Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
/*
 * (C) 2005, 2006 Linux Networx (http://lnxi.com)
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written Doug Thompson <norsk5@xmission.com>
 *
 */
#include <linux/module.h>
#include <linux/edac.h>
#include <linux/slab.h>
#include <linux/ctype.h>

#include "edac_pci.h"
#include "edac_module.h"

#define EDAC_PCI_SYMLINK	"device"

/* data variables exported via sysfs */
static int check_pci_errors;		/* default NO check PCI parity */
static int edac_pci_panic_on_pe;	/* default NO panic on PCI Parity */
static int edac_pci_log_pe = 1;		/* log PCI parity errors */
static int edac_pci_log_npe = 1;	/* log PCI non-parity error errors */
static int edac_pci_poll_msec = 1000;	/* one second workq period */

static atomic_t pci_parity_count = ATOMIC_INIT(0);
static atomic_t pci_nonparity_count = ATOMIC_INIT(0);

static struct kobject *edac_pci_top_main_kobj;
static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);

/* getter functions for the data variables */
int edac_pci_get_check_errors(void)
{
	return check_pci_errors;
}

static int edac_pci_get_log_pe(void)
{
	return edac_pci_log_pe;
}

static int edac_pci_get_log_npe(void)
{
	return edac_pci_log_npe;
}

static int edac_pci_get_panic_on_pe(void)
{
	return edac_pci_panic_on_pe;
}

int edac_pci_get_poll_msec(void)
{
	return edac_pci_poll_msec;
}

/**************************** EDAC PCI sysfs instance *******************/
static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
{
	return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
}

static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
				char *data)
{
	return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
}

#define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
#define to_instance_attr(a) container_of(a, struct instance_attribute, attr)

/* DEVICE instance kobject release() function */
static void edac_pci_instance_release(struct kobject *kobj)
{
	struct edac_pci_ctl_info *pci;

	edac_dbg(0, "\n");

	/* Form pointer to containing struct, the pci control struct */
	pci = to_instance(kobj);

	/* decrement reference count on top main kobj */
	kobject_put(edac_pci_top_main_kobj);

	kfree(pci);	/* Free the control struct */
}

/* instance specific attribute structure */
struct instance_attribute {
	struct attribute attr;
	ssize_t(*show) (struct edac_pci_ctl_info *, char *);
	ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
};

/* Function to 'show' fields from the edac_pci 'instance' structure */
static ssize_t edac_pci_instance_show(struct kobject *kobj,
				struct attribute *attr, char *buffer)
{
	struct edac_pci_ctl_info *pci = to_instance(kobj);
	struct instance_attribute *instance_attr = to_instance_attr(attr);

	if (instance_attr->show)
		return instance_attr->show(pci, buffer);
	return -EIO;
}

/* Function to 'store' fields into the edac_pci 'instance' structure */
static ssize_t edac_pci_instance_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buffer, size_t count)
{
	struct edac_pci_ctl_info *pci = to_instance(kobj);
	struct instance_attribute *instance_attr = to_instance_attr(attr);

	if (instance_attr->store)
		return instance_attr->store(pci, buffer, count);
	return -EIO;
}

/* fs_ops table */
static const struct sysfs_ops pci_instance_ops = {
	.show = edac_pci_instance_show,
	.store = edac_pci_instance_store
};

#define INSTANCE_ATTR(_name, _mode, _show, _store)	\
static struct instance_attribute attr_instance_##_name = {	\
	.attr	= {.name = __stringify(_name), .mode = _mode },	\
	.show	= _show,					\
	.store	= _store,					\
};

INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);

/* pci instance attributes */
static struct instance_attribute *pci_instance_attr[] = {
	&attr_instance_pe_count,
	&attr_instance_npe_count,
	NULL
};

/* the ktype for a pci instance */
static struct kobj_type ktype_pci_instance = {
	.release = edac_pci_instance_release,
	.sysfs_ops = &pci_instance_ops,
	.default_attrs = (struct attribute **)pci_instance_attr,
};

/*
 * edac_pci_create_instance_kobj
 *
 *	construct one EDAC PCI instance's kobject for use
 */
static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
{
	struct kobject *main_kobj;
	int err;

	edac_dbg(0, "\n");

	/* First bump the ref count on the top main kobj, which will
	 * track the number of PCI instances we have, and thus nest
	 * properly on keeping the module loaded
	 */
	main_kobj = kobject_get(edac_pci_top_main_kobj);
	if (!main_kobj) {
		err = -ENODEV;
		goto error_out;
	}

	/* And now register this new kobject under the main kobj */
	err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
				   edac_pci_top_main_kobj, "pci%d", idx);
	if (err != 0) {
		edac_dbg(2, "failed to register instance pci%d\n", idx);
		kobject_put(edac_pci_top_main_kobj);
		goto error_out;
	}

	kobject_uevent(&pci->kobj, KOBJ_ADD);
	edac_dbg(1, "Register instance 'pci%d' kobject\n", idx);

	return 0;

