blob: 422728cfe99493ec078bae3d8a392470be157130 [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
Doug Thompsond4c14652007-07-26 10:41:15 -070016/* Turn off this whole feature if PCI is not configured */
Douglas Thompson7c9281d2007-07-19 01:49:33 -070017#ifdef CONFIG_PCI
Dave Jiang91b99042007-07-19 01:49:52 -070018
19#define EDAC_PCI_SYMLINK "device"
20
Doug Thompsond4c14652007-07-26 10:41:15 -070021/* data variables exported via sysfs */
22static int check_pci_errors; /* default NO check PCI parity */
23static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */
24static int edac_pci_log_pe = 1; /* log PCI parity errors */
Dave Jiang4de78c62007-07-19 01:49:54 -070025static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */
Doug Thompsond4c14652007-07-26 10:41:15 -070026static int edac_pci_poll_msec = 1000; /* one second workq period */
27
Douglas Thompson7c9281d2007-07-19 01:49:33 -070028static atomic_t pci_parity_count = ATOMIC_INIT(0);
Dave Jiang91b99042007-07-19 01:49:52 -070029static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -070030
Arthur Jones14cc5712008-07-25 01:49:08 -070031static struct kobject *edac_pci_top_main_kobj;
Dave Jiang91b99042007-07-19 01:49:52 -070032static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -070033
Doug Thompsond4c14652007-07-26 10:41:15 -070034/* getter functions for the data variables */
Dave Jiang4de78c62007-07-19 01:49:54 -070035int edac_pci_get_check_errors(void)
36{
37 return check_pci_errors;
38}
39
Adrian Bunk1a450272008-04-29 01:03:18 -070040static int edac_pci_get_log_pe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070041{
42 return edac_pci_log_pe;
43}
44
Adrian Bunk1a450272008-04-29 01:03:18 -070045static int edac_pci_get_log_npe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070046{
47 return edac_pci_log_npe;
48}
49
Adrian Bunk1a450272008-04-29 01:03:18 -070050static int edac_pci_get_panic_on_pe(void)
Dave Jiang4de78c62007-07-19 01:49:54 -070051{
52 return edac_pci_panic_on_pe;
53}
54
55int edac_pci_get_poll_msec(void)
56{
57 return edac_pci_poll_msec;
58}
59
Dave Jiang91b99042007-07-19 01:49:52 -070060/**************************** EDAC PCI sysfs instance *******************/
61static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
62{
Douglas Thompson079708b2007-07-19 01:49:58 -070063 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070064}
65
66static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
Douglas Thompson052dfb42007-07-19 01:50:13 -070067 char *data)
Dave Jiang91b99042007-07-19 01:49:52 -070068{
Douglas Thompson079708b2007-07-19 01:49:58 -070069 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
Dave Jiang91b99042007-07-19 01:49:52 -070070}
71
72#define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
73#define to_instance_attr(a) container_of(a, struct instance_attribute, attr)
74
75/* DEVICE instance kobject release() function */
76static void edac_pci_instance_release(struct kobject *kobj)
77{
78 struct edac_pci_ctl_info *pci;
79
Doug Thompsond4c14652007-07-26 10:41:15 -070080 debugf0("%s()\n", __func__);
Dave Jiang91b99042007-07-19 01:49:52 -070081
Doug Thompsond4c14652007-07-26 10:41:15 -070082 /* Form pointer to containing struct, the pci control struct */
Dave Jiang91b99042007-07-19 01:49:52 -070083 pci = to_instance(kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -070084
85 /* decrement reference count on top main kobj */
Arthur Jones14cc5712008-07-25 01:49:08 -070086 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -070087
88 kfree(pci); /* Free the control struct */
Dave Jiang91b99042007-07-19 01:49:52 -070089}
90
91/* instance specific attribute structure */
92struct instance_attribute {
Douglas Thompson079708b2007-07-19 01:49:58 -070093 struct attribute attr;
Doug Thompsond4c14652007-07-26 10:41:15 -070094 ssize_t(*show) (struct edac_pci_ctl_info *, char *);
95 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
Dave Jiang91b99042007-07-19 01:49:52 -070096};
97
98/* Function to 'show' fields from the edac_pci 'instance' structure */
99static ssize_t edac_pci_instance_show(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700100 struct attribute *attr, char *buffer)
