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1/*
2 * (C) 2005, 2006 Linux Networx (http://lnxi.com)
3 * This file may be distributed under the terms of the
4 * GNU General Public License.
5 *
6 * Written Doug Thompson <norsk5@xmission.com>
7 *
8 */
9#include <linux/module.h>
10#include <linux/edac.h>
11#include <linux/slab.h>
12#include <linux/ctype.h>
13
14#include "edac_pci.h"
15#include "edac_module.h"
16
17#define EDAC_PCI_SYMLINK "device"
18
19/* data variables exported via sysfs */
20static int check_pci_errors; /* default NO check PCI parity */
21static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
22static int edac_pci_log_pe = 1; /* log PCI parity errors */
23static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
24static int edac_pci_poll_msec = 1000; /* one second workq period */
25
26static atomic_t pci_parity_count = ATOMIC_INIT(0);
27static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
28
29static struct kobject *edac_pci_top_main_kobj;
30static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
31
32/* getter functions for the data variables */
33int edac_pci_get_check_errors(void)
34{
35 return check_pci_errors;
36}
37
38static int edac_pci_get_log_pe(void)
39{
40 return edac_pci_log_pe;
41}
42
43static int edac_pci_get_log_npe(void)
44{
45 return edac_pci_log_npe;
46}
47
48static int edac_pci_get_panic_on_pe(void)
49{
50 return edac_pci_panic_on_pe;
51}
52
53int edac_pci_get_poll_msec(void)
54{
55 return edac_pci_poll_msec;
56}
57
58/**************************** EDAC PCI sysfs instance *******************/
59static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
60{
61 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
62}
63
64static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
65 char *data)
66{
67 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
68}
69
70#define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
71#define to_instance_attr(a) container_of(a, struct instance_attribute, attr)
72
73/* DEVICE instance kobject release() function */
74static void edac_pci_instance_release(struct kobject *kobj)
75{
76 struct edac_pci_ctl_info *pci;
77
78 edac_dbg(0, "\n");
79
80 /* Form pointer to containing struct, the pci control struct */
81 pci = to_instance(kobj);
82
83 /* decrement reference count on top main kobj */
84 kobject_put(edac_pci_top_main_kobj);
85
86 kfree(pci); /* Free the control struct */
87}
88
89/* instance specific attribute structure */
90struct instance_attribute {
91 struct attribute attr;
92 ssize_t(*show) (struct edac_pci_ctl_info *, char *);
93 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
94};
95
96/* Function to 'show' fields from the edac_pci 'instance' structure */
97static ssize_t edac_pci_instance_show(struct kobject *kobj,
98 struct attribute *attr, char *buffer)
99{
100 struct edac_pci_ctl_info *pci = to_instance(kobj);
101 struct instance_attribute *instance_attr = to_instance_attr(attr);
102
103 if (instance_attr->show)
104 return instance_attr->show(pci, buffer);
105 return -EIO;
106}
107
108/* Function to 'store' fields into the edac_pci 'instance' structure */
109static ssize_t edac_pci_instance_store(struct kobject *kobj,
110 struct attribute *attr,
111 const char *buffer, size_t count)
112{
113 struct edac_pci_ctl_info *pci = to_instance(kobj);
114 struct instance_attribute *instance_attr = to_instance_attr(attr);
115
116 if (instance_attr->store)
117 return instance_attr->store(pci, buffer, count);
118 return -EIO;
119}
120
121/* fs_ops table */
122static const struct sysfs_ops pci_instance_ops = {
123 .show = edac_pci_instance_show,
124 .store = edac_pci_instance_store
125};
126
127#define INSTANCE_ATTR(_name, _mode, _show, _store) \
128static struct instance_attribute attr_instance_##_name = { \
129 .attr = {.name = __stringify(_name), .mode = _mode }, \
130 .show = _show, \
131 .store = _store, \
132};
133
134INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
135INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
136
137/* pci instance attributes */
138static struct attribute *pci_instance_attrs[] = {
139 &attr_instance_pe_count.attr,
140 &attr_instance_npe_count.attr,
141 NULL
142};
143ATTRIBUTE_GROUPS(pci_instance);
144
145/* the ktype for a pci instance */
146static struct kobj_type ktype_pci_instance = {
147 .release = edac_pci_instance_release,
148 .sysfs_ops = &pci_instance_ops,
149 .default_groups = pci_instance_groups,
150};
151
152/*
153 * edac_pci_create_instance_kobj
154 *
155 * construct one EDAC PCI instance's kobject for use
156 */
157static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
158{
159 struct kobject *main_kobj;
160 int err;
161
162 edac_dbg(0, "\n");
163
164 /* First bump the ref count on the top main kobj, which will
165 * track the number of PCI instances we have, and thus nest
166 * properly on keeping the module loaded
167 */
168 main_kobj = kobject_get(edac_pci_top_main_kobj);
169 if (!main_kobj) {
