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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 */ | |
138 | static struct instance_attribute *pci_instance_attr[] = { | |
139 | &attr_instance_pe_count, | |
140 | &attr_instance_npe_count, | |
141 | NULL | |
142 | }; | |
7c9281d7 | 143 | |
d4c1465b | 144 | /* the ktype for a pci instance */ |
91b99041 DJ |
145 | static 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 | ||
d4c1465b DT |
151 | /* |
152 | * edac_pci_create_instance_kobj | |
153 | * | |
154 | * construct one EDAC PCI instance's kobject for use | |
155 | */ | |
91b99041 DJ |
156 | static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx) |
157 | { | |
d4c1465b | 158 | struct kobject *main_kobj; |
91b99041 DJ |
159 | int err; |
160 | ||
956b9ba1 | 161 | edac_dbg(0, "\n"); |
d4c1465b | 162 | |
d4c1465b DT |
163 | /* 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 | */ | |
14cc571b | 167 | main_kobj = kobject_get(edac_pci_top_main_kobj); |
d4c1465b DT |
168 | if (!main_kobj) { |
169 | err = -ENODEV; | |
170 | goto error_out; | |
171 | } | |
172 | ||
173 | /* And now register this new kobject under the main kobj */ | |
b2ed215a | 174 | err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance, |
14cc571b | 175 | edac_pci_top_main_kobj, "pci%d", idx); |
91b99041 | 176 | if (err != 0) { |
956b9ba1 | 177 | edac_dbg(2, "failed to register instance pci%d\n", idx); |
14cc571b | 178 | kobject_put(edac_pci_top_main_kobj); |
d4c1465b | 179 | goto error_out; |
91b99041 DJ |
180 | } |
181 | ||
b2ed215a | 182 | kobject_uevent(&pci->kobj, KOBJ_ADD); |
956b9ba1 | 183 | edac_dbg(1, "Register instance 'pci%d' kobject\n", idx); |
91b99041 DJ |
184 | |
185 | return 0; | |
d4c1465b DT |
186 | |
187 | /* Error unwind statck */ | |
188 | error_out: | |
189 | return err; | |
91b99041 DJ |
190 | } |
191 | ||
d4c1465b DT |
192 | /* |
193 | * edac_pci_unregister_sysfs_instance_kobj | |
194 | * | |
195 | * unregister the kobj for the EDAC PCI instance | |
196 | */ | |
1a45027d AB |
197 | static void edac_pci_unregister_sysfs_instance_kobj( |
198 | struct edac_pci_ctl_info *pci) | |
91b99041 | 199 | { |
956b9ba1 | 200 | edac_dbg(0, "\n"); |
d4c1465b DT |
201 | |
202 | /* Unregister the instance kobject and allow its release | |
203 | * function release the main reference count and then | |
204 | * kfree the memory | |
205 | */ | |
c10997f6 | 206 | kobject_put(&pci->kobj); |
91b99041 DJ |
207 | } |
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) | |
7c9281d7 | 212 | |
d4c1465b | 213 | /* simple show/store functions for attributes */ |
7c9281d7 DT |
214 | static ssize_t edac_pci_int_show(void *ptr, char *buffer) |
215 | { | |
216 | int *value = ptr; | |
079708b9 | 217 | return sprintf(buffer, "%d\n", *value); |
7c9281d7 DT |
218 | } |
219 | ||
220 | static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count) | |
221 | { | |
222 | int *value = ptr; | |
223 | ||
224 | if (isdigit(*buffer)) | |
079708b9 | 225 | *value = simple_strtoul(buffer, NULL, 0); |
7c9281d7 DT |
226 | |
227 | return count; | |
228 | } | |
229 | ||
230 | struct edac_pci_dev_attribute { | |
231 | struct attribute attr; | |
232 | void *value; | |
079708b9 DT |
233 | ssize_t(*show) (void *, char *); |
234 | ssize_t(*store) (void *, const char *, size_t); | |
7c9281d7 DT |
235 | }; |
236 | ||
237 | /* Set of show/store abstract level functions for PCI Parity object */ | |
238 | static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr, | |
079708b9 | 239 | char *buffer) |
7c9281d7 DT |
