blob: fac94cae2c3d5cb126707c3435a5822c9e3cec03 [file] [log] [blame]
Douglas Thompson20bcb7a2007-07-19 01:49:47 -07001/*
Douglas Thompson7c9281d2007-07-19 01:49:33 -07002 * (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
Douglas Thompson20bcb7a2007-07-19 01:49:47 -070013#include "edac_core.h"
Douglas Thompson7c9281d2007-07-19 01:49:33 -070014#include "edac_module.h"
15
Douglas Thompson7c9281d2007-07-19 01:49:33 -070016#ifdef CONFIG_PCI
Dave Jiang91b99042007-07-19 01:49:52 -070017
18#define EDAC_PCI_SYMLINK "device"
19
Douglas Thompsonf0440912007-07-19 01:50:19 -070020static int check_pci_errors; /* default YES check PCI parity */
21static int edac_pci_panic_on_pe; /* default no panic on PCI Parity */
Dave Jiang4de78c62007-07-19 01:49:54 -070022static int edac_pci_log_pe = 1; /* log PCI parity errors */
23static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
Douglas Thompson7c9281d2007-07-19 01:49:33 -070024static atomic_t pci_parity_count = ATOMIC_INIT(0);
Dave Jiang91b99042007-07-19 01:49:52 -070025static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
Dave Jiang4de78c62007-07-19 01:49:54 -070026static int edac_pci_poll_msec = 1000;
Douglas Thompson7c9281d2007-07-19 01:49:33 -070027
Douglas Thompson079708b2007-07-19 01:49:58 -070028static struct kobject edac_pci_kobj; /* /sys/devices/system/edac/pci */
Douglas Thompson7c9281d2007-07-19 01:49:33 -070029static struct completion edac_pci_kobj_complete;
Dave Jiang91b99042007-07-19 01:49:52 -070030static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -070031
Dave Jiang4de78c62007-07-19 01:49:54 -070032int edac_pci_get_check_errors(void)
33{
34 return check_pci_errors;
35}
36
37int edac_pci_get_log_pe(void)
38{
39 return edac_pci_log_pe;
40}
41
42int edac_pci_get_log_npe(void)
43{
44 return edac_pci_log_npe;
45}
46
47int edac_pci_get_panic_on_pe(void)
48{
49 return edac_pci_panic_on_pe;
50}
51
52int edac_pci_get_poll_msec(void)
53{
54 return edac_pci_poll_msec;
55}
56
Dave Jiang91b99042007-07-19 01:49:52 -070057/**************************** EDAC PCI sysfs instance *******************/
58static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
59{
Douglas Thompson079708b2007-07-19 01:49:58 -070060 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070061}
62
63static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
Douglas Thompson052dfb42007-07-19 01:50:13 -070064 char *data)
Dave Jiang91b99042007-07-19 01:49:52 -070065{
Douglas Thompson079708b2007-07-19 01:49:58 -070066 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070067}
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 */
73static 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 */
84struct instance_attribute {
Douglas Thompson079708b2007-07-19 01:49:58 -070085 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);
Dave Jiang91b99042007-07-19 01:49:52 -070088};
89
90/* Function to 'show' fields from the edac_pci 'instance' structure */
91static ssize_t edac_pci_instance_show(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -070092 struct attribute *attr, char *buffer)
Dave Jiang91b99042007-07-19 01:49:52 -070093{
Douglas Thompson079708b2007-07-19 01:49:58 -070094 struct edac_pci_ctl_info *pci = to_instance(kobj);
95 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -070096
Douglas Thompson079708b2007-07-19 01:49:58 -070097 if (instance_attr->show)
98 return instance_attr->show(pci, buffer);
99 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700100}
101
Dave Jiang91b99042007-07-19 01:49:52 -0700102/* Function to 'store' fields into the edac_pci 'instance' structure */
103static ssize_t edac_pci_instance_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700104 struct attribute *attr,
105 const char *buffer, size_t count)
Dave Jiang91b99042007-07-19 01:49:52 -0700106{
Douglas Thompson079708b2007-07-19 01:49:58 -0700107 struct edac_pci_ctl_info *pci = to_instance(kobj);
108 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700109
Douglas Thompson079708b2007-07-19 01:49:58 -0700110 if (instance_attr->store)
111 return instance_attr->store(pci, buffer, count);
112 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700113}
114
115static 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) \
121static struct instance_attribute attr_instance_##_name = { \
122 .attr = {.name = __stringify(_name), .mode = _mode }, \
123 .show = _show, \
124 .store = _store, \
125};
126
127INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
128INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
129
130/* pci instance attributes */
131static struct instance_attribute *pci_instance_attr[] = {
132 &attr_instance_pe_count,
133 &attr_instance_npe_count,
134 NULL
135};
136
137/* the ktype for pci instance */
138static 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
144static 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",
Douglas Thompson079708b2007-07-19 01:49:58 -0700158 __func__, idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700159 return err;
160 }
161
162 debugf1("%s() Register instance 'pci%d' kobject\n", __func__, idx);
163
164 return 0;
165}
166
167static void
168edac_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)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700178
179static ssize_t edac_pci_int_show(void *ptr, char *buffer)
180{
181 int *value = ptr;
Douglas Thompson079708b2007-07-19 01:49:58 -0700182 return sprintf(buffer, "%d\n", *value);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700183}
184
185static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
186{
187 int *value = ptr;
188
189 if (isdigit(*buffer))
Douglas Thompson079708b2007-07-19 01:49:58 -0700190 *value = simple_strtoul(buffer, NULL, 0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700191
192 return count;
193}
194
195struct edac_pci_dev_attribute {
196 struct attribute attr;
197 void *value;
Douglas Thompson079708b2007-07-19 01:49:58 -0700198 ssize_t(*show) (void *, char *);
199 ssize_t(*store) (void *, const char *, size_t);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700200};
201
202/* Set of show/store abstract level functions for PCI Parity object */
203static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
Douglas Thompson079708b2007-07-19 01:49:58 -0700204 char *buffer)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700205{
206 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700207 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700208
209 if (edac_pci_dev->show)
210 return edac_pci_dev->show(edac_pci_dev->value, buffer);
211 return -EIO;
212}
213
214static ssize_t edac_pci_dev_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700215 struct attribute *attr, const char *buffer,
216 size_t count)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700217{
218 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700219 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700220
221 if (edac_pci_dev->show)
222 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
223 return -EIO;
224}
225
226static struct sysfs_ops edac_pci_sysfs_ops = {
Douglas Thompson079708b2007-07-19 01:49:58 -0700227 .show = edac_pci_dev_show,
228 .store = edac_pci_dev_store
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700229};
230
231#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
232static 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) \
240static 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 */
Douglas Thompson079708b2007-07-19 01:49:58 -0700248EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700249 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700250EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700251 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700252EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700253 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700254EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700255 edac_pci_int_store);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700256EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
Dave Jiang91b99042007-07-19 01:49:52 -0700257EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700258
259/* Base Attributes of the memory ECC object */
260static struct edac_pci_dev_attribute *edac_pci_attr[] = {
Dave Jiang91b99042007-07-19 01:49:52 -0700261 &edac_pci_attr_check_pci_errors,
Dave Jiang4de78c62007-07-19 01:49:54 -0700262 &edac_pci_attr_edac_pci_log_pe,
263 &edac_pci_attr_edac_pci_log_npe,
264 &edac_pci_attr_edac_pci_panic_on_pe,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700265 &edac_pci_attr_pci_parity_count,
Dave Jiang91b99042007-07-19 01:49:52 -0700266 &edac_pci_attr_pci_nonparity_count,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700267 NULL,
268};
269
270/* No memory to release */
271static void edac_pci_release(struct kobject *kobj)
272{
Dave Jiang91b99042007-07-19 01:49:52 -0700273 struct edac_pci_ctl_info *pci;
274
275 pci = to_edacpci(kobj);