Dave Jiang91b99042007-07-19 01:49:52 -0700101{
Douglas Thompson079708b2007-07-19 01:49:58 -0700102 struct edac_pci_ctl_info *pci = to_instance(kobj);
103 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700104
Douglas Thompson079708b2007-07-19 01:49:58 -0700105 if (instance_attr->show)
106 return instance_attr->show(pci, buffer);
107 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700108}
109
Dave Jiang91b99042007-07-19 01:49:52 -0700110/* Function to 'store' fields into the edac_pci 'instance' structure */
111static ssize_t edac_pci_instance_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700112 struct attribute *attr,
113 const char *buffer, size_t count)
Dave Jiang91b99042007-07-19 01:49:52 -0700114{
Douglas Thompson079708b2007-07-19 01:49:58 -0700115 struct edac_pci_ctl_info *pci = to_instance(kobj);
116 struct instance_attribute *instance_attr = to_instance_attr(attr);
Dave Jiang91b99042007-07-19 01:49:52 -0700117
Douglas Thompson079708b2007-07-19 01:49:58 -0700118 if (instance_attr->store)
119 return instance_attr->store(pci, buffer, count);
120 return -EIO;
Dave Jiang91b99042007-07-19 01:49:52 -0700121}
122
Doug Thompsond4c14652007-07-26 10:41:15 -0700123/* fs_ops table */
Dave Jiang91b99042007-07-19 01:49:52 -0700124static struct sysfs_ops pci_instance_ops = {
125 .show = edac_pci_instance_show,
126 .store = edac_pci_instance_store
127};
128
129#define INSTANCE_ATTR(_name, _mode, _show, _store) \
130static struct instance_attribute attr_instance_##_name = { \
131 .attr = {.name = __stringify(_name), .mode = _mode }, \
132 .show = _show, \
133 .store = _store, \
134};
135
136INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
137INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
138
139/* pci instance attributes */
140static struct instance_attribute *pci_instance_attr[] = {
141 &attr_instance_pe_count,
142 &attr_instance_npe_count,
143 NULL
144};
145
Doug Thompsond4c14652007-07-26 10:41:15 -0700146/* the ktype for a pci instance */
Dave Jiang91b99042007-07-19 01:49:52 -0700147static struct kobj_type ktype_pci_instance = {
148 .release = edac_pci_instance_release,
149 .sysfs_ops = &pci_instance_ops,
150 .default_attrs = (struct attribute **)pci_instance_attr,
151};
152
Doug Thompsond4c14652007-07-26 10:41:15 -0700153/*
154 * edac_pci_create_instance_kobj
155 *
156 * construct one EDAC PCI instance's kobject for use
157 */
Dave Jiang91b99042007-07-19 01:49:52 -0700158static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
159{
Doug Thompsond4c14652007-07-26 10:41:15 -0700160 struct kobject *main_kobj;
Dave Jiang91b99042007-07-19 01:49:52 -0700161 int err;
162
Doug Thompsond4c14652007-07-26 10:41:15 -0700163 debugf0("%s()\n", __func__);
164
Doug Thompsond4c14652007-07-26 10:41:15 -0700165 /* First bump the ref count on the top main kobj, which will
166 * track the number of PCI instances we have, and thus nest
167 * properly on keeping the module loaded
168 */
Arthur Jones14cc5712008-07-25 01:49:08 -0700169 main_kobj = kobject_get(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700170 if (!main_kobj) {
171 err = -ENODEV;
172 goto error_out;
173 }
174
175 /* And now register this new kobject under the main kobj */
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400176 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
Arthur Jones14cc5712008-07-25 01:49:08 -0700177 edac_pci_top_main_kobj, "pci%d", idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700178 if (err != 0) {
179 debugf2("%s() failed to register instance pci%d\n",
Douglas Thompson079708b2007-07-19 01:49:58 -0700180 __func__, idx);
Arthur Jones14cc5712008-07-25 01:49:08 -0700181 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700182 goto error_out;
Dave Jiang91b99042007-07-19 01:49:52 -0700183 }
184
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400185 kobject_uevent(&pci->kobj, KOBJ_ADD);
Dave Jiang91b99042007-07-19 01:49:52 -0700186 debugf1("%s() Register instance 'pci%d' kobject\n", __func__, idx);
187
188 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700189
190 /* Error unwind statck */
191error_out:
192 return err;