240 | { |
241 | struct edac_pci_dev_attribute *edac_pci_dev; | |
079708b9 | 242 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
7c9281d7 DT |
243 | |
244 | if (edac_pci_dev->show) | |
245 | return edac_pci_dev->show(edac_pci_dev->value, buffer); | |
246 | return -EIO; | |
247 | } | |
248 | ||
249 | static ssize_t edac_pci_dev_store(struct kobject *kobj, | |
052dfb45 DT |
250 | struct attribute *attr, const char *buffer, |
251 | size_t count) | |
7c9281d7 DT |
252 | { |
253 | struct edac_pci_dev_attribute *edac_pci_dev; | |
079708b9 | 254 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
7c9281d7 | 255 | |
8024c4c0 | 256 | if (edac_pci_dev->store) |
7c9281d7 DT |
257 | return edac_pci_dev->store(edac_pci_dev->value, buffer, count); |
258 | return -EIO; | |
259 | } | |
260 | ||
52cf25d0 | 261 | static const struct sysfs_ops edac_pci_sysfs_ops = { |
079708b9 DT |
262 | .show = edac_pci_dev_show, |
263 | .store = edac_pci_dev_store | |
7c9281d7 DT |
264 | }; |
265 | ||
266 | #define EDAC_PCI_ATTR(_name,_mode,_show,_store) \ | |
267 | static 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) \ | |
275 | static 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 */ | |
079708b9 | 283 | EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 284 | edac_pci_int_store); |
079708b9 | 285 | EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 286 | edac_pci_int_store); |
079708b9 | 287 | EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 288 | edac_pci_int_store); |
079708b9 | 289 | EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
052dfb45 | 290 | edac_pci_int_store); |
7c9281d7 | 291 | EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL); |
91b99041 | 292 | EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL); |
7c9281d7 DT |
293 | |
294 | /* Base Attributes of the memory ECC object */ | |
295 | static struct edac_pci_dev_attribute *edac_pci_attr[] = { | |
91b99041 | 296 | &edac_pci_attr_check_pci_errors, |
4de78c68 DJ |
297 | &edac_pci_attr_edac_pci_log_pe, |
298 | &edac_pci_attr_edac_pci_log_npe, | |
299 | &edac_pci_attr_edac_pci_panic_on_pe, | |
7c9281d7 | 300 | &edac_pci_attr_pci_parity_count, |
91b99041 | 301 | &edac_pci_attr_pci_nonparity_count, |
7c9281d7 DT |
302 | NULL, |
303 | }; | |
304 | ||
d4c1465b DT |
305 | /* |
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 | */ | |
314 | static void edac_pci_release_main_kobj(struct kobject *kobj) | |
7c9281d7 | 315 | { |
956b9ba1 | 316 | edac_dbg(0, "here to module_put(THIS_MODULE)\n"); |
91b99041 | 317 | |
14cc571b AJ |
318 | kfree(kobj); |
319 | ||
d4c1465b DT |
320 | /* 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); | |
7c9281d7 DT |
324 | } |
325 | ||
d4c1465b DT |
326 | /* ktype struct for the EDAC PCI main kobj */ |
327 | static struct kobj_type ktype_edac_pci_main_kobj = { | |
328 | .release = edac_pci_release_main_kobj, | |
7c9281d7 | 329 | .sysfs_ops = &edac_pci_sysfs_ops, |
079708b9 | 330 | .default_attrs = (struct attribute **)edac_pci_attr, |
7c9281d7 DT |
331 | }; |
332 | ||
333 | /** | |
d4538000 | 334 | * edac_pci_main_kobj_setup: Setup the sysfs for EDAC PCI attributes. |
7c9281d7 | 335 | */ |
1a45027d | 336 | static int edac_pci_main_kobj_setup(void) |
7c9281d7 DT |
337 | { |
338 | int err; | |
fe5ff8b8 | 339 | struct bus_type *edac_subsys; |
7c9281d7 | 340 | |
956b9ba1 | 341 | edac_dbg(0, "\n"); |
d4c1465b DT |
342 | |
343 | /* check and count if we have already created the main kobject */ | |
344 | if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1) | |
345 | return 0; | |