276
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700277 debugf1("%s()\n", __func__);
Dave Jiang91b99042007-07-19 01:49:52 -0700278 complete(&pci->kobj_complete);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700279}
280
281static struct kobj_type ktype_edac_pci = {
282 .release = edac_pci_release,
283 .sysfs_ops = &edac_pci_sysfs_ops,
Douglas Thompson079708b2007-07-19 01:49:58 -0700284 .default_attrs = (struct attribute **)edac_pci_attr,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700285};
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 */
Dave Jiang91b99042007-07-19 01:49:52 -0700293int edac_pci_register_main_kobj(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700294{
295 int err;
296 struct sysdev_class *edac_class;
297
298 debugf1("%s()\n", __func__);
299
300 edac_class = edac_get_edac_class();
Dave Jiang91b99042007-07-19 01:49:52 -0700301 if (edac_class == NULL) {
302 debugf1("%s() no edac_class\n", __func__);
303 return -ENODEV;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700304 }
305
Dave Jiang91b99042007-07-19 01:49:52 -0700306 edac_pci_kobj.ktype = &ktype_edac_pci;
307
308 edac_pci_kobj.parent = &edac_class->kset.kobj;
309
310 err = kobject_set_name(&edac_pci_kobj, "pci");
Douglas Thompson079708b2007-07-19 01:49:58 -0700311 if (err)
Dave Jiang91b99042007-07-19 01:49:52 -0700312 return err;
313
314 /* Instanstiate the pci object */
315 /* FIXME: maybe new sysdev_create_subdir() */
316 err = kobject_register(&edac_pci_kobj);
317
318 if (err) {
319 debugf1("Failed to register '.../edac/pci'\n");
320 return err;
321 }
322
323 debugf1("Registered '.../edac/pci' kobject\n");
324
325 return 0;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700326}
327
328/*
Dave Jiang91b99042007-07-19 01:49:52 -0700329 * edac_pci_unregister_main_kobj()
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700330 *
331 * perform the sysfs teardown for the PCI attributes
332 */
Dave Jiang91b99042007-07-19 01:49:52 -0700333void edac_pci_unregister_main_kobj(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700334{
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
Dave Jiang91b99042007-07-19 01:49:52 -0700341int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
342{
343 int err;
344 struct kobject *edac_kobj = &pci->kobj;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700345
Dave Jiang91b99042007-07-19 01:49:52 -0700346 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 }
359
Dave Jiang91b99042007-07-19 01:49:52 -0700360 debugf0("%s() idx=%d\n", __func__, pci->pci_idx);
361
Douglas Thompson079708b2007-07-19 01:49:58 -0700362 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
Dave Jiang91b99042007-07-19 01:49:52 -0700363 if (err) {
364 debugf0("%s() sysfs_create_link() returned err= %d\n",
Douglas Thompson079708b2007-07-19 01:49:58 -0700365 __func__, err);
Dave Jiang91b99042007-07-19 01:49:52 -0700366 return err;
367 }
368
369 return 0;
370}
371
372void 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 *************************/
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700385static 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 |
Douglas Thompson052dfb42007-07-19 01:50:13 -0700408 PCI_STATUS_PARITY;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700409
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
Douglas Thompson079708b2007-07-19 01:49:58 -0700417typedef void (*pci_parity_check_fn_t) (struct pci_dev * dev);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700418
419/* Clear any PCI parity errors logged by this device. */
420static 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 */
437static void edac_pci_dev_parity_test(struct pci_dev *dev)
438{
439 u16 status;
Douglas Thompson079708b2007-07-19 01:49:58 -0700440 u8 header_type;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700441
442 /* read the STATUS register on this device
443 */
444 status = get_pci_parity_status(dev, 0);
445
Douglas Thompson079708b2007-07-19 01:49:58 -0700446 debugf2("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700447
448 /* check the status reg for errors */
449 if (status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700450 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700451 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700452 "Signaled System Error on %s\n",
453 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700454 atomic_inc(&pci_nonparity_count);
455 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700456