Dave Jiang91b99042007-07-19 01:49:52 -0700193}
194
Doug Thompsond4c14652007-07-26 10:41:15 -0700195/*
196 * edac_pci_unregister_sysfs_instance_kobj
197 *
198 * unregister the kobj for the EDAC PCI instance
199 */
Adrian Bunk1a450272008-04-29 01:03:18 -0700200static void edac_pci_unregister_sysfs_instance_kobj(
201 struct edac_pci_ctl_info *pci)
Dave Jiang91b99042007-07-19 01:49:52 -0700202{
Doug Thompsond4c14652007-07-26 10:41:15 -0700203 debugf0("%s()\n", __func__);
204
205 /* Unregister the instance kobject and allow its release
206 * function release the main reference count and then
207 * kfree the memory
208 */
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800209 kobject_put(&pci->kobj);
Dave Jiang91b99042007-07-19 01:49:52 -0700210}
211
212/***************************** EDAC PCI sysfs root **********************/
213#define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj)
214#define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700215
Doug Thompsond4c14652007-07-26 10:41:15 -0700216/* simple show/store functions for attributes */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700217static ssize_t edac_pci_int_show(void *ptr, char *buffer)
218{
219 int *value = ptr;
Douglas Thompson079708b2007-07-19 01:49:58 -0700220 return sprintf(buffer, "%d\n", *value);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700221}
222
223static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
224{
225 int *value = ptr;
226
227 if (isdigit(*buffer))
Douglas Thompson079708b2007-07-19 01:49:58 -0700228 *value = simple_strtoul(buffer, NULL, 0);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700229
230 return count;
231}
232
233struct edac_pci_dev_attribute {
234 struct attribute attr;
235 void *value;
Douglas Thompson079708b2007-07-19 01:49:58 -0700236 ssize_t(*show) (void *, char *);
237 ssize_t(*store) (void *, const char *, size_t);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700238};
239
240/* Set of show/store abstract level functions for PCI Parity object */
241static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
Douglas Thompson079708b2007-07-19 01:49:58 -0700242 char *buffer)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700243{
244 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700245 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700246
247 if (edac_pci_dev->show)
248 return edac_pci_dev->show(edac_pci_dev->value, buffer);
249 return -EIO;
250}
251
252static ssize_t edac_pci_dev_store(struct kobject *kobj,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700253 struct attribute *attr, const char *buffer,
254 size_t count)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700255{
256 struct edac_pci_dev_attribute *edac_pci_dev;
Douglas Thompson079708b2007-07-19 01:49:58 -0700257 edac_pci_dev = (struct edac_pci_dev_attribute *)attr;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700258
259 if (edac_pci_dev->show)
260 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
261 return -EIO;
262}
263
264static struct sysfs_ops edac_pci_sysfs_ops = {
Douglas Thompson079708b2007-07-19 01:49:58 -0700265 .show = edac_pci_dev_show,
266 .store = edac_pci_dev_store
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700267};
268
269#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \
270static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
271 .attr = {.name = __stringify(_name), .mode = _mode }, \
272 .value = &_name, \
273 .show = _show, \
274 .store = _store, \
275};
276
277#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \
278static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \
279 .attr = {.name = __stringify(_name), .mode = _mode }, \
280 .value = _data, \
281 .show = _show, \
282 .store = _store, \
283};
284
285/* PCI Parity control files */
Douglas Thompson079708b2007-07-19 01:49:58 -0700286EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700287 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700288EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700289 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700290EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700291 edac_pci_int_store);
