125 pos = pci_find_aer_capability(dev);
126 if (!pos)
127 return -EIO;
128
129 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
130 pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status);
131
132 return 0;
133 }
134
135 static int find_device_iter(struct device *device, void *data)
136 {
137 struct pci_dev *dev;
138 u16 id = *(unsigned long *)data;
139 u8 secondary, subordinate, d_bus = id >> 8;
140
141 if (device->bus == &pci_bus_type) {
142 dev = to_pci_dev(device);
143 if (id == ((dev->bus->number << 8) | dev->devfn)) {
144 /*
145 * Device ID match
146 */
147 *(unsigned long*)data = (unsigned long)device;
148 return 1;
149 }
150
151 /*
152 * If device is P2P, check if it is an upstream?
153 */
154 if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
155 pci_read_config_byte(dev, PCI_SECONDARY_BUS,
156 &secondary);
157 pci_read_config_byte(dev, PCI_SUBORDINATE_BUS,
158 &subordinate);
159 if (d_bus >= secondary && d_bus <= subordinate) {
160 *(unsigned long*)data = (unsigned long)device;
161 return 1;
162 }
163 }
164 }
165
166 return 0;
167 }
168
169 /**
170 * find_source_device - search through device hierarchy for source device
171 * @parent: pointer to Root Port pci_dev data structure
172 * @id: device ID of agent who sends an error message to this Root Port
173 *
174 * Invoked when error is detected at the Root Port.
175 */
176 static struct device* find_source_device(struct pci_dev *parent, u16 id)
177 {
178 struct pci_dev *dev = parent;
179 struct device *device;
180 unsigned long device_addr;
181 int status;
182
183 /* Is Root Port an agent that sends error message? */
184 if (id == ((dev->bus->number << 8) | dev->devfn))
185 return &dev->dev;
186
187 do {
188 device_addr = id;
189 if ((status = device_for_each_child(&dev->dev,
190 &device_addr, find_device_iter))) {
191 device = (struct device*)device_addr;
192 dev = to_pci_dev(device);
193 if (id == ((dev->bus->number << 8) | dev->devfn))
194 return device;
195 }
196 }while (status);
197
198 return NULL;
199 }
200
201 static void report_error_detected(struct pci_dev *dev, void *data)
202 {
203 pci_ers_result_t vote;
204 struct pci_error_handlers *err_handler;
205 struct aer_broadcast_data *result_data;
206 result_data = (struct aer_broadcast_data *) data;
207
208 dev->error_state = result_data->state;
209
210 if (!dev->driver ||
211 !dev->driver->err_handler ||
212 !dev->driver->err_handler->error_detected) {
213 if (result_data->state == pci_channel_io_frozen &&
214 !(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) {
215 /*
216 * In case of fatal recovery, if one of down-
217 * stream device has no driver. We might be
218 * unable to recover because a later insmod
219 * of a driver for this device is unaware of
220 * its hw state.
221 */
222 printk(KERN_DEBUG "Device ID[%s] has %s\n",
223 dev->dev.bus_id, (dev->driver) ?
