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_core.h"
15 #include "edac_module.h"
16
17 /* Turn off this whole feature if PCI is not configured */
18 #ifdef CONFIG_PCI
19
20 #define EDAC_PCI_SYMLINK "device"
21
22 /* data variables exported via sysfs */
23 static int check_pci_errors; /* default NO check PCI parity */
24 static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
25 static int edac_pci_log_pe = 1; /* log PCI parity errors */
26 static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
27 static int edac_pci_poll_msec = 1000; /* one second workq period */
28
29 static atomic_t pci_parity_count = ATOMIC_INIT(0);
30 static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
31
32 static struct kobject *edac_pci_top_main_kobj;
33 static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
34
35 /* getter functions for the data variables */
edac_pci_get_check_errors(void)36 int edac_pci_get_check_errors(void)
37 {
38 return check_pci_errors;
39 }
40
edac_pci_get_log_pe(void)41 static int edac_pci_get_log_pe(void)
42 {
43 return edac_pci_log_pe;
44 }
45
edac_pci_get_log_npe(void)46 static int edac_pci_get_log_npe(void)
47 {
48 return edac_pci_log_npe;
49 }
50
edac_pci_get_panic_on_pe(void)51 static int edac_pci_get_panic_on_pe(void)
52 {
53 return edac_pci_panic_on_pe;
54 }
55
edac_pci_get_poll_msec(void)56 int edac_pci_get_poll_msec(void)
57 {
58 return edac_pci_poll_msec;
59 }
60
61 /**************************** EDAC PCI sysfs instance *******************/
instance_pe_count_show(struct edac_pci_ctl_info * pci,char * data)62 static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
63 {
64 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
65 }
66
instance_npe_count_show(struct edac_pci_ctl_info * pci,char * data)67 static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
68 char *data)
69 {
70 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
71 }
72
73 #define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
74 #define to_instance_attr(a) container_of(a, struct instance_attribute, attr)
75
76 /* DEVICE instance kobject release() function */
edac_pci_instance_release(struct kobject * kobj)77 static void edac_pci_instance_release(struct kobject *kobj)
78 {
79 struct edac_pci_ctl_info *pci;
80
81 debugf0("%s()\n", __func__);
82
83 /* Form pointer to containing struct, the pci control struct */
84 pci = to_instance(kobj);
85
86 /* decrement reference count on top main kobj */
87 kobject_put(edac_pci_top_main_kobj);
88
89 kfree(pci); /* Free the control struct */
90 }
91
92 /* instance specific attribute structure */
93 struct instance_attribute {
94 struct attribute attr;
95 ssize_t(*show) (struct edac_pci_ctl_info *, char *);
96 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
97 };
98
99 /* Function to 'show' fields from the edac_pci 'instance' structure */
edac_pci_instance_show(struct kobject * kobj,struct attribute * attr,char * buffer)100 static ssize_t edac_pci_instance_show(struct kobject *kobj,
101 struct attribute *attr, char *buffer)
102 {
103 struct edac_pci_ctl_info *pci = to_instance(kobj);
104 struct instance_attribute *instance_attr = to_instance_attr(attr);
105
106 if (instance_attr->show)
107 return instance_attr->show(pci, buffer);
108 return -EIO;
109 }
110
111 /* 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)112 static ssize_t edac_pci_instance_store(struct kobject *kobj,
113 struct attribute *attr,
114 const char *buffer, size_t count)
115 {
116 struct edac_pci_ctl_info *pci = to_instance(kobj);
117 struct instance_attribute *instance_attr = to_instance_attr(attr);
118
119 if (instance_attr->store)
120 return instance_attr->store(pci, buffer, count);
121 return -EIO;
122 }
123
124 /* fs_ops table */
125 static const struct sysfs_ops pci_instance_ops = {
