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 */ |
33 | int edac_pci_get_check_errors(void) |
34 | { |
35 | return check_pci_errors; |
36 | } |
37 | |
38 | static int edac_pci_get_log_pe(void) |
39 | { |
40 | return edac_pci_log_pe; |
41 | } |
42 | |
43 | static int edac_pci_get_log_npe(void) |
44 | { |
45 | return edac_pci_log_npe; |
46 | } |
47 | |
48 | static int edac_pci_get_panic_on_pe(void) |
49 | { |
50 | return edac_pci_panic_on_pe; |
51 | } |
52 | |
53 | int edac_pci_get_poll_msec(void) |
54 | { |
55 | return edac_pci_poll_msec; |
56 | } |
57 | |
58 | /**************************** EDAC PCI sysfs instance *******************/ |
59 | static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data) |
60 | { |
61 | return sprintf(buf: data, fmt: "%u\n" , atomic_read(v: &pci->counters.pe_count)); |
62 | } |
63 | |
64 | static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci, |
65 | char *data) |
66 | { |
67 | return sprintf(buf: data, fmt: "%u\n" , atomic_read(v: &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 */ |
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(kobj: edac_pci_top_main_kobj); |
85 | |
86 | kfree(objp: 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 */ |
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 */ |
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 | */ |
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(kobj: 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(kobj: &pci->kobj, ktype: &ktype_pci_instance, |
176 | parent: edac_pci_top_main_kobj, fmt: "pci%d" , idx); |
177 | if (err != 0) { |
178 | edac_dbg(2, "failed to register instance pci%d\n" , idx); |
179 | kobject_put(kobj: edac_pci_top_main_kobj); |
180 | goto error_out; |
181 | } |
182 | |
183 | kobject_uevent(kobj: &pci->kobj, action: 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 | */ |
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(kobj: &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 */ |
215 | static ssize_t edac_pci_int_show(void *ptr, char *buffer) |
216 | { |
217 | int *value = ptr; |
218 | return sprintf(buf: buffer, fmt: "%d\n" , *value); |
219 | } |
220 | |
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(c: *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 */ |
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 | |
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 | */ |
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(objp: 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 | */ |
338 | static 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(v: &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(size: 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(bus: edac_subsys); |
373 | if (dev_root) { |
374 | err = kobject_init_and_add(kobj: edac_pci_top_main_kobj, |
375 | ktype: &ktype_edac_pci_main_kobj, |
376 | parent: &dev_root->kobj, fmt: "pci" ); |
377 | put_device(dev: 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(kobj: edac_pci_top_main_kobj, action: 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(kobj: 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(v: &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 | */ |
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(v: &edac_pci_sysfs_refcount) == 0) { |
422 | edac_dbg(0, "called kobject_put on main kobj\n" ); |
423 | kobject_put(kobj: edac_pci_top_main_kobj); |
424 | } |
425 | } |
426 | |
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, idx: pci->pci_idx); |
441 | if (err) |
442 | goto unregister_cleanup; |
443 | |
444 | err = sysfs_create_link(kobj: edac_kobj, target: &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 | |
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(kobj: &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 *************************/ |
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, val: &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, where: 0, val: &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, val: status); |
509 | |
510 | return status; |
511 | } |
512 | |
513 | |
514 | /* Clear any PCI parity errors logged by this device. */ |
515 | static void edac_pci_dev_parity_clear(struct pci_dev *dev) |
516 | { |
517 | u8 ; |
518 | |
519 | get_pci_parity_status(dev, secondary: 0); |
520 | |
521 | /* read the device TYPE, looking for bridges */ |
522 | pci_read_config_byte(dev, PCI_HEADER_TYPE, val: &header_type); |
523 | |
524 | if ((header_type & PCI_HEADER_TYPE_MASK) == PCI_HEADER_TYPE_BRIDGE) |
525 | get_pci_parity_status(dev, secondary: 1); |
526 | } |
527 | |
528 | /* |
529 | * PCI Parity polling |
530 | * |
531 | * Function to retrieve the current parity status |
532 | * and decode it |
533 | * |
534 | */ |
535 | static void edac_pci_dev_parity_test(struct pci_dev *dev) |
536 | { |
537 | unsigned long flags; |
538 | u16 status; |
539 | u8 ; |
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, secondary: 0); |
546 | |
547 | /* read the device TYPE, looking for bridges */ |
548 | pci_read_config_byte(dev, PCI_HEADER_TYPE, val: &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(v: &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(v: &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(v: &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, secondary: 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(v: &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(v: &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(v: &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 | */ |
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 | */ |
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(v: &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(fn: 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(v: &pci_parity_count)) |
668 | panic(fmt: "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 | */ |
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(fn: edac_pci_dev_parity_clear); |
684 | } |
685 | |
686 | /* |
687 | * edac_pci_handle_pe |
688 | * |
689 | * Called to handle a PARITY ERROR event |
690 | */ |
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(v: &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 | */ |
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(v: &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 | |