blob: 023b01cb5175c70a15804faba0c356ecacfb1809 [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>
Borislav Petkov30e1f7a2010-09-02 17:26:48 +020010#include <linux/edac.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090011#include <linux/slab.h>
Douglas Thompson7c9281d2007-07-19 01:49:33 -070012#include <linux/ctype.h>
13
Douglas Thompson20bcb7a2007-07-19 01:49:47 -070014#include "edac_core.h"
Douglas Thompson7c9281d2007-07-19 01:49:33 -070015#include "edac_module.h"
16
Doug Thompsond4c14652007-07-26 10:41:15 -070017/* Turn off this whole feature if PCI is not configured */
Douglas Thompson7c9281d2007-07-19 01:49:33 -070018#ifdef CONFIG_PCI
Dave Jiang91b99042007-07-19 01:49:52 -070019
20#define EDAC_PCI_SYMLINK "device"
21
Doug Thompsond4c14652007-07-26 10:41:15 -070022/* data variables exported via sysfs */
23static int check_pci_errors; /* default NO check PCI parity */
24static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
25static int edac_pci_log_pe = 1; /* log PCI parity errors */
Dave Jiang4de78c62007-07-19 01:49:54 -070026static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
Doug Thompsond4c14652007-07-26 10:41:15 -070027static int edac_pci_poll_msec = 1000; /* one second workq period */
28
Douglas Thompson7c9281d2007-07-19 01:49:33 -070029static atomic_t pci_parity_count = ATOMIC_INIT(0);
Dave Jiang91b99042007-07-19 01:49:52 -070030static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -070031
Arthur Jones14cc5712008-07-25 01:49:08 -070032static struct kobject *edac_pci_top_main_kobj;
Dave Jiang91b99042007-07-19 01:49:52 -070033static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -070034
Doug Thompsond4c14652007-07-26 10:41:15 -070035/* getter functions for the data variables */
Dave Jiang4de78c62007-07-19 01:49:54 -070036int edac_pci_get_check_errors(void)
37{
38 return check_pci_errors;
39}
40
Adrian Bunk1a450272008-04-29 01:03:18 -070041static int edac_pci_get_log_pe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070042{
43 return edac_pci_log_pe;
44}
45
Adrian Bunk1a450272008-04-29 01:03:18 -070046static int edac_pci_get_log_npe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070047{
48 return edac_pci_log_npe;
49}
50
Adrian Bunk1a450272008-04-29 01:03:18 -070051static int edac_pci_get_panic_on_pe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070052{
53 return edac_pci_panic_on_pe;
54}
55
56int edac_pci_get_poll_msec(void)
57{
58 return edac_pci_poll_msec;
59}
60
Dave Jiang91b99042007-07-19 01:49:52 -070061/**************************** EDAC PCI sysfs instance *******************/
62static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
63{
Douglas Thompson079708b2007-07-19 01:49:58 -070064 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070065}
66
67static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
Douglas Thompson052dfb42007-07-19 01:50:13 -070068 char *data)
Dave Jiang91b99042007-07-19 01:49:52 -070069{
Douglas Thompson079708b2007-07-19 01:49:58 -070070 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070071}
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 */
77static void edac_pci_instance_release(struct kobject *kobj)
78{
79 struct edac_pci_ctl_info *pci;
80
Doug Thompsond4c14652007-07-26 10:41:15 -070081 debugf0("%s()\n", __func__);
Dave Jiang91b99042007-07-19 01:49:52 -070082
Doug Thompsond4c14652007-07-26 10:41:15 -070083 /* Form pointer to containing struct, the pci control struct */
Dave Jiang91b99042007-07-19 01:49:52 -070084 pci = to_instance(kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -070085
86 /* decrement reference count on top main kobj */
Arthur Jones14cc5712008-07-25 01:49:08 -070087 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -070088
89 kfree(pci); /* Free the control struct */
Dave Jiang91b99042007-07-19 01:49:52 -070090}
91
92/* instance specific attribute structure */
93struct instance_attribute {
Douglas Thompson079708b2007-07-19 01:49:58 -070094 struct attribute attr;
Doug Thompsond4c14652007-07-26 10:41:15 -070095 ssize_t(*show) (struct edac_pci_ctl_info *, char *);
96 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
Dave Jiang91b99042007-07-19 01:49:52 -070097};
98
99/* Function to 'show' fields from the edac_pci 'instance' structure */
100static ssize_t edac_pci_instance_show(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700101 struct attribute *attr, char *buffer)
Dave Jiang91b99042007-07-19 01:49:52 -0700102{
Douglas Thompson079708b2007-07-19 01:49:58 -0700103 struct edac_pci_ctl_info *pci = to_instance(kobj);
104 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700105
Douglas Thompson079708b2007-07-19 01:49:58 -0700106 if (instance_attr->show)
