Commit | Line | Data |
---|---|---|
20bcb7a8 | 1 | /* |
7c9281d7 DT |
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/sysdev.h> | |
11 | #include <linux/ctype.h> | |
12 | ||
20bcb7a8 | 13 | #include "edac_core.h" |
7c9281d7 DT |
14 | #include "edac_module.h" |
15 | ||
7c9281d7 | 16 | #ifdef CONFIG_PCI |
91b99041 DJ |
17 | |
18 | #define EDAC_PCI_SYMLINK "device" | |
19 | ||
f044091c DT |
20 | static int check_pci_errors; /* default YES check PCI parity */ |
21 | static int edac_pci_panic_on_pe; /* default no panic on PCI Parity */ | |
4de78c68 DJ |
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 */ | |
7c9281d7 | 24 | static atomic_t pci_parity_count = ATOMIC_INIT(0); |
91b99041 | 25 | static atomic_t pci_nonparity_count = ATOMIC_INIT(0); |
4de78c68 | 26 | static int edac_pci_poll_msec = 1000; |
7c9281d7 | 27 | |
079708b9 | 28 | static struct kobject edac_pci_kobj; /* /sys/devices/system/edac/pci */ |
7c9281d7 | 29 | static struct completion edac_pci_kobj_complete; |
91b99041 DJ |
30 | static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0); |
31 | ||
4de78c68 DJ |
32 | int edac_pci_get_check_errors(void) |
33 | { | |
34 | return check_pci_errors; | |
35 | } | |
36 | ||
37 | int edac_pci_get_log_pe(void) | |
38 | { | |
39 | return edac_pci_log_pe; | |
40 | } | |
41 | ||
42 | int edac_pci_get_log_npe(void) | |
43 | { | |
44 | return edac_pci_log_npe; | |
45 | } | |
46 | ||
47 | int edac_pci_get_panic_on_pe(void) | |
48 | { | |
49 | return edac_pci_panic_on_pe; | |
50 | } | |
51 | ||
52 | int edac_pci_get_poll_msec(void) | |
53 | { | |
54 | return edac_pci_poll_msec; | |
55 | } | |
56 | ||
91b99041 DJ |
57 | /**************************** EDAC PCI sysfs instance *******************/ |
58 | static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data) | |
59 | { | |
079708b9 | 60 | return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count)); |
91b99041 DJ |
61 | } |
62 | ||
63 | static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci, | |
052dfb45 | 64 | char *data) |
91b99041 | 65 | { |
079708b9 | 66 | return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count)); |
91b99041 DJ |
67 | } |
68 | ||
69 | #define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj) | |
70 | #define to_instance_attr(a) container_of(a, struct instance_attribute, attr) | |
71 | ||
72 | /* DEVICE instance kobject release() function */ | |
73 | static void edac_pci_instance_release(struct kobject *kobj) | |
74 | { | |
75 | struct edac_pci_ctl_info *pci; | |
76 | ||
77 | debugf1("%s()\n", __func__); | |
78 | ||
79 | pci = to_instance(kobj); | |
80 | complete(&pci->kobj_complete); | |
81 | } | |
82 | ||
83 | /* instance specific attribute structure */ | |
84 | struct instance_attribute { | |
079708b9 DT |
85 | struct attribute attr; |
86 | ssize_t(*show) (struct edac_pci_ctl_info *, char *); | |
87 | ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t); | |
91b99041 DJ |
88 | }; |
89 | ||
90 | /* Function to 'show' fields from the edac_pci 'instance' structure */ | |
91 | static ssize_t edac_pci_instance_show(struct kobject *kobj, | |
052dfb45 | 92 | struct attribute *attr, char *buffer) |
91b99041 | 93 | { |
079708b9 DT |
94 | struct edac_pci_ctl_info *pci = to_instance(kobj); |
95 | struct instance_attribute *instance_attr = to_instance_attr(attr); | |
91b99041 | 96 | |
079708b9 DT |
97 | if (instance_attr->show) |
98 | return instance_attr->show(pci, buffer); | |
99 | return -EIO; | |
91b99041 DJ |
100 | } |
101 | ||
91b99041 DJ |
102 | /* Function to 'store' fields into the edac_pci 'instance' structure */ |
103 | static ssize_t edac_pci_instance_store(struct kobject *kobj, | |
052dfb45 DT |
104 | struct attribute *attr, |
