Commit | Line | Data |
---|---|---|
20bcb7a8 | 1 | /* |
7c9281d7 DT |
2 | * (C) 2005, 2006 Linux Networx (http://lnxi.com) |
3 | * This file may be distributed under the terms of the | |
4 | * GNU General Public License. | |
5 | * | |
6 | * Written Doug Thompson <norsk5@xmission.com> | |
7 | * | |
8 | */ | |
9 | #include <linux/module.h> | |
30e1f7a8 | 10 | #include <linux/edac.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
7c9281d7 DT |
12 | #include <linux/ctype.h> |
13 | ||
0b892c71 | 14 | #include "edac_pci.h" |
7c9281d7 DT |
15 | #include "edac_module.h" |
16 | ||
91b99041 DJ |
17 | #define EDAC_PCI_SYMLINK "device" |
18 | ||
d4c1465b DT |
19 | /* data variables exported via sysfs */ |
20 | static int check_pci_errors; /* default NO check PCI parity */ | |
21 | static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */ | |
22 | static int edac_pci_log_pe = 1; /* log PCI parity errors */ | |
4de78c68 | 23 | static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */ |
d4c1465b DT |
24 | static int edac_pci_poll_msec = 1000; /* one second workq period */ |
25 | ||
7c9281d7 | 26 | static atomic_t pci_parity_count = ATOMIC_INIT(0); |
91b99041 | 27 | static atomic_t pci_nonparity_count = ATOMIC_INIT(0); |
7c9281d7 | 28 | |
14cc571b | 29 | static struct kobject *edac_pci_top_main_kobj; |
91b99041 DJ |
30 | static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0); |
31 | ||
d4c1465b | 32 | /* getter functions for the data variables */ |
4de78c68 DJ |
33 | int edac_pci_get_check_errors(void) |
34 | { | |
35 | return check_pci_errors; | |
36 | } | |
37 | ||
1a45027d | 38 | static int edac_pci_get_log_pe(void) |
4de78c68 DJ |
39 | { |
40 | return edac_pci_log_pe; | |
41 | } | |
42 | ||
1a45027d | 43 | static int edac_pci_get_log_npe(void) |
4de78c68 DJ |
44 | { |
45 | return edac_pci_log_npe; | |
46 | } | |
47 | ||
1a45027d | 48 | static int edac_pci_get_panic_on_pe(void) |
4de78c68 DJ |
49 | { |
50 | return edac_pci_panic_on_pe; | |
51 | } | |
52 | ||
53 | int edac_pci_get_poll_msec(void) | |
54 | { | |
55 | return edac_pci_poll_msec; | |
56 | } | |
57 | ||
91b99041 DJ |
58 | /**************************** EDAC PCI sysfs instance *******************/ |
59 | static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data) | |
60 | { | |
079708b9 | 61 | return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count)); |
91b99041 DJ |
62 | } |
63 | ||
64 | static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci, | |
052dfb45 | 65 | char *data) |
91b99041 | 66 | { |
079708b9 | 67 | return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count)); |
91b99041 DJ |
68 | } |
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 */ | |
74 | static void edac_pci_instance_release(struct kobject *kobj) | |
75 | { | |
76 | struct edac_pci_ctl_info *pci; | |
77 | ||
956b9ba1 | 78 | edac_dbg(0, "\n"); |
91b99041 | 79 | |
d4c1465b | 80 | /* Form pointer to containing struct, the pci control struct */ |
91b99041 | 81 | pci = to_instance(kobj); |
d4c1465b DT |
82 | |
83 | /* decrement reference count on top main kobj */ | |
14cc571b | 84 | kobject_put(edac_pci_top_main_kobj); |
d4c1465b DT |
85 | |
86 | kfree(pci); /* Free the control struct */ | |
91b99041 DJ |
87 | } |
88 | ||
89 | /* instance specific attribute structure */ | |
90 | struct instance_attribute { | |
079708b9 | 91 | struct attribute attr; |
d4c1465b DT |
92 | ssize_t(*show) (struct edac_pci_ctl_info *, char *); |
93 | ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t); | |
91b99041 DJ |
94 | }; |
95 | ||