7c9281d7 | 346 | |
d4c1465b | 347 | /* First time, so create the main kobject and its |
25985edc | 348 | * controls and attributes |
d4c1465b | 349 | */ |
fe5ff8b8 | 350 | edac_subsys = edac_get_sysfs_subsys(); |
7c9281d7 | 351 | |
d4c1465b DT |
352 | /* 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)) { | |
956b9ba1 | 357 | edac_dbg(1, "try_module_get() failed\n"); |
d4c1465b | 358 | err = -ENODEV; |
733476cf | 359 | goto decrement_count_fail; |
d4c1465b | 360 | } |
7c9281d7 | 361 | |
14cc571b AJ |
362 | edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); |
363 | if (!edac_pci_top_main_kobj) { | |
956b9ba1 | 364 | edac_dbg(1, "Failed to allocate\n"); |
14cc571b AJ |
365 | err = -ENOMEM; |
366 | goto kzalloc_fail; | |
367 | } | |
368 | ||
91b99041 | 369 | /* Instanstiate the pci object */ |
14cc571b AJ |
370 | err = kobject_init_and_add(edac_pci_top_main_kobj, |
371 | &ktype_edac_pci_main_kobj, | |
fe5ff8b8 | 372 | &edac_subsys->dev_root->kobj, "pci"); |
91b99041 | 373 | if (err) { |
956b9ba1 | 374 | edac_dbg(1, "Failed to register '.../edac/pci'\n"); |
b2ed215a | 375 | goto kobject_init_and_add_fail; |
7c9281d7 DT |
376 | } |
377 | ||
d4c1465b DT |
378 | /* 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 | */ | |
14cc571b | 382 | kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD); |
956b9ba1 | 383 | edac_dbg(1, "Registered '.../edac/pci' kobject\n"); |
91b99041 DJ |
384 | |
385 | return 0; | |
d4c1465b DT |
386 | |
387 | /* Error unwind statck */ | |
b2ed215a | 388 | kobject_init_and_add_fail: |
17ed808a | 389 | kobject_put(edac_pci_top_main_kobj); |
14cc571b AJ |
390 | |
391 | kzalloc_fail: | |
d4c1465b DT |
392 | module_put(THIS_MODULE); |
393 | ||
394 | decrement_count_fail: | |
395 | /* if are on this error exit, nothing to tear down */ | |
396 | atomic_dec(&edac_pci_sysfs_refcount); | |
397 | ||
398 | return err; | |
7c9281d7 DT |
399 | } |
400 | ||
401 | /* | |
d4c1465b | 402 | * edac_pci_main_kobj_teardown() |
7c9281d7 | 403 | * |
d4c1465b DT |
404 | * if no longer linked (needed) remove the top level EDAC PCI |
405 | * kobject with its controls and attributes | |
7c9281d7 | 406 | */ |
d4c1465b | 407 | static void edac_pci_main_kobj_teardown(void) |
7c9281d7 | 408 | { |
956b9ba1 | 409 | edac_dbg(0, "\n"); |
d4c1465b DT |
410 | |
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) { | |
956b9ba1 | 416 | edac_dbg(0, "called kobject_put on main kobj\n"); |
14cc571b | 417 | kobject_put(edac_pci_top_main_kobj); |
d4c1465b | 418 | } |
7c9281d7 DT |
419 | } |
420 | ||
91b99041 DJ |
421 | int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci) |
422 | { | |
423 | int err; | |
424 | struct kobject *edac_kobj = &pci->kobj; | |
425 | ||
956b9ba1 | 426 | edac_dbg(0, "idx=%d\n", pci->pci_idx); |
91b99041 | 427 | |
d4c1465b DT |
428 | /* create the top main EDAC PCI kobject, IF needed */ |
429 | err = edac_pci_main_kobj_setup(); | |
430 | if (err) | |
431 | return err; | |
7c9281d7 | 432 | |
d4c1465b DT |
433 | /* Create this instance's kobject under the MAIN kobject */ |
434 | err = edac_pci_create_instance_kobj(pci, pci->pci_idx); | |
435 | if (err) | |
436 | goto unregister_cleanup; | |
91b99041 | 437 | |
079708b9 | 438 | err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK); |
91b99041 | 439 | if (err) { |
956b9ba1 | 440 | edac_dbg(0, "sysfs_create_link() returned err= %d\n", err); |
d4c1465b | 441 | goto symlink_fail; |
91b99041 DJ |
442 | } |
443 | ||
444 | return 0; | |
d4c1465b DT |
445 | |
446 | /* Error unwind stack */ | |