105 | const char *buffer, size_t count) | |
91b99041 | 106 | { |
079708b9 DT |
107 | struct edac_pci_ctl_info *pci = to_instance(kobj); |
108 | struct instance_attribute *instance_attr = to_instance_attr(attr); | |
91b99041 | 109 | |
079708b9 DT |
110 | if (instance_attr->store) |
111 | return instance_attr->store(pci, buffer, count); | |
112 | return -EIO; | |
91b99041 DJ |
113 | } |
114 | ||
115 | static struct sysfs_ops pci_instance_ops = { | |
116 | .show = edac_pci_instance_show, | |
117 | .store = edac_pci_instance_store | |
118 | }; | |
119 | ||
120 | #define INSTANCE_ATTR(_name, _mode, _show, _store) \ | |
121 | static struct instance_attribute attr_instance_##_name = { \ | |
122 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
123 | .show = _show, \ | |
124 | .store = _store, \ | |
125 | }; | |
126 | ||
127 | INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL); | |
128 | INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL); | |
129 | ||
130 | /* pci instance attributes */ | |
131 | static struct instance_attribute *pci_instance_attr[] = { | |
132 | &attr_instance_pe_count, | |
133 | &attr_instance_npe_count, | |
134 | NULL | |
135 | }; | |
7c9281d7 | 136 | |
91b99041 DJ |
137 | /* the ktype for pci instance */ |
138 | static struct kobj_type ktype_pci_instance = { | |
139 | .release = edac_pci_instance_release, | |
140 | .sysfs_ops = &pci_instance_ops, | |
141 | .default_attrs = (struct attribute **)pci_instance_attr, | |
142 | }; | |
143 | ||
144 | static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx) | |
145 | { | |
146 | int err; | |
147 | ||
148 | pci->kobj.parent = &edac_pci_kobj; | |
149 | pci->kobj.ktype = &ktype_pci_instance; | |
150 | ||
151 | err = kobject_set_name(&pci->kobj, "pci%d", idx); | |
152 | if (err) | |
153 | return err; | |
154 | ||
155 | err = kobject_register(&pci->kobj); | |
156 | if (err != 0) { | |
157 | debugf2("%s() failed to register instance pci%d\n", | |
079708b9 | 158 | __func__, idx); |
91b99041 DJ |
159 | return err; |
160 | } | |
161 | ||
162 | debugf1("%s() Register instance 'pci%d' kobject\n", __func__, idx); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static void | |
168 | edac_pci_delete_instance_kobj(struct edac_pci_ctl_info *pci, int idx) | |
169 | { | |
170 | init_completion(&pci->kobj_complete); | |
171 | kobject_unregister(&pci->kobj); | |
172 | wait_for_completion(&pci->kobj_complete); | |
173 | } | |
174 | ||
175 | /***************************** EDAC PCI sysfs root **********************/ | |
176 | #define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj) | |
177 | #define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr) | |
7c9281d7 DT |
178 | |
179 | static ssize_t edac_pci_int_show(void *ptr, char *buffer) | |
180 | { | |
181 | int *value = ptr; | |
079708b9 | 182 | return sprintf(buffer, "%d\n", *value); |
7c9281d7 DT |
183 | } |
184 | ||
185 | static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count) | |
186 | { | |
187 | int *value = ptr; | |
188 | ||
189 | if (isdigit(*buffer)) | |
079708b9 | 190 | *value = simple_strtoul(buffer, NULL, 0); |
7c9281d7 DT |
191 | |
192 | return count; | |
193 | } | |
194 | ||
195 | struct edac_pci_dev_attribute { | |
196 | struct attribute attr; | |
197 | void *value; | |
079708b9 DT |
198 | ssize_t(*show) (void *, char *); |
199 | ssize_t(*store) (void *, const char *, size_t); | |
7c9281d7 DT |
200 | }; |
201 | ||
202 | /* Set of show/store abstract level functions for PCI Parity object */ | |
203 | static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr, | |
079708b9 | 204 | char *buffer) |
7c9281d7 DT |
205 | { |
206 | struct edac_pci_dev_attribute *edac_pci_dev; | |