96 | /* Function to 'show' fields from the edac_pci 'instance' structure */ | |
97 | static ssize_t edac_pci_instance_show(struct kobject *kobj, | |
052dfb45 | 98 | struct attribute *attr, char *buffer) |
91b99041 | 99 | { |
079708b9 DT |
100 | struct edac_pci_ctl_info *pci = to_instance(kobj); |
101 | struct instance_attribute *instance_attr = to_instance_attr(attr); | |
91b99041 | 102 | |
079708b9 DT |
103 | if (instance_attr->show) |
104 | return instance_attr->show(pci, buffer); | |
105 | return -EIO; | |
91b99041 DJ |
106 | } |
107 | ||
91b99041 DJ |
108 | /* Function to 'store' fields into the edac_pci 'instance' structure */ |
109 | static ssize_t edac_pci_instance_store(struct kobject *kobj, | |
052dfb45 DT |
110 | struct attribute *attr, |
111 | const char *buffer, size_t count) | |
91b99041 | 112 | { |
079708b9 DT |
113 | struct edac_pci_ctl_info *pci = to_instance(kobj); |
114 | struct instance_attribute *instance_attr = to_instance_attr(attr); | |
91b99041 | 115 | |
079708b9 DT |
116 | if (instance_attr->store) |
117 | return instance_attr->store(pci, buffer, count); | |
118 | return -EIO; | |
91b99041 DJ |
119 | } |
120 | ||
d4c1465b | 121 | /* fs_ops table */ |
52cf25d0 | 122 | static const struct sysfs_ops pci_instance_ops = { |
91b99041 DJ |
123 | .show = edac_pci_instance_show, |
124 | .store = edac_pci_instance_store | |
125 | }; | |
126 | ||
127 | #define INSTANCE_ATTR(_name, _mode, _show, _store) \ | |
128 | static struct instance_attribute attr_instance_##_name = { \ | |
129 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
130 | .show = _show, \ | |
131 | .store = _store, \ | |
132 | }; | |
133 | ||
134 | INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL); | |
135 | INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL); | |
136 | ||
137 | /* pci instance attributes */ | |
625c6b55 | 138 | static struct attribute *pci_instance_attrs[] = { |
11413893 GKH |
139 | &attr_instance_pe_count.attr, |
140 | &attr_instance_npe_count.attr, | |
91b99041 DJ |
141 | NULL |
142 | }; | |
625c6b55 | 143 | ATTRIBUTE_GROUPS(pci_instance); |
7c9281d7 | 144 | |
d4c1465b | 145 | /* the ktype for a pci instance */ |
91b99041 DJ |
146 | static struct kobj_type ktype_pci_instance = { |
147 | .release = edac_pci_instance_release, | |
148 | .sysfs_ops = &pci_instance_ops, | |
625c6b55 | 149 | .default_groups = pci_instance_groups, |
91b99041 DJ |
150 | }; |
151 | ||
d4c1465b DT |
152 | /* |
153 | * edac_pci_create_instance_kobj | |
154 | * | |
155 | * construct one EDAC PCI instance's kobject for use | |
156 | */ | |
91b99041 DJ |
157 | static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx) |
158 | { | |
d4c1465b | 159 | struct kobject *main_kobj; |
91b99041 DJ |
160 | int err; |
161 | ||
956b9ba1 | 162 | edac_dbg(0, "\n"); |
d4c1465b | 163 | |
d4c1465b DT |
164 | /* First bump the ref count on the top main kobj, which will |
165 | * track the number of PCI instances we have, and thus nest | |
166 | * properly on keeping the module loaded | |
167 | */ | |
14cc571b | 168 | main_kobj = kobject_get(edac_pci_top_main_kobj); |
d4c1465b DT |
169 | if (!main_kobj) { |
170 | err = -ENODEV; | |
171 | goto error_out; | |
172 | } | |
173 | ||
174 | /* And now register this new kobject under the main kobj */ | |
b2ed215a | 175 | err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance, |
14cc571b | 176 | edac_pci_top_main_kobj, "pci%d", idx); |
91b99041 | 177 | if (err != 0) { |
956b9ba1 | 178 | edac_dbg(2, "failed to register instance pci%d\n", idx); |