447 | symlink_fail: | |
448 | edac_pci_unregister_sysfs_instance_kobj(pci); | |
449 | ||
450 | unregister_cleanup: | |
451 | edac_pci_main_kobj_teardown(); | |
452 | ||
453 | return err; | |
91b99041 DJ |
454 | } |
455 | ||
456 | void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci) | |
457 | { | |
956b9ba1 | 458 | edac_dbg(0, "index=%d\n", pci->pci_idx); |
91b99041 | 459 | |
d4c1465b | 460 | /* Remove the symlink */ |
91b99041 DJ |
461 | sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK); |
462 | ||
d4c1465b DT |
463 | /* remove this PCI instance's sysfs entries */ |
464 | edac_pci_unregister_sysfs_instance_kobj(pci); | |
465 | ||
466 | /* Call the main unregister function, which will determine | |
467 | * if this 'pci' is the last instance. | |
468 | * If it is, the main kobject will be unregistered as a result | |
469 | */ | |
956b9ba1 | 470 | edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n"); |
d4c1465b | 471 | edac_pci_main_kobj_teardown(); |
91b99041 DJ |
472 | } |
473 | ||
474 | /************************ PCI error handling *************************/ | |
7c9281d7 DT |
475 | static u16 get_pci_parity_status(struct pci_dev *dev, int secondary) |
476 | { | |
477 | int where; | |
478 | u16 status; | |
479 | ||
480 | where = secondary ? PCI_SEC_STATUS : PCI_STATUS; | |
481 | pci_read_config_word(dev, where, &status); | |
482 | ||
483 | /* If we get back 0xFFFF then we must suspect that the card has been | |
484 | * pulled but the Linux PCI layer has not yet finished cleaning up. | |
485 | * We don't want to report on such devices | |
486 | */ | |
487 | ||
488 | if (status == 0xFFFF) { | |
489 | u32 sanity; | |
490 | ||
491 | pci_read_config_dword(dev, 0, &sanity); | |
492 | ||
493 | if (sanity == 0xFFFFFFFF) | |
494 | return 0; | |
495 | } | |
496 | ||
497 | status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | | |
052dfb45 | 498 | PCI_STATUS_PARITY; |
7c9281d7 DT |
499 | |
500 | if (status) | |
501 | /* reset only the bits we are interested in */ | |
502 | pci_write_config_word(dev, where, status); | |
503 | ||
504 | return status; | |
505 | } | |
506 | ||
7c9281d7 DT |
507 | |
508 | /* Clear any PCI parity errors logged by this device. */ | |
509 | static void edac_pci_dev_parity_clear(struct pci_dev *dev) | |
510 | { | |
511 | u8 header_type; | |
512 | ||
513 | get_pci_parity_status(dev, 0); | |
514 | ||
515 | /* read the device TYPE, looking for bridges */ | |
516 | pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); | |
517 | ||
518 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) | |
519 | get_pci_parity_status(dev, 1); | |
520 | } | |
521 | ||
522 | /* | |
523 | * PCI Parity polling | |
524 | * | |
25985edc | 525 | * Function to retrieve the current parity status |
d4c1465b DT |
526 | * and decode it |
527 | * | |
7c9281d7 DT |
528 | */ |
529 | static void edac_pci_dev_parity_test(struct pci_dev *dev) | |
530 | { | |
d4c1465b | 531 | unsigned long flags; |
7c9281d7 | 532 | u16 status; |
079708b9 | 533 | u8 header_type; |
7c9281d7 | 534 | |
d4c1465b DT |
535 | /* stop any interrupts until we can acquire the status */ |
536 | local_irq_save(flags); | |
537 | ||
538 | /* read the STATUS register on this device */ | |
7c9281d7 DT |
539 | status = get_pci_parity_status(dev, 0); |
540 | ||
d4c1465b DT |
541 | /* read the device TYPE, looking for bridges */ |
542 | pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); | |
543 | ||
544 | local_irq_restore(flags); | |
545 | ||
956b9ba1 | 546 | edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev)); |