107 return instance_attr->show(pci, buffer);
108 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700109}
110
Dave Jiang91b99042007-07-19 01:49:52 -0700111/* Function to 'store' fields into the edac_pci 'instance' structure */
112static ssize_t edac_pci_instance_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700113 struct attribute *attr,
114 const char *buffer, size_t count)
Dave Jiang91b99042007-07-19 01:49:52 -0700115{
Douglas Thompson079708b2007-07-19 01:49:58 -0700116 struct edac_pci_ctl_info *pci = to_instance(kobj);
117 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700118
Douglas Thompson079708b2007-07-19 01:49:58 -0700119 if (instance_attr->store)
120 return instance_attr->store(pci, buffer, count);
121 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700122}
123
Doug Thompsond4c14652007-07-26 10:41:15 -0700124/* fs_ops table */
Emese Revfy52cf25d2010-01-19 02:58:23 +0100125static const struct sysfs_ops pci_instance_ops = {
Dave Jiang91b99042007-07-19 01:49:52 -0700126 .show = edac_pci_instance_show,
127 .store = edac_pci_instance_store
128};
129
130#define INSTANCE_ATTR(_name, _mode, _show, _store) \
131static struct instance_attribute attr_instance_##_name = { \
132 .attr = {.name = __stringify(_name), .mode = _mode }, \
133 .show = _show, \
134 .store = _store, \
135};
136
137INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
138INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
139
140/* pci instance attributes */
141static struct instance_attribute *pci_instance_attr[] = {
142 &attr_instance_pe_count,
143 &attr_instance_npe_count,
144 NULL
145};
146
Doug Thompsond4c14652007-07-26 10:41:15 -0700147/* the ktype for a pci instance */
Dave Jiang91b99042007-07-19 01:49:52 -0700148static 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
Doug Thompsond4c14652007-07-26 10:41:15 -0700154/*
155 * edac_pci_create_instance_kobj
156 *
157 * construct one EDAC PCI instance's kobject for use
158 */
Dave Jiang91b99042007-07-19 01:49:52 -0700159static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
160{
Doug Thompsond4c14652007-07-26 10:41:15 -0700161 struct kobject *main_kobj;
Dave Jiang91b99042007-07-19 01:49:52 -0700162 int err;
163
Doug Thompsond4c14652007-07-26 10:41:15 -0700164 debugf0("%s()\n", __func__);
165
Doug Thompsond4c14652007-07-26 10:41:15 -0700166 /* 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 */
Arthur Jones14cc5712008-07-25 01:49:08 -0700170 main_kobj = kobject_get(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700171 if (!main_kobj) {
172 err = -ENODEV;
173 goto error_out;
174 }
175
176 /* And now register this new kobject under the main kobj */
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400177 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
Arthur Jones14cc5712008-07-25 01:49:08 -0700178 edac_pci_top_main_kobj, "pci%d", idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700179 if (err != 0) {
180 debugf2("%s() failed to register instance pci%d\n",
Douglas Thompson079708b2007-07-19 01:49:58 -0700181 __func__, idx);
Arthur Jones14cc5712008-07-25 01:49:08 -0700182 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700183 goto error_out;
Dave Jiang91b99042007-07-19 01:49:52 -0700184 }
185
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400186 kobject_uevent(&pci->kobj, KOBJ_ADD);
Dave Jiang91b99042007-07-19 01:49:52 -0700187 debugf1("%s() Register instance 'pci%d' kobject\n", __func__, idx);
188
189 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700190
191 /* Error unwind statck */
192error_out:
193 return err;
Dave Jiang91b99042007-07-19 01:49:52 -0700194}
195
Doug Thompsond4c14652007-07-26 10:41:15 -0700196/*
197 * edac_pci_unregister_sysfs_instance_kobj
198 *
199 * unregister the kobj for the EDAC PCI instance
200 */
Adrian Bunk1a450272008-04-29 01:03:18 -0700201static void edac_pci_unregister_sysfs_instance_kobj(
202 struct edac_pci_ctl_info *pci)
Dave Jiang91b99042007-07-19 01:49:52 -0700203{
Doug Thompsond4c14652007-07-26 10:41:15 -0700204 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 */
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800210 kobject_put(&pci->kobj);
Dave Jiang91b99042007-07-19 01:49:52 -0700211}
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)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700216
Doug Thompsond4c14652007-07-26 10:41:15 -0700217/* simple show/store functions for attributes */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700218static ssize_t edac_pci_int_show(void *ptr, char *buffer)
219{
220 int *value = ptr;
Douglas Thompson079708b2007-07-19 01:49:58 -0700221 return sprintf(buffer, "%d\n", *value);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700222}