Douglas Thompson079708b2007-07-19 01:49:58 -0700292EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700293 edac_pci_int_store);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700294EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
Dave Jiang91b99042007-07-19 01:49:52 -0700295EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700296
297/* Base Attributes of the memory ECC object */
298static struct edac_pci_dev_attribute *edac_pci_attr[] = {
Dave Jiang91b99042007-07-19 01:49:52 -0700299 &edac_pci_attr_check_pci_errors,
Dave Jiang4de78c62007-07-19 01:49:54 -0700300 &edac_pci_attr_edac_pci_log_pe,
301 &edac_pci_attr_edac_pci_log_npe,
302 &edac_pci_attr_edac_pci_panic_on_pe,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700303 &edac_pci_attr_pci_parity_count,
Dave Jiang91b99042007-07-19 01:49:52 -0700304 &edac_pci_attr_pci_nonparity_count,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700305 NULL,
306};
307
Doug Thompsond4c14652007-07-26 10:41:15 -0700308/*
309 * edac_pci_release_main_kobj
310 *
311 * This release function is called when the reference count to the
312 * passed kobj goes to zero.
313 *
314 * This kobj is the 'main' kobject that EDAC PCI instances
315 * link to, and thus provide for proper nesting counts
316 */
317static void edac_pci_release_main_kobj(struct kobject *kobj)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700318{
Doug Thompsond4c14652007-07-26 10:41:15 -0700319 debugf0("%s() here to module_put(THIS_MODULE)\n", __func__);
Dave Jiang91b99042007-07-19 01:49:52 -0700320
Arthur Jones14cc5712008-07-25 01:49:08 -0700321 kfree(kobj);
322
Doug Thompsond4c14652007-07-26 10:41:15 -0700323 /* last reference to top EDAC PCI kobject has been removed,
324 * NOW release our ref count on the core module
325 */
326 module_put(THIS_MODULE);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700327}
328
Doug Thompsond4c14652007-07-26 10:41:15 -0700329/* ktype struct for the EDAC PCI main kobj */
330static struct kobj_type ktype_edac_pci_main_kobj = {
331 .release = edac_pci_release_main_kobj,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700332 .sysfs_ops = &edac_pci_sysfs_ops,
Douglas Thompson079708b2007-07-19 01:49:58 -0700333 .default_attrs = (struct attribute **)edac_pci_attr,
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700334};
335
336/**
Doug Thompsond4c14652007-07-26 10:41:15 -0700337 * edac_pci_main_kobj_setup()
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700338 *
339 * setup the sysfs for EDAC PCI attributes
340 * assumes edac_class has already been initialized
341 */
Adrian Bunk1a450272008-04-29 01:03:18 -0700342static int edac_pci_main_kobj_setup(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700343{
344 int err;
345 struct sysdev_class *edac_class;
346
Doug Thompsond4c14652007-07-26 10:41:15 -0700347 debugf0("%s()\n", __func__);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700348
Doug Thompsond4c14652007-07-26 10:41:15 -0700349 /* check and count if we have already created the main kobject */
350 if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
351 return 0;
352
353 /* First time, so create the main kobject and its
354 * controls and atributes
355 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700356 edac_class = edac_get_edac_class();
Dave Jiang91b99042007-07-19 01:49:52 -0700357 if (edac_class == NULL) {
358 debugf1("%s() no edac_class\n", __func__);
Doug Thompsond4c14652007-07-26 10:41:15 -0700359 err = -ENODEV;
360 goto decrement_count_fail;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700361 }
362
Doug Thompsond4c14652007-07-26 10:41:15 -0700363 /* Bump the reference count on this module to ensure the
364 * modules isn't unloaded until we deconstruct the top
365 * level main kobj for EDAC PCI
366 */
367 if (!try_module_get(THIS_MODULE)) {
368 debugf1("%s() try_module_get() failed\n", __func__);
369 err = -ENODEV;
370 goto decrement_count_fail;
371 }
Dave Jiang91b99042007-07-19 01:49:52 -0700372
Arthur Jones14cc5712008-07-25 01:49:08 -0700373 edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
374 if (!edac_pci_top_main_kobj) {
375 debugf1("Failed to allocate\n");