14cc571b | 179 | kobject_put(edac_pci_top_main_kobj); |
d4c1465b | 180 | goto error_out; |
91b99041 DJ |
181 | } |
182 | ||
b2ed215a | 183 | kobject_uevent(&pci->kobj, KOBJ_ADD); |
956b9ba1 | 184 | edac_dbg(1, "Register instance 'pci%d' kobject\n", idx); |
91b99041 DJ |
185 | |
186 | return 0; | |
d4c1465b DT |
187 | |
188 | /* Error unwind statck */ | |
189 | error_out: | |
190 | return err; | |
91b99041 DJ |
191 | } |
192 | ||
d4c1465b DT |
193 | /* |
194 | * edac_pci_unregister_sysfs_instance_kobj | |
195 | * | |
196 | * unregister the kobj for the EDAC PCI instance | |
197 | */ | |
1a45027d AB |
198 | static void edac_pci_unregister_sysfs_instance_kobj( |
199 | struct edac_pci_ctl_info *pci) | |
91b99041 | 200 | { |
956b9ba1 | 201 | edac_dbg(0, "\n"); |
d4c1465b DT |
202 | |
203 | /* Unregister the instance kobject and allow its release | |
204 | * function release the main reference count and then | |
205 | * kfree the memory | |
206 | */ | |
c10997f6 | 207 | kobject_put(&pci->kobj); |
91b99041 DJ |
208 | } |
209 | ||
210 | /***************************** EDAC PCI sysfs root **********************/ | |
211 | #define to_edacpci(k) container_of(k, struct edac_pci_ctl_info, kobj) | |
212 | #define to_edacpci_attr(a) container_of(a, struct edac_pci_attr, attr) | |
7c9281d7 | 213 | |
d4c1465b | 214 | /* simple show/store functions for attributes */ |
7c9281d7 DT |
215 | static ssize_t edac_pci_int_show(void *ptr, char *buffer) |
216 | { | |
217 | int *value = ptr; | |
079708b9 | 218 | return sprintf(buffer, "%d\n", *value); |
7c9281d7 DT |
219 | } |
220 | ||
221 | static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count) | |
222 | { | |
223 | int *value = ptr; | |
224 | ||
225 | if (isdigit(*buffer)) | |
079708b9 | 226 | *value = simple_strtoul(buffer, NULL, 0); |
7c9281d7 DT |
227 | |
228 | return count; | |
229 | } | |
230 | ||
231 | struct edac_pci_dev_attribute { | |
232 | struct attribute attr; | |
233 | void *value; | |
079708b9 DT |
234 | ssize_t(*show) (void *, char *); |
235 | ssize_t(*store) (void *, const char *, size_t); | |
7c9281d7 DT |
236 | }; |
237 | ||
238 | /* Set of show/store abstract level functions for PCI Parity object */ | |
239 | static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr, | |
079708b9 | 240 | char *buffer) |
7c9281d7 DT |
241 | { |
242 | struct edac_pci_dev_attribute *edac_pci_dev; | |
079708b9 | 243 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
7c9281d7 DT |
244 | |
245 | if (edac_pci_dev->show) | |
246 | return edac_pci_dev->show(edac_pci_dev->value, buffer); | |
247 | return -EIO; | |
248 | } | |
249 | ||
250 | static ssize_t edac_pci_dev_store(struct kobject *kobj, | |
052dfb45 DT |
251 | struct attribute *attr, const char *buffer, |
252 | size_t count) | |
7c9281d7 DT |
253 | { |
254 | struct edac_pci_dev_attribute *edac_pci_dev; | |
079708b9 | 255 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
7c9281d7 | 256 | |
8024c4c0 | 257 | if (edac_pci_dev->store) |
7c9281d7 DT |
258 | return edac_pci_dev->store(edac_pci_dev->value, buffer, count); |
259 | return -EIO; | |
260 | } | |
261 | ||
52cf25d0 | 262 | static const struct sysfs_ops edac_pci_sysfs_ops = { |
079708b9 DT |
263 | .show = edac_pci_dev_show, |
264 | .store = edac_pci_dev_store | |
7c9281d7 DT |
265 | }; |
266 | ||
267 | #define EDAC_PCI_ATTR(_name,_mode,_show,_store) \ | |
268 | static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ | |
269 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
270 | .value = &_name, \ | |
271 | .show = _show, \ | |
272 | .store = _store, \ | |