223
224static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
225{
226 int *value = ptr;
227
228 if (isdigit(*buffer))
Douglas Thompson079708b2007-07-19 01:49:58 -0700229 *value = simple_strtoul(buffer, NULL, 0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700230
231 return count;
232}
233
234struct edac_pci_dev_attribute {
235 struct attribute attr;
236 void *value;
Douglas Thompson079708b2007-07-19 01:49:58 -0700237 ssize_t(*show) (void *, char *);
238 ssize_t(*store) (void *, const char *, size_t);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700239};
240
241/* Set of show/store abstract level functions for PCI Parity object */
242static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
Douglas Thompson079708b2007-07-19 01:49:58 -0700243 char *buffer)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700244{
245 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700246 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700247
248 if (edac_pci_dev->show)
249 return edac_pci_dev->show(edac_pci_dev->value, buffer);
250 return -EIO;
251}
252
253static ssize_t edac_pci_dev_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700254 struct attribute *attr, const char *buffer,
255 size_t count)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700256{
257 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700258 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700259
260 if (edac_pci_dev->show)
261 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
262 return -EIO;
263}
264
Emese Revfy52cf25d2010-01-19 02:58:23 +0100265static const struct sysfs_ops edac_pci_sysfs_ops = {
Douglas Thompson079708b2007-07-19 01:49:58 -0700266 .show = edac_pci_dev_show,
267 .store = edac_pci_dev_store
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700268};
269
270#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
271static 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) \
279static 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 */
Douglas Thompson079708b2007-07-19 01:49:58 -0700287EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700288 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700289EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700290 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700291EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700292 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700293EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700294 edac_pci_int_store);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700295EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
Dave Jiang91b99042007-07-19 01:49:52 -0700296EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700297
298/* Base Attributes of the memory ECC object */
299static struct edac_pci_dev_attribute *edac_pci_attr[] = {
Dave Jiang91b99042007-07-19 01:49:52 -0700300 &edac_pci_attr_check_pci_errors,
Dave Jiang4de78c62007-07-19 01:49:54 -0700301 &edac_pci_attr_edac_pci_log_pe,
302 &edac_pci_attr_edac_pci_log_npe,
303 &edac_pci_attr_edac_pci_panic_on_pe,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700304 &edac_pci_attr_pci_parity_count,
Dave Jiang91b99042007-07-19 01:49:52 -0700305 &edac_pci_attr_pci_nonparity_count,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700306 NULL,
307};
308
Doug Thompsond4c14652007-07-26 10:41:15 -0700309/*
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 */
318static void edac_pci_release_main_kobj(struct kobject *kobj)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700319{
Doug Thompsond4c14652007-07-26 10:41:15 -0700320 debugf0("%s() here to module_put(THIS_MODULE)\n", __func__);
Dave Jiang91b99042007-07-19 01:49:52 -0700321
Arthur Jones14cc5712008-07-25 01:49:08 -0700322 kfree(kobj);
323
Doug Thompsond4c14652007-07-26 10:41:15 -0700324 /* 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);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700328}
329
Doug Thompsond4c14652007-07-26 10:41:15 -0700330/* ktype struct for the EDAC PCI main kobj */
331static struct kobj_type ktype_edac_pci_main_kobj = {
332 .release = edac_pci_release_main_kobj,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700333 .sysfs_ops = &edac_pci_sysfs_ops,
Douglas Thompson079708b2007-07-19 01:49:58 -0700334 .default_attrs = (struct attribute **)edac_pci_attr,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700335};
336
337/**
Doug Thompsond4c14652007-07-26 10:41:15 -0700338 * edac_pci_main_kobj_setup()
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700339 *
340 * setup the sysfs for EDAC PCI attributes
341 * assumes edac_class has already been initialized
342 */