170 err = -ENODEV;
171 goto error_out;
172 }
173
174 /* And now register this new kobject under the main kobj */
175 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
176 edac_pci_top_main_kobj, "pci%d", idx);
177 if (err != 0) {
178 edac_dbg(2, "failed to register instance pci%d\n", idx);
179 kobject_put(edac_pci_top_main_kobj);
180 goto error_out;
181 }
182
183 kobject_uevent(&pci->kobj, KOBJ_ADD);
184 edac_dbg(1, "Register instance 'pci%d' kobject\n", idx);
185
186 return 0;
187
188 /* Error unwind statck */
189error_out:
190 return err;
191}
192
193/*
194 * edac_pci_unregister_sysfs_instance_kobj
195 *
196 * unregister the kobj for the EDAC PCI instance
197 */
198static void edac_pci_unregister_sysfs_instance_kobj(
199 struct edac_pci_ctl_info *pci)
200{
201 edac_dbg(0, "\n");
202
203 /* Unregister the instance kobject and allow its release
204 * function release the main reference count and then
205 * kfree the memory
206 */
207 kobject_put(&pci->kobj);
208}
209
210/***************************** EDAC PCI sysfs root **********************/
211#define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj)
212#define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr)
213
214/* simple show/store functions for attributes */
215static ssize_t edac_pci_int_show(void *ptr, char *buffer)
216{
217 int *value = ptr;
218 return sprintf(buffer, "%d\n", *value);
219}
220
221static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
222{
223 int *value = ptr;
224
225 if (isdigit(*buffer))
226 *value = simple_strtoul(buffer, NULL, 0);
227
228 return count;
229}
230
231struct edac_pci_dev_attribute {
232 struct attribute attr;
233 void *value;
234 ssize_t(*show) (void *, char *);
235 ssize_t(*store) (void *, const char *, size_t);
236};
237
238/* Set of show/store abstract level functions for PCI Parity object */
239static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
240 char *buffer)
241{
242 struct edac_pci_dev_attribute *edac_pci_dev;
243 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
244
245 if (edac_pci_dev->show)
246 return edac_pci_dev->show(edac_pci_dev->value, buffer);
247 return -EIO;
248}
249
250static ssize_t edac_pci_dev_store(struct kobject *kobj,
251 struct attribute *attr, const char *buffer,
252 size_t count)
253{
254 struct edac_pci_dev_attribute *edac_pci_dev;
255 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
256
257 if (edac_pci_dev->store)
258 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
259 return -EIO;
260}
261
262static const struct sysfs_ops edac_pci_sysfs_ops = {
263 .show = edac_pci_dev_show,
264 .store = edac_pci_dev_store
265};
266
267#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
268static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
269 .attr = {.name = __stringify(_name), .mode = _mode }, \
270 .value = &_name, \
271 .show = _show, \
272 .store = _store, \
273};
274
275#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \
276static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
277 .attr = {.name = __stringify(_name), .mode = _mode }, \
278 .value = _data, \
279 .show = _show, \
280 .store = _store, \
281};
282
283/* PCI Parity control files */
284EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
285 edac_pci_int_store);
286EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
287 edac_pci_int_store);
288EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
289 edac_pci_int_store);
290EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
291 edac_pci_int_store);
292EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
293EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
294
295/* Base Attributes of the memory ECC object */
296static struct attribute *edac_pci_attrs[] = {
297 &edac_pci_attr_check_pci_errors.attr,
298 &edac_pci_attr_edac_pci_log_pe.attr,
299 &edac_pci_attr_edac_pci_log_npe.attr,
300 &edac_pci_attr_edac_pci_panic_on_pe.attr,
301 &edac_pci_attr_pci_parity_count.attr,
302 &edac_pci_attr_pci_nonparity_count.attr,
303 NULL,
304};
305ATTRIBUTE_GROUPS(edac_pci);
306
307/*
308 * edac_pci_release_main_kobj
309 *
310 * This release function is called when the reference count to the
311 * passed kobj goes to zero.
312 *
313 * This kobj is the 'main' kobject that EDAC PCI instances
314 * link to, and thus provide for proper nesting counts
315 */
316static void edac_pci_release_main_kobj(struct kobject *kobj)
317{
318 edac_dbg(0, "here to module_put(THIS_MODULE)\n");
319
320 kfree(kobj);
321
322 /* last reference to top EDAC PCI kobject has been removed,
323 * NOW release our ref count on the core module
324 */
325 module_put(THIS_MODULE);
326}
327
328/* ktype struct for the EDAC PCI main kobj */
329static struct kobj_type ktype_edac_pci_main_kobj = {
330 .release = edac_pci_release_main_kobj,
331 .sysfs_ops = &edac_pci_sysfs_ops,
332 .default_groups = edac_pci_groups,
333};
334
335/**
336 * edac_pci_main_kobj_setup: Setup the sysfs for EDAC PCI attributes.