376 err = -ENOMEM;
377 goto kzalloc_fail;
378 }
379
Dave Jiang91b99042007-07-19 01:49:52 -0700380 /* Instanstiate the pci object */
Arthur Jones14cc5712008-07-25 01:49:08 -0700381 err = kobject_init_and_add(edac_pci_top_main_kobj,
382 &ktype_edac_pci_main_kobj,
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400383 &edac_class->kset.kobj, "pci");
Dave Jiang91b99042007-07-19 01:49:52 -0700384 if (err) {
385 debugf1("Failed to register '.../edac/pci'\n");
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400386 goto kobject_init_and_add_fail;
Dave Jiang91b99042007-07-19 01:49:52 -0700387 }
388
Doug Thompsond4c14652007-07-26 10:41:15 -0700389 /* At this point, to 'release' the top level kobject
390 * for EDAC PCI, then edac_pci_main_kobj_teardown()
391 * must be used, for resources to be cleaned up properly
392 */
Arthur Jones14cc5712008-07-25 01:49:08 -0700393 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
Dave Jiang91b99042007-07-19 01:49:52 -0700394 debugf1("Registered '.../edac/pci' kobject\n");
395
396 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700397
398 /* Error unwind statck */
Greg Kroah-Hartmanb2ed2152007-12-17 15:54:39 -0400399kobject_init_and_add_fail:
Arthur Jones14cc5712008-07-25 01:49:08 -0700400 kfree(edac_pci_top_main_kobj);
401
402kzalloc_fail:
Doug Thompsond4c14652007-07-26 10:41:15 -0700403 module_put(THIS_MODULE);
404
405decrement_count_fail:
406 /* if are on this error exit, nothing to tear down */
407 atomic_dec(&edac_pci_sysfs_refcount);
408
409 return err;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700410}
411
412/*
Doug Thompsond4c14652007-07-26 10:41:15 -0700413 * edac_pci_main_kobj_teardown()
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700414 *
Doug Thompsond4c14652007-07-26 10:41:15 -0700415 * if no longer linked (needed) remove the top level EDAC PCI
416 * kobject with its controls and attributes
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700417 */
Doug Thompsond4c14652007-07-26 10:41:15 -0700418static void edac_pci_main_kobj_teardown(void)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700419{
420 debugf0("%s()\n", __func__);
Doug Thompsond4c14652007-07-26 10:41:15 -0700421
422 /* Decrement the count and only if no more controller instances
423 * are connected perform the unregisteration of the top level
424 * main kobj
425 */
426 if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800427 debugf0("%s() called kobject_put on main kobj\n",
Doug Thompsond4c14652007-07-26 10:41:15 -0700428 __func__);
Arthur Jones14cc5712008-07-25 01:49:08 -0700429 kobject_put(edac_pci_top_main_kobj);
Doug Thompsond4c14652007-07-26 10:41:15 -0700430 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700431}
432
Doug Thompsond4c14652007-07-26 10:41:15 -0700433/*
434 *
435 * edac_pci_create_sysfs
436 *
437 * Create the controls/attributes for the specified EDAC PCI device
438 */
Dave Jiang91b99042007-07-19 01:49:52 -0700439int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
440{
441 int err;
442 struct kobject *edac_kobj = &pci->kobj;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700443
Dave Jiang91b99042007-07-19 01:49:52 -0700444 debugf0("%s() idx=%d\n", __func__, pci->pci_idx);
445
Doug Thompsond4c14652007-07-26 10:41:15 -0700446 /* create the top main EDAC PCI kobject, IF needed */
447 err = edac_pci_main_kobj_setup();
448 if (err)
449 return err;
450
451 /* Create this instance's kobject under the MAIN kobject */
452 err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
453 if (err)
454 goto unregister_cleanup;
455
Douglas Thompson079708b2007-07-19 01:49:58 -0700456 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
Dave Jiang91b99042007-07-19 01:49:52 -0700457 if (err) {
458 debugf0("%s() sysfs_create_link() returned err= %d\n",
Douglas Thompson079708b2007-07-19 01:49:58 -0700459 __func__, err);
Doug Thompsond4c14652007-07-26 10:41:15 -0700460 goto symlink_fail;
Dave Jiang91b99042007-07-19 01:49:52 -0700461 }
462
463 return 0;
Doug Thompsond4c14652007-07-26 10:41:15 -0700464
465 /* Error unwind stack */
466symlink_fail:
467 edac_pci_unregister_sysfs_instance_kobj(pci);
468
469unregister_cleanup:
470 edac_pci_main_kobj_teardown();
471
472 return err;
Dave Jiang91b99042007-07-19 01:49:52 -0700473}
474
Doug Thompsond4c14652007-07-26 10:41:15 -0700475/*
476 * edac_pci_remove_sysfs
477 *
478 * remove the controls and attributes for this EDAC PCI device
479 */
Dave Jiang91b99042007-07-19 01:49:52 -0700480void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
481{
Doug Thompsond4c14652007-07-26 10:41:15 -0700482 debugf0("%s() index=%d\n", __func__, pci->pci_idx);
Dave Jiang91b99042007-07-19 01:49:52 -0700483
Doug Thompsond4c14652007-07-26 10:41:15 -0700484 /* Remove the symlink */
Dave Jiang91b99042007-07-19 01:49:52 -0700485 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
486
Doug Thompsond4c14652007-07-26 10:41:15 -0700487 /* remove this PCI instance's sysfs entries */
488 edac_pci_unregister_sysfs_instance_kobj(pci);
489
490 /* Call the main unregister function, which will determine
491 * if this 'pci' is the last instance.
492 * If it is, the main kobject will be unregistered as a result
493 */
494 debugf0("%s() calling edac_pci_main_kobj_teardown()\n", __func__);
495 edac_pci_main_kobj_teardown();
Dave Jiang91b99042007-07-19 01:49:52 -0700496}
497
498/************************ PCI error handling *************************/
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700499static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
500{
501 int where;
502 u16 status;
503
504 where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
505 pci_read_config_word(dev, where, &status);
506
507 /* If we get back 0xFFFF then we must suspect that the card has been
508 * pulled but the Linux PCI layer has not yet finished cleaning up.
509 * We don't want to report on such devices
510 */
511
512 if (status == 0xFFFF) {
513 u32 sanity;
514
515 pci_read_config_dword(dev, 0, &sanity);
516
517 if (sanity == 0xFFFFFFFF)
518 return 0;
519 }
520
521 status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
Douglas Thompson052dfb42007-07-19 01:50:13 -0700522 PCI_STATUS_PARITY;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700523
524 if (status)
525 /* reset only the bits we are interested in */
526 pci_write_config_word(dev, where, status);
527
528 return status;
529}
530
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700531
532/* Clear any PCI parity errors logged by this device. */
533static void edac_pci_dev_parity_clear(struct pci_dev *dev)
534{
535 u8 header_type;
536
Doug Thompsond4c14652007-07-26 10:41:15 -0700537 debugf0("%s()\n", __func__);
538
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700539 get_pci_parity_status(dev, 0);
540
541 /* read the device TYPE, looking for bridges */
542 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
543
544 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
545 get_pci_parity_status(dev, 1);
546}
547
548/*
549 * PCI Parity polling
550 *
Doug Thompsond4c14652007-07-26 10:41:15 -0700551 * Fucntion to retrieve the current parity status
552 * and decode it
553 *
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700554 */
555static void edac_pci_dev_parity_test(struct pci_dev *dev)
556{
Doug Thompsond4c14652007-07-26 10:41:15 -0700557 unsigned long flags;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700558 u16 status;
Douglas Thompson079708b2007-07-19 01:49:58 -0700559 u8 header_type;
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700560
Doug Thompsond4c14652007-07-26 10:41:15 -0700561 /* stop any interrupts until we can acquire the status */
562 local_irq_save(flags);
563
564 /* read the STATUS register on this device */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700565 status = get_pci_parity_status(dev, 0);
566
Doug Thompsond4c14652007-07-26 10:41:15 -0700567 /* read the device TYPE, looking for bridges */
568 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
569
570 local_irq_restore(flags);
571
Kay Sievers281efb12009-01-06 14:42:57 -0800572 debugf4("PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700573
Bryan Boatright6b09ff92008-02-07 00:14:58 -0800574 /* check the status reg for errors on boards NOT marked as broken
575 * if broken, we cannot trust any of the status bits