7c9281d7 | 547 | |
6b09ff9d BB |
548 | /* check the status reg for errors on boards NOT marked as broken |
549 | * if broken, we cannot trust any of the status bits | |
550 | */ | |
551 | if (status && !dev->broken_parity_status) { | |
91b99041 | 552 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
7c9281d7 | 553 | edac_printk(KERN_CRIT, EDAC_PCI, |
052dfb45 DT |
554 | "Signaled System Error on %s\n", |
555 | pci_name(dev)); | |
91b99041 DJ |
556 | atomic_inc(&pci_nonparity_count); |
557 | } | |
7c9281d7 DT |
558 | |
559 | if (status & (PCI_STATUS_PARITY)) { | |
560 | edac_printk(KERN_CRIT, EDAC_PCI, | |
052dfb45 DT |
561 | "Master Data Parity Error on %s\n", |
562 | pci_name(dev)); | |
7c9281d7 DT |
563 | |
564 | atomic_inc(&pci_parity_count); | |
565 | } | |
566 | ||
567 | if (status & (PCI_STATUS_DETECTED_PARITY)) { | |
568 | edac_printk(KERN_CRIT, EDAC_PCI, | |
052dfb45 DT |
569 | "Detected Parity Error on %s\n", |
570 | pci_name(dev)); | |
7c9281d7 DT |
571 | |
572 | atomic_inc(&pci_parity_count); | |
573 | } | |
574 | } | |
575 | ||
7c9281d7 | 576 | |
956b9ba1 JP |
577 | edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n", |
578 | header_type, dev_name(&dev->dev)); | |
7c9281d7 DT |
579 | |
580 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { | |
581 | /* On bridges, need to examine secondary status register */ | |
582 | status = get_pci_parity_status(dev, 1); | |
583 | ||
956b9ba1 JP |
584 | edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n", |
585 | status, dev_name(&dev->dev)); | |
7c9281d7 | 586 | |
6b09ff9d BB |
587 | /* check the secondary status reg for errors, |
588 | * on NOT broken boards | |
589 | */ | |
590 | if (status && !dev->broken_parity_status) { | |
91b99041 | 591 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
7c9281d7 | 592 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " |
052dfb45 DT |
593 | "Signaled System Error on %s\n", |
594 | pci_name(dev)); | |
91b99041 DJ |
595 | atomic_inc(&pci_nonparity_count); |
596 | } | |
7c9281d7 DT |
597 | |
598 | if (status & (PCI_STATUS_PARITY)) { | |
599 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " | |
052dfb45 DT |
600 | "Master Data Parity Error on " |
601 | "%s\n", pci_name(dev)); | |
7c9281d7 DT |
602 | |
603 | atomic_inc(&pci_parity_count); | |
604 | } | |
605 | ||
606 | if (status & (PCI_STATUS_DETECTED_PARITY)) { | |
607 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " | |
052dfb45 DT |
608 | "Detected Parity Error on %s\n", |
609 | pci_name(dev)); | |
7c9281d7 DT |
610 | |
611 | atomic_inc(&pci_parity_count); | |
612 | } | |
613 | } | |
614 | } | |
615 | } | |
616 | ||
d4c1465b DT |
617 | /* reduce some complexity in definition of the iterator */ |
618 | typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev); | |
619 | ||
7c9281d7 DT |
620 | /* |
621 | * pci_dev parity list iterator | |
3bfe5aae WY |
622 | * |
623 | * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or | |
624 | * Parity ERRORs on primary or secondary devices. | |
7c9281d7 DT |
625 | */ |
626 | static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn) | |
627 | { | |
628 | struct pci_dev *dev = NULL; | |
629 | ||
3bfe5aae | 630 | for_each_pci_dev(dev) |
7c9281d7 | 631 | fn(dev); |
7c9281d7 DT |
632 | } |
633 | ||
634 | /* | |
635 | * edac_pci_do_parity_check | |
636 | * | |
637 | * performs the actual PCI parity check operation | |
638 | */ | |
639 | void edac_pci_do_parity_check(void) | |
640 | { | |
7c9281d7 DT |
641 | int before_count; |
642 | ||
