blob: 6e3428ba400f38774f7ac562b51b3759b81913d2 [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
Dave Jiang91b99042007-07-19 01:49:52 -070017#define EDAC_PCI_SYMLINK "device"
18
Doug Thompsond4c14652007-07-26 10:41:15 -070019/* data variables exported via sysfs */
20static int check_pci_errors; /* default NO check PCI parity */
21static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
22static int edac_pci_log_pe = 1; /* log PCI parity errors */
Dave Jiang4de78c62007-07-19 01:49:54 -070023static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
Doug Thompsond4c14652007-07-26 10:41:15 -070024static int edac_pci_poll_msec = 1000; /* one second workq period */
25
Douglas Thompson7c9281d2007-07-19 01:49:33 -070026static atomic_t pci_parity_count = ATOMIC_INIT(0);
Dave Jiang91b99042007-07-19 01:49:52 -070027static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -070028
Arthur Jones14cc5712008-07-25 01:49:08 -070029static struct kobject *edac_pci_top_main_kobj;
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
Doug Thompsond4c14652007-07-26 10:41:15 -070032/* getter functions for the data variables */
Dave Jiang4de78c62007-07-19 01:49:54 -070033int edac_pci_get_check_errors(void)
34{
35 return check_pci_errors;
36}
37
Adrian Bunk1a450272008-04-29 01:03:18 -070038static int edac_pci_get_log_pe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070039{
40 return edac_pci_log_pe;
41}
42
Adrian Bunk1a450272008-04-29 01:03:18 -070043static int edac_pci_get_log_npe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070044{
45 return edac_pci_log_npe;
46}
47
Adrian Bunk1a450272008-04-29 01:03:18 -070048static int edac_pci_get_panic_on_pe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070049{
50 return edac_pci_panic_on_pe;
51}
52
53int edac_pci_get_poll_msec(void)
54{
55 return edac_pci_poll_msec;
56}
57
Dave Jiang91b99042007-07-19 01:49:52 -070058/**************************** EDAC PCI sysfs instance *******************/
59static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
60{
Douglas Thompson079708b2007-07-19 01:49:58 -070061 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070062}
63
64static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
Douglas Thompson052dfb42007-07-19 01:50:13 -070065 char *data)
Dave Jiang91b99042007-07-19 01:49:52 -070066{
Douglas Thompson079708b2007-07-19 01:49:58 -070067 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070068}
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 */
74static void edac_pci_instance_release(struct kobject *kobj)
75{
76 struct edac_pci_ctl_info *pci;
77
Joe Perches956b9ba2012-04-29 17:08:39 -030078 edac_dbg(0, "\n");
Dave Jiang91b99042007-07-19 01:49:52 -070079
Doug Thompsond4c14652007-07-26 10:41:15 -070080 /* Form pointer to containing struct, the pci control struct */
Dave Jiang91b99042007-07-19 01:49:52 -070081 pci = to_instance(kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -070082
83 /* decrement reference count on top main kobj */
Arthur Jones14cc5712008-07-25 01:49:08 -070084 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -070085
86 kfree(pci); /* Free the control struct */
Dave Jiang91b99042007-07-19 01:49:52 -070087}
88
89/* instance specific attribute structure */
90struct instance_attribute {
Douglas Thompson079708b2007-07-19 01:49:58 -070091 struct attribute attr;
Doug Thompsond4c14652007-07-26 10:41:15 -070092 ssize_t(*show) (struct edac_pci_ctl_info *, char *);
93 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
Dave Jiang91b99042007-07-19 01:49:52 -070094};
95
96/* Function to 'show' fields from the edac_pci 'instance' structure */
97static ssize_t edac_pci_instance_show(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -070098 struct attribute *attr, char *buffer)
Dave Jiang91b99042007-07-19 01:49:52 -070099{
Douglas Thompson079708b2007-07-19 01:49:58 -0700100 struct edac_pci_ctl_info *pci = to_instance(kobj);
101 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700102
Douglas Thompson079708b2007-07-19 01:49:58 -0700103 if (instance_attr->show)
104 return instance_attr->show(pci, buffer);
105 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700106}
107
Dave Jiang91b99042007-07-19 01:49:52 -0700108/* Function to 'store' fields into the edac_pci 'instance' structure */
109static ssize_t edac_pci_instance_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700110 struct attribute *attr,