126 .show = edac_pci_instance_show,
127 .store = edac_pci_instance_store
128 };
129
130 #define INSTANCE_ATTR(_name, _mode, _show, _store) \
131 static struct instance_attribute attr_instance_##_name = { \
132 .attr = {.name = __stringify(_name), .mode = _mode }, \
133 .show = _show, \
134 .store = _store, \
135 };
136
137 INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
138 INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
139
140 /* pci instance attributes */
141 static struct instance_attribute *pci_instance_attr[] = {
142 &attr_instance_pe_count,
143 &attr_instance_npe_count,
144 NULL
145 };
146
147 /* the ktype for a pci instance */
148 static struct kobj_type ktype_pci_instance = {
149 .release = edac_pci_instance_release,
150 .sysfs_ops = &pci_instance_ops,
151 .default_attrs = (struct attribute **)pci_instance_attr,
152 };
153
154 /*
155 * edac_pci_create_instance_kobj
156 *
157 * construct one EDAC PCI instance's kobject for use
158 */
edac_pci_create_instance_kobj(struct edac_pci_ctl_info * pci,int idx)159 static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
160 {
161 struct kobject *main_kobj;
162 int err;
163
164 debugf0("%s()\n", __func__);
165
166 /* First bump the ref count on the top main kobj, which will
167 * track the number of PCI instances we have, and thus nest
168 * properly on keeping the module loaded
169 */
170 main_kobj = kobject_get(edac_pci_top_main_kobj);
171 if (!main_kobj) {
172 err = -ENODEV;
173 goto error_out;
174 }
175
176 /* And now register this new kobject under the main kobj */
177 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
178 edac_pci_top_main_kobj, "pci%d", idx);
179 if (err != 0) {
180 debugf2("%s() failed to register instance pci%d\n",
181 __func__, idx);
182 kobject_put(edac_pci_top_main_kobj);
183 goto error_out;
184 }
185
186 kobject_uevent(&pci->kobj, KOBJ_ADD);
187 debugf1("%s() Register instance 'pci%d' kobject\n", __func__, idx);
188
189 return 0;
190
191 /* Error unwind statck */
192 error_out:
193 return err;
194 }
195
196 /*
197 * edac_pci_unregister_sysfs_instance_kobj
198 *
199 * unregister the kobj for the EDAC PCI instance
200 */
edac_pci_unregister_sysfs_instance_kobj(struct edac_pci_ctl_info * pci)201 static void edac_pci_unregister_sysfs_instance_kobj(
202 struct edac_pci_ctl_info *pci)
203 {
204 debugf0("%s()\n", __func__);
205
206 /* Unregister the instance kobject and allow its release
207 * function release the main reference count and then
208 * kfree the memory
209 */
210 kobject_put(&pci->kobj);
211 }
212
213 /***************************** EDAC PCI sysfs root **********************/
214 #define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj)
215 #define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr)
216
217 /* simple show/store functions for attributes */
edac_pci_int_show(void * ptr,char * buffer)218 static ssize_t edac_pci_int_show(void *ptr, char *buffer)
219 {
220 int *value = ptr;
221 return sprintf(buffer, "%d\n", *value);
222 }
223
edac_pci_int_store(void * ptr,const char * buffer,size_t count)224 static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
225 {
226 int *value = ptr;
227
228 if (isdigit(*buffer))
229 *value = simple_strtoul(buffer, NULL, 0);
230
231 return count;
232 }
233
234 struct edac_pci_dev_attribute {
235 struct attribute attr;
236 void *value;
237 ssize_t(*show) (void *, char *);
238 ssize_t(*store) (void *, const char *, size_t);
239 };
240
241 /* Set of show/store abstract level functions for PCI Parity object */
edac_pci_dev_show(struct kobject * kobj,struct attribute * attr,char * buffer)242 static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
243 char *buffer)
244 {
245 struct edac_pci_dev_attribute *edac_pci_dev;