337 */
338static int edac_pci_main_kobj_setup(void)
339{
340 int err = -ENODEV;
341 const struct bus_type *edac_subsys;
342 struct device *dev_root;
343
344 edac_dbg(0, "\n");
345
346 /* check and count if we have already created the main kobject */
347 if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
348 return 0;
349
350 /* First time, so create the main kobject and its
351 * controls and attributes
352 */
353 edac_subsys = edac_get_sysfs_subsys();
354
355 /* Bump the reference count on this module to ensure the
356 * modules isn't unloaded until we deconstruct the top
357 * level main kobj for EDAC PCI
358 */
359 if (!try_module_get(THIS_MODULE)) {
360 edac_dbg(1, "try_module_get() failed\n");
361 goto decrement_count_fail;
362 }
363
364 edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
365 if (!edac_pci_top_main_kobj) {
366 edac_dbg(1, "Failed to allocate\n");
367 err = -ENOMEM;
368 goto kzalloc_fail;
369 }
370
371 /* Instanstiate the pci object */
372 dev_root = bus_get_dev_root(edac_subsys);
373 if (dev_root) {
374 err = kobject_init_and_add(edac_pci_top_main_kobj,
375 &ktype_edac_pci_main_kobj,
376 &dev_root->kobj, "pci");
377 put_device(dev_root);
378 }
379 if (err) {
380 edac_dbg(1, "Failed to register '.../edac/pci'\n");
381 goto kobject_init_and_add_fail;
382 }
383
384 /* At this point, to 'release' the top level kobject
385 * for EDAC PCI, then edac_pci_main_kobj_teardown()
386 * must be used, for resources to be cleaned up properly
387 */
388 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
389 edac_dbg(1, "Registered '.../edac/pci' kobject\n");
390
391 return 0;
392
393 /* Error unwind statck */
394kobject_init_and_add_fail:
395 kobject_put(edac_pci_top_main_kobj);
396
397kzalloc_fail:
398 module_put(THIS_MODULE);
399
400decrement_count_fail:
401 /* if are on this error exit, nothing to tear down */
402 atomic_dec(&edac_pci_sysfs_refcount);
403
404 return err;
405}
406
407/*
408 * edac_pci_main_kobj_teardown()
409 *
410 * if no longer linked (needed) remove the top level EDAC PCI
411 * kobject with its controls and attributes
412 */
413static void edac_pci_main_kobj_teardown(void)
414{
415 edac_dbg(0, "\n");
416
417 /* Decrement the count and only if no more controller instances
418 * are connected perform the unregisteration of the top level
419 * main kobj
420 */
421 if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
422 edac_dbg(0, "called kobject_put on main kobj\n");
423 kobject_put(edac_pci_top_main_kobj);
424 }
425}
426
427int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
428{
429 int err;
430 struct kobject *edac_kobj = &pci->kobj;
431
432 edac_dbg(0, "idx=%d\n", pci->pci_idx);
433
434 /* create the top main EDAC PCI kobject, IF needed */
435 err = edac_pci_main_kobj_setup();
436 if (err)
437 return err;
438
439 /* Create this instance's kobject under the MAIN kobject */
440 err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
441 if (err)
442 goto unregister_cleanup;
443
444 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
445 if (err) {
446 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
447 goto symlink_fail;
448 }
449
450 return 0;
451
452 /* Error unwind stack */
453symlink_fail:
454 edac_pci_unregister_sysfs_instance_kobj(pci);
455
456unregister_cleanup:
457 edac_pci_main_kobj_teardown();
458
459 return err;
460}
461
462void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
463{
464 edac_dbg(0, "index=%d\n", pci->pci_idx);
465
466 /* Remove the symlink */
467 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
468
469 /* remove this PCI instance's sysfs entries */
470 edac_pci_unregister_sysfs_instance_kobj(pci);
471
472 /* Call the main unregister function, which will determine
473 * if this 'pci' is the last instance.
474 * If it is, the main kobject will be unregistered as a result
475 */
476 edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n");
477 edac_pci_main_kobj_teardown();
478}
479
480/************************ PCI error handling *************************/
481static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
482{
483 int where;
484 u16 status;
485
486 where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
487 pci_read_config_word(dev, where, &status);
488
489 /* If we get back 0xFFFF then we must suspect that the card has been
490 * pulled but the Linux PCI layer has not yet finished cleaning up.
491 * We don't want to report on such devices
492 */
493
494 if (status == 0xFFFF) {
495 u32 sanity;
496
497 pci_read_config_dword(dev, 0, &sanity);
498
499 if (sanity == 0xFFFFFFFF)
500 return 0;
501 }
502
503 status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
504 PCI_STATUS_PARITY;
505
506 if (status)
507 /* reset only the bits we are interested in */
508 pci_write_config_word(dev, where, status);
509
510 return status;
511}
512
513
514/* Clear any PCI parity errors logged by this device. */
515static void edac_pci_dev_parity_clear(struct pci_dev *dev)
516{
517 u8 header_type;
518
519 get_pci_parity_status(dev, 0);
520
521 /* read the device TYPE, looking for bridges */
522 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
523
524 if ((header_type & PCI_HEADER_TYPE_MASK) == PCI_HEADER_TYPE_BRIDGE)
525 get_pci_parity_status(dev, 1);
526}
527
528/*
529 * PCI Parity polling
530 *
531 * Function to retrieve the current parity status
532 * and decode it
533 *
534 */
535static void edac_pci_dev_parity_test(struct pci_dev *dev)
536{
537 unsigned long flags;
538 u16 status;
539 u8 header_type;
540
541 /* stop any interrupts until we can acquire the status */
542 local_irq_save(flags);
543
544 /* read the STATUS register on this device */