111 const char *buffer, size_t count)
Dave Jiang91b99042007-07-19 01:49:52 -0700112{
Douglas Thompson079708b2007-07-19 01:49:58 -0700113 struct edac_pci_ctl_info *pci = to_instance(kobj);
114 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700115
Douglas Thompson079708b2007-07-19 01:49:58 -0700116 if (instance_attr->store)
117 return instance_attr->store(pci, buffer, count);
118 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700119}
120
Doug Thompsond4c14652007-07-26 10:41:15 -0700121/* fs_ops table */
Emese Revfy52cf25d2010-01-19 02:58:23 +0100122static const struct sysfs_ops pci_instance_ops = {
Dave Jiang91b99042007-07-19 01:49:52 -0700123 .show = edac_pci_instance_show,
124 .store = edac_pci_instance_store
125};
126
127#define INSTANCE_ATTR(_name, _mode, _show, _store) \
128static struct instance_attribute attr_instance_##_name = { \
129 .attr = {.name = __stringify(_name), .mode = _mode }, \
130 .show = _show, \
131 .store = _store, \
132};
133
134INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
135INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
136
137/* pci instance attributes */
138static struct instance_attribute *pci_instance_attr[] = {
139 &attr_instance_pe_count,
140 &attr_instance_npe_count,
141 NULL
142};
143
Doug Thompsond4c14652007-07-26 10:41:15 -0700144/* the ktype for a pci instance */
Dave Jiang91b99042007-07-19 01:49:52 -0700145static struct kobj_type ktype_pci_instance = {
146 .release = edac_pci_instance_release,
147 .sysfs_ops = &pci_instance_ops,
148 .default_attrs = (struct attribute **)pci_instance_attr,
149};
150
Doug Thompsond4c14652007-07-26 10:41:15 -0700151/*
152 * edac_pci_create_instance_kobj
153 *
154 * construct one EDAC PCI instance's kobject for use
155 */
Dave Jiang91b99042007-07-19 01:49:52 -0700156static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
157{
Doug Thompsond4c14652007-07-26 10:41:15 -0700158 struct kobject *main_kobj;
Dave Jiang91b99042007-07-19 01:49:52 -0700159 int err;
160
Joe Perches956b9ba2012-04-29 17:08:39 -0300161 edac_dbg(0, "\n");
Doug Thompsond4c14652007-07-26 10:41:15 -0700162
Doug Thompsond4c14652007-07-26 10:41:15 -0700163 /* First bump the ref count on the top main kobj, which will
164 * track the number of PCI instances we have, and thus nest
165 * properly on keeping the module loaded
166 */
Arthur Jones14cc5712008-07-25 01:49:08 -0700167 main_kobj = kobject_get(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700168 if (!main_kobj) {
169 err = -ENODEV;
170 goto error_out;
171 }
172
173 /* And now register this new kobject under the main kobj */
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400174 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
Arthur Jones14cc5712008-07-25 01:49:08 -0700175 edac_pci_top_main_kobj, "pci%d", idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700176 if (err != 0) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300177 edac_dbg(2, "failed to register instance pci%d\n", idx);
Arthur Jones14cc5712008-07-25 01:49:08 -0700178 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700179 goto error_out;
Dave Jiang91b99042007-07-19 01:49:52 -0700180 }
181
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400182 kobject_uevent(&pci->kobj, KOBJ_ADD);
Joe Perches956b9ba2012-04-29 17:08:39 -0300183 edac_dbg(1, "Register instance 'pci%d' kobject\n", idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700184
185 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700186
187 /* Error unwind statck */
188error_out:
189 return err;
Dave Jiang91b99042007-07-19 01:49:52 -0700190}
191
Doug Thompsond4c14652007-07-26 10:41:15 -0700192/*
193 * edac_pci_unregister_sysfs_instance_kobj
194 *
195 * unregister the kobj for the EDAC PCI instance
196 */
Adrian Bunk1a450272008-04-29 01:03:18 -0700197static void edac_pci_unregister_sysfs_instance_kobj(
198 struct edac_pci_ctl_info *pci)
Dave Jiang91b99042007-07-19 01:49:52 -0700199{
Joe Perches956b9ba2012-04-29 17:08:39 -0300200 edac_dbg(0, "\n");
Doug Thompsond4c14652007-07-26 10:41:15 -0700201
202 /* Unregister the instance kobject and allow its release
203 * function release the main reference count and then
204 * kfree the memory
205 */
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800206 kobject_put(&pci->kobj);
Dave Jiang91b99042007-07-19 01:49:52 -0700207}
208
209/***************************** EDAC PCI sysfs root **********************/