246 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
247
248 if (edac_pci_dev->show)
249 return edac_pci_dev->show(edac_pci_dev->value, buffer);
250 return -EIO;
251 }
252
edac_pci_dev_store(struct kobject * kobj,struct attribute * attr,const char * buffer,size_t count)253 static ssize_t edac_pci_dev_store(struct kobject *kobj,
254 struct attribute *attr, const char *buffer,
255 size_t count)
256 {
257 struct edac_pci_dev_attribute *edac_pci_dev;
258 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
259
260 if (edac_pci_dev->store)
261 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
262 return -EIO;
263 }
264
265 static const struct sysfs_ops edac_pci_sysfs_ops = {
266 .show = edac_pci_dev_show,
267 .store = edac_pci_dev_store
268 };
269
270 #define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
271 static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
272 .attr = {.name = __stringify(_name), .mode = _mode }, \
273 .value = &_name, \
274 .show = _show, \
275 .store = _store, \
276 };
277
278 #define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \
279 static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
280 .attr = {.name = __stringify(_name), .mode = _mode }, \
281 .value = _data, \
282 .show = _show, \
283 .store = _store, \
284 };
285
286 /* PCI Parity control files */
287 EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
288 edac_pci_int_store);
289 EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
290 edac_pci_int_store);
291 EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
292 edac_pci_int_store);
293 EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
294 edac_pci_int_store);
295 EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
296 EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
297
298 /* Base Attributes of the memory ECC object */
299 static struct edac_pci_dev_attribute *edac_pci_attr[] = {
300 &edac_pci_attr_check_pci_errors,
301 &edac_pci_attr_edac_pci_log_pe,
302 &edac_pci_attr_edac_pci_log_npe,
303 &edac_pci_attr_edac_pci_panic_on_pe,
304 &edac_pci_attr_pci_parity_count,
305 &edac_pci_attr_pci_nonparity_count,
306 NULL,
307 };
308
309 /*
310 * edac_pci_release_main_kobj
311 *
312 * This release function is called when the reference count to the
313 * passed kobj goes to zero.
314 *
315 * This kobj is the 'main' kobject that EDAC PCI instances
316 * link to, and thus provide for proper nesting counts
317 */
edac_pci_release_main_kobj(struct kobject * kobj)318 static void edac_pci_release_main_kobj(struct kobject *kobj)
319 {
320 debugf0("%s() here to module_put(THIS_MODULE)\n", __func__);
321
322 kfree(kobj);
323
324 /* last reference to top EDAC PCI kobject has been removed,
325 * NOW release our ref count on the core module
326 */
327 module_put(THIS_MODULE);
328 }
329
330 /* ktype struct for the EDAC PCI main kobj */
331 static struct kobj_type ktype_edac_pci_main_kobj = {
332 .release = edac_pci_release_main_kobj,
333 .sysfs_ops = &edac_pci_sysfs_ops,
334 .default_attrs = (struct attribute **)edac_pci_attr,
335 };
336
337 /**
338 * edac_pci_main_kobj_setup()
339 *
340 * setup the sysfs for EDAC PCI attributes
341 * assumes edac_subsys has already been initialized
342 */
edac_pci_main_kobj_setup(void)343 static int edac_pci_main_kobj_setup(void)
344 {
345 int err;
346 struct bus_type *edac_subsys;
347
348 debugf0("%s()\n", __func__);
349
350 /* check and count if we have already created the main kobject */
351 if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
352 return 0;
353
354 /* First time, so create the main kobject and its
355 * controls and attributes
356 */
357 edac_subsys = edac_get_sysfs_subsys();
358 if (edac_subsys == NULL) {
359 debugf1("%s() no edac_subsys\n", __func__);
360 err = -ENODEV;
361 goto decrement_count_fail;