576 */
577 if (status && !dev->broken_parity_status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700578 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700579 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700580 "Signaled System Error on %s\n",
581 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700582 atomic_inc(&pci_nonparity_count);
583 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700584
585 if (status & (PCI_STATUS_PARITY)) {
586 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700587 "Master Data Parity Error on %s\n",
588 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700589
590 atomic_inc(&pci_parity_count);
591 }
592
593 if (status & (PCI_STATUS_DETECTED_PARITY)) {
594 edac_printk(KERN_CRIT, EDAC_PCI,
Douglas Thompson052dfb42007-07-19 01:50:13 -0700595 "Detected Parity Error on %s\n",
596 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700597
598 atomic_inc(&pci_parity_count);
599 }
600 }
601
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700602
Kay Sievers281efb12009-01-06 14:42:57 -0800603 debugf4("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700604
605 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
606 /* On bridges, need to examine secondary status register */
607 status = get_pci_parity_status(dev, 1);
608
Kay Sievers281efb12009-01-06 14:42:57 -0800609 debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700610
Bryan Boatright6b09ff92008-02-07 00:14:58 -0800611 /* check the secondary status reg for errors,
612 * on NOT broken boards
613 */
614 if (status && !dev->broken_parity_status) {
Dave Jiang91b99042007-07-19 01:49:52 -0700615 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700616 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700617 "Signaled System Error on %s\n",
618 pci_name(dev));
Dave Jiang91b99042007-07-19 01:49:52 -0700619 atomic_inc(&pci_nonparity_count);
620 }
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700621
622 if (status & (PCI_STATUS_PARITY)) {
623 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700624 "Master Data Parity Error on "
625 "%s\n", pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700626
627 atomic_inc(&pci_parity_count);
628 }
629
630 if (status & (PCI_STATUS_DETECTED_PARITY)) {
631 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
Douglas Thompson052dfb42007-07-19 01:50:13 -0700632 "Detected Parity Error on %s\n",
633 pci_name(dev));
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700634
635 atomic_inc(&pci_parity_count);
636 }
637 }
638 }
639}
640
Doug Thompsond4c14652007-07-26 10:41:15 -0700641/* reduce some complexity in definition of the iterator */
642typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
643
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700644/*
645 * pci_dev parity list iterator
Doug Thompsond4c14652007-07-26 10:41:15 -0700646 * Scan the PCI device list for one pass, looking for SERRORs
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700647 * Master Parity ERRORS or Parity ERRORs on primary or secondary devices
648 */
649static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
650{
651 struct pci_dev *dev = NULL;
652
653 /* request for kernel access to the next PCI device, if any,
654 * and while we are looking at it have its reference count
655 * bumped until we are done with it
656 */
Douglas Thompson079708b2007-07-19 01:49:58 -0700657 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700658 fn(dev);
659 }
660}
661
662/*
663 * edac_pci_do_parity_check
664 *
665 * performs the actual PCI parity check operation
666 */
667void edac_pci_do_parity_check(void)
668{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700669 int before_count;
670
671 debugf3("%s()\n", __func__);
672
Doug Thompsond4c14652007-07-26 10:41:15 -0700673 /* if policy has PCI check off, leave now */
Dave Jiang91b99042007-07-19 01:49:52 -0700674 if (!check_pci_errors)
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700675 return;
676
677 before_count = atomic_read(&pci_parity_count);
678
679 /* scan all PCI devices looking for a Parity Error on devices and
Doug Thompsond4c14652007-07-26 10:41:15 -0700680 * bridges.