210#define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj)
211#define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700212
Doug Thompsond4c14652007-07-26 10:41:15 -0700213/* simple show/store functions for attributes */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700214static ssize_t edac_pci_int_show(void *ptr, char *buffer)
215{
216 int *value = ptr;
Douglas Thompson079708b2007-07-19 01:49:58 -0700217 return sprintf(buffer, "%d\n", *value);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700218}
219
220static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
221{
222 int *value = ptr;
223
224 if (isdigit(*buffer))
Douglas Thompson079708b2007-07-19 01:49:58 -0700225 *value = simple_strtoul(buffer, NULL, 0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700226
227 return count;
228}
229
230struct edac_pci_dev_attribute {
231 struct attribute attr;
232 void *value;
Douglas Thompson079708b2007-07-19 01:49:58 -0700233 ssize_t(*show) (void *, char *);
234 ssize_t(*store) (void *, const char *, size_t);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700235};
236
237/* Set of show/store abstract level functions for PCI Parity object */
238static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
Douglas Thompson079708b2007-07-19 01:49:58 -0700239 char *buffer)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700240{
241 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700242 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700243
244 if (edac_pci_dev->show)
245 return edac_pci_dev->show(edac_pci_dev->value, buffer);
246 return -EIO;
247}
248
249static ssize_t edac_pci_dev_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700250 struct attribute *attr, const char *buffer,
251 size_t count)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700252{
253 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700254 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700255
Dan Carpenter8024c4c2013-01-26 10:49:24 +0300256 if (edac_pci_dev->store)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700257 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
258 return -EIO;
259}
260
Emese Revfy52cf25d2010-01-19 02:58:23 +0100261static const struct sysfs_ops edac_pci_sysfs_ops = {
Douglas Thompson079708b2007-07-19 01:49:58 -0700262 .show = edac_pci_dev_show,
263 .store = edac_pci_dev_store
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700264};
265
266#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
267static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
268 .attr = {.name = __stringify(_name), .mode = _mode }, \
269 .value = &_name, \
270 .show = _show, \
271 .store = _store, \
272};
273
274#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \
275static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
276 .attr = {.name = __stringify(_name), .mode = _mode }, \
277 .value = _data, \
278 .show = _show, \
279 .store = _store, \
280};
281
282/* PCI Parity control files */
Douglas Thompson079708b2007-07-19 01:49:58 -0700283EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700284 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700285EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700286 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700287EDAC_PCI_ATTR(edac_pci_log_npe, 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_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700290 edac_pci_int_store);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700291EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
Dave Jiang91b99042007-07-19 01:49:52 -0700292EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700293
294/* Base Attributes of the memory ECC object */
295static struct edac_pci_dev_attribute *edac_pci_attr[] = {
Dave Jiang91b99042007-07-19 01:49:52 -0700296 &edac_pci_attr_check_pci_errors,
Dave Jiang4de78c62007-07-19 01:49:54 -0700297 &edac_pci_attr_edac_pci_log_pe,
298 &edac_pci_attr_edac_pci_log_npe,
299 &edac_pci_attr_edac_pci_panic_on_pe,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700300 &edac_pci_attr_pci_parity_count,
Dave Jiang91b99042007-07-19 01:49:52 -0700301 &edac_pci_attr_pci_nonparity_count,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700302 NULL,
303};
304
Doug Thompsond4c14652007-07-26 10:41:15 -0700305/*
306 * edac_pci_release_main_kobj
307 *
308 * This release function is called when the reference count to the
309 * passed kobj goes to zero.