545 status = get_pci_parity_status(dev, 0);
546
547 /* read the device TYPE, looking for bridges */
548 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
549
550 local_irq_restore(flags);
551
552 edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
553
554 /* check the status reg for errors on boards NOT marked as broken
555 * if broken, we cannot trust any of the status bits
556 */
557 if (status && !dev->broken_parity_status) {
558 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
559 edac_printk(KERN_CRIT, EDAC_PCI,
560 "Signaled System Error on %s\n",
561 pci_name(dev));
562 atomic_inc(&pci_nonparity_count);
563 }
564
565 if (status & (PCI_STATUS_PARITY)) {
566 edac_printk(KERN_CRIT, EDAC_PCI,
567 "Master Data Parity Error on %s\n",
568 pci_name(dev));
569
570 atomic_inc(&pci_parity_count);
571 }
572
573 if (status & (PCI_STATUS_DETECTED_PARITY)) {
574 edac_printk(KERN_CRIT, EDAC_PCI,
575 "Detected Parity Error on %s\n",
576 pci_name(dev));
577
578 atomic_inc(&pci_parity_count);
579 }
580 }
581
582
583 edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n",
584 header_type, dev_name(&dev->dev));
585
586 if ((header_type & PCI_HEADER_TYPE_MASK) == PCI_HEADER_TYPE_BRIDGE) {
587 /* On bridges, need to examine secondary status register */
588 status = get_pci_parity_status(dev, 1);
589
590 edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n",
591 status, dev_name(&dev->dev));
592
593 /* check the secondary status reg for errors,
594 * on NOT broken boards
595 */
596 if (status && !dev->broken_parity_status) {
597 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
598 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
599 "Signaled System Error on %s\n",
600 pci_name(dev));
601 atomic_inc(&pci_nonparity_count);
602 }
603
604 if (status & (PCI_STATUS_PARITY)) {
605 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
606 "Master Data Parity Error on "
607 "%s\n", pci_name(dev));
608
609 atomic_inc(&pci_parity_count);
610 }
611
612 if (status & (PCI_STATUS_DETECTED_PARITY)) {
613 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
614 "Detected Parity Error on %s\n",
615 pci_name(dev));
616
617 atomic_inc(&pci_parity_count);
618 }
619 }
620 }
621}
622
623/* reduce some complexity in definition of the iterator */
624typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
625
626/*
627 * pci_dev parity list iterator
628 *
629 * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or
630 * Parity ERRORs on primary or secondary devices.
631 */
632static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
633{
634 struct pci_dev *dev = NULL;
635
636 for_each_pci_dev(dev)
637 fn(dev);
638}
639
640/*
641 * edac_pci_do_parity_check
642 *
643 * performs the actual PCI parity check operation
644 */
645void edac_pci_do_parity_check(void)
646{
647 int before_count;
648
649 edac_dbg(3, "\n");
650
651 /* if policy has PCI check off, leave now */
652 if (!check_pci_errors)
653 return;
654
655 before_count = atomic_read(&pci_parity_count);
656
657 /* scan all PCI devices looking for a Parity Error on devices and
658 * bridges.
659 * The iterator calls pci_get_device() which might sleep, thus
660 * we cannot disable interrupts in this scan.
661 */
662 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
663
664 /* Only if operator has selected panic on PCI Error */
665 if (edac_pci_get_panic_on_pe()) {
666 /* If the count is different 'after' from 'before' */
667 if (before_count != atomic_read(&pci_parity_count))
668 panic("EDAC: PCI Parity Error");
669 }
670}
671
672/*
673 * edac_pci_clear_parity_errors
674 *
675 * function to perform an iteration over the PCI devices
676 * and clearn their current status
677 */
678void edac_pci_clear_parity_errors(void)
679{
680 /* Clear any PCI bus parity errors that devices initially have logged
681 * in their registers.
682 */
683 edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
684}
685
686/*
687 * edac_pci_handle_pe
688 *
689 * Called to handle a PARITY ERROR event
690 */
691void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
692{
693
694 /* global PE counter incremented by edac_pci_do_parity_check() */
695 atomic_inc(&pci->counters.pe_count);
696
697 if (edac_pci_get_log_pe())
698 edac_pci_printk(pci, KERN_WARNING,
699 "Parity Error ctl: %s %d: %s\n",
700 pci->ctl_name, pci->pci_idx, msg);
701
702 /*
703 * poke all PCI devices and see which one is the troublemaker
704 * panic() is called if set
705 */
706 edac_pci_do_parity_check();
707}
708EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
709
710
711/*
712 * edac_pci_handle_npe
713 *
714 * Called to handle a NON-PARITY ERROR event
715 */
716void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
717{
718
719 /* global NPE counter incremented by edac_pci_do_parity_check() */
720 atomic_inc(&pci->counters.npe_count);
721
722 if (edac_pci_get_log_npe())
723 edac_pci_printk(pci, KERN_WARNING,
724 "Non-Parity Error ctl: %s %d: %s\n",
725 pci->ctl_name, pci->pci_idx, msg);
726
727 /*
728 * poke all PCI devices and see which one is the troublemaker
729 * panic() is called if set
730 */
731 edac_pci_do_parity_check();
732}
733EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
734
735/*
736 * Define the PCI parameter to the module
737 */
738module_param(check_pci_errors, int, 0644);
739MODULE_PARM_DESC(check_pci_errors,
740 "Check for PCI bus parity errors: 0=off 1=on");
741module_param(edac_pci_panic_on_pe, int, 0644);
742MODULE_PARM_DESC(edac_pci_panic_on_pe,
743 "Panic on PCI Bus Parity error: 0=off 1=on");
1/*
2 * (C) 2005, 2006 Linux Networx (http://lnxi.com)
3 * This file may be distributed under the terms of the
4 * GNU General Public License.