362 }
363
364 /* Bump the reference count on this module to ensure the
365 * modules isn't unloaded until we deconstruct the top
366 * level main kobj for EDAC PCI
367 */
368 if (!try_module_get(THIS_MODULE)) {
369 debugf1("%s() try_module_get() failed\n", __func__);
370 err = -ENODEV;
371 goto mod_get_fail;
372 }
373
374 edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
375 if (!edac_pci_top_main_kobj) {
376 debugf1("Failed to allocate\n");
377 err = -ENOMEM;
378 goto kzalloc_fail;
379 }
380
381 /* Instanstiate the pci object */
382 err = kobject_init_and_add(edac_pci_top_main_kobj,
383 &ktype_edac_pci_main_kobj,
384 &edac_subsys->dev_root->kobj, "pci");
385 if (err) {
386 debugf1("Failed to register '.../edac/pci'\n");
387 goto kobject_init_and_add_fail;
388 }
389
390 /* At this point, to 'release' the top level kobject
391 * for EDAC PCI, then edac_pci_main_kobj_teardown()
392 * must be used, for resources to be cleaned up properly
393 */
394 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
395 debugf1("Registered '.../edac/pci' kobject\n");
396
397 return 0;
398
399 /* Error unwind statck */
400 kobject_init_and_add_fail:
401 kfree(edac_pci_top_main_kobj);
402
403 kzalloc_fail:
404 module_put(THIS_MODULE);
405
406 mod_get_fail:
407 edac_put_sysfs_subsys();
408
409 decrement_count_fail:
410 /* if are on this error exit, nothing to tear down */
411 atomic_dec(&edac_pci_sysfs_refcount);
412
413 return err;
414 }
415
416 /*
417 * edac_pci_main_kobj_teardown()
418 *
419 * if no longer linked (needed) remove the top level EDAC PCI
420 * kobject with its controls and attributes
421 */
edac_pci_main_kobj_teardown(void)422 static void edac_pci_main_kobj_teardown(void)
423 {
424 debugf0("%s()\n", __func__);
425
426 /* Decrement the count and only if no more controller instances
427 * are connected perform the unregisteration of the top level
428 * main kobj
429 */
430 if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
431 debugf0("%s() called kobject_put on main kobj\n",
432 __func__);
433 kobject_put(edac_pci_top_main_kobj);
434 }
435 edac_put_sysfs_subsys();
436 }
437
438 /*
439 *
440 * edac_pci_create_sysfs
441 *
442 * Create the controls/attributes for the specified EDAC PCI device
443 */
edac_pci_create_sysfs(struct edac_pci_ctl_info * pci)444 int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
445 {
446 int err;
447 struct kobject *edac_kobj = &pci->kobj;
448
449 debugf0("%s() idx=%d\n", __func__, pci->pci_idx);
450
451 /* create the top main EDAC PCI kobject, IF needed */
452 err = edac_pci_main_kobj_setup();
453 if (err)
454 return err;
455
456 /* Create this instance's kobject under the MAIN kobject */
457 err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
458 if (err)
459 goto unregister_cleanup;
460
461 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
462 if (err) {
463 debugf0("%s() sysfs_create_link() returned err= %d\n",
464 __func__, err);
465 goto symlink_fail;
466 }
467
468 return 0;
469
470 /* Error unwind stack */
471 symlink_fail:
472 edac_pci_unregister_sysfs_instance_kobj(pci);
473
474 unregister_cleanup:
475 edac_pci_main_kobj_teardown();
476
477 return err;
478 }
479
480 /*
481 * edac_pci_remove_sysfs
482 *
483 * remove the controls and attributes for this EDAC PCI device
484 */
edac_pci_remove_sysfs(struct edac_pci_ctl_info * pci)485 void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
486 {
487 debugf0("%s() index=%d\n", __func__, pci->pci_idx);
488
489 /* Remove the symlink */
490 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
491
492 /* remove this PCI instance's sysfs entries */
493 edac_pci_unregister_sysfs_instance_kobj(pci);
494
495 /* Call the main unregister function, which will determine
496 * if this 'pci' is the last instance.