224 "no AER-aware driver" : "no driver");
225 }
226 return;
227 }
228
229 err_handler = dev->driver->err_handler;
230 vote = err_handler->error_detected(dev, result_data->state);
231 result_data->result = merge_result(result_data->result, vote);
232 return;
233 }
234
235 static void report_mmio_enabled(struct pci_dev *dev, void *data)
236 {
237 pci_ers_result_t vote;
238 struct pci_error_handlers *err_handler;
239 struct aer_broadcast_data *result_data;
240 result_data = (struct aer_broadcast_data *) data;
241
242 if (!dev->driver ||
243 !dev->driver->err_handler ||
244 !dev->driver->err_handler->mmio_enabled)
245 return;
246
247 err_handler = dev->driver->err_handler;
248 vote = err_handler->mmio_enabled(dev);
249 result_data->result = merge_result(result_data->result, vote);
250 return;
251 }
252
253 static void report_slot_reset(struct pci_dev *dev, void *data)
254 {
255 pci_ers_result_t vote;
256 struct pci_error_handlers *err_handler;
257 struct aer_broadcast_data *result_data;
258 result_data = (struct aer_broadcast_data *) data;
259
260 if (!dev->driver ||
261 !dev->driver->err_handler ||
262 !dev->driver->err_handler->slot_reset)
263 return;
264
265 err_handler = dev->driver->err_handler;
266 vote = err_handler->slot_reset(dev);
267 result_data->result = merge_result(result_data->result, vote);
268 return;
269 }
270
271 static void report_resume(struct pci_dev *dev, void *data)
272 {
273 struct pci_error_handlers *err_handler;
274
275 dev->error_state = pci_channel_io_normal;
276
277 if (!dev->driver ||
278 !dev->driver->err_handler ||
279 !dev->driver->err_handler->slot_reset)
280 return;
281
282 err_handler = dev->driver->err_handler;
283 err_handler->resume(dev);
284 return;
285 }
286
287 /**
288 * broadcast_error_message - handle message broadcast to downstream drivers
289 * @dev: pointer to from where in a hierarchy message is broadcasted down
290 * @state: error state
291 * @error_mesg: message to print
292 * @cb: callback to be broadcasted
293 *
294 * Invoked during error recovery process. Once being invoked, the content
295 * of error severity will be broadcasted to all downstream drivers in a
296 * hierarchy in question.
297 */
298 static pci_ers_result_t broadcast_error_message(struct pci_dev *dev,
299 enum pci_channel_state state,
300 char *error_mesg,
301 void (*cb)(struct pci_dev *, void *))
302 {
303 struct aer_broadcast_data result_data;
304
305 printk(KERN_DEBUG "Broadcast %s message\n", error_mesg);
306 result_data.state = state;
307 if (cb == report_error_detected)
308 result_data.result = PCI_ERS_RESULT_CAN_RECOVER;
309 else
310 result_data.result = PCI_ERS_RESULT_RECOVERED;
311
312 if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE) {
313 /*
314 * If the error is reported by a bridge, we think this error
315 * is related to the downstream link of the bridge, so we
316 * do error recovery on all subordinates of the bridge instead
317 * of the bridge and clear the error status of the bridge.
318 */
319 if (cb == report_error_detected)
320 dev->error_state = state;
321 pci_walk_bus(dev->subordinate, cb, &result_data);
322 if (cb == report_resume) {
323 pci_cleanup_aer_uncorrect_error_status(dev);
324 dev->error_state = pci_channel_io_normal;
325 }
326 }
327 else {
328 /*
329 * If the error is reported by an end point, we think this
330 * error is related to the upstream link of the end point.
331 */
332 pci_walk_bus(dev->bus, cb, &result_data);
333 }
334
335 return result_data.result;
336 }
337
338 struct find_aer_service_data {
339 struct pcie_port_service_driver *aer_driver;
340 int is_downstream;
341 };
342
343 static int find_aer_service_iter(struct device *device, void *data)
344 {
345 struct device_driver *driver;
346 struct pcie_port_service_driver *service_driver;
347 struct pcie_device *pcie_dev;
348 struct find_aer_service_data *result;
349
350 result = (struct find_aer_service_data *) data;
351
352 if (device->bus == &pcie_port_bus_type) {
353 pcie_dev = to_pcie_device(device);
354 if (pcie_dev->id.port_type == PCIE_SW_DOWNSTREAM_PORT)
355 result->is_downstream = 1;
356
357 driver = device->driver;
358 if (driver) {
359 service_driver = to_service_driver(driver);
360 if (service_driver->id_table->service_type ==
361 PCIE_PORT_SERVICE_AER) {
362 result->aer_driver = service_driver;
363 return 1;
364 }
365 }
366 }
367
368 return 0;
369 }
370
371 static void find_aer_service(struct pci_dev *dev,
372 struct find_aer_service_data *data)
373 {
374 int retval;
375 retval = device_for_each_child(&dev->dev, data, find_aer_service_iter);
376 }
377
378 static pci_ers_result_t reset_link(struct pcie_device *aerdev,
379 struct pci_dev *dev)
380 {
381 struct pci_dev *udev;
382 pci_ers_result_t status;
383 struct find_aer_service_data data;
384
385 if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)
386 udev = dev;
387 else
388 udev= dev->bus->self;
389
390 data.is_downstream = 0;
391 data.aer_driver = NULL;
392 find_aer_service(udev, &data);
393
394 /*
395 * Use the aer driver of the error agent firstly.