5 *
6 * Written Doug Thompson <norsk5@xmission.com>
7 *
8 */
9#include <linux/module.h>
10#include <linux/edac.h>
11#include <linux/slab.h>
12#include <linux/ctype.h>
13
14#include "edac_pci.h"
15#include "edac_module.h"
16
17#define EDAC_PCI_SYMLINK "device"
18
19/* data variables exported via sysfs */
20static int check_pci_errors; /* default NO check PCI parity */
21static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
22static int edac_pci_log_pe = 1; /* log PCI parity errors */
23static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
24static int edac_pci_poll_msec = 1000; /* one second workq period */
25
26static atomic_t pci_parity_count = ATOMIC_INIT(0);
27static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
28
29static struct kobject *edac_pci_top_main_kobj;
30static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
31
32/* getter functions for the data variables */
33int edac_pci_get_check_errors(void)
34{
35 return check_pci_errors;
36}
37
38static int edac_pci_get_log_pe(void)
39{
40 return edac_pci_log_pe;
41}
42
43static int edac_pci_get_log_npe(void)
44{
45 return edac_pci_log_npe;
46}
47
48static int edac_pci_get_panic_on_pe(void)
49{
50 return edac_pci_panic_on_pe;
51}
52
53int edac_pci_get_poll_msec(void)
54{
55 return edac_pci_poll_msec;
56}
57
58/**************************** EDAC PCI sysfs instance *******************/
59static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
60{
61 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
62}
63
64static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
65 char *data)
66{
67 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
68}
69
70#define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
71#define to_instance_attr(a) container_of(a, struct instance_attribute, attr)
72
73/* DEVICE instance kobject release() function */
74static void edac_pci_instance_release(struct kobject *kobj)
75{
76 struct edac_pci_ctl_info *pci;
77
78 edac_dbg(0, "\n");
79
80 /* Form pointer to containing struct, the pci control struct */
81 pci = to_instance(kobj);
82
83 /* decrement reference count on top main kobj */
84 kobject_put(edac_pci_top_main_kobj);
85
86 kfree(pci); /* Free the control struct */
87}
88
89/* instance specific attribute structure */
90struct instance_attribute {
91 struct attribute attr;
92 ssize_t(*show) (struct edac_pci_ctl_info *, char *);
93 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
94};
95
96/* Function to 'show' fields from the edac_pci 'instance' structure */
97static ssize_t edac_pci_instance_show(struct kobject *kobj,
98 struct attribute *attr, char *buffer)
99{
100 struct edac_pci_ctl_info *pci = to_instance(kobj);
101 struct instance_attribute *instance_attr = to_instance_attr(attr);
102
103 if (instance_attr->show)
104 return instance_attr->show(pci, buffer);
105 return -EIO;
106}
107
108/* Function to 'store' fields into the edac_pci 'instance' structure */
109static ssize_t edac_pci_instance_store(struct kobject *kobj,
110 struct attribute *attr,
111 const char *buffer, size_t count)
112{
113 struct edac_pci_ctl_info *pci = to_instance(kobj);
114 struct instance_attribute *instance_attr = to_instance_attr(attr);
115
116 if (instance_attr->store)
117 return instance_attr->store(pci, buffer, count);
118 return -EIO;
119}
120
121/* fs_ops table */
122static const struct sysfs_ops pci_instance_ops = {
123 .show = edac_pci_instance_show,
124 .store = edac_pci_instance_store
125};
126
127#define INSTANCE_ATTR(_name, _mode, _show, _store) \
128static struct instance_attribute attr_instance_##_name = { \
129 .attr = {.name = __stringify(_name), .mode = _mode }, \
130 .show = _show, \
131 .store = _store, \
132};
133
134INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
135INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
136
137/* pci instance attributes */
138static struct attribute *pci_instance_attrs[] = {
139 &attr_instance_pe_count.attr,
140 &attr_instance_npe_count.attr,
141 NULL
142};
143ATTRIBUTE_GROUPS(pci_instance);
144
145/* the ktype for a pci instance */
146static struct kobj_type ktype_pci_instance = {
147 .release = edac_pci_instance_release,
148 .sysfs_ops = &pci_instance_ops,
149 .default_groups = pci_instance_groups,
150};
151
152/*
153 * edac_pci_create_instance_kobj
154 *
155 * construct one EDAC PCI instance's kobject for use
156 */
157static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
158{
159 struct kobject *main_kobj;
160 int err;
161
162 edac_dbg(0, "\n");
163
164 /* First bump the ref count on the top main kobj, which will
165 * track the number of PCI instances we have, and thus nest
166 * properly on keeping the module loaded
167 */
168 main_kobj = kobject_get(edac_pci_top_main_kobj);
169 if (!main_kobj) {
170 err = -ENODEV;
171 goto error_out;
172 }
173
174 /* And now register this new kobject under the main kobj */