681 * The iterator calls pci_get_device() which might sleep, thus
682 * we cannot disable interrupts in this scan.
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700683 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700684 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700685
686 /* Only if operator has selected panic on PCI Error */
Dave Jiang4de78c62007-07-19 01:49:54 -0700687 if (edac_pci_get_panic_on_pe()) {
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700688 /* If the count is different 'after' from 'before' */
689 if (before_count != atomic_read(&pci_parity_count))
690 panic("EDAC: PCI Parity Error");
691 }
692}
693
Doug Thompsond4c14652007-07-26 10:41:15 -0700694/*
695 * edac_pci_clear_parity_errors
696 *
697 * function to perform an iteration over the PCI devices
698 * and clearn their current status
699 */
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700700void edac_pci_clear_parity_errors(void)
701{
702 /* Clear any PCI bus parity errors that devices initially have logged
703 * in their registers.
704 */
705 edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
706}
Doug Thompsond4c14652007-07-26 10:41:15 -0700707
708/*
709 * edac_pci_handle_pe
710 *
711 * Called to handle a PARITY ERROR event
712 */
Dave Jiang91b99042007-07-19 01:49:52 -0700713void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
714{
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700715
Dave Jiang91b99042007-07-19 01:49:52 -0700716 /* global PE counter incremented by edac_pci_do_parity_check() */
717 atomic_inc(&pci->counters.pe_count);
718
Dave Jiang4de78c62007-07-19 01:49:54 -0700719 if (edac_pci_get_log_pe())
Dave Jiang91b99042007-07-19 01:49:52 -0700720 edac_pci_printk(pci, KERN_WARNING,
721 "Parity Error ctl: %s %d: %s\n",
722 pci->ctl_name, pci->pci_idx, msg);
723
724 /*
725 * poke all PCI devices and see which one is the troublemaker
726 * panic() is called if set
727 */
728 edac_pci_do_parity_check();
729}
730EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
731
Doug Thompsond4c14652007-07-26 10:41:15 -0700732
733/*
734 * edac_pci_handle_npe
735 *
736 * Called to handle a NON-PARITY ERROR event
737 */
Dave Jiang91b99042007-07-19 01:49:52 -0700738void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
739{
740
741 /* global NPE counter incremented by edac_pci_do_parity_check() */
742 atomic_inc(&pci->counters.npe_count);
743
Dave Jiang4de78c62007-07-19 01:49:54 -0700744 if (edac_pci_get_log_npe())
Dave Jiang91b99042007-07-19 01:49:52 -0700745 edac_pci_printk(pci, KERN_WARNING,
746 "Non-Parity Error ctl: %s %d: %s\n",
747 pci->ctl_name, pci->pci_idx, msg);
748
749 /*
750 * poke all PCI devices and see which one is the troublemaker
751 * panic() is called if set
752 */
753 edac_pci_do_parity_check();
754}
755EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700756
757/*
758 * Define the PCI parameter to the module
759 */
Dave Jiang91b99042007-07-19 01:49:52 -0700760module_param(check_pci_errors, int, 0644);
Dave Jiang4de78c62007-07-19 01:49:54 -0700761MODULE_PARM_DESC(check_pci_errors,
Douglas Thompson079708b2007-07-19 01:49:58 -0700762 "Check for PCI bus parity errors: 0=off 1=on");
Dave Jiang4de78c62007-07-19 01:49:54 -0700763module_param(edac_pci_panic_on_pe, int, 0644);
764MODULE_PARM_DESC(edac_pci_panic_on_pe,
Douglas Thompson079708b2007-07-19 01:49:58 -0700765 "Panic on PCI Bus Parity error: 0=off 1=on");
Douglas Thompson7c9281d2007-07-19 01:49:33 -0700766
Douglas Thompson079708b2007-07-19 01:49:58 -0700767#endif /* CONFIG_PCI */