| 1 | /* |
| 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> |
| 10 | #include <linux/edac.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/ctype.h> |
| 13 | |
| 14 | #include "edac_core.h" |
| 15 | #include "edac_module.h" |
| 16 | |
| 17 | /* Turn off this whole feature if PCI is not configured */ |
| 18 | #ifdef CONFIG_PCI |
| 19 | |
| 20 | #define EDAC_PCI_SYMLINK "device" |
| 21 | |
| 22 | /* data variables exported via sysfs */ |
| 23 | static int check_pci_errors; /* default NO check PCI parity */ |
| 24 | static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */ |
| 25 | static int edac_pci_log_pe = 1; /* log PCI parity errors */ |
| 26 | static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */ |
| 27 | static int edac_pci_poll_msec = 1000; /* one second workq period */ |
| 28 | |
| 29 | static atomic_t pci_parity_count = ATOMIC_INIT(0); |
| 30 | static atomic_t pci_nonparity_count = ATOMIC_INIT(0); |
| 31 | |
| 32 | static struct kobject *edac_pci_top_main_kobj; |
| 33 | static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0); |
| 34 | |
| 35 | /* getter functions for the data variables */ |
| 36 | int edac_pci_get_check_errors(void) |
| 37 | { |
| 38 | return check_pci_errors; |
| 39 | } |
| 40 | |
| 41 | static int edac_pci_get_log_pe(void) |
| 42 | { |
| 43 | return edac_pci_log_pe; |
| 44 | } |
| 45 | |
| 46 | static int edac_pci_get_log_npe(void) |
| 47 | { |
| 48 | return edac_pci_log_npe; |
| 49 | } |
| 50 | |
| 51 | static int edac_pci_get_panic_on_pe(void) |
| 52 | { |
| 53 | return edac_pci_panic_on_pe; |
| 54 | } |
| 55 | |
| 56 | int edac_pci_get_poll_msec(void) |
| 57 | { |
| 58 | return edac_pci_poll_msec; |
| 59 | } |
| 60 | |
| 61 | /**************************** EDAC PCI sysfs instance *******************/ |
| 62 | static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data) |
| 63 | { |
| 64 | return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count)); |
| 65 | } |
| 66 | |
| 67 | static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci, |
| 68 | char *data) |
| 69 | { |
| 70 | return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count)); |
| 71 | } |
| 72 | |
| 73 | #define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj) |
| 74 | #define to_instance_attr(a) container_of(a, struct instance_attribute, attr) |
| 75 | |
| 76 | /* DEVICE instance kobject release() function */ |
| 77 | static void edac_pci_instance_release(struct kobject *kobj) |
| 78 | { |
| 79 | struct edac_pci_ctl_info *pci; |
| 80 | |
| 81 | edac_dbg(0, "\n"); |
| 82 | |
| 83 | /* Form pointer to containing struct, the pci control struct */ |
| 84 | pci = to_instance(kobj); |
| 85 | |
| 86 | /* decrement reference count on top main kobj */ |
| 87 | kobject_put(edac_pci_top_main_kobj); |
| 88 | |
| 89 | kfree(pci); /* Free the control struct */ |
| 90 | } |
| 91 | |
| 92 | /* instance specific attribute structure */ |
| 93 | struct instance_attribute { |
| 94 | struct attribute attr; |
| 95 | ssize_t(*show) (struct edac_pci_ctl_info *, char *); |
| 96 | ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t); |
| 97 | }; |
| 98 | |
| 99 | /* Function to 'show' fields from the edac_pci 'instance' structure */ |
| 100 | static ssize_t edac_pci_instance_show(struct kobject *kobj, |
| 101 | struct attribute *attr, char *buffer) |
| 102 | { |
| 103 | struct edac_pci_ctl_info *pci = to_instance(kobj); |
| 104 | struct instance_attribute *instance_attr = to_instance_attr(attr); |
| 105 | |