079708b9 | 207 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
7c9281d7 DT |
208 | |
209 | if (edac_pci_dev->show) | |
210 | return edac_pci_dev->show(edac_pci_dev->value, buffer); | |
211 | return -EIO; | |
212 | } | |
213 | ||
214 | static ssize_t edac_pci_dev_store(struct kobject *kobj, | |
052dfb45 DT |
215 | struct attribute *attr, const char *buffer, |
216 | size_t count) | |
7c9281d7 DT |
217 | { |
218 | struct edac_pci_dev_attribute *edac_pci_dev; | |
079708b9 | 219 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
7c9281d7 DT |
220 | |
221 | if (edac_pci_dev->show) | |
222 | return edac_pci_dev->store(edac_pci_dev->value, buffer, count); | |
223 | return -EIO; | |
224 | } | |
225 | ||
226 | static struct sysfs_ops edac_pci_sysfs_ops = { | |
079708b9 DT |
227 | .show = edac_pci_dev_show, |
228 | .store = edac_pci_dev_store | |
7c9281d7 DT |
229 | }; |
230 | ||
231 | #define EDAC_PCI_ATTR(_name,_mode,_show,_store) \ | |
232 | static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ | |
233 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
234 | .value = &_name, \ | |
235 | .show = _show, \ | |
236 | .store = _store, \ | |
237 | }; | |
238 | ||
239 | #define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \ | |
240 | static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ | |
241 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
242 | .value = _data, \ | |
243 | .show = _show, \ | |
244 | .store = _store, \ | |
245 | }; | |
246 | ||
247 | /* PCI Parity control files */ | |
079708b9 | 248 | EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 249 | edac_pci_int_store); |
079708b9 | 250 | EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 251 | edac_pci_int_store); |
079708b9 | 252 | EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 253 | edac_pci_int_store); |
079708b9 | 254 | EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 255 | edac_pci_int_store); |
7c9281d7 | 256 | EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL); |
91b99041 | 257 | EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL); |
7c9281d7 DT |
258 | |
259 | /* Base Attributes of the memory ECC object */ | |
260 | static struct edac_pci_dev_attribute *edac_pci_attr[] = { | |
91b99041 | 261 | &edac_pci_attr_check_pci_errors, |
4de78c68 DJ |
262 | &edac_pci_attr_edac_pci_log_pe, |
263 | &edac_pci_attr_edac_pci_log_npe, | |
264 | &edac_pci_attr_edac_pci_panic_on_pe, | |
7c9281d7 | 265 | &edac_pci_attr_pci_parity_count, |
91b99041 | 266 | &edac_pci_attr_pci_nonparity_count, |
7c9281d7 DT |
267 | NULL, |
268 | }; | |
269 | ||
270 | /* No memory to release */ | |
271 | static void edac_pci_release(struct kobject *kobj) | |
272 | { | |
91b99041 DJ |
273 | struct edac_pci_ctl_info *pci; |
274 | ||
275 | pci = to_edacpci(kobj); | |
276 | ||
7c9281d7 | 277 | debugf1("%s()\n", __func__); |
91b99041 | 278 | complete(&pci->kobj_complete); |
7c9281d7 DT |
279 | } |
280 | ||
281 | static struct kobj_type ktype_edac_pci = { | |
282 | .release = edac_pci_release, | |
283 | .sysfs_ops = &edac_pci_sysfs_ops, | |
079708b9 | 284 | .default_attrs = (struct attribute **)edac_pci_attr, |
7c9281d7 DT |
285 | }; |
286 | ||
287 | /** | |
288 | * edac_sysfs_pci_setup() | |
289 | * | |
290 | * setup the sysfs for EDAC PCI attributes | |
291 | * assumes edac_class has already been initialized | |
292 | */ | |
91b99041 | 293 | int edac_pci_register_main_kobj(void) |
7c9281d7 DT |
294 | { |
295 | int err; | |
296 | struct sysdev_class *edac_class; | |
297 | ||
298 | debugf1("%s()\n", __func__); | |
299 | ||
300 | edac_class = edac_get_edac_class(); | |
91b99041 DJ |
301 | if (edac_class == NULL) { |
302 | debugf1("%s() no edac_class\n", __func__); | |
303 | return -ENODEV; | |
304 | } | |
