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 */
20 static int check_pci_errors; /* default NO check PCI parity */
21 static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
22 static int edac_pci_log_pe = 1; /* log PCI parity errors */
23 static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
24 static int edac_pci_poll_msec = 1000; /* one second workq period */
25
26 static atomic_t pci_parity_count = ATOMIC_INIT(0);
27 static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
28
29 static struct kobject *edac_pci_top_main_kobj;
30 static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
31
32 /* getter functions for the data variables */
edac_pci_get_check_errors(void)33 int edac_pci_get_check_errors(void)
34 {
35 return check_pci_errors;
36 }
37
edac_pci_get_log_pe(void)38 static int edac_pci_get_log_pe(void)
39 {
40 return edac_pci_log_pe;
41 }
42
edac_pci_get_log_npe(void)43 static int edac_pci_get_log_npe(void)
44 {
45 return edac_pci_log_npe;
46 }
47
edac_pci_get_panic_on_pe(void)48 static int edac_pci_get_panic_on_pe(void)
49 {
50 return edac_pci_panic_on_pe;
51 }
52
edac_pci_get_poll_msec(void)53 int edac_pci_get_poll_msec(void)
54 {
55 return edac_pci_poll_msec;
56 }
57
58 /**************************** EDAC PCI sysfs instance *******************/
instance_pe_count_show(struct edac_pci_ctl_info * pci,char * data)59 static 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
instance_npe_count_show(struct edac_pci_ctl_info * pci,char * data)64 static 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 */
edac_pci_instance_release(struct kobject * kobj)74 static 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 */
90 struct 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 */
edac_pci_instance_show(struct kobject * kobj,struct attribute * attr,char * buffer)97 static 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 */
edac_pci_instance_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t count)109 static 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 */
122 static 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) \
128 static struct instance_attribute attr_instance_##_name = { \
129 .attr = {.name = __stringify(_name), .mode = _mode }, \
130 .show = _show, \
131 .store = _store, \
132 };
133
134 INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
135 INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
136
137 /* pci instance attributes */
138 static struct attribute *pci_instance_attrs[] = {
139 &attr_instance_pe_count.attr,
140 &attr_instance_npe_count.attr,
141 NULL
142 };
143 ATTRIBUTE_GROUPS(pci_instance);
144
145 /* the ktype for a pci instance */
146 static 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 */
edac_pci_create_instance_kobj(struct edac_pci_ctl_info * pci,int idx)157 static 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 */
189 error_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 */
edac_pci_unregister_sysfs_instance_kobj(struct edac_pci_ctl_info * pci)198 static 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 */
edac_pci_int_show(void * ptr,char * buffer)215 static ssize_t edac_pci_int_show(void *ptr, char *buffer)
216 {
217 int *value = ptr;
218 return sprintf(buffer, "%d\n", *value);
219 }
220
edac_pci_int_store(void * ptr,const char * buffer,size_t count)221 static 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
231 struct 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 */
edac_pci_dev_show(struct kobject * kobj,struct attribute * attr,char * buffer)239 static 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
edac_pci_dev_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t count)250 static 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
262 static 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) \
268 static 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) \
276 static 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 */
284 EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
285 edac_pci_int_store);
286 EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
287 edac_pci_int_store);
288 EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
289 edac_pci_int_store);
290 EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
291 edac_pci_int_store);
292 EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
293 EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
294
295 /* Base Attributes of the memory ECC object */
296 static 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 };
305 ATTRIBUTE_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 */
edac_pci_release_main_kobj(struct kobject * kobj)316 static 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 */
329 static 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 */
edac_pci_main_kobj_setup(void)338 static int edac_pci_main_kobj_setup(void)
339 {
340 int err = -ENODEV;
341 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 */
394 kobject_init_and_add_fail:
395 kobject_put(edac_pci_top_main_kobj);
396
397 kzalloc_fail:
398 module_put(THIS_MODULE);
399
400 decrement_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 */
edac_pci_main_kobj_teardown(void)413 static 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
edac_pci_create_sysfs(struct edac_pci_ctl_info * pci)427 int 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 */
453 symlink_fail:
454 edac_pci_unregister_sysfs_instance_kobj(pci);
455
456 unregister_cleanup:
457 edac_pci_main_kobj_teardown();
458
459 return err;
460 }
461
edac_pci_remove_sysfs(struct edac_pci_ctl_info * pci)462 void 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 *************************/
get_pci_parity_status(struct pci_dev * dev,int secondary)481 static 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. */
edac_pci_dev_parity_clear(struct pci_dev * dev)515 static 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 & 0x7F) == 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 */
edac_pci_dev_parity_test(struct pci_dev * dev)535 static 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 & 0x7F) == 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 */
624 typedef 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 */
edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)632 static 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 */
edac_pci_do_parity_check(void)645 void 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 */
edac_pci_clear_parity_errors(void)678 void 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 */
edac_pci_handle_pe(struct edac_pci_ctl_info * pci,const char * msg)691 void 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 }
708 EXPORT_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 */
edac_pci_handle_npe(struct edac_pci_ctl_info * pci,const char * msg)716 void 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 }
733 EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
734
735 /*
736 * Define the PCI parameter to the module
737 */
738 module_param(check_pci_errors, int, 0644);
739 MODULE_PARM_DESC(check_pci_errors,
740 "Check for PCI bus parity errors: 0=off 1=on");
741 module_param(edac_pci_panic_on_pe, int, 0644);
742 MODULE_PARM_DESC(edac_pci_panic_on_pe,
743 "Panic on PCI Bus Parity error: 0=off 1=on");
744