| 106 | if (instance_attr->show) |
| 107 | return instance_attr->show(pci, buffer); |
| 108 | return -EIO; |
| 109 | } |
| 110 | |
| 111 | /* Function to 'store' fields into the edac_pci 'instance' structure */ |
| 112 | static ssize_t edac_pci_instance_store(struct kobject *kobj, |
| 113 | struct attribute *attr, |
| 114 | const char *buffer, size_t count) |
| 115 | { |
| 116 | struct edac_pci_ctl_info *pci = to_instance(kobj); |
| 117 | struct instance_attribute *instance_attr = to_instance_attr(attr); |
| 118 | |
| 119 | if (instance_attr->store) |
| 120 | return instance_attr->store(pci, buffer, count); |
| 121 | return -EIO; |
| 122 | } |
| 123 | |
| 124 | /* fs_ops table */ |
| 125 | static const struct sysfs_ops pci_instance_ops = { |
| 126 | .show = edac_pci_instance_show, |
| 127 | .store = edac_pci_instance_store |
| 128 | }; |
| 129 | |
| 130 | #define INSTANCE_ATTR(_name, _mode, _show, _store) \ |
| 131 | static struct instance_attribute attr_instance_##_name = { \ |
| 132 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
| 133 | .show = _show, \ |
| 134 | .store = _store, \ |
| 135 | }; |
| 136 | |
| 137 | INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL); |
| 138 | INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL); |
| 139 | |
| 140 | /* pci instance attributes */ |
| 141 | static struct instance_attribute *pci_instance_attr[] = { |
| 142 | &attr_instance_pe_count, |
| 143 | &attr_instance_npe_count, |
| 144 | NULL |
| 145 | }; |
| 146 | |
| 147 | /* the ktype for a pci instance */ |
| 148 | static struct kobj_type ktype_pci_instance = { |
| 149 | .release = edac_pci_instance_release, |
| 150 | .sysfs_ops = &pci_instance_ops, |
| 151 | .default_attrs = (struct attribute **)pci_instance_attr, |
| 152 | }; |
| 153 | |
| 154 | /* |
| 155 | * edac_pci_create_instance_kobj |
| 156 | * |
| 157 | * construct one EDAC PCI instance's kobject for use |
| 158 | */ |
| 159 | static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx) |
| 160 | { |
| 161 | struct kobject *main_kobj; |
| 162 | int err; |
| 163 | |
| 164 | edac_dbg(0, "\n"); |
| 165 | |
| 166 | /* First bump the ref count on the top main kobj, which will |
| 167 | * track the number of PCI instances we have, and thus nest |
| 168 | * properly on keeping the module loaded |
| 169 | */ |
| 170 | main_kobj = kobject_get(edac_pci_top_main_kobj); |
| 171 | if (!main_kobj) { |
| 172 | err = -ENODEV; |
| 173 | goto error_out; |
| 174 | } |
| 175 | |
| 176 | /* And now register this new kobject under the main kobj */ |
| 177 | err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance, |
| 178 | edac_pci_top_main_kobj, "pci%d", idx); |
| 179 | if (err != 0) { |
| 180 | edac_dbg(2, "failed to register instance pci%d\n", idx); |
| 181 | kobject_put(edac_pci_top_main_kobj); |
| 182 | goto error_out; |
| 183 | } |
| 184 | |
| 185 | kobject_uevent(&pci->kobj, KOBJ_ADD); |
| 186 | edac_dbg(1, "Register instance 'pci%d' kobject\n", idx); |
| 187 | |
| 188 | return 0; |
| 189 | |
| 190 | /* Error unwind statck */ |
| 191 | error_out: |
| 192 | return err; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * edac_pci_unregister_sysfs_instance_kobj |
| 197 | * |
| 198 | * unregister the kobj for the EDAC PCI instance |
| 199 | */ |
| 200 | static void edac_pci_unregister_sysfs_instance_kobj( |
| 201 | struct edac_pci_ctl_info *pci) |
| 202 | { |
| 203 | edac_dbg(0, "\n"); |
| 204 | |
| 205 | /* Unregister the instance kobject and allow its release |