175 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
176 edac_pci_top_main_kobj, "pci%d", idx);
177 if (err != 0) {
178 edac_dbg(2, "failed to register instance pci%d\n", idx);
179 kobject_put(edac_pci_top_main_kobj);
180 goto error_out;
181 }
182
183 kobject_uevent(&pci->kobj, KOBJ_ADD);
184 edac_dbg(1, "Register instance 'pci%d' kobject\n", idx);
185
186 return 0;
187
188 /* Error unwind statck */
189error_out:
190 return err;
191}
192
193/*
194 * edac_pci_unregister_sysfs_instance_kobj
195 *
196 * unregister the kobj for the EDAC PCI instance
197 */
198static void edac_pci_unregister_sysfs_instance_kobj(
199 struct edac_pci_ctl_info *pci)
200{
201 edac_dbg(0, "\n");
202
203 /* Unregister the instance kobject and allow its release
204 * function release the main reference count and then
205 * kfree the memory
206 */
207 kobject_put(&pci->kobj);
208}
209
210/***************************** EDAC PCI sysfs root **********************/
211#define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj)
212#define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr)
213
214/* simple show/store functions for attributes */
215static ssize_t edac_pci_int_show(void *ptr, char *buffer)
216{
217 int *value = ptr;
218 return sprintf(buffer, "%d\n", *value);
219}
220
221static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
222{
223 int *value = ptr;
224
225 if (isdigit(*buffer))
226 *value = simple_strtoul(buffer, NULL, 0);
227
228 return count;
229}
230
231struct edac_pci_dev_attribute {
232 struct attribute attr;
233 void *value;
234 ssize_t(*show) (void *, char *);
235 ssize_t(*store) (void *, const char *, size_t);
236};
237
238/* Set of show/store abstract level functions for PCI Parity object */
239static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
240 char *buffer)
241{
242 struct edac_pci_dev_attribute *edac_pci_dev;
243 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
244
245 if (edac_pci_dev->show)
246 return edac_pci_dev->show(edac_pci_dev->value, buffer);
247 return -EIO;
248}
249
250static ssize_t edac_pci_dev_store(struct kobject *kobj,
251 struct attribute *attr, const char *buffer,
252 size_t count)
253{
254 struct edac_pci_dev_attribute *edac_pci_dev;
255 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
256
257 if (edac_pci_dev->store)
258 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
259 return -EIO;
260}
261
262static const struct sysfs_ops edac_pci_sysfs_ops = {
263 .show = edac_pci_dev_show,
264 .store = edac_pci_dev_store
265};
266
267#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
268static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
269 .attr = {.name = __stringify(_name), .mode = _mode }, \
270 .value = &_name, \
271 .show = _show, \
272 .store = _store, \
273};
274
275#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \
276static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
277 .attr = {.name = __stringify(_name), .mode = _mode }, \
278 .value = _data, \
279 .show = _show, \
280 .store = _store, \
281};
282
283/* PCI Parity control files */
284EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
285 edac_pci_int_store);
286EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
287 edac_pci_int_store);
288EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
289 edac_pci_int_store);
290EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
291 edac_pci_int_store);
292EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
293EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
294
295/* Base Attributes of the memory ECC object */
296static struct attribute *edac_pci_attrs[] = {
297 &edac_pci_attr_check_pci_errors.attr,
298 &edac_pci_attr_edac_pci_log_pe.attr,
299 &edac_pci_attr_edac_pci_log_npe.attr,
300 &edac_pci_attr_edac_pci_panic_on_pe.attr,
301 &edac_pci_attr_pci_parity_count.attr,
302 &edac_pci_attr_pci_nonparity_count.attr,
303 NULL,
304};
305ATTRIBUTE_GROUPS(edac_pci);
306
307/*
308 * edac_pci_release_main_kobj
309 *
310 * This release function is called when the reference count to the
311 * passed kobj goes to zero.
312 *
313 * This kobj is the 'main' kobject that EDAC PCI instances
314 * link to, and thus provide for proper nesting counts
315 */
316static void edac_pci_release_main_kobj(struct kobject *kobj)
317{
318 edac_dbg(0, "here to module_put(THIS_MODULE)\n");
319
320 kfree(kobj);
321
322 /* last reference to top EDAC PCI kobject has been removed,
323 * NOW release our ref count on the core module
324 */
325 module_put(THIS_MODULE);
326}
327
328/* ktype struct for the EDAC PCI main kobj */
329static struct kobj_type ktype_edac_pci_main_kobj = {
330 .release = edac_pci_release_main_kobj,
331 .sysfs_ops = &edac_pci_sysfs_ops,
332 .default_groups = edac_pci_groups,
333};
334
335/**
336 * edac_pci_main_kobj_setup: Setup the sysfs for EDAC PCI attributes.