310 *
311 * This kobj is the 'main' kobject that EDAC PCI instances
312 * link to, and thus provide for proper nesting counts
313 */
314static void edac_pci_release_main_kobj(struct kobject *kobj)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700315{
Joe Perches956b9ba2012-04-29 17:08:39 -0300316 edac_dbg(0, "here to module_put(THIS_MODULE)\n");
Dave Jiang91b99042007-07-19 01:49:52 -0700317
Arthur Jones14cc5712008-07-25 01:49:08 -0700318 kfree(kobj);
319
Doug Thompsond4c14652007-07-26 10:41:15 -0700320 /* last reference to top EDAC PCI kobject has been removed,
321 * NOW release our ref count on the core module
322 */
323 module_put(THIS_MODULE);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700324}
325
Doug Thompsond4c14652007-07-26 10:41:15 -0700326/* ktype struct for the EDAC PCI main kobj */
327static struct kobj_type ktype_edac_pci_main_kobj = {
328 .release = edac_pci_release_main_kobj,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700329 .sysfs_ops = &edac_pci_sysfs_ops,
Douglas Thompson079708b2007-07-19 01:49:58 -0700330 .default_attrs = (struct attribute **)edac_pci_attr,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700331};
332
333/**
Borislav Petkovd4538002015-11-30 14:20:41 +0100334 * edac_pci_main_kobj_setup: Setup the sysfs for EDAC PCI attributes.
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700335 */
Adrian Bunk1a450272008-04-29 01:03:18 -0700336static int edac_pci_main_kobj_setup(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700337{
338 int err;
Kay Sieversfe5ff8b2011-12-14 15:21:07 -0800339 struct bus_type *edac_subsys;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700340
Joe Perches956b9ba2012-04-29 17:08:39 -0300341 edac_dbg(0, "\n");
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700342
Doug Thompsond4c14652007-07-26 10:41:15 -0700343 /* check and count if we have already created the main kobject */
344 if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
345 return 0;
346
347 /* First time, so create the main kobject and its
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300348 * controls and attributes
Doug Thompsond4c14652007-07-26 10:41:15 -0700349 */
Kay Sieversfe5ff8b2011-12-14 15:21:07 -0800350 edac_subsys = edac_get_sysfs_subsys();
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700351
Doug Thompsond4c14652007-07-26 10:41:15 -0700352 /* Bump the reference count on this module to ensure the
353 * modules isn't unloaded until we deconstruct the top
354 * level main kobj for EDAC PCI
355 */
356 if (!try_module_get(THIS_MODULE)) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300357 edac_dbg(1, "try_module_get() failed\n");
Doug Thompsond4c14652007-07-26 10:41:15 -0700358 err = -ENODEV;
Borislav Petkov733476c2015-11-27 11:40:43 +0100359 goto decrement_count_fail;
Doug Thompsond4c14652007-07-26 10:41:15 -0700360 }
Dave Jiang91b99042007-07-19 01:49:52 -0700361
Arthur Jones14cc5712008-07-25 01:49:08 -0700362 edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
363 if (!edac_pci_top_main_kobj) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300364 edac_dbg(1, "Failed to allocate\n");
Arthur Jones14cc5712008-07-25 01:49:08 -0700365 err = -ENOMEM;
366 goto kzalloc_fail;
367 }
368
Dave Jiang91b99042007-07-19 01:49:52 -0700369 /* Instanstiate the pci object */
Arthur Jones14cc5712008-07-25 01:49:08 -0700370 err = kobject_init_and_add(edac_pci_top_main_kobj,
371 &ktype_edac_pci_main_kobj,
Kay Sieversfe5ff8b2011-12-14 15:21:07 -0800372 &edac_subsys->dev_root->kobj, "pci");
Dave Jiang91b99042007-07-19 01:49:52 -0700373 if (err) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300374 edac_dbg(1, "Failed to register '.../edac/pci'\n");
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400375 goto kobject_init_and_add_fail;
Dave Jiang91b99042007-07-19 01:49:52 -0700376 }
377
Doug Thompsond4c14652007-07-26 10:41:15 -0700378 /* At this point, to 'release' the top level kobject
379 * for EDAC PCI, then edac_pci_main_kobj_teardown()
380 * must be used, for resources to be cleaned up properly
381 */
Arthur Jones14cc5712008-07-25 01:49:08 -0700382 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
Joe Perches956b9ba2012-04-29 17:08:39 -0300383 edac_dbg(1, "Registered '.../edac/pci' kobject\n");
Dave Jiang91b99042007-07-19 01:49:52 -0700384
385 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700386
387 /* Error unwind statck */
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400388kobject_init_and_add_fail:
Arthur Jones14cc5712008-07-25 01:49:08 -0700389 kfree(edac_pci_top_main_kobj);
390
391kzalloc_fail:
Doug Thompsond4c14652007-07-26 10:41:15 -0700392 module_put(THIS_MODULE);
393
394decrement_count_fail:
395 /* if are on this error exit, nothing to tear down */
396 atomic_dec(&edac_pci_sysfs_refcount);
397
398 return err;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700399}
400
401/*
Doug Thompsond4c14652007-07-26 10:41:15 -0700402 * edac_pci_main_kobj_teardown()
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700403 *
Doug Thompsond4c14652007-07-26 10:41:15 -0700404 * if no longer linked (needed) remove the top level EDAC PCI
405 * kobject with its controls and attributes
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700406 */
Doug Thompsond4c14652007-07-26 10:41:15 -0700407static void edac_pci_main_kobj_teardown(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700408{
Joe Perches956b9ba2012-04-29 17:08:39 -0300409 edac_dbg(0, "\n");
Doug Thompsond4c14652007-07-26 10:41:15 -0700410
411 /* Decrement the count and only if no more controller instances
412 * are connected perform the unregisteration of the top level
413 * main kobj
414 */
415 if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300416 edac_dbg(0, "called kobject_put on main kobj\n");
Arthur Jones14cc5712008-07-25 01:49:08 -0700417 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700418 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700419}
420
Doug Thompsond4c14652007-07-26 10:41:15 -0700421/*
422 *
423 * edac_pci_create_sysfs
424 *
425 * Create the controls/attributes for the specified EDAC PCI device
426 */
Dave Jiang91b99042007-07-19 01:49:52 -0700427int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
428{
429 int err;
430 struct kobject *edac_kobj = &pci->kobj;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700431
Joe Perches956b9ba2012-04-29 17:08:39 -0300432 edac_dbg(0, "idx=%d\n", pci->pci_idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700433
Doug Thompsond4c14652007-07-26 10:41:15 -0700434 /* 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, pci->pci_idx);
441 if (err)
442 goto unregister_cleanup;
443
Douglas Thompson079708b2007-07-19 01:49:58 -0700444 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
Dave Jiang91b99042007-07-19 01:49:52 -0700445 if (err) {
Joe Perches956b9ba2012-04-29 17:08:39 -0300446 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
Doug Thompsond4c14652007-07-26 10:41:15 -0700447 goto symlink_fail;
Dave Jiang91b99042007-07-19 01:49:52 -0700448 }
449
450 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700451
452 /* Error unwind stack */
453symlink_fail:
454 edac_pci_unregister_sysfs_instance_kobj(pci);
455
456unregister_cleanup:
457 edac_pci_main_kobj_teardown();
458
459 return err;
Dave Jiang91b99042007-07-19 01:49:52 -0700460}
461
Doug Thompsond4c14652007-07-26 10:41:15 -0700462/*
463 * edac_pci_remove_sysfs
464 *
465 * remove the controls and attributes for this EDAC PCI device
466 */
Dave Jiang91b99042007-07-19 01:49:52 -0700467void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
468{
Joe Perches956b9ba2012-04-29 17:08:39 -0300469 edac_dbg(0, "index=%d\n", pci->pci_idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700470
Doug Thompsond4c14652007-07-26 10:41:15 -0700471 /* Remove the symlink */
Dave Jiang91b99042007-07-19 01:49:52 -0700472 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
473
Doug Thompsond4c14652007-07-26 10:41:15 -0700474 /* remove this PCI instance's sysfs entries */
475 edac_pci_unregister_sysfs_instance_kobj(pci);
476
477 /* Call the main unregister function, which will determine
478 * if this 'pci' is the last instance.
479 * If it is, the main kobject will be unregistered as a result
480 */
Joe Perches956b9ba2012-04-29 17:08:39 -0300481 edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n");
Doug Thompsond4c14652007-07-26 10:41:15 -0700482 edac_pci_main_kobj_teardown();
Dave Jiang91b99042007-07-19 01:49:52 -0700483}
484
485/************************ PCI error handling *************************/
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700486static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
487{
488 int where;
489 u16 status;
490
491 where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
492 pci_read_config_word(dev, where, &status);
493
494 /* If we get back 0xFFFF then we must suspect that the card has been
495 * pulled but the Linux PCI layer has not yet finished cleaning up.