| 206 | * function release the main reference count and then |
| 207 | * kfree the memory |
| 208 | */ |
| 209 | kobject_put(&pci->kobj); |
| 210 | } |
| 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) |
| 215 | |
| 216 | /* simple show/store functions for attributes */ |
| 217 | static ssize_t edac_pci_int_show(void *ptr, char *buffer) |
| 218 | { |
| 219 | int *value = ptr; |
| 220 | return sprintf(buffer, "%d\n", *value); |
| 221 | } |
| 222 | |
| 223 | static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count) |
| 224 | { |
| 225 | int *value = ptr; |
| 226 | |
| 227 | if (isdigit(*buffer)) |
| 228 | *value = simple_strtoul(buffer, NULL, 0); |
| 229 | |
| 230 | return count; |
| 231 | } |
| 232 | |
| 233 | struct edac_pci_dev_attribute { |
| 234 | struct attribute attr; |
| 235 | void *value; |
| 236 | ssize_t(*show) (void *, char *); |
| 237 | ssize_t(*store) (void *, const char *, size_t); |
| 238 | }; |
| 239 | |
| 240 | /* Set of show/store abstract level functions for PCI Parity object */ |
| 241 | static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr, |
| 242 | char *buffer) |
| 243 | { |
| 244 | struct edac_pci_dev_attribute *edac_pci_dev; |
| 245 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
| 246 | |
| 247 | if (edac_pci_dev->show) |
| 248 | return edac_pci_dev->show(edac_pci_dev->value, buffer); |
| 249 | return -EIO; |
| 250 | } |
| 251 | |
| 252 | static ssize_t edac_pci_dev_store(struct kobject *kobj, |
| 253 | struct attribute *attr, const char *buffer, |
| 254 | size_t count) |
| 255 | { |
| 256 | struct edac_pci_dev_attribute *edac_pci_dev; |
| 257 | edac_pci_dev = (struct edac_pci_dev_attribute *)attr; |
| 258 | |
| 259 | if (edac_pci_dev->store) |
| 260 | return edac_pci_dev->store(edac_pci_dev->value, buffer, count); |
| 261 | return -EIO; |
| 262 | } |
| 263 | |
| 264 | static const struct sysfs_ops edac_pci_sysfs_ops = { |
| 265 | .show = edac_pci_dev_show, |
| 266 | .store = edac_pci_dev_store |
| 267 | }; |
| 268 | |
| 269 | #define EDAC_PCI_ATTR(_name,_mode,_show,_store) \ |
| 270 | static 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) \ |
| 278 | static 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 */ |
| 286 | EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show, |
| 287 | edac_pci_int_store); |
| 288 | EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
| 289 | edac_pci_int_store); |
| 290 | EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
| 291 | edac_pci_int_store); |
| 292 | EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, |
| 293 | edac_pci_int_store); |
| 294 | EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL); |
| 295 | EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL); |
| 296 | |
| 297 | /* Base Attributes of the memory ECC object */ |
| 298 | static struct edac_pci_dev_attribute *edac_pci_attr[] = { |
| 299 | &edac_pci_attr_check_pci_errors, |
| 300 | &edac_pci_attr_edac_pci_log_pe, |
| 301 | &edac_pci_attr_edac_pci_log_npe, |
| 302 | &edac_pci_attr_edac_pci_panic_on_pe, |
| 303 | &edac_pci_attr_pci_parity_count, |
| 304 | &edac_pci_attr_pci_nonparity_count, |
| 305 | NULL, |
| 306 | }; |
| 307 | |
| 308 | /* |
| 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 | */ |
| 317 | static void edac_pci_release_main_kobj(struct kobject *kobj) |
| 318 | { |
| 319 | edac_dbg(0, "here to module_put(THIS_MODULE)\n"); |
| 320 | |
| 321 | kfree(kobj); |
| 322 | |
| 323 | /* 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); |