337 */
338static int edac_pci_main_kobj_setup(void)
339{
340 int err;
341 struct bus_type *edac_subsys;
342
343 edac_dbg(0, "\n");
344
345 /* check and count if we have already created the main kobject */
346 if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
347 return 0;
348
349 /* First time, so create the main kobject and its
350 * controls and attributes
351 */
352 edac_subsys = edac_get_sysfs_subsys();
353
354 /* Bump the reference count on this module to ensure the
355 * modules isn't unloaded until we deconstruct the top
356 * level main kobj for EDAC PCI
357 */
358 if (!try_module_get(THIS_MODULE)) {
359 edac_dbg(1, "try_module_get() failed\n");
360 err = -ENODEV;
361 goto decrement_count_fail;
362 }
363
364 edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
365 if (!edac_pci_top_main_kobj) {
366 edac_dbg(1, "Failed to allocate\n");
367 err = -ENOMEM;
368 goto kzalloc_fail;
369 }
370
371 /* Instanstiate the pci object */
372 err = kobject_init_and_add(edac_pci_top_main_kobj,
373 &ktype_edac_pci_main_kobj,
374 &edac_subsys->dev_root->kobj, "pci");
375 if (err) {
376 edac_dbg(1, "Failed to register '.../edac/pci'\n");
377 goto kobject_init_and_add_fail;
378 }
379
380 /* At this point, to 'release' the top level kobject
381 * for EDAC PCI, then edac_pci_main_kobj_teardown()
382 * must be used, for resources to be cleaned up properly
383 */
384 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
385 edac_dbg(1, "Registered '.../edac/pci' kobject\n");
386
387 return 0;
388
389 /* Error unwind statck */
390kobject_init_and_add_fail:
391 kobject_put(edac_pci_top_main_kobj);
392
393kzalloc_fail:
394 module_put(THIS_MODULE);
395
396decrement_count_fail:
397 /* if are on this error exit, nothing to tear down */
398 atomic_dec(&edac_pci_sysfs_refcount);
399
400 return err;
401}
402
403/*
404 * edac_pci_main_kobj_teardown()
405 *
406 * if no longer linked (needed) remove the top level EDAC PCI
407 * kobject with its controls and attributes
408 */
409static void edac_pci_main_kobj_teardown(void)
410{
411 edac_dbg(0, "\n");
412
413 /* Decrement the count and only if no more controller instances
414 * are connected perform the unregisteration of the top level
415 * main kobj
416 */
417 if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
418 edac_dbg(0, "called kobject_put on main kobj\n");
419 kobject_put(edac_pci_top_main_kobj);
420 }
421}
422
423int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
424{
425 int err;
426 struct kobject *edac_kobj = &pci->kobj;
427
428 edac_dbg(0, "idx=%d\n", pci->pci_idx);
429
430 /* create the top main EDAC PCI kobject, IF needed */
431 err = edac_pci_main_kobj_setup();
432 if (err)
433 return err;
434
435 /* Create this instance's kobject under the MAIN kobject */
436 err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
437 if (err)
438 goto unregister_cleanup;
439
440 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
441 if (err) {
442 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
443 goto symlink_fail;
444 }
445
446 return 0;
447
448 /* Error unwind stack */
449symlink_fail:
450 edac_pci_unregister_sysfs_instance_kobj(pci);
451
452unregister_cleanup:
453 edac_pci_main_kobj_teardown();
454
455 return err;
456}
457
458void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
459{
460 edac_dbg(0, "index=%d\n", pci->pci_idx);
461
462 /* Remove the symlink */
463 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
464
465 /* remove this PCI instance's sysfs entries */
466 edac_pci_unregister_sysfs_instance_kobj(pci);
467
468 /* Call the main unregister function, which will determine
469 * if this 'pci' is the last instance.
470 * If it is, the main kobject will be unregistered as a result
471 */
472 edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n");
473 edac_pci_main_kobj_teardown();
474}
475
476/************************ PCI error handling *************************/
477static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
478{
479 int where;
480 u16 status;
481
482 where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
483 pci_read_config_word(dev, where, &status);
484
485 /* If we get back 0xFFFF then we must suspect that the card has been
486 * pulled but the Linux PCI layer has not yet finished cleaning up.