	/* Error unwind statck */
error_out:
	return err;
}

/*
 * edac_pci_unregister_sysfs_instance_kobj
 *
 *	unregister the kobj for the EDAC PCI instance
 */
static void edac_pci_unregister_sysfs_instance_kobj(
			struct edac_pci_ctl_info *pci)
{
	edac_dbg(0, "\n");

	/* Unregister the instance kobject and allow its release
	 * function release the main reference count and then
	 * kfree the memory
	 */
	kobject_put(&pci->kobj);
}

/***************************** EDAC PCI sysfs root **********************/
#define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj)
#define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr)

/* simple show/store functions for attributes */
static ssize_t edac_pci_int_show(void *ptr, char *buffer)
{
	int *value = ptr;
	return sprintf(buffer, "%d\n", *value);
}

static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
{
	int *value = ptr;

	if (isdigit(*buffer))
		*value = simple_strtoul(buffer, NULL, 0);

	return count;
}

struct edac_pci_dev_attribute {
	struct attribute attr;
	void *value;
	 ssize_t(*show) (void *, char *);
	 ssize_t(*store) (void *, const char *, size_t);
};

/* Set of show/store abstract level functions for PCI Parity object */
static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
				 char *buffer)
{
	struct edac_pci_dev_attribute *edac_pci_dev;
	edac_pci_dev = (struct edac_pci_dev_attribute *)attr;

	if (edac_pci_dev->show)
		return edac_pci_dev->show(edac_pci_dev->value, buffer);
	return -EIO;
}

static ssize_t edac_pci_dev_store(struct kobject *kobj,
				struct attribute *attr, const char *buffer,
				size_t count)
{
	struct edac_pci_dev_attribute *edac_pci_dev;
	edac_pci_dev = (struct edac_pci_dev_attribute *)attr;

	if (edac_pci_dev->store)
		return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
	return -EIO;
}

static const struct sysfs_ops edac_pci_sysfs_ops = {
	.show = edac_pci_dev_show,
	.store = edac_pci_dev_store
};

#define EDAC_PCI_ATTR(_name,_mode,_show,_store)			\
static struct edac_pci_dev_attribute edac_pci_attr_##_name = {		\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = &_name,					\
	.show   = _show,					\
	.store  = _store,					\
};

#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store)	\
static struct edac_pci_dev_attribute edac_pci_attr_##_name = {		\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = _data,					\
	.show   = _show,					\
	.store  = _store,					\
};

/* PCI Parity control files */
EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
	edac_pci_int_store);
EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
	edac_pci_int_store);
EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
	edac_pci_int_store);
EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
	edac_pci_int_store);
EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);

/* Base Attributes of the memory ECC object */
static struct edac_pci_dev_attribute *edac_pci_attr[] = {
	&edac_pci_attr_check_pci_errors,
	&edac_pci_attr_edac_pci_log_pe,
	&edac_pci_attr_edac_pci_log_npe,
	&edac_pci_attr_edac_pci_panic_on_pe,
	&edac_pci_attr_pci_parity_count,
	&edac_pci_attr_pci_nonparity_count,
	NULL,
};

/*
 * edac_pci_release_main_kobj
 *
 *	This release function is called when the reference count to the
 *	passed kobj goes to zero.
 *
 *	This kobj is the 'main' kobject that EDAC PCI instances
 *	link to, and thus provide for proper nesting counts
 */
static void edac_pci_release_main_kobj(struct kobject *kobj)
{
	edac_dbg(0, "here to module_put(THIS_MODULE)\n");

	kfree(kobj);

	/* last reference to top EDAC PCI kobject has been removed,
	 * NOW release our ref count on the core module
	 */
	module_put(THIS_MODULE);
}

/* ktype struct for the EDAC PCI main kobj */
static struct kobj_type ktype_edac_pci_main_kobj = {
	.release = edac_pci_release_main_kobj,
	.sysfs_ops = &edac_pci_sysfs_ops,
	.default_attrs = (struct attribute **)edac_pci_attr,
};

/**
 * edac_pci_main_kobj_setup: Setup the sysfs for EDAC PCI attributes.
 */
static int edac_pci_main_kobj_setup(void)
{
	int err;
	struct bus_type *edac_subsys;

	edac_dbg(0, "\n");

	/* check and count if we have already created the main kobject */
	if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
		return 0;

	/* First time, so create the main kobject and its
	 * controls and attributes
	 */
	edac_subsys = edac_get_sysfs_subsys();