496 * We don't want to report on such devices
497 */
498
499 if (status == 0xFFFF) {
500 u32 sanity;
501
502 pci_read_config_dword(dev, 0, &sanity);
503
504 if (sanity == 0xFFFFFFFF)
505 return 0;
506 }
507
508 status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
Douglas Thompson052dfb42007-07-19 01:50:13 -0700509 PCI_STATUS_PARITY;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700510
511 if (status)
512 /* reset only the bits we are interested in */
513 pci_write_config_word(dev, where, status);
514
515 return status;
516}
517
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700518
519/* Clear any PCI parity errors logged by this device. */
520static void edac_pci_dev_parity_clear(struct pci_dev *dev)
521{
522 u8 header_type;
523
524 get_pci_parity_status(dev, 0);
525
526 /* read the device TYPE, looking for bridges */
527 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
528
529 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
530 get_pci_parity_status(dev, 1);
531}
532
533/*
534 * PCI Parity polling
535 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300536 * Function to retrieve the current parity status
Doug Thompsond4c14652007-07-26 10:41:15 -0700537 * and decode it
538 *
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700539 */
540static void edac_pci_dev_parity_test(struct pci_dev *dev)
541{
Doug Thompsond4c14652007-07-26 10:41:15 -0700542 unsigned long flags;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700543 u16 status;
Douglas Thompson079708b2007-07-19 01:49:58 -0700544 u8 header_type;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700545
Doug Thompsond4c14652007-07-26 10:41:15 -0700546 /* stop any interrupts until we can acquire the status */
547 local_irq_save(flags);
548
549 /* read the STATUS register on this device */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700550 status = get_pci_parity_status(dev, 0);
551
Doug Thompsond4c14652007-07-26 10:41:15 -0700552 /* read the device TYPE, looking for bridges */
553 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
554
555 local_irq_restore(flags);
556
Joe Perches956b9ba2012-04-29 17:08:39 -0300557 edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700558
Bryan Boatright6b09ff92008-02-07 00:14:58 -0800559 /* check the status reg for errors on boards NOT marked as broken
560 * if broken, we cannot trust any of the status bits
561 */
562 if (status && !dev->broken_parity_status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700563 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700564 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700565 "Signaled System Error on %s\n",
566 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700567 atomic_inc(&pci_nonparity_count);
568 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700569
570 if (status & (PCI_STATUS_PARITY)) {
571 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700572 "Master Data Parity Error on %s\n",
573 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700574
575 atomic_inc(&pci_parity_count);
576 }
577
578 if (status & (PCI_STATUS_DETECTED_PARITY)) {
579 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700580 "Detected Parity Error on %s\n",
581 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700582
583 atomic_inc(&pci_parity_count);
584 }
585 }
586
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700587
Joe Perches956b9ba2012-04-29 17:08:39 -0300588 edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n",
589 header_type, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700590
591 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
592 /* On bridges, need to examine secondary status register */
593 status = get_pci_parity_status(dev, 1);
594
Joe Perches956b9ba2012-04-29 17:08:39 -0300595 edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n",
596 status, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700597
Bryan Boatright6b09ff92008-02-07 00:14:58 -0800598 /* check the secondary status reg for errors,
599 * on NOT broken boards
600 */
601 if (status && !dev->broken_parity_status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700602 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700603 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700604 "Signaled System Error on %s\n",
605 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700606 atomic_inc(&pci_nonparity_count);
607 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700608
609 if (status & (PCI_STATUS_PARITY)) {
610 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700611 "Master Data Parity Error on "
612 "%s\n", pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700613
614 atomic_inc(&pci_parity_count);
615 }
616
617 if (status & (PCI_STATUS_DETECTED_PARITY)) {
618 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700619 "Detected Parity Error on %s\n",
620 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700621
622 atomic_inc(&pci_parity_count);
623 }
624 }
625 }
626}
627
Doug Thompsond4c14652007-07-26 10:41:15 -0700628/* reduce some complexity in definition of the iterator */
629typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
630
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700631/*
632 * pci_dev parity list iterator
Wei Yongjun3bfe5aa2012-12-04 00:01:42 -0500633 *
634 * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or
635 * Parity ERRORs on primary or secondary devices.