457 if (status & (PCI_STATUS_PARITY)) {
458 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700459 "Master Data Parity Error on %s\n",
460 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700461
462 atomic_inc(&pci_parity_count);
463 }
464
465 if (status & (PCI_STATUS_DETECTED_PARITY)) {
466 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700467 "Detected Parity Error on %s\n",
468 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700469
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
Douglas Thompson079708b2007-07-19 01:49:58 -0700477 debugf2("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700478
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
Douglas Thompson079708b2007-07-19 01:49:58 -0700483 debugf2("PCI SEC_STATUS= 0x%04x %s\n", status, dev->dev.bus_id);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700484
485 /* check the secondary status reg for errors */
486 if (status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700487 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700488 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700489 "Signaled System Error on %s\n",
490 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700491 atomic_inc(&pci_nonparity_count);
492 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700493
494 if (status & (PCI_STATUS_PARITY)) {
495 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700496 "Master Data Parity Error on "
497 "%s\n", pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700498
499 atomic_inc(&pci_parity_count);
500 }
501
502 if (status & (PCI_STATUS_DETECTED_PARITY)) {
503 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700504 "Detected Parity Error on %s\n",
505 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700506
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 */
518static 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 */
Douglas Thompson079708b2007-07-19 01:49:58 -0700526 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700527 fn(dev);
528 }
529}
530
531/*
532 * edac_pci_do_parity_check
533 *
534 * performs the actual PCI parity check operation
535 */
536void edac_pci_do_parity_check(void)
537{
538 unsigned long flags;
539 int before_count;
540
541 debugf3("%s()\n", __func__);
542
Dave Jiang91b99042007-07-19 01:49:52 -0700543 if (!check_pci_errors)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700544 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 */
Dave Jiang4de78c62007-07-19 01:49:54 -0700556 if (edac_pci_get_panic_on_pe()) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700557 /* 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
563void 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}
Dave Jiang91b99042007-07-19 01:49:52 -0700570void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
571{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700572
Dave Jiang91b99042007-07-19 01:49:52 -0700573 /* global PE counter incremented by edac_pci_do_parity_check() */
574 atomic_inc(&pci->counters.pe_count);
575
Dave Jiang4de78c62007-07-19 01:49:54 -0700576 if (edac_pci_get_log_pe())
Dave Jiang91b99042007-07-19 01:49:52 -0700577 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}
Douglas Thompson079708b2007-07-19 01:49:58 -0700587
Dave Jiang91b99042007-07-19 01:49:52 -0700588EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
589
590void 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
Dave Jiang4de78c62007-07-19 01:49:54 -0700596 if (edac_pci_get_log_npe())
Dave Jiang91b99042007-07-19 01:49:52 -0700597 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}
Douglas Thompson079708b2007-07-19 01:49:58 -0700607
Dave Jiang91b99042007-07-19 01:49:52 -0700608EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700609
610/*
611 * Define the PCI parameter to the module
612 */
Dave Jiang91b99042007-07-19 01:49:52 -0700613module_param(check_pci_errors, int, 0644);
Dave Jiang4de78c62007-07-19 01:49:54 -0700614MODULE_PARM_DESC(check_pci_errors,
Douglas Thompson079708b2007-07-19 01:49:58 -0700615 "Check for PCI bus parity errors: 0=off 1=on");
Dave Jiang4de78c62007-07-19 01:49:54 -0700616module_param(edac_pci_panic_on_pe, int, 0644);
617MODULE_PARM_DESC(edac_pci_panic_on_pe,
Douglas Thompson079708b2007-07-19 01:49:58 -0700618 "Panic on PCI Bus Parity error: 0=off 1=on");
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700619
Douglas Thompson079708b2007-07-19 01:49:58 -0700620#endif /* CONFIG_PCI */