7c9281d7 | 305 | |
7c9281d7 | 306 | edac_pci_kobj.ktype = &ktype_edac_pci; |
91b99041 DJ |
307 | |
308 | edac_pci_kobj.parent = &edac_class->kset.kobj; | |
309 | ||
7c9281d7 | 310 | err = kobject_set_name(&edac_pci_kobj, "pci"); |
079708b9 | 311 | if (err) |
91b99041 | 312 | return err; |
7c9281d7 | 313 | |
91b99041 DJ |
314 | /* Instanstiate the pci object */ |
315 | /* FIXME: maybe new sysdev_create_subdir() */ | |
316 | err = kobject_register(&edac_pci_kobj); | |
7c9281d7 | 317 | |
91b99041 DJ |
318 | if (err) { |
319 | debugf1("Failed to register '.../edac/pci'\n"); | |
320 | return err; | |
7c9281d7 DT |
321 | } |
322 | ||
91b99041 DJ |
323 | debugf1("Registered '.../edac/pci' kobject\n"); |
324 | ||
325 | return 0; | |
7c9281d7 DT |
326 | } |
327 | ||
328 | /* | |
91b99041 | 329 | * edac_pci_unregister_main_kobj() |
7c9281d7 DT |
330 | * |
331 | * perform the sysfs teardown for the PCI attributes | |
332 | */ | |
91b99041 | 333 | void edac_pci_unregister_main_kobj(void) |
7c9281d7 DT |
334 | { |
335 | debugf0("%s()\n", __func__); | |
336 | init_completion(&edac_pci_kobj_complete); | |
337 | kobject_unregister(&edac_pci_kobj); | |
338 | wait_for_completion(&edac_pci_kobj_complete); | |
339 | } | |
340 | ||
91b99041 DJ |
341 | int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci) |
342 | { | |
343 | int err; | |
344 | struct kobject *edac_kobj = &pci->kobj; | |
345 | ||
346 | if (atomic_inc_return(&edac_pci_sysfs_refcount) == 1) { | |
347 | err = edac_pci_register_main_kobj(); | |
348 | if (err) { | |
349 | atomic_dec(&edac_pci_sysfs_refcount); | |
350 | return err; | |
351 | } | |
352 | } | |
353 | ||
354 | err = edac_pci_create_instance_kobj(pci, pci->pci_idx); | |
355 | if (err) { | |
356 | if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) | |
357 | edac_pci_unregister_main_kobj(); | |
358 | } | |
7c9281d7 | 359 | |
91b99041 DJ |
360 | debugf0("%s() idx=%d\n", __func__, pci->pci_idx); |
361 | ||
079708b9 | 362 | err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK); |
91b99041 DJ |
363 | if (err) { |
364 | debugf0("%s() sysfs_create_link() returned err= %d\n", | |
079708b9 | 365 | __func__, err); |
91b99041 DJ |
366 | return err; |
367 | } | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci) | |
373 | { | |
374 | debugf0("%s()\n", __func__); | |
375 | ||
376 | edac_pci_delete_instance_kobj(pci, pci->pci_idx); | |
377 | ||
378 | sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK); | |
379 | ||
380 | if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) | |
381 | edac_pci_unregister_main_kobj(); | |
382 | } | |
383 | ||
384 | /************************ PCI error handling *************************/ | |
7c9281d7 DT |
385 | static u16 get_pci_parity_status(struct pci_dev *dev, int secondary) |
386 | { | |
387 | int where; | |
388 | u16 status; | |
389 | ||
390 | where = secondary ? PCI_SEC_STATUS : PCI_STATUS; | |
391 | pci_read_config_word(dev, where, &status); | |
392 | ||
393 | /* If we get back 0xFFFF then we must suspect that the card has been | |
394 | * pulled but the Linux PCI layer has not yet finished cleaning up. | |
395 | * We don't want to report on such devices | |
396 | */ | |
397 | ||
398 | if (status == 0xFFFF) { | |
399 | u32 sanity; | |
400 | ||
401 | pci_read_config_dword(dev, 0, &sanity); | |
402 | ||
403 | if (sanity == 0xFFFFFFFF) | |
404 | return 0; | |
405 | } | |
406 | ||
407 | status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | | |
052dfb45 | 408 | PCI_STATUS_PARITY; |
7c9281d7 DT |
409 | |
410 | if (status) | |
411 | /* reset only the bits we are interested in */ | |
412 | pci_write_config_word(dev, where, status); | |
413 | ||
414 | return status; | |
415 | } | |
416 | ||