Adrian Bunk1a450272008-04-29 01:03:18 -0700343static int edac_pci_main_kobj_setup(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700344{
345 int err;
346 struct sysdev_class *edac_class;
347
Doug Thompsond4c14652007-07-26 10:41:15 -0700348 debugf0("%s()\n", __func__);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700349
Doug Thompsond4c14652007-07-26 10:41:15 -0700350 /* 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 atributes
356 */
Borislav Petkov30e1f7a2010-09-02 17:26:48 +0200357 edac_class = edac_get_sysfs_class();
Dave Jiang91b99042007-07-19 01:49:52 -0700358 if (edac_class == NULL) {
359 debugf1("%s() no edac_class\n", __func__);
Doug Thompsond4c14652007-07-26 10:41:15 -0700360 err = -ENODEV;
361 goto decrement_count_fail;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700362 }
363
Doug Thompsond4c14652007-07-26 10:41:15 -0700364 /* 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;
Borislav Petkov30e1f7a2010-09-02 17:26:48 +0200371 goto mod_get_fail;
Doug Thompsond4c14652007-07-26 10:41:15 -0700372 }
Dave Jiang91b99042007-07-19 01:49:52 -0700373
Arthur Jones14cc5712008-07-25 01:49:08 -0700374 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
Dave Jiang91b99042007-07-19 01:49:52 -0700381 /* Instanstiate the pci object */
Arthur Jones14cc5712008-07-25 01:49:08 -0700382 err = kobject_init_and_add(edac_pci_top_main_kobj,
383 &ktype_edac_pci_main_kobj,
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400384 &edac_class->kset.kobj, "pci");
Dave Jiang91b99042007-07-19 01:49:52 -0700385 if (err) {
386 debugf1("Failed to register '.../edac/pci'\n");
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400387 goto kobject_init_and_add_fail;
Dave Jiang91b99042007-07-19 01:49:52 -0700388 }
389
Doug Thompsond4c14652007-07-26 10:41:15 -0700390 /* 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 */
Arthur Jones14cc5712008-07-25 01:49:08 -0700394 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
Dave Jiang91b99042007-07-19 01:49:52 -0700395 debugf1("Registered '.../edac/pci' kobject\n");
396
397 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700398
399 /* Error unwind statck */
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400400kobject_init_and_add_fail:
Arthur Jones14cc5712008-07-25 01:49:08 -0700401 kfree(edac_pci_top_main_kobj);
402
403kzalloc_fail:
Doug Thompsond4c14652007-07-26 10:41:15 -0700404 module_put(THIS_MODULE);
405
Borislav Petkov30e1f7a2010-09-02 17:26:48 +0200406mod_get_fail:
407 edac_put_sysfs_class();
408
Doug Thompsond4c14652007-07-26 10:41:15 -0700409decrement_count_fail:
410 /* if are on this error exit, nothing to tear down */
411 atomic_dec(&edac_pci_sysfs_refcount);
412
413 return err;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700414}
415
416/*
Doug Thompsond4c14652007-07-26 10:41:15 -0700417 * edac_pci_main_kobj_teardown()
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700418 *
Doug Thompsond4c14652007-07-26 10:41:15 -0700419 * if no longer linked (needed) remove the top level EDAC PCI
420 * kobject with its controls and attributes
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700421 */
Doug Thompsond4c14652007-07-26 10:41:15 -0700422static void edac_pci_main_kobj_teardown(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700423{
424 debugf0("%s()\n", __func__);
Doug Thompsond4c14652007-07-26 10:41:15 -0700425
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) {
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800431 debugf0("%s() called kobject_put on main kobj\n",
Doug Thompsond4c14652007-07-26 10:41:15 -0700432 __func__);
Arthur Jones14cc5712008-07-25 01:49:08 -0700433 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700434 }
Borislav Petkov30e1f7a2010-09-02 17:26:48 +0200435 edac_put_sysfs_class();
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700436}
437
Doug Thompsond4c14652007-07-26 10:41:15 -0700438/*
439 *
440 * edac_pci_create_sysfs
441 *
442 * Create the controls/attributes for the specified EDAC PCI device
443 */
Dave Jiang91b99042007-07-19 01:49:52 -0700444int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
445{
446 int err;
447 struct kobject *edac_kobj = &pci->kobj;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700448
Dave Jiang91b99042007-07-19 01:49:52 -0700449 debugf0("%s() idx=%d\n", __func__, pci->pci_idx);
450
Doug Thompsond4c14652007-07-26 10:41:15 -0700451 /* 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
Douglas Thompson079708b2007-07-19 01:49:58 -0700461 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
Dave Jiang91b99042007-07-19 01:49:52 -0700462 if (err) {
463 debugf0("%s() sysfs_create_link() returned err= %d\n",