	/* Bump the reference count on this module to ensure the
	 * modules isn't unloaded until we deconstruct the top
	 * level main kobj for EDAC PCI
	 */
	if (!try_module_get(THIS_MODULE)) {
		edac_dbg(1, "try_module_get() failed\n");
		err = -ENODEV;
		goto decrement_count_fail;
	}

	edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
	if (!edac_pci_top_main_kobj) {
		edac_dbg(1, "Failed to allocate\n");
		err = -ENOMEM;
		goto kzalloc_fail;
	}

	/* Instanstiate the pci object */
	err = kobject_init_and_add(edac_pci_top_main_kobj,
				   &ktype_edac_pci_main_kobj,
				   &edac_subsys->dev_root->kobj, "pci");
	if (err) {
		edac_dbg(1, "Failed to register '.../edac/pci'\n");
		goto kobject_init_and_add_fail;
	}

	/* At this point, to 'release' the top level kobject
	 * for EDAC PCI, then edac_pci_main_kobj_teardown()
	 * must be used, for resources to be cleaned up properly
	 */
	kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
	edac_dbg(1, "Registered '.../edac/pci' kobject\n");

	return 0;

	/* Error unwind statck */
kobject_init_and_add_fail:
	kfree(edac_pci_top_main_kobj);

kzalloc_fail:
	module_put(THIS_MODULE);

decrement_count_fail:
	/* if are on this error exit, nothing to tear down */
	atomic_dec(&edac_pci_sysfs_refcount);

	return err;
}

/*
 * edac_pci_main_kobj_teardown()
 *
 *	if no longer linked (needed) remove the top level EDAC PCI
 *	kobject with its controls and attributes
 */
static void edac_pci_main_kobj_teardown(void)
{
	edac_dbg(0, "\n");

	/* Decrement the count and only if no more controller instances
	 * are connected perform the unregisteration of the top level
	 * main kobj
	 */
	if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
		edac_dbg(0, "called kobject_put on main kobj\n");
		kobject_put(edac_pci_top_main_kobj);
	}
}

int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
{
	int err;
	struct kobject *edac_kobj = &pci->kobj;

	edac_dbg(0, "idx=%d\n", pci->pci_idx);

	/* create the top main EDAC PCI kobject, IF needed */
	err = edac_pci_main_kobj_setup();
	if (err)
		return err;

	/* Create this instance's kobject under the MAIN kobject */
	err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
	if (err)
		goto unregister_cleanup;

	err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
	if (err) {
		edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
		goto symlink_fail;
	}

	return 0;

	/* Error unwind stack */
symlink_fail:
	edac_pci_unregister_sysfs_instance_kobj(pci);

unregister_cleanup:
	edac_pci_main_kobj_teardown();

	return err;
}

void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
{
	edac_dbg(0, "index=%d\n", pci->pci_idx);

	/* Remove the symlink */
	sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);

	/* remove this PCI instance's sysfs entries */
	edac_pci_unregister_sysfs_instance_kobj(pci);

	/* Call the main unregister function, which will determine
	 * if this 'pci' is the last instance.
	 * If it is, the main kobject will be unregistered as a result
	 */
	edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n");
	edac_pci_main_kobj_teardown();
}

/************************ PCI error handling *************************/
static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
{
	int where;
	u16 status;

	where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
	pci_read_config_word(dev, where, &status);

	/* If we get back 0xFFFF then we must suspect that the card has been
	 * pulled but the Linux PCI layer has not yet finished cleaning up.
	 * We don't want to report on such devices
	 */

	if (status == 0xFFFF) {
		u32 sanity;

		pci_read_config_dword(dev, 0, &sanity);

		if (sanity == 0xFFFFFFFF)
			return 0;
	}

	status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
		PCI_STATUS_PARITY;

	if (status)
		/* reset only the bits we are interested in */
		pci_write_config_word(dev, where, status);

	return status;
}


/* Clear any PCI parity errors logged by this device. */
static void edac_pci_dev_parity_clear(struct pci_dev *dev)
{
	u8 header_type;

	get_pci_parity_status(dev, 0);

	/* read the device TYPE, looking for bridges */
	pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);

	if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
		get_pci_parity_status(dev, 1);
}

/*
 *  PCI Parity polling
 *
 *	Function to retrieve the current parity status
 *	and decode it
 *
 */
static void edac_pci_dev_parity_test(struct pci_dev *dev)
{
	unsigned long flags;
	u16 status;
	u8 header_type;

	/* stop any interrupts until we can acquire the status */
	local_irq_save(flags);

	/* read the STATUS register on this device */
	status = get_pci_parity_status(dev, 0);

	/* read the device TYPE, looking for bridges */
	pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);

	local_irq_restore(flags);

	edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));