079708b9 | 417 | typedef void (*pci_parity_check_fn_t) (struct pci_dev * dev); |
7c9281d7 DT |
418 | |
419 | /* Clear any PCI parity errors logged by this device. */ | |
420 | static void edac_pci_dev_parity_clear(struct pci_dev *dev) | |
421 | { | |
422 | u8 header_type; | |
423 | ||
424 | get_pci_parity_status(dev, 0); | |
425 | ||
426 | /* read the device TYPE, looking for bridges */ | |
427 | pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); | |
428 | ||
429 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) | |
430 | get_pci_parity_status(dev, 1); | |
431 | } | |
432 | ||
433 | /* | |
434 | * PCI Parity polling | |
435 | * | |
436 | */ | |
437 | static void edac_pci_dev_parity_test(struct pci_dev *dev) | |
438 | { | |
439 | u16 status; | |
079708b9 | 440 | u8 header_type; |
7c9281d7 DT |
441 | |
442 | /* read the STATUS register on this device | |
443 | */ | |
444 | status = get_pci_parity_status(dev, 0); | |
445 | ||
079708b9 | 446 | debugf2("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id); |
7c9281d7 DT |
447 | |
448 | /* check the status reg for errors */ | |
449 | if (status) { | |
91b99041 | 450 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
7c9281d7 | 451 | edac_printk(KERN_CRIT, EDAC_PCI, |
052dfb45 DT |
452 | "Signaled System Error on %s\n", |
453 | pci_name(dev)); | |
91b99041 DJ |
454 | atomic_inc(&pci_nonparity_count); |
455 | } | |
7c9281d7 DT |
456 | |
457 | if (status & (PCI_STATUS_PARITY)) { | |
458 | edac_printk(KERN_CRIT, EDAC_PCI, | |
052dfb45 DT |
459 | "Master Data Parity Error on %s\n", |
460 | pci_name(dev)); | |
7c9281d7 DT |
461 | |
462 | atomic_inc(&pci_parity_count); | |
463 | } | |
464 | ||
465 | if (status & (PCI_STATUS_DETECTED_PARITY)) { | |
466 | edac_printk(KERN_CRIT, EDAC_PCI, | |
052dfb45 DT |
467 | "Detected Parity Error on %s\n", |
468 | pci_name(dev)); | |
7c9281d7 DT |
469 | |
470 | atomic_inc(&pci_parity_count); | |
471 | } | |
472 | } | |
473 | ||
474 | /* read the device TYPE, looking for bridges */ | |
475 | pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); | |
476 | ||
079708b9 | 477 | debugf2("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id); |
7c9281d7 DT |
478 | |
479 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { | |
480 | /* On bridges, need to examine secondary status register */ | |
481 | status = get_pci_parity_status(dev, 1); | |
482 | ||
079708b9 | 483 | debugf2("PCI SEC_STATUS= 0x%04x %s\n", status, dev->dev.bus_id); |
7c9281d7 DT |
484 | |
485 | /* check the secondary status reg for errors */ | |
486 | if (status) { | |
91b99041 | 487 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
7c9281d7 | 488 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " |
052dfb45 DT |
489 | "Signaled System Error on %s\n", |
490 | pci_name(dev)); | |
91b99041 DJ |
491 | atomic_inc(&pci_nonparity_count); |
492 | } | |
7c9281d7 DT |
493 | |
494 | if (status & (PCI_STATUS_PARITY)) { | |
495 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " | |
052dfb45 DT |
496 | "Master Data Parity Error on " |
497 | "%s\n", pci_name(dev)); | |
7c9281d7 DT |
498 | |
499 | atomic_inc(&pci_parity_count); | |
500 | } | |
501 | ||
502 | if (status & (PCI_STATUS_DETECTED_PARITY)) { | |
503 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " | |
052dfb45 DT |
504 | "Detected Parity Error on %s\n", |
505 | pci_name(dev)); | |
7c9281d7 DT |
506 | |
507 | atomic_inc(&pci_parity_count); | |
508 | } | |
509 | } | |
510 | } | |
511 | } | |
512 | ||
513 | /* | |
514 | * pci_dev parity list iterator | |
515 | * Scan the PCI device list for one iteration, looking for SERRORs | |
516 | * Master Parity ERRORS or Parity ERRORs on primary or secondary devices | |
517 | */ | |