396 * If it hasn't the aer driver, use the root port's
397 */
398 if (!data.aer_driver || !data.aer_driver->reset_link) {
399 if (data.is_downstream &&
400 aerdev->device.driver &&
401 to_service_driver(aerdev->device.driver)->reset_link) {
402 data.aer_driver =
403 to_service_driver(aerdev->device.driver);
404 } else {
405 printk(KERN_DEBUG "No link-reset support to Device ID"
406 "[%s]\n",
407 dev->dev.bus_id);
408 return PCI_ERS_RESULT_DISCONNECT;
409 }
410 }
411
412 status = data.aer_driver->reset_link(udev);
413 if (status != PCI_ERS_RESULT_RECOVERED) {
414 printk(KERN_DEBUG "Link reset at upstream Device ID"
415 "[%s] failed\n",
416 udev->dev.bus_id);
417 return PCI_ERS_RESULT_DISCONNECT;
418 }
419
420 return status;
421 }
422
423 /**
424 * do_recovery - handle nonfatal/fatal error recovery process
425 * @aerdev: pointer to a pcie_device data structure of root port
426 * @dev: pointer to a pci_dev data structure of agent detecting an error
427 * @severity: error severity type
428 *
429 * Invoked when an error is nonfatal/fatal. Once being invoked, broadcast
430 * error detected message to all downstream drivers within a hierarchy in
431 * question and return the returned code.
432 */
433 static pci_ers_result_t do_recovery(struct pcie_device *aerdev,
434 struct pci_dev *dev,
435 int severity)
436 {
437 pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
438 enum pci_channel_state state;
439
440 if (severity == AER_FATAL)
441 state = pci_channel_io_frozen;
442 else
443 state = pci_channel_io_normal;
444
445 status = broadcast_error_message(dev,
446 state,
447 "error_detected",
448 report_error_detected);
449
450 if (severity == AER_FATAL) {
451 result = reset_link(aerdev, dev);
452 if (result != PCI_ERS_RESULT_RECOVERED) {
453 /* TODO: Should panic here? */
454 return result;
455 }
456 }
457
458 if (status == PCI_ERS_RESULT_CAN_RECOVER)
459 status = broadcast_error_message(dev,
460 state,
461 "mmio_enabled",
462 report_mmio_enabled);
463
464 if (status == PCI_ERS_RESULT_NEED_RESET) {
465 /*
466 * TODO: Should call platform-specific
467 * functions to reset slot before calling
468 * drivers' slot_reset callbacks?
469 */
470 status = broadcast_error_message(dev,
471 state,
472 "slot_reset",
473 report_slot_reset);
474 }
475
476 if (status == PCI_ERS_RESULT_RECOVERED)
477 broadcast_error_message(dev,
478 state,
479 "resume",
480 report_resume);
481
482 return status;
483 }
484
485 /**
486 * handle_error_source - handle logging error into an event log
487 * @aerdev: pointer to pcie_device data structure of the root port
488 * @dev: pointer to pci_dev data structure of error source device
489 * @info: comprehensive error information
490 *
491 * Invoked when an error being detected by Root Port.
492 */
493 static void handle_error_source(struct pcie_device * aerdev,
494 struct pci_dev *dev,
495 struct aer_err_info info)
496 {
497 pci_ers_result_t status = 0;
498 int pos;
499
500 if (info.severity == AER_CORRECTABLE) {
501 /*
502 * Correctable error does not need software intevention.
503 * No need to go through error recovery process.