487 * We don't want to report on such devices
488 */
489
490 if (status == 0xFFFF) {
491 u32 sanity;
492
493 pci_read_config_dword(dev, 0, &sanity);
494
495 if (sanity == 0xFFFFFFFF)
496 return 0;
497 }
498
499 status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
500 PCI_STATUS_PARITY;
501
502 if (status)
503 /* reset only the bits we are interested in */
504 pci_write_config_word(dev, where, status);
505
506 return status;
507}
508
509
510/* Clear any PCI parity errors logged by this device. */
511static void edac_pci_dev_parity_clear(struct pci_dev *dev)
512{
513 u8 header_type;
514
515 get_pci_parity_status(dev, 0);
516
517 /* read the device TYPE, looking for bridges */
518 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
519
520 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
521 get_pci_parity_status(dev, 1);
522}
523
524/*
525 * PCI Parity polling
526 *
527 * Function to retrieve the current parity status
528 * and decode it
529 *
530 */
531static void edac_pci_dev_parity_test(struct pci_dev *dev)
532{
533 unsigned long flags;
534 u16 status;
535 u8 header_type;
536
537 /* stop any interrupts until we can acquire the status */
538 local_irq_save(flags);
539
540 /* read the STATUS register on this device */
541 status = get_pci_parity_status(dev, 0);
542
543 /* read the device TYPE, looking for bridges */
544 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
545
546 local_irq_restore(flags);
547
548 edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
549
550 /* check the status reg for errors on boards NOT marked as broken
551 * if broken, we cannot trust any of the status bits
552 */
553 if (status && !dev->broken_parity_status) {
554 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
555 edac_printk(KERN_CRIT, EDAC_PCI,
556 "Signaled System Error on %s\n",
557 pci_name(dev));
558 atomic_inc(&pci_nonparity_count);
559 }
560
561 if (status & (PCI_STATUS_PARITY)) {
562 edac_printk(KERN_CRIT, EDAC_PCI,
563 "Master Data Parity Error on %s\n",
564 pci_name(dev));
565
566 atomic_inc(&pci_parity_count);
567 }
568
569 if (status & (PCI_STATUS_DETECTED_PARITY)) {
570 edac_printk(KERN_CRIT, EDAC_PCI,
571 "Detected Parity Error on %s\n",
572 pci_name(dev));
573
574 atomic_inc(&pci_parity_count);
575 }
576 }
577
578
579 edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n",
580 header_type, dev_name(&dev->dev));
581
582 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
583 /* On bridges, need to examine secondary status register */
584 status = get_pci_parity_status(dev, 1);
585
586 edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n",
587 status, dev_name(&dev->dev));
588
589 /* check the secondary status reg for errors,
590 * on NOT broken boards
591 */
592 if (status && !dev->broken_parity_status) {
593 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
594 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
595 "Signaled System Error on %s\n",
596 pci_name(dev));
597 atomic_inc(&pci_nonparity_count);
598 }
599
600 if (status & (PCI_STATUS_PARITY)) {
601 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
602 "Master Data Parity Error on "
603 "%s\n", pci_name(dev));
604
605 atomic_inc(&pci_parity_count);
606 }
607
608 if (status & (PCI_STATUS_DETECTED_PARITY)) {
609 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
610 "Detected Parity Error on %s\n",
611 pci_name(dev));
612
613 atomic_inc(&pci_parity_count);
614 }
615 }
616 }
617}
618
619/* reduce some complexity in definition of the iterator */
620typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
621
622/*
623 * pci_dev parity list iterator
624 *
625 * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or
626 * Parity ERRORs on primary or secondary devices.
627 */
628static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
629{
630 struct pci_dev *dev = NULL;
631
632 for_each_pci_dev(dev)
633 fn(dev);
634}
635
636/*
637 * edac_pci_do_parity_check
638 *
639 * performs the actual PCI parity check operation
640 */
641void edac_pci_do_parity_check(void)
642{
643 int before_count;
644
645 edac_dbg(3, "\n");
646
647 /* if policy has PCI check off, leave now */
648 if (!check_pci_errors)
649 return;
650
651 before_count = atomic_read(&pci_parity_count);
652
653 /* scan all PCI devices looking for a Parity Error on devices and
654 * bridges.
655 * The iterator calls pci_get_device() which might sleep, thus
656 * we cannot disable interrupts in this scan.
657 */
658 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
659
660 /* Only if operator has selected panic on PCI Error */
661 if (edac_pci_get_panic_on_pe()) {
662 /* If the count is different 'after' from 'before' */
663 if (before_count != atomic_read(&pci_parity_count))
664 panic("EDAC: PCI Parity Error");
665 }
666}
667
668/*
669 * edac_pci_clear_parity_errors
670 *
671 * function to perform an iteration over the PCI devices
672 * and clearn their current status
673 */
674void edac_pci_clear_parity_errors(void)
675{
676 /* Clear any PCI bus parity errors that devices initially have logged
677 * in their registers.
678 */
679 edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
680}
681
682/*
683 * edac_pci_handle_pe
684 *
685 * Called to handle a PARITY ERROR event
686 */
687void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
688{
689
690 /* global PE counter incremented by edac_pci_do_parity_check() */
691 atomic_inc(&pci->counters.pe_count);
692
693 if (edac_pci_get_log_pe())
694 edac_pci_printk(pci, KERN_WARNING,
695 "Parity Error ctl: %s %d: %s\n",
696 pci->ctl_name, pci->pci_idx, msg);
697
698 /*
699 * poke all PCI devices and see which one is the troublemaker
700 * panic() is called if set
701 */
702 edac_pci_do_parity_check();
703}
704EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
705
706
707/*
708 * edac_pci_handle_npe
709 *
710 * Called to handle a NON-PARITY ERROR event
711 */
712void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
713{
714
715 /* global NPE counter incremented by edac_pci_do_parity_check() */
716 atomic_inc(&pci->counters.npe_count);
717
718 if (edac_pci_get_log_npe())
719 edac_pci_printk(pci, KERN_WARNING,
720 "Non-Parity Error ctl: %s %d: %s\n",
721 pci->ctl_name, pci->pci_idx, msg);
722
723 /*
724 * poke all PCI devices and see which one is the troublemaker
725 * panic() is called if set
726 */
727 edac_pci_do_parity_check();
728}
729EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
730
731/*
732 * Define the PCI parameter to the module
733 */
734module_param(check_pci_errors, int, 0644);
735MODULE_PARM_DESC(check_pci_errors,
736 "Check for PCI bus parity errors: 0=off 1=on");
737module_param(edac_pci_panic_on_pe, int, 0644);
738MODULE_PARM_DESC(edac_pci_panic_on_pe,
739 "Panic on PCI Bus Parity error: 0=off 1=on");