Douglas Thompson079708b2007-07-19 01:49:58 -0700464 __func__, err);
Doug Thompsond4c14652007-07-26 10:41:15 -0700465 goto symlink_fail;
Dave Jiang91b99042007-07-19 01:49:52 -0700466 }
467
468 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700469
470 /* Error unwind stack */
471symlink_fail:
472 edac_pci_unregister_sysfs_instance_kobj(pci);
473
474unregister_cleanup:
475 edac_pci_main_kobj_teardown();
476
477 return err;
Dave Jiang91b99042007-07-19 01:49:52 -0700478}
479
Doug Thompsond4c14652007-07-26 10:41:15 -0700480/*
481 * edac_pci_remove_sysfs
482 *
483 * remove the controls and attributes for this EDAC PCI device
484 */
Dave Jiang91b99042007-07-19 01:49:52 -0700485void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
486{
Doug Thompsond4c14652007-07-26 10:41:15 -0700487 debugf0("%s() index=%d\n", __func__, pci->pci_idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700488
Doug Thompsond4c14652007-07-26 10:41:15 -0700489 /* Remove the symlink */
Dave Jiang91b99042007-07-19 01:49:52 -0700490 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
491
Doug Thompsond4c14652007-07-26 10:41:15 -0700492 /* 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();
Dave Jiang91b99042007-07-19 01:49:52 -0700501}
502
503/************************ PCI error handling *************************/
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700504static 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 |
Douglas Thompson052dfb42007-07-19 01:50:13 -0700527 PCI_STATUS_PARITY;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700528
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
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700536
537/* Clear any PCI parity errors logged by this device. */
538static 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 *
Doug Thompsond4c14652007-07-26 10:41:15 -0700554 * Fucntion to retrieve the current parity status
555 * and decode it
556 *
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700557 */
558static void edac_pci_dev_parity_test(struct pci_dev *dev)
559{
Doug Thompsond4c14652007-07-26 10:41:15 -0700560 unsigned long flags;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700561 u16 status;
Douglas Thompson079708b2007-07-19 01:49:58 -0700562 u8 header_type;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700563
Doug Thompsond4c14652007-07-26 10:41:15 -0700564 /* stop any interrupts until we can acquire the status */
565 local_irq_save(flags);
566
567 /* read the STATUS register on this device */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700568 status = get_pci_parity_status(dev, 0);
569
Doug Thompsond4c14652007-07-26 10:41:15 -0700570 /* 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
Kay Sievers281efb12009-01-06 14:42:57 -0800575 debugf4("PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700576
Bryan Boatright6b09ff92008-02-07 00:14:58 -0800577 /* 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) {
Dave Jiang91b99042007-07-19 01:49:52 -0700581 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700582 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700583 "Signaled System Error on %s\n",
584 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700585 atomic_inc(&pci_nonparity_count);
586 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700587
588 if (status & (PCI_STATUS_PARITY)) {
589 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700590 "Master Data Parity Error on %s\n",
591 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700592
593 atomic_inc(&pci_parity_count);
594 }
595
596 if (status & (PCI_STATUS_DETECTED_PARITY)) {
597 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700598 "Detected Parity Error on %s\n",
599 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700600
601 atomic_inc(&pci_parity_count);
602 }
603 }
604
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700605
Kay Sievers281efb12009-01-06 14:42:57 -0800606 debugf4("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700607
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
Kay Sievers281efb12009-01-06 14:42:57 -0800612 debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700613
Bryan Boatright6b09ff92008-02-07 00:14:58 -0800614 /* check the secondary status reg for errors,
615 * on NOT broken boards
616 */
617 if (status && !dev->broken_parity_status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700618 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700619 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700620 "Signaled System Error on %s\n",
621 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700622 atomic_inc(&pci_nonparity_count);
623 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700624