273 | }; | |
274 | ||
275 | #define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \ | |
276 | static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ | |
277 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
278 | .value = _data, \ | |
279 | .show = _show, \ | |
280 | .store = _store, \ | |
281 | }; | |
282 | ||
283 | /* PCI Parity control files */ | |
079708b9 | 284 | EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 285 | edac_pci_int_store); |
079708b9 | 286 | EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 287 | edac_pci_int_store); |
079708b9 | 288 | EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 289 | edac_pci_int_store); |
079708b9 | 290 | EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 291 | edac_pci_int_store); |
7c9281d7 | 292 | EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL); |
91b99041 | 293 | EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL); |
7c9281d7 DT |
294 | |
295 | /* Base Attributes of the memory ECC object */ | |
625c6b55 | 296 | static struct attribute *edac_pci_attrs[] = { |
11413893 GKH |
297 | &edac_pci_attr_check_pci_errors.attr, |
298 | &edac_pci_attr_edac_pci_log_pe.attr, | |
299 | &edac_pci_attr_edac_pci_log_npe.attr, | |
300 | &edac_pci_attr_edac_pci_panic_on_pe.attr, | |
301 | &edac_pci_attr_pci_parity_count.attr, | |
302 | &edac_pci_attr_pci_nonparity_count.attr, | |
7c9281d7 DT |
303 | NULL, |
304 | }; | |
625c6b55 | 305 | ATTRIBUTE_GROUPS(edac_pci); |
7c9281d7 | 306 | |
d4c1465b DT |
307 | /* |
308 | * edac_pci_release_main_kobj | |
309 | * | |
310 | * This release function is called when the reference count to the | |
311 | * passed kobj goes to zero. | |
312 | * | |
313 | * This kobj is the 'main' kobject that EDAC PCI instances | |
314 | * link to, and thus provide for proper nesting counts | |
315 | */ | |
316 | static void edac_pci_release_main_kobj(struct kobject *kobj) | |
7c9281d7 | 317 | { |
956b9ba1 | 318 | edac_dbg(0, "here to module_put(THIS_MODULE)\n"); |
91b99041 | 319 | |
14cc571b AJ |
320 | kfree(kobj); |
321 | ||
d4c1465b DT |
322 | /* last reference to top EDAC PCI kobject has been removed, |
323 | * NOW release our ref count on the core module | |
324 | */ | |
325 | module_put(THIS_MODULE); | |
7c9281d7 DT |
326 | } |
327 | ||
d4c1465b DT |
328 | /* ktype struct for the EDAC PCI main kobj */ |
329 | static struct kobj_type ktype_edac_pci_main_kobj = { | |
330 | .release = edac_pci_release_main_kobj, | |
7c9281d7 | 331 | .sysfs_ops = &edac_pci_sysfs_ops, |
625c6b55 | 332 | .default_groups = edac_pci_groups, |
7c9281d7 DT |
333 | }; |
334 | ||
335 | /** | |
d4538000 | 336 | * edac_pci_main_kobj_setup: Setup the sysfs for EDAC PCI attributes. |
7c9281d7 | 337 | */ |
1a45027d | 338 | static int edac_pci_main_kobj_setup(void) |
7c9281d7 DT |
339 | { |
340 | int err; | |
fe5ff8b8 | 341 | struct bus_type *edac_subsys; |
7c9281d7 | 342 | |
956b9ba1 | 343 | edac_dbg(0, "\n"); |
d4c1465b DT |
344 | |
345 | /* check and count if we have already created the main kobject */ | |
346 | if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1) | |
347 | return 0; | |
7c9281d7 | 348 | |
d4c1465b | 349 | /* First time, so create the main kobject and its |
25985edc | 350 | * controls and attributes |
d4c1465b | 351 | */ |
fe5ff8b8 | 352 | edac_subsys = edac_get_sysfs_subsys(); |
7c9281d7 | 353 | |
d4c1465b DT |
354 | /* Bump the reference count on this module to ensure the |
355 | * modules isn't unloaded until we deconstruct the top | |
356 | * level main kobj for EDAC PCI | |
357 | */ | |