518 | static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn) | |
519 | { | |
520 | struct pci_dev *dev = NULL; | |
521 | ||
522 | /* request for kernel access to the next PCI device, if any, | |
523 | * and while we are looking at it have its reference count | |
524 | * bumped until we are done with it | |
525 | */ | |
079708b9 | 526 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
7c9281d7 DT |
527 | fn(dev); |
528 | } | |
529 | } | |
530 | ||
531 | /* | |
532 | * edac_pci_do_parity_check | |
533 | * | |
534 | * performs the actual PCI parity check operation | |
535 | */ | |
536 | void edac_pci_do_parity_check(void) | |
537 | { | |
538 | unsigned long flags; | |
539 | int before_count; | |
540 | ||
541 | debugf3("%s()\n", __func__); | |
542 | ||
91b99041 | 543 | if (!check_pci_errors) |
7c9281d7 DT |
544 | return; |
545 | ||
546 | before_count = atomic_read(&pci_parity_count); | |
547 | ||
548 | /* scan all PCI devices looking for a Parity Error on devices and | |
549 | * bridges | |
550 | */ | |
551 | local_irq_save(flags); | |
552 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_test); | |
553 | local_irq_restore(flags); | |
554 | ||
555 | /* Only if operator has selected panic on PCI Error */ | |
4de78c68 | 556 | if (edac_pci_get_panic_on_pe()) { |
7c9281d7 DT |
557 | /* If the count is different 'after' from 'before' */ |
558 | if (before_count != atomic_read(&pci_parity_count)) | |
559 | panic("EDAC: PCI Parity Error"); | |
560 | } | |
561 | } | |
562 | ||
563 | void edac_pci_clear_parity_errors(void) | |
564 | { | |
565 | /* Clear any PCI bus parity errors that devices initially have logged | |
566 | * in their registers. | |
567 | */ | |
568 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear); | |
569 | } | |
91b99041 DJ |
570 | void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg) |
571 | { | |
572 | ||
573 | /* global PE counter incremented by edac_pci_do_parity_check() */ | |
574 | atomic_inc(&pci->counters.pe_count); | |
575 | ||
4de78c68 | 576 | if (edac_pci_get_log_pe()) |
91b99041 DJ |
577 | edac_pci_printk(pci, KERN_WARNING, |
578 | "Parity Error ctl: %s %d: %s\n", | |
579 | pci->ctl_name, pci->pci_idx, msg); | |
580 | ||
581 | /* | |
582 | * poke all PCI devices and see which one is the troublemaker | |
583 | * panic() is called if set | |
584 | */ | |
585 | edac_pci_do_parity_check(); | |
586 | } | |
079708b9 | 587 | |
91b99041 | 588 | EXPORT_SYMBOL_GPL(edac_pci_handle_pe); |
7c9281d7 | 589 | |
91b99041 DJ |
590 | void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg) |
591 | { | |
592 | ||
593 | /* global NPE counter incremented by edac_pci_do_parity_check() */ | |
594 | atomic_inc(&pci->counters.npe_count); | |
595 | ||
4de78c68 | 596 | if (edac_pci_get_log_npe()) |
91b99041 DJ |
597 | edac_pci_printk(pci, KERN_WARNING, |
598 | "Non-Parity Error ctl: %s %d: %s\n", | |
599 | pci->ctl_name, pci->pci_idx, msg); | |
600 | ||
601 | /* | |
602 | * poke all PCI devices and see which one is the troublemaker | |
603 | * panic() is called if set | |
604 | */ | |
605 | edac_pci_do_parity_check(); | |
606 | } | |
079708b9 | 607 | |
91b99041 | 608 | EXPORT_SYMBOL_GPL(edac_pci_handle_npe); |
7c9281d7 DT |
609 | |
610 | /* | |
611 | * Define the PCI parameter to the module | |
612 | */ | |
91b99041 | 613 | module_param(check_pci_errors, int, 0644); |
4de78c68 | 614 | MODULE_PARM_DESC(check_pci_errors, |
079708b9 | 615 | "Check for PCI bus parity errors: 0=off 1=on"); |
4de78c68 DJ |
616 | module_param(edac_pci_panic_on_pe, int, 0644); |
617 | MODULE_PARM_DESC(edac_pci_panic_on_pe, | |
079708b9 | 618 | "Panic on PCI Bus Parity error: 0=off 1=on"); |
7c9281d7 | 619 | |
079708b9 | 620 | #endif /* CONFIG_PCI */ |