| 327 | } |
| 328 | |
| 329 | /* ktype struct for the EDAC PCI main kobj */ |
| 330 | static struct kobj_type ktype_edac_pci_main_kobj = { |
| 331 | .release = edac_pci_release_main_kobj, |
| 332 | .sysfs_ops = &edac_pci_sysfs_ops, |
| 333 | .default_attrs = (struct attribute **)edac_pci_attr, |
| 334 | }; |
| 335 | |
| 336 | /** |
| 337 | * edac_pci_main_kobj_setup() |
| 338 | * |
| 339 | * setup the sysfs for EDAC PCI attributes |
| 340 | * assumes edac_subsys has already been initialized |
| 341 | */ |
| 342 | static int edac_pci_main_kobj_setup(void) |
| 343 | { |
| 344 | int err; |
| 345 | struct bus_type *edac_subsys; |
| 346 | |
| 347 | edac_dbg(0, "\n"); |
| 348 | |
| 349 | /* 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 attributes |
| 355 | */ |
| 356 | edac_subsys = edac_get_sysfs_subsys(); |
| 357 | if (edac_subsys == NULL) { |
| 358 | edac_dbg(1, "no edac_subsys\n"); |
| 359 | err = -ENODEV; |
| 360 | goto decrement_count_fail; |
| 361 | } |
| 362 | |
| 363 | /* 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 | edac_dbg(1, "try_module_get() failed\n"); |
| 369 | err = -ENODEV; |
| 370 | goto mod_get_fail; |
| 371 | } |
| 372 | |
| 373 | edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); |
| 374 | if (!edac_pci_top_main_kobj) { |
| 375 | edac_dbg(1, "Failed to allocate\n"); |
| 376 | err = -ENOMEM; |
| 377 | goto kzalloc_fail; |
| 378 | } |
| 379 | |
| 380 | /* Instanstiate the pci object */ |
| 381 | err = kobject_init_and_add(edac_pci_top_main_kobj, |
| 382 | &ktype_edac_pci_main_kobj, |
| 383 | &edac_subsys->dev_root->kobj, "pci"); |
| 384 | if (err) { |
| 385 | edac_dbg(1, "Failed to register '.../edac/pci'\n"); |
| 386 | goto kobject_init_and_add_fail; |
| 387 | } |
| 388 | |
| 389 | /* 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 | */ |
| 393 | kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD); |
| 394 | edac_dbg(1, "Registered '.../edac/pci' kobject\n"); |
| 395 | |
| 396 | return 0; |
| 397 | |
| 398 | /* Error unwind statck */ |
| 399 | kobject_init_and_add_fail: |
| 400 | kfree(edac_pci_top_main_kobj); |
| 401 | |
| 402 | kzalloc_fail: |
| 403 | module_put(THIS_MODULE); |
| 404 | |
| 405 | mod_get_fail: |
| 406 | edac_put_sysfs_subsys(); |
| 407 | |
| 408 | decrement_count_fail: |
| 409 | /* if are on this error exit, nothing to tear down */ |
| 410 | atomic_dec(&edac_pci_sysfs_refcount); |
| 411 | |
| 412 | return err; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * edac_pci_main_kobj_teardown() |
| 417 | * |
| 418 | * if no longer linked (needed) remove the top level EDAC PCI |
| 419 | * kobject with its controls and attributes |
| 420 | */ |
| 421 | static void edac_pci_main_kobj_teardown(void) |
| 422 | { |
| 423 | edac_dbg(0, "\n"); |
| 424 | |
| 425 | /* Decrement the count and only if no more controller instances |
| 426 | * are connected perform the unregisteration of the top level |
| 427 | * main kobj |
| 428 | */ |
| 429 | if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) { |
| 430 | edac_dbg(0, "called kobject_put on main kobj\n"); |
| 431 | kobject_put(edac_pci_top_main_kobj); |
| 432 | edac_put_sysfs_subsys(); |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * |
| 438 | * edac_pci_create_sysfs |
| 439 | * |
| 440 | * Create the controls/attributes for the specified EDAC PCI device |
| 441 | */ |
| 442 | int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci) |
| 443 | { |
| 444 | int err; |
| 445 | struct kobject *edac_kobj = &pci->kobj; |