358 | if (!try_module_get(THIS_MODULE)) { | |
956b9ba1 | 359 | edac_dbg(1, "try_module_get() failed\n"); |
d4c1465b | 360 | err = -ENODEV; |
733476cf | 361 | goto decrement_count_fail; |
d4c1465b | 362 | } |
7c9281d7 | 363 | |
14cc571b AJ |
364 | edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); |
365 | if (!edac_pci_top_main_kobj) { | |
956b9ba1 | 366 | edac_dbg(1, "Failed to allocate\n"); |
14cc571b AJ |
367 | err = -ENOMEM; |
368 | goto kzalloc_fail; | |
369 | } | |
370 | ||
91b99041 | 371 | /* Instanstiate the pci object */ |
14cc571b AJ |
372 | err = kobject_init_and_add(edac_pci_top_main_kobj, |
373 | &ktype_edac_pci_main_kobj, | |
fe5ff8b8 | 374 | &edac_subsys->dev_root->kobj, "pci"); |
91b99041 | 375 | if (err) { |
956b9ba1 | 376 | edac_dbg(1, "Failed to register '.../edac/pci'\n"); |
b2ed215a | 377 | goto kobject_init_and_add_fail; |
7c9281d7 DT |
378 | } |
379 | ||
d4c1465b DT |
380 | /* At this point, to 'release' the top level kobject |
381 | * for EDAC PCI, then edac_pci_main_kobj_teardown() | |
382 | * must be used, for resources to be cleaned up properly | |
383 | */ | |
14cc571b | 384 | kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD); |
956b9ba1 | 385 | edac_dbg(1, "Registered '.../edac/pci' kobject\n"); |
91b99041 DJ |
386 | |
387 | return 0; | |
d4c1465b DT |
388 | |
389 | /* Error unwind statck */ | |
b2ed215a | 390 | kobject_init_and_add_fail: |
17ed808a | 391 | kobject_put(edac_pci_top_main_kobj); |
14cc571b AJ |
392 | |
393 | kzalloc_fail: | |
d4c1465b DT |
394 | module_put(THIS_MODULE); |
395 | ||
396 | decrement_count_fail: | |
397 | /* if are on this error exit, nothing to tear down */ | |
398 | atomic_dec(&edac_pci_sysfs_refcount); | |
399 | ||
400 | return err; | |
7c9281d7 DT |
401 | } |
402 | ||
403 | /* | |
d4c1465b | 404 | * edac_pci_main_kobj_teardown() |
7c9281d7 | 405 | * |
d4c1465b DT |
406 | * if no longer linked (needed) remove the top level EDAC PCI |
407 | * kobject with its controls and attributes | |
7c9281d7 | 408 | */ |
d4c1465b | 409 | static void edac_pci_main_kobj_teardown(void) |
7c9281d7 | 410 | { |
956b9ba1 | 411 | edac_dbg(0, "\n"); |
d4c1465b DT |
412 | |
413 | /* Decrement the count and only if no more controller instances | |
414 | * are connected perform the unregisteration of the top level | |
415 | * main kobj | |
416 | */ | |
417 | if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) { | |
956b9ba1 | 418 | edac_dbg(0, "called kobject_put on main kobj\n"); |
14cc571b | 419 | kobject_put(edac_pci_top_main_kobj); |
d4c1465b | 420 | } |
7c9281d7 DT |
421 | } |
422 | ||
91b99041 DJ |
423 | int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci) |
424 | { | |
425 | int err; | |
426 | struct kobject *edac_kobj = &pci->kobj; | |
427 | ||
956b9ba1 | 428 | edac_dbg(0, "idx=%d\n", pci->pci_idx); |
91b99041 | 429 | |
d4c1465b DT |
430 | /* create the top main EDAC PCI kobject, IF needed */ |
431 | err = edac_pci_main_kobj_setup(); | |
432 | if (err) | |
433 | return err; | |
7c9281d7 | 434 | |
d4c1465b DT |
435 | /* Create this instance's kobject under the MAIN kobject */ |
436 | err = edac_pci_create_instance_kobj(pci, pci->pci_idx); | |
437 | if (err) | |
438 | goto unregister_cleanup; | |
91b99041 | 439 | |
079708b9 | 440 | err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK); |
91b99041 | 441 | if (err) { |
956b9ba1 | 442 | edac_dbg(0, "sysfs_create_link() returned err= %d\n", err); |
d4c1465b | 443 | goto symlink_fail; |
91b99041 DJ |
444 | } |
445 | ||
446 | return 0; | |
d4c1465b DT |
447 | |