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700636 */
637static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
638{
639 struct pci_dev *dev = NULL;
640
Wei Yongjun3bfe5aa2012-12-04 00:01:42 -0500641 for_each_pci_dev(dev)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700642 fn(dev);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700643}
644
645/*
646 * edac_pci_do_parity_check
647 *
648 * performs the actual PCI parity check operation
649 */
650void edac_pci_do_parity_check(void)
651{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700652 int before_count;
653
Joe Perches956b9ba2012-04-29 17:08:39 -0300654 edac_dbg(3, "\n");
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700655
Doug Thompsond4c14652007-07-26 10:41:15 -0700656 /* if policy has PCI check off, leave now */
Dave Jiang91b99042007-07-19 01:49:52 -0700657 if (!check_pci_errors)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700658 return;
659
660 before_count = atomic_read(&pci_parity_count);
661
662 /* scan all PCI devices looking for a Parity Error on devices and
Doug Thompsond4c14652007-07-26 10:41:15 -0700663 * bridges.
664 * The iterator calls pci_get_device() which might sleep, thus
665 * we cannot disable interrupts in this scan.
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700666 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700667 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700668
669 /* Only if operator has selected panic on PCI Error */
Dave Jiang4de78c62007-07-19 01:49:54 -0700670 if (edac_pci_get_panic_on_pe()) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700671 /* If the count is different 'after' from 'before' */
672 if (before_count != atomic_read(&pci_parity_count))
673 panic("EDAC: PCI Parity Error");
674 }
675}
676
Doug Thompsond4c14652007-07-26 10:41:15 -0700677/*
678 * edac_pci_clear_parity_errors
679 *
680 * function to perform an iteration over the PCI devices
681 * and clearn their current status
682 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700683void edac_pci_clear_parity_errors(void)
684{
685 /* Clear any PCI bus parity errors that devices initially have logged
686 * in their registers.
687 */
688 edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
689}
Doug Thompsond4c14652007-07-26 10:41:15 -0700690
691/*
692 * edac_pci_handle_pe
693 *
694 * Called to handle a PARITY ERROR event
695 */
Dave Jiang91b99042007-07-19 01:49:52 -0700696void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
697{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700698
Dave Jiang91b99042007-07-19 01:49:52 -0700699 /* global PE counter incremented by edac_pci_do_parity_check() */
700 atomic_inc(&pci->counters.pe_count);
701
Dave Jiang4de78c62007-07-19 01:49:54 -0700702 if (edac_pci_get_log_pe())
Dave Jiang91b99042007-07-19 01:49:52 -0700703 edac_pci_printk(pci, KERN_WARNING,
704 "Parity Error ctl: %s %d: %s\n",
705 pci->ctl_name, pci->pci_idx, msg);
706
707 /*
708 * poke all PCI devices and see which one is the troublemaker
709 * panic() is called if set
710 */
711 edac_pci_do_parity_check();
712}
713EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
714
Doug Thompsond4c14652007-07-26 10:41:15 -0700715
716/*
717 * edac_pci_handle_npe
718 *
719 * Called to handle a NON-PARITY ERROR event
720 */
Dave Jiang91b99042007-07-19 01:49:52 -0700721void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
722{
723
724 /* global NPE counter incremented by edac_pci_do_parity_check() */
725 atomic_inc(&pci->counters.npe_count);
726
Dave Jiang4de78c62007-07-19 01:49:54 -0700727 if (edac_pci_get_log_npe())
Dave Jiang91b99042007-07-19 01:49:52 -0700728 edac_pci_printk(pci, KERN_WARNING,
729 "Non-Parity Error ctl: %s %d: %s\n",
730 pci->ctl_name, pci->pci_idx, msg);
731
732 /*
733 * poke all PCI devices and see which one is the troublemaker
734 * panic() is called if set
735 */
736 edac_pci_do_parity_check();
737}
738EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700739
740/*
741 * Define the PCI parameter to the module
742 */
Dave Jiang91b99042007-07-19 01:49:52 -0700743module_param(check_pci_errors, int, 0644);
Dave Jiang4de78c62007-07-19 01:49:54 -0700744MODULE_PARM_DESC(check_pci_errors,
Douglas Thompson079708b2007-07-19 01:49:58 -0700745 "Check for PCI bus parity errors: 0=off 1=on");
Dave Jiang4de78c62007-07-19 01:49:54 -0700746module_param(edac_pci_panic_on_pe, int, 0644);
747MODULE_PARM_DESC(edac_pci_panic_on_pe,
Douglas Thompson079708b2007-07-19 01:49:58 -0700748 "Panic on PCI Bus Parity error: 0=off 1=on");