| 446 | |
| 447 | edac_dbg(0, "idx=%d\n", pci->pci_idx); |
| 448 | |
| 449 | /* create the top main EDAC PCI kobject, IF needed */ |
| 450 | err = edac_pci_main_kobj_setup(); |
| 451 | if (err) |
| 452 | return err; |
| 453 | |
| 454 | /* Create this instance's kobject under the MAIN kobject */ |
| 455 | err = edac_pci_create_instance_kobj(pci, pci->pci_idx); |
| 456 | if (err) |
| 457 | goto unregister_cleanup; |
| 458 | |
| 459 | err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK); |
| 460 | if (err) { |
| 461 | edac_dbg(0, "sysfs_create_link() returned err= %d\n", err); |
| 462 | goto symlink_fail; |
| 463 | } |
| 464 | |
| 465 | return 0; |
| 466 | |
| 467 | /* Error unwind stack */ |
| 468 | symlink_fail: |
| 469 | edac_pci_unregister_sysfs_instance_kobj(pci); |
| 470 | |
| 471 | unregister_cleanup: |
| 472 | edac_pci_main_kobj_teardown(); |
| 473 | |
| 474 | return err; |
| 475 | } |
| 476 | |
| 477 | /* |
| 478 | * edac_pci_remove_sysfs |
| 479 | * |
| 480 | * remove the controls and attributes for this EDAC PCI device |
| 481 | */ |
| 482 | void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci) |
| 483 | { |
| 484 | edac_dbg(0, "index=%d\n", pci->pci_idx); |
| 485 | |
| 486 | /* Remove the symlink */ |
| 487 | sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK); |
| 488 | |
| 489 | /* remove this PCI instance's sysfs entries */ |
| 490 | edac_pci_unregister_sysfs_instance_kobj(pci); |
| 491 | |
| 492 | /* Call the main unregister function, which will determine |
| 493 | * if this 'pci' is the last instance. |
| 494 | * If it is, the main kobject will be unregistered as a result |
| 495 | */ |
| 496 | edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n"); |
| 497 | edac_pci_main_kobj_teardown(); |
| 498 | } |
| 499 | |
| 500 | /************************ PCI error handling *************************/ |
| 501 | static u16 get_pci_parity_status(struct pci_dev *dev, int secondary) |
| 502 | { |
| 503 | int where; |
| 504 | u16 status; |
| 505 | |
| 506 | where = secondary ? PCI_SEC_STATUS : PCI_STATUS; |
| 507 | pci_read_config_word(dev, where, &status); |
| 508 | |
| 509 | /* If we get back 0xFFFF then we must suspect that the card has been |
| 510 | * pulled but the Linux PCI layer has not yet finished cleaning up. |
| 511 | * We don't want to report on such devices |
| 512 | */ |
| 513 | |
| 514 | if (status == 0xFFFF) { |
| 515 | u32 sanity; |
| 516 | |
| 517 | pci_read_config_dword(dev, 0, &sanity); |
| 518 | |
| 519 | if (sanity == 0xFFFFFFFF) |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | |
| 524 | PCI_STATUS_PARITY; |
| 525 | |
| 526 | if (status) |
| 527 | /* reset only the bits we are interested in */ |
| 528 | pci_write_config_word(dev, where, status); |
| 529 | |
| 530 | return status; |
| 531 | } |
| 532 | |
| 533 | |
| 534 | /* Clear any PCI parity errors logged by this device. */ |
| 535 | static void edac_pci_dev_parity_clear(struct pci_dev *dev) |
| 536 | { |
| 537 | u8 header_type; |
| 538 | |
| 539 | 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 | * |
| 551 | * Function to retrieve the current parity status |
| 552 | * and decode it |
| 553 | * |
| 554 | */ |
| 555 | static void edac_pci_dev_parity_test(struct pci_dev *dev) |
| 556 | { |
| 557 | unsigned long flags; |
| 558 | u16 status; |
| 559 | u8 header_type; |
| 560 | |
| 561 | /* stop any interrupts until we can acquire the status */ |
| 562 | local_irq_save(flags); |
| 563 | |
| 564 | /* read the STATUS register on this device */ |