	/* check the status reg for errors on boards NOT marked as broken
	 * if broken, we cannot trust any of the status bits
	 */
	if (status && !dev->broken_parity_status) {
		if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
			edac_printk(KERN_CRIT, EDAC_PCI,
				"Signaled System Error on %s\n",
				pci_name(dev));
			atomic_inc(&pci_nonparity_count);
		}

		if (status & (PCI_STATUS_PARITY)) {
			edac_printk(KERN_CRIT, EDAC_PCI,
				"Master Data Parity Error on %s\n",
				pci_name(dev));

			atomic_inc(&pci_parity_count);
		}

		if (status & (PCI_STATUS_DETECTED_PARITY)) {
			edac_printk(KERN_CRIT, EDAC_PCI,
				"Detected Parity Error on %s\n",
				pci_name(dev));

			atomic_inc(&pci_parity_count);
		}
	}


	edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n",
		 header_type, dev_name(&dev->dev));

	if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
		/* On bridges, need to examine secondary status register  */
		status = get_pci_parity_status(dev, 1);

		edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n",
			 status, dev_name(&dev->dev));

		/* check the secondary status reg for errors,
		 * on NOT broken boards
		 */
		if (status && !dev->broken_parity_status) {
			if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
				edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
					"Signaled System Error on %s\n",
					pci_name(dev));
				atomic_inc(&pci_nonparity_count);
			}

			if (status & (PCI_STATUS_PARITY)) {
				edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
					"Master Data Parity Error on "
					"%s\n", pci_name(dev));

				atomic_inc(&pci_parity_count);
			}

			if (status & (PCI_STATUS_DETECTED_PARITY)) {
				edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
					"Detected Parity Error on %s\n",
					pci_name(dev));

				atomic_inc(&pci_parity_count);
			}
		}
	}
}

/* reduce some complexity in definition of the iterator */
typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);

/*
 * pci_dev parity list iterator
 *
 *	Scan the PCI device list looking for SERRORs, Master Parity ERRORS or
 *	Parity ERRORs on primary or secondary devices.
 */
static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
{
	struct pci_dev *dev = NULL;

	for_each_pci_dev(dev)
		fn(dev);
}

/*
 * edac_pci_do_parity_check
 *
 *	performs the actual PCI parity check operation
 */
void edac_pci_do_parity_check(void)
{
	int before_count;

	edac_dbg(3, "\n");

	/* if policy has PCI check off, leave now */
	if (!check_pci_errors)
		return;

	before_count = atomic_read(&pci_parity_count);

	/* scan all PCI devices looking for a Parity Error on devices and
	 * bridges.
	 * The iterator calls pci_get_device() which might sleep, thus
	 * we cannot disable interrupts in this scan.
	 */
	edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);

	/* Only if operator has selected panic on PCI Error */
	if (edac_pci_get_panic_on_pe()) {
		/* If the count is different 'after' from 'before' */
		if (before_count != atomic_read(&pci_parity_count))
			panic("EDAC: PCI Parity Error");
	}
}

/*
 * edac_pci_clear_parity_errors
 *
 *	function to perform an iteration over the PCI devices
 *	and clearn their current status
 */
void edac_pci_clear_parity_errors(void)
{
	/* Clear any PCI bus parity errors that devices initially have logged
	 * in their registers.
	 */
	edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
}

/*
 * edac_pci_handle_pe
 *
 *	Called to handle a PARITY ERROR event
 */
void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
{

	/* global PE counter incremented by edac_pci_do_parity_check() */
	atomic_inc(&pci->counters.pe_count);

	if (edac_pci_get_log_pe())
		edac_pci_printk(pci, KERN_WARNING,
				"Parity Error ctl: %s %d: %s\n",
				pci->ctl_name, pci->pci_idx, msg);

	/*
	 * poke all PCI devices and see which one is the troublemaker
	 * panic() is called if set
	 */
	edac_pci_do_parity_check();
}
EXPORT_SYMBOL_GPL(edac_pci_handle_pe);


/*
 * edac_pci_handle_npe
 *
 *	Called to handle a NON-PARITY ERROR event
 */
void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
{

	/* global NPE counter incremented by edac_pci_do_parity_check() */
	atomic_inc(&pci->counters.npe_count);

	if (edac_pci_get_log_npe())
		edac_pci_printk(pci, KERN_WARNING,
				"Non-Parity Error ctl: %s %d: %s\n",
				pci->ctl_name, pci->pci_idx, msg);

	/*
	 * poke all PCI devices and see which one is the troublemaker
	 * panic() is called if set
	 */
	edac_pci_do_parity_check();
}
EXPORT_SYMBOL_GPL(edac_pci_handle_npe);

/*
 * Define the PCI parameter to the module
 */
module_param(check_pci_errors, int, 0644);
MODULE_PARM_DESC(check_pci_errors,
		 "Check for PCI bus parity errors: 0=off 1=on");
module_param(edac_pci_panic_on_pe, int, 0644);
MODULE_PARM_DESC(edac_pci_panic_on_pe,
		 "Panic on PCI Bus Parity error: 0=off 1=on");