448 | /* Error unwind stack */ | |
449 | symlink_fail: | |
450 | edac_pci_unregister_sysfs_instance_kobj(pci); | |
451 | ||
452 | unregister_cleanup: | |
453 | edac_pci_main_kobj_teardown(); | |
454 | ||
455 | return err; | |
91b99041 DJ |
456 | } |
457 | ||
458 | void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci) | |
459 | { | |
956b9ba1 | 460 | edac_dbg(0, "index=%d\n", pci->pci_idx); |
91b99041 | 461 | |
d4c1465b | 462 | /* Remove the symlink */ |
91b99041 DJ |
463 | sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK); |
464 | ||
d4c1465b DT |
465 | /* remove this PCI instance's sysfs entries */ |
466 | edac_pci_unregister_sysfs_instance_kobj(pci); | |
467 | ||
468 | /* Call the main unregister function, which will determine | |
469 | * if this 'pci' is the last instance. | |
470 | * If it is, the main kobject will be unregistered as a result | |
471 | */ | |
956b9ba1 | 472 | edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n"); |
d4c1465b | 473 | edac_pci_main_kobj_teardown(); |
91b99041 DJ |
474 | } |
475 | ||
476 | /************************ PCI error handling *************************/ | |
7c9281d7 DT |
477 | static u16 get_pci_parity_status(struct pci_dev *dev, int secondary) |
478 | { | |
479 | int where; | |
480 | u16 status; | |
481 | ||
482 | where = secondary ? PCI_SEC_STATUS : PCI_STATUS; | |
483 | pci_read_config_word(dev, where, &status); | |
484 | ||
485 | /* If we get back 0xFFFF then we must suspect that the card has been | |
486 | * pulled but the Linux PCI layer has not yet finished cleaning up. | |
487 | * We don't want to report on such devices | |
488 | */ | |
489 | ||
490 | if (status == 0xFFFF) { | |
491 | u32 sanity; | |
492 | ||
493 | pci_read_config_dword(dev, 0, &sanity); | |
494 | ||
495 | if (sanity == 0xFFFFFFFF) | |
496 | return 0; | |
497 | } | |
498 | ||
499 | status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | | |
052dfb45 | 500 | PCI_STATUS_PARITY; |
7c9281d7 DT |
501 | |
502 | if (status) | |
503 | /* reset only the bits we are interested in */ | |
504 | pci_write_config_word(dev, where, status); | |
505 | ||
506 | return status; | |
507 | } | |
508 | ||
7c9281d7 DT |
509 | |
510 | /* Clear any PCI parity errors logged by this device. */ | |
511 | static void edac_pci_dev_parity_clear(struct pci_dev *dev) | |
512 | { | |
513 | u8 header_type; | |
514 | ||
515 | get_pci_parity_status(dev, 0); | |
516 | ||
517 | /* read the device TYPE, looking for bridges */ | |
518 | pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); | |
519 | ||
520 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) | |
521 | get_pci_parity_status(dev, 1); | |
522 | } | |
523 | ||
524 | /* | |
525 | * PCI Parity polling | |
526 | * | |
25985edc | 527 | * Function to retrieve the current parity status |
d4c1465b DT |
528 | * and decode it |
529 | * | |
7c9281d7 DT |
530 | */ |
531 | static void edac_pci_dev_parity_test(struct pci_dev *dev) | |
532 | { | |
d4c1465b | 533 | unsigned long flags; |
7c9281d7 | 534 | u16 status; |
079708b9 | 535 | u8 header_type; |
7c9281d7 | 536 | |
d4c1465b DT |
537 | /* stop any interrupts until we can acquire the status */ |
538 | local_irq_save(flags); | |
539 | ||
540 | /* read the STATUS register on this device */ | |
7c9281d7 DT |
541 | status = get_pci_parity_status(dev, 0); |
542 | ||
d4c1465b DT |
543 | /* read the device TYPE, looking for bridges */ |
544 | pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); | |
545 | ||
546 | local_irq_restore(flags); | |
547 | ||
956b9ba1 | 548 | edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev)); |