956b9ba1 | 643 | edac_dbg(3, "\n"); |
7c9281d7 | 644 | |
d4c1465b | 645 | /* if policy has PCI check off, leave now */ |
91b99041 | 646 | if (!check_pci_errors) |
7c9281d7 DT |
647 | return; |
648 | ||
649 | before_count = atomic_read(&pci_parity_count); | |
650 | ||
651 | /* scan all PCI devices looking for a Parity Error on devices and | |
d4c1465b DT |
652 | * bridges. |
653 | * The iterator calls pci_get_device() which might sleep, thus | |
654 | * we cannot disable interrupts in this scan. | |
7c9281d7 | 655 | */ |
7c9281d7 | 656 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_test); |
7c9281d7 DT |
657 | |
658 | /* Only if operator has selected panic on PCI Error */ | |
4de78c68 | 659 | if (edac_pci_get_panic_on_pe()) { |
7c9281d7 DT |
660 | /* If the count is different 'after' from 'before' */ |
661 | if (before_count != atomic_read(&pci_parity_count)) | |
662 | panic("EDAC: PCI Parity Error"); | |
663 | } | |
664 | } | |
665 | ||
d4c1465b DT |
666 | /* |
667 | * edac_pci_clear_parity_errors | |
668 | * | |
669 | * function to perform an iteration over the PCI devices | |
670 | * and clearn their current status | |
671 | */ | |
7c9281d7 DT |
672 | void edac_pci_clear_parity_errors(void) |
673 | { | |
674 | /* Clear any PCI bus parity errors that devices initially have logged | |
675 | * in their registers. | |
676 | */ | |
677 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear); | |
678 | } | |
d4c1465b DT |
679 | |
680 | /* | |
681 | * edac_pci_handle_pe | |
682 | * | |
683 | * Called to handle a PARITY ERROR event | |
684 | */ | |
91b99041 DJ |
685 | void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg) |
686 | { | |
687 | ||
688 | /* global PE counter incremented by edac_pci_do_parity_check() */ | |
689 | atomic_inc(&pci->counters.pe_count); | |
690 | ||
4de78c68 | 691 | if (edac_pci_get_log_pe()) |
91b99041 DJ |
692 | edac_pci_printk(pci, KERN_WARNING, |
693 | "Parity Error ctl: %s %d: %s\n", | |
694 | pci->ctl_name, pci->pci_idx, msg); | |
695 | ||
696 | /* | |
697 | * poke all PCI devices and see which one is the troublemaker | |
698 | * panic() is called if set | |
699 | */ | |
700 | edac_pci_do_parity_check(); | |
701 | } | |
702 | EXPORT_SYMBOL_GPL(edac_pci_handle_pe); | |
7c9281d7 | 703 | |
d4c1465b DT |
704 | |
705 | /* | |
706 | * edac_pci_handle_npe | |
707 | * | |
708 | * Called to handle a NON-PARITY ERROR event | |
709 | */ | |
91b99041 DJ |
710 | void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg) |
711 | { | |
712 | ||
713 | /* global NPE counter incremented by edac_pci_do_parity_check() */ | |
714 | atomic_inc(&pci->counters.npe_count); | |
715 | ||
4de78c68 | 716 | if (edac_pci_get_log_npe()) |
91b99041 DJ |
717 | edac_pci_printk(pci, KERN_WARNING, |
718 | "Non-Parity Error ctl: %s %d: %s\n", | |
719 | pci->ctl_name, pci->pci_idx, msg); | |
720 | ||
721 | /* | |
722 | * poke all PCI devices and see which one is the troublemaker | |
723 | * panic() is called if set | |
724 | */ | |
725 | edac_pci_do_parity_check(); | |
726 | } | |
727 | EXPORT_SYMBOL_GPL(edac_pci_handle_npe); | |
7c9281d7 DT |
728 | |
729 | /* | |
730 | * Define the PCI parameter to the module | |
731 | */ | |
91b99041 | 732 | module_param(check_pci_errors, int, 0644); |
4de78c68 | 733 | MODULE_PARM_DESC(check_pci_errors, |
079708b9 | 734 | "Check for PCI bus parity errors: 0=off 1=on"); |
4de78c68 DJ |
735 | module_param(edac_pci_panic_on_pe, int, 0644); |
736 | MODULE_PARM_DESC(edac_pci_panic_on_pe, | |
079708b9 | 737 | "Panic on PCI Bus Parity error: 0=off 1=on"); |