497 * If it is, the main kobject will be unregistered as a result
498 */
499 debugf0("%s() calling edac_pci_main_kobj_teardown()\n", __func__);
500 edac_pci_main_kobj_teardown();
501 }
502
503 /************************ PCI error handling *************************/
get_pci_parity_status(struct pci_dev * dev,int secondary)504 static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
505 {
506 int where;
507 u16 status;
508
509 where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
510 pci_read_config_word(dev, where, &status);
511
512 /* If we get back 0xFFFF then we must suspect that the card has been
513 * pulled but the Linux PCI layer has not yet finished cleaning up.
514 * We don't want to report on such devices
515 */
516
517 if (status == 0xFFFF) {
518 u32 sanity;
519
520 pci_read_config_dword(dev, 0, &sanity);
521
522 if (sanity == 0xFFFFFFFF)
523 return 0;
524 }
525
526 status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
527 PCI_STATUS_PARITY;
528
529 if (status)
530 /* reset only the bits we are interested in */
531 pci_write_config_word(dev, where, status);
532
533 return status;
534 }
535
536
537 /* Clear any PCI parity errors logged by this device. */
edac_pci_dev_parity_clear(struct pci_dev * dev)538 static void edac_pci_dev_parity_clear(struct pci_dev *dev)
539 {
540 u8 header_type;
541
542 get_pci_parity_status(dev, 0);
543
544 /* read the device TYPE, looking for bridges */
545 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
546
547 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
548 get_pci_parity_status(dev, 1);
549 }
550
551 /*
552 * PCI Parity polling
553 *
554 * Function to retrieve the current parity status
555 * and decode it
556 *
557 */
edac_pci_dev_parity_test(struct pci_dev * dev)558 static void edac_pci_dev_parity_test(struct pci_dev *dev)
559 {
560 unsigned long flags;
561 u16 status;
562 u8 header_type;
563
564 /* stop any interrupts until we can acquire the status */
565 local_irq_save(flags);
566
567 /* read the STATUS register on this device */
568 status = get_pci_parity_status(dev, 0);
569
570 /* read the device TYPE, looking for bridges */
571 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
572
573 local_irq_restore(flags);
574
575 debugf4("PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
576
577 /* check the status reg for errors on boards NOT marked as broken
578 * if broken, we cannot trust any of the status bits
579 */
580 if (status && !dev->broken_parity_status) {
581 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
582 edac_printk(KERN_CRIT, EDAC_PCI,
583 "Signaled System Error on %s\n",
584 pci_name(dev));
585 atomic_inc(&pci_nonparity_count);
586 }
587
588 if (status & (PCI_STATUS_PARITY)) {
589 edac_printk(KERN_CRIT, EDAC_PCI,
590 "Master Data Parity Error on %s\n",
591 pci_name(dev));
592
593 atomic_inc(&pci_parity_count);
594 }
595
596 if (status & (PCI_STATUS_DETECTED_PARITY)) {
597 edac_printk(KERN_CRIT, EDAC_PCI,
598 "Detected Parity Error on %s\n",
599 pci_name(dev));
600
601 atomic_inc(&pci_parity_count);
602 }
603 }
604
605
606 debugf4("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev_name(&dev->dev));
607
608 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
609 /* On bridges, need to examine secondary status register */
610 status = get_pci_parity_status(dev, 1);
611
612 debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
613
614 /* check the secondary status reg for errors,
615 * on NOT broken boards
616 */
617 if (status && !dev->broken_parity_status) {
618 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
619 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
620 "Signaled System Error on %s\n",
621 pci_name(dev));
622 atomic_inc(&pci_nonparity_count);
623 }
624
625 if (status & (PCI_STATUS_PARITY)) {
626 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
627 "Master Data Parity Error on "
628 "%s\n", pci_name(dev));
629