7c9281d7 | 549 | |
6b09ff9d BB |
550 | /* check the status reg for errors on boards NOT marked as broken |
551 | * if broken, we cannot trust any of the status bits | |
552 | */ | |
553 | if (status && !dev->broken_parity_status) { | |
91b99041 | 554 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
7c9281d7 | 555 | edac_printk(KERN_CRIT, EDAC_PCI, |
052dfb45 DT |
556 | "Signaled System Error on %s\n", |
557 | pci_name(dev)); | |
91b99041 DJ |
558 | atomic_inc(&pci_nonparity_count); |
559 | } | |
7c9281d7 DT |
560 | |
561 | if (status & (PCI_STATUS_PARITY)) { | |
562 | edac_printk(KERN_CRIT, EDAC_PCI, | |
052dfb45 DT |
563 | "Master Data Parity Error on %s\n", |
564 | pci_name(dev)); | |
7c9281d7 DT |
565 | |
566 | atomic_inc(&pci_parity_count); | |
567 | } | |
568 | ||
569 | if (status & (PCI_STATUS_DETECTED_PARITY)) { | |
570 | edac_printk(KERN_CRIT, EDAC_PCI, | |
052dfb45 DT |
571 | "Detected Parity Error on %s\n", |
572 | pci_name(dev)); | |
7c9281d7 DT |
573 | |
574 | atomic_inc(&pci_parity_count); | |
575 | } | |
576 | } | |
577 | ||
7c9281d7 | 578 | |
956b9ba1 JP |
579 | edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n", |
580 | header_type, dev_name(&dev->dev)); | |
7c9281d7 DT |
581 | |
582 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { | |
583 | /* On bridges, need to examine secondary status register */ | |
584 | status = get_pci_parity_status(dev, 1); | |
585 | ||
956b9ba1 JP |
586 | edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n", |
587 | status, dev_name(&dev->dev)); | |
7c9281d7 | 588 | |
6b09ff9d BB |
589 | /* check the secondary status reg for errors, |
590 | * on NOT broken boards | |
591 | */ | |
592 | if (status && !dev->broken_parity_status) { | |
91b99041 | 593 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
7c9281d7 | 594 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " |
052dfb45 DT |
595 | "Signaled System Error on %s\n", |
596 | pci_name(dev)); | |
91b99041 DJ |
597 | atomic_inc(&pci_nonparity_count); |
598 | } | |
7c9281d7 DT |
599 | |
600 | if (status & (PCI_STATUS_PARITY)) { | |
601 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " | |
052dfb45 DT |
602 | "Master Data Parity Error on " |
603 | "%s\n", pci_name(dev)); | |
7c9281d7 DT |
604 | |
605 | atomic_inc(&pci_parity_count); | |
606 | } | |
607 | ||
608 | if (status & (PCI_STATUS_DETECTED_PARITY)) { | |
609 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " | |
052dfb45 DT |
610 | "Detected Parity Error on %s\n", |
611 | pci_name(dev)); | |
7c9281d7 DT |
612 | |
613 | atomic_inc(&pci_parity_count); | |
614 | } | |
615 | } | |
616 | } | |
617 | } | |
618 | ||
d4c1465b DT |
619 | /* reduce some complexity in definition of the iterator */ |
620 | typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev); | |
621 | ||
7c9281d7 DT |
622 | /* |
623 | * pci_dev parity list iterator | |
3bfe5aae WY |
624 | * |
625 | * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or | |
626 | * Parity ERRORs on primary or secondary devices. | |
7c9281d7 DT |
627 | */ |
628 | static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn) | |
629 | { | |
630 | struct pci_dev *dev = NULL; | |
631 | ||
3bfe5aae | 632 | for_each_pci_dev(dev) |
7c9281d7 | 633 | fn(dev); |
7c9281d7 DT |
634 | } |
635 | ||
636 | /* | |
637 | * edac_pci_do_parity_check | |
638 | * | |
639 | * performs the actual PCI parity check operation | |
640 | */ | |
641 | void edac_pci_do_parity_check(void) | |
642 | { | |
7c9281d7 DT |
643 | int before_count; |
644 | ||