625 if (status & (PCI_STATUS_PARITY)) {
626 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700627 "Master Data Parity Error on "
628 "%s\n", pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700629
630 atomic_inc(&pci_parity_count);
631 }
632
633 if (status & (PCI_STATUS_DETECTED_PARITY)) {
634 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700635 "Detected Parity Error on %s\n",
636 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700637
638 atomic_inc(&pci_parity_count);
639 }
640 }
641 }
642}
643
Doug Thompsond4c14652007-07-26 10:41:15 -0700644/* reduce some complexity in definition of the iterator */
645typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
646
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700647/*
648 * pci_dev parity list iterator
Doug Thompsond4c14652007-07-26 10:41:15 -0700649 * Scan the PCI device list for one pass, looking for SERRORs
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700650 * Master Parity ERRORS or Parity ERRORs on primary or secondary devices
651 */
652static 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 */
Douglas Thompson079708b2007-07-19 01:49:58 -0700660 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700661 fn(dev);
662 }
663}
664
665/*
666 * edac_pci_do_parity_check
667 *
668 * performs the actual PCI parity check operation
669 */
670void edac_pci_do_parity_check(void)
671{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700672 int before_count;
673
674 debugf3("%s()\n", __func__);
675
Doug Thompsond4c14652007-07-26 10:41:15 -0700676 /* if policy has PCI check off, leave now */
Dave Jiang91b99042007-07-19 01:49:52 -0700677 if (!check_pci_errors)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700678 return;
679
680 before_count = atomic_read(&pci_parity_count);
681
682 /* scan all PCI devices looking for a Parity Error on devices and
Doug Thompsond4c14652007-07-26 10:41:15 -0700683 * bridges.
684 * The iterator calls pci_get_device() which might sleep, thus
685 * we cannot disable interrupts in this scan.
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700686 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700687 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700688
689 /* Only if operator has selected panic on PCI Error */
Dave Jiang4de78c62007-07-19 01:49:54 -0700690 if (edac_pci_get_panic_on_pe()) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700691 /* 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
Doug Thompsond4c14652007-07-26 10:41:15 -0700697/*
698 * edac_pci_clear_parity_errors
699 *
700 * function to perform an iteration over the PCI devices
701 * and clearn their current status
702 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700703void 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}
Doug Thompsond4c14652007-07-26 10:41:15 -0700710
711/*
712 * edac_pci_handle_pe
713 *
714 * Called to handle a PARITY ERROR event
715 */
Dave Jiang91b99042007-07-19 01:49:52 -0700716void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
717{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700718
Dave Jiang91b99042007-07-19 01:49:52 -0700719 /* global PE counter incremented by edac_pci_do_parity_check() */
720 atomic_inc(&pci->counters.pe_count);
721
Dave Jiang4de78c62007-07-19 01:49:54 -0700722 if (edac_pci_get_log_pe())
Dave Jiang91b99042007-07-19 01:49:52 -0700723 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}
733EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
734
Doug Thompsond4c14652007-07-26 10:41:15 -0700735
736/*
737 * edac_pci_handle_npe
738 *
739 * Called to handle a NON-PARITY ERROR event
740 */
Dave Jiang91b99042007-07-19 01:49:52 -0700741void 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
Dave Jiang4de78c62007-07-19 01:49:54 -0700747 if (edac_pci_get_log_npe())
Dave Jiang91b99042007-07-19 01:49:52 -0700748 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}
758EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700759
760/*
761 * Define the PCI parameter to the module
762 */
Dave Jiang91b99042007-07-19 01:49:52 -0700763module_param(check_pci_errors, int, 0644);
Dave Jiang4de78c62007-07-19 01:49:54 -0700764MODULE_PARM_DESC(check_pci_errors,
Douglas Thompson079708b2007-07-19 01:49:58 -0700765 "Check for PCI bus parity errors: 0=off 1=on");
Dave Jiang4de78c62007-07-19 01:49:54 -0700766module_param(edac_pci_panic_on_pe, int, 0644);
767MODULE_PARM_DESC(edac_pci_panic_on_pe,
Douglas Thompson079708b2007-07-19 01:49:58 -0700768 "Panic on PCI Bus Parity error: 0=off 1=on");
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700769
Douglas Thompson079708b2007-07-19 01:49:58 -0700770#endif /* CONFIG_PCI */