504 */
505 pos = pci_find_aer_capability(dev);
506 if (pos)
507 pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
508 info.status);
509 } else {
510 status = do_recovery(aerdev, dev, info.severity);
511 if (status == PCI_ERS_RESULT_RECOVERED) {
512 printk(KERN_DEBUG "AER driver successfully recovered\n");
513 } else {
514 /* TODO: Should kernel panic here? */
515 printk(KERN_DEBUG "AER driver didn't recover\n");
516 }
517 }
518 }
519
520 /**
521 * aer_enable_rootport - enable Root Port's interrupts when receiving messages
522 * @rpc: pointer to a Root Port data structure
523 *
524 * Invoked when PCIE bus loads AER service driver.
525 */
526 void aer_enable_rootport(struct aer_rpc *rpc)
527 {
528 struct pci_dev *pdev = rpc->rpd->port;
529 int pos, aer_pos;
530 u16 reg16;
531 u32 reg32;
532
533 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
534 /* Clear PCIE Capability's Device Status */
535 pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, ®16);
536 pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);
537
538 /* Disable system error generation in response to error messages */
539 pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, ®16);
540 reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
541 pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);
542
543 aer_pos = pci_find_aer_capability(pdev);
544 /* Clear error status */
545 pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32);
546 pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
547 pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32);
548 pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
549 pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32);
550 pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
551
552 /* Enable Root Port device reporting error itself */
553 pci_read_config_word(pdev, pos+PCI_EXP_DEVCTL, ®16);
554 reg16 = reg16 |
555 PCI_EXP_DEVCTL_CERE |
556 PCI_EXP_DEVCTL_NFERE |
557 PCI_EXP_DEVCTL_FERE |
558 PCI_EXP_DEVCTL_URRE;
559 pci_write_config_word(pdev, pos+PCI_EXP_DEVCTL,
560 reg16);
561
562 /* Enable Root Port's interrupt in response to error messages */
563 pci_write_config_dword(pdev,
564 aer_pos + PCI_ERR_ROOT_COMMAND,
565 ROOT_PORT_INTR_ON_MESG_MASK);
566 }
567
568 /**
569 * disable_root_aer - disable Root Port's interrupts when receiving messages
570 * @rpc: pointer to a Root Port data structure
571 *
572 * Invoked when PCIE bus unloads AER service driver.
573 */
574 static void disable_root_aer(struct aer_rpc *rpc)
575 {
576 struct pci_dev *pdev = rpc->rpd->port;
577 u32 reg32;
578 int pos;
579
580 pos = pci_find_aer_capability(pdev);
581 /* Disable Root's interrupt in response to error messages */
582 pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, 0);
583
584 /* Clear Root's error status reg */
585 pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32);
586 pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
587 }
588
589 /**
590 * get_e_source - retrieve an error source
591 * @rpc: pointer to the root port which holds an error
592 *
593 * Invoked by DPC handler to consume an error.
594 */
595 static struct aer_err_source* get_e_source(struct aer_rpc *rpc)
596 {
597 struct aer_err_source *e_source;
598 unsigned long flags;
599
600 /* Lock access to Root error producer/consumer index */
601 spin_lock_irqsave(&rpc->e_lock, flags);
602 if (rpc->prod_idx == rpc->cons_idx) {
603 spin_unlock_irqrestore(&rpc->e_lock, flags);
604 return NULL;
605 }
606 e_source = &rpc->e_sources[rpc->cons_idx];
607 rpc->cons_idx++;
608 if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
609 rpc->cons_idx = 0;
610 spin_unlock_irqrestore(&rpc->e_lock, flags);
611
612 return e_source;
613 }
614
615 static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
616 {
617 int pos;
618
619 pos = pci_find_aer_capability(dev);
620
621 /* The device might not support AER */
622 if (!pos)
623 return AER_SUCCESS;
624
625 if (info->severity == AER_CORRECTABLE) {
626 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
627 &info->status);
628 if (!(info->status & ERR_CORRECTABLE_ERROR_MASK))
629 return AER_UNSUCCESS;
630 } else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
631 info->severity == AER_NONFATAL) {
632
633 /* Link is still healthy for IO reads */
634 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
635 &info->status);
636 if (!(info->status & ERR_UNCORRECTABLE_ERROR_MASK))
637 return AER_UNSUCCESS;
638
639 if (info->status & AER_LOG_TLP_MASKS) {
640 info->flags |= AER_TLP_HEADER_VALID_FLAG;
641 pci_read_config_dword(dev,
642 pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
643 pci_read_config_dword(dev,
644 pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
645 pci_read_config_dword(dev,
646 pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
647 pci_read_config_dword(dev,
648 pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
649 }
650 }
651
652 return AER_SUCCESS;
653 }
654
655 /**
656 * aer_isr_one_error - consume an error detected by root port
657 * @p_device: pointer to error root port service device
658 * @e_src: pointer to an error source
659 */
660 static void aer_isr_one_error(struct pcie_device *p_device,
661 struct aer_err_source *e_src)
662 {
663 struct device *s_device;
664 struct aer_err_info e_info = {0, 0, 0,};
665 int i;
666 u16 id;
667
668 /*
669 * There is a possibility that both correctable error and
670 * uncorrectable error being logged. Report correctable error first.