956b9ba1 | 645 | edac_dbg(3, "\n"); |
7c9281d7 | 646 | |
d4c1465b | 647 | /* if policy has PCI check off, leave now */ |
91b99041 | 648 | if (!check_pci_errors) |
7c9281d7 DT |
649 | return; |
650 | ||
651 | before_count = atomic_read(&pci_parity_count); | |
652 | ||
653 | /* scan all PCI devices looking for a Parity Error on devices and | |
d4c1465b DT |
654 | * bridges. |
655 | * The iterator calls pci_get_device() which might sleep, thus | |
656 | * we cannot disable interrupts in this scan. | |
7c9281d7 | 657 | */ |
7c9281d7 | 658 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_test); |
7c9281d7 DT |
659 | |
660 | /* Only if operator has selected panic on PCI Error */ | |
4de78c68 | 661 | if (edac_pci_get_panic_on_pe()) { |
7c9281d7 DT |
662 | /* If the count is different 'after' from 'before' */ |
663 | if (before_count != atomic_read(&pci_parity_count)) | |
664 | panic("EDAC: PCI Parity Error"); | |
665 | } | |
666 | } | |
667 | ||
d4c1465b DT |
668 | /* |
669 | * edac_pci_clear_parity_errors | |
670 | * | |
671 | * function to perform an iteration over the PCI devices | |
672 | * and clearn their current status | |
673 | */ | |
7c9281d7 DT |
674 | void edac_pci_clear_parity_errors(void) |
675 | { | |
676 | /* Clear any PCI bus parity errors that devices initially have logged | |
677 | * in their registers. | |
678 | */ | |
679 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear); | |
680 | } | |
d4c1465b DT |
681 | |
682 | /* | |
683 | * edac_pci_handle_pe | |
684 | * | |
685 | * Called to handle a PARITY ERROR event | |
686 | */ | |
91b99041 DJ |
687 | void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg) |
688 | { | |
689 | ||
690 | /* global PE counter incremented by edac_pci_do_parity_check() */ | |
691 | atomic_inc(&pci->counters.pe_count); | |
692 | ||
4de78c68 | 693 | if (edac_pci_get_log_pe()) |
91b99041 DJ |
694 | edac_pci_printk(pci, KERN_WARNING, |
695 | "Parity Error ctl: %s %d: %s\n", | |
696 | pci->ctl_name, pci->pci_idx, msg); | |
697 | ||
698 | /* | |
699 | * poke all PCI devices and see which one is the troublemaker | |
700 | * panic() is called if set | |
701 | */ | |
702 | edac_pci_do_parity_check(); | |
703 | } | |
704 | EXPORT_SYMBOL_GPL(edac_pci_handle_pe); | |
7c9281d7 | 705 | |
d4c1465b DT |
706 | |
707 | /* | |
708 | * edac_pci_handle_npe | |
709 | * | |
710 | * Called to handle a NON-PARITY ERROR event | |
711 | */ | |
91b99041 DJ |
712 | void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg) |
713 | { | |
714 | ||
715 | /* global NPE counter incremented by edac_pci_do_parity_check() */ | |
716 | atomic_inc(&pci->counters.npe_count); | |
717 | ||
4de78c68 | 718 | if (edac_pci_get_log_npe()) |
91b99041 DJ |
719 | edac_pci_printk(pci, KERN_WARNING, |
720 | "Non-Parity Error ctl: %s %d: %s\n", | |
721 | pci->ctl_name, pci->pci_idx, msg); | |
722 | ||
723 | /* | |
724 | * poke all PCI devices and see which one is the troublemaker | |
725 | * panic() is called if set | |
726 | */ | |
727 | edac_pci_do_parity_check(); | |
728 | } | |
729 | EXPORT_SYMBOL_GPL(edac_pci_handle_npe); | |
7c9281d7 DT |
730 | |
731 | /* | |
732 | * Define the PCI parameter to the module | |
733 | */ | |
91b99041 | 734 | module_param(check_pci_errors, int, 0644); |
4de78c68 | 735 | MODULE_PARM_DESC(check_pci_errors, |
079708b9 | 736 | "Check for PCI bus parity errors: 0=off 1=on"); |
4de78c68 DJ |
737 | module_param(edac_pci_panic_on_pe, int, 0644); |
738 | MODULE_PARM_DESC(edac_pci_panic_on_pe, | |
079708b9 | 739 | "Panic on PCI Bus Parity error: 0=off 1=on"); |