630 atomic_inc(&pci_parity_count);
631 }
632
633 if (status & (PCI_STATUS_DETECTED_PARITY)) {
634 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
635 "Detected Parity Error on %s\n",
636 pci_name(dev));
637
638 atomic_inc(&pci_parity_count);
639 }
640 }
641 }
642 }
643
644 /* reduce some complexity in definition of the iterator */
645 typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
646
647 /*
648 * pci_dev parity list iterator
649 * Scan the PCI device list for one pass, looking for SERRORs
650 * Master Parity ERRORS or Parity ERRORs on primary or secondary devices
651 */
edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)652 static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
653 {
654 struct pci_dev *dev = NULL;
655
656 /* request for kernel access to the next PCI device, if any,
657 * and while we are looking at it have its reference count
658 * bumped until we are done with it
659 */
660 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
661 fn(dev);
662 }
663 }
664
665 /*
666 * edac_pci_do_parity_check
667 *
668 * performs the actual PCI parity check operation
669 */
edac_pci_do_parity_check(void)670 void edac_pci_do_parity_check(void)
671 {
672 int before_count;
673
674 debugf3("%s()\n", __func__);
675
676 /* if policy has PCI check off, leave now */
677 if (!check_pci_errors)
678 return;
679
680 before_count = atomic_read(&pci_parity_count);
681
682 /* scan all PCI devices looking for a Parity Error on devices and
683 * bridges.
684 * The iterator calls pci_get_device() which might sleep, thus
685 * we cannot disable interrupts in this scan.
686 */
687 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
688
689 /* Only if operator has selected panic on PCI Error */
690 if (edac_pci_get_panic_on_pe()) {
691 /* If the count is different 'after' from 'before' */
692 if (before_count != atomic_read(&pci_parity_count))
693 panic("EDAC: PCI Parity Error");
694 }
695 }
696
697 /*
698 * edac_pci_clear_parity_errors
699 *
700 * function to perform an iteration over the PCI devices
701 * and clearn their current status
702 */
edac_pci_clear_parity_errors(void)703 void edac_pci_clear_parity_errors(void)
704 {
705 /* Clear any PCI bus parity errors that devices initially have logged
706 * in their registers.
707 */
708 edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
709 }
710
711 /*
712 * edac_pci_handle_pe
713 *
714 * Called to handle a PARITY ERROR event
715 */
edac_pci_handle_pe(struct edac_pci_ctl_info * pci,const char * msg)716 void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
717 {
718
719 /* global PE counter incremented by edac_pci_do_parity_check() */
720 atomic_inc(&pci->counters.pe_count);
721
722 if (edac_pci_get_log_pe())
723 edac_pci_printk(pci, KERN_WARNING,
724 "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_pe);
734
735
736 /*
737 * edac_pci_handle_npe
738 *
739 * Called to handle a NON-PARITY ERROR event
740 */
edac_pci_handle_npe(struct edac_pci_ctl_info * pci,const char * msg)741 void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
742 {
743
744 /* global NPE counter incremented by edac_pci_do_parity_check() */
745 atomic_inc(&pci->counters.npe_count);
746
747 if (edac_pci_get_log_npe())
748 edac_pci_printk(pci, KERN_WARNING,
749 "Non-Parity Error ctl: %s %d: %s\n",
750 pci->ctl_name, pci->pci_idx, msg);
751
752 /*
753 * poke all PCI devices and see which one is the troublemaker
754 * panic() is called if set
755 */
756 edac_pci_do_parity_check();
757 }
758 EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
759
760 /*
761 * Define the PCI parameter to the module
762 */
763 module_param(check_pci_errors, int, 0644);
764 MODULE_PARM_DESC(check_pci_errors,
765 "Check for PCI bus parity errors: 0=off 1=on");
766 module_param(edac_pci_panic_on_pe, int, 0644);
767 MODULE_PARM_DESC(edac_pci_panic_on_pe,
768 "Panic on PCI Bus Parity error: 0=off 1=on");
769
770 #endif /* CONFIG_PCI */
771