671 */
672 for (i = 1; i & ROOT_ERR_STATUS_MASKS ; i <<= 2) {
673 if (i > 4)
674 break;
675 if (!(e_src->status & i))
676 continue;
677
678 /* Init comprehensive error information */
679 if (i & PCI_ERR_ROOT_COR_RCV) {
680 id = ERR_COR_ID(e_src->id);
681 e_info.severity = AER_CORRECTABLE;
682 } else {
683 id = ERR_UNCOR_ID(e_src->id);
684 e_info.severity = ((e_src->status >> 6) & 1);
685 }
686 if (e_src->status &
687 (PCI_ERR_ROOT_MULTI_COR_RCV |
688 PCI_ERR_ROOT_MULTI_UNCOR_RCV))
689 e_info.flags |= AER_MULTI_ERROR_VALID_FLAG;
690 if (!(s_device = find_source_device(p_device->port, id))) {
691 printk(KERN_DEBUG "%s->can't find device of ID%04x\n",
692 __FUNCTION__, id);
693 continue;
694 }
695 if (get_device_error_info(to_pci_dev(s_device), &e_info) ==
696 AER_SUCCESS) {
697 aer_print_error(to_pci_dev(s_device), &e_info);
698 handle_error_source(p_device,
699 to_pci_dev(s_device),
700 e_info);
701 }
702 }
703 }
704
705 /**
706 * aer_isr - consume errors detected by root port
707 * @work: definition of this work item
708 *
709 * Invoked, as DPC, when root port records new detected error
710 */
711 void aer_isr(struct work_struct *work)
712 {
713 struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
714 struct pcie_device *p_device = rpc->rpd;
715 struct aer_err_source *e_src;
716
717 mutex_lock(&rpc->rpc_mutex);
718 e_src = get_e_source(rpc);
719 while (e_src) {
720 aer_isr_one_error(p_device, e_src);
721 e_src = get_e_source(rpc);
722 }
723 mutex_unlock(&rpc->rpc_mutex);
724
725 wake_up(&rpc->wait_release);
726 }
727
728 /**
729 * aer_delete_rootport - disable root port aer and delete service data
730 * @rpc: pointer to a root port device being deleted
731 *
732 * Invoked when AER service unloaded on a specific Root Port
733 */
734 void aer_delete_rootport(struct aer_rpc *rpc)
735 {
736 /* Disable root port AER itself */
737 disable_root_aer(rpc);
738
739 kfree(rpc);
740 }
741
742 /**
743 * aer_init - provide AER initialization
744 * @dev: pointer to AER pcie device
745 *
746 * Invoked when AER service driver is loaded.
747 */
748 int aer_init(struct pcie_device *dev)
749 {
750 if (aer_osc_setup(dev) && !forceload)
751 return -ENXIO;
752
753 return AER_SUCCESS;
754 }
755
756 EXPORT_SYMBOL_GPL(pci_find_aer_capability);
757 EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
758 EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
759 EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
760 EXPORT_SYMBOL_GPL(pci_cleanup_aer_correct_error_status);
761
762
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