| 565 | status = get_pci_parity_status(dev, 0); |
| 566 | |
| 567 | /* 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 | |
| 572 | edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev)); |
| 573 | |
| 574 | /* 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) { |
| 578 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
| 579 | edac_printk(KERN_CRIT, EDAC_PCI, |
| 580 | "Signaled System Error on %s\n", |
| 581 | pci_name(dev)); |
| 582 | atomic_inc(&pci_nonparity_count); |
| 583 | } |
| 584 | |
| 585 | if (status & (PCI_STATUS_PARITY)) { |
| 586 | edac_printk(KERN_CRIT, EDAC_PCI, |
| 587 | "Master Data Parity Error on %s\n", |
| 588 | pci_name(dev)); |
| 589 | |
| 590 | atomic_inc(&pci_parity_count); |
| 591 | } |
| 592 | |
| 593 | if (status & (PCI_STATUS_DETECTED_PARITY)) { |
| 594 | edac_printk(KERN_CRIT, EDAC_PCI, |
| 595 | "Detected Parity Error on %s\n", |
| 596 | pci_name(dev)); |
| 597 | |
| 598 | atomic_inc(&pci_parity_count); |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | |
| 603 | edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n", |
| 604 | header_type, dev_name(&dev->dev)); |
| 605 | |
| 606 | if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { |
| 607 | /* On bridges, need to examine secondary status register */ |
| 608 | status = get_pci_parity_status(dev, 1); |
| 609 | |
| 610 | edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n", |
| 611 | status, dev_name(&dev->dev)); |
| 612 | |
| 613 | /* check the secondary status reg for errors, |
| 614 | * on NOT broken boards |
| 615 | */ |
| 616 | if (status && !dev->broken_parity_status) { |
| 617 | if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { |
| 618 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " |
| 619 | "Signaled System Error on %s\n", |
| 620 | pci_name(dev)); |
| 621 | atomic_inc(&pci_nonparity_count); |
| 622 | } |
| 623 | |
| 624 | if (status & (PCI_STATUS_PARITY)) { |
| 625 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " |
| 626 | "Master Data Parity Error on " |
| 627 | "%s\n", pci_name(dev)); |
| 628 | |
| 629 | atomic_inc(&pci_parity_count); |
| 630 | } |
| 631 | |
| 632 | if (status & (PCI_STATUS_DETECTED_PARITY)) { |
| 633 | edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " |
| 634 | "Detected Parity Error on %s\n", |
| 635 | pci_name(dev)); |
| 636 | |
| 637 | atomic_inc(&pci_parity_count); |
| 638 | } |
| 639 | } |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | /* reduce some complexity in definition of the iterator */ |
| 644 | typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev); |
| 645 | |
| 646 | /* |
| 647 | * pci_dev parity list iterator |
| 648 | * |
| 649 | * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or |
| 650 | * Parity ERRORs on primary or secondary devices. |
| 651 | */ |
| 652 | static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn) |
| 653 | { |
| 654 | struct pci_dev *dev = NULL; |
| 655 | |
| 656 | for_each_pci_dev(dev) |
| 657 | fn(dev); |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * edac_pci_do_parity_check |
| 662 | * |
| 663 | * performs the actual PCI parity check operation |
| 664 | */ |
| 665 | void edac_pci_do_parity_check(void) |
| 666 | { |
| 667 | int before_count; |
| 668 | |
| 669 | edac_dbg(3, "\n"); |
| 670 | |
| 671 | /* if policy has PCI check off, leave now */ |
| 672 | if (!check_pci_errors) |
| 673 | return; |
| 674 | |
| 675 | before_count = atomic_read(&pci_parity_count); |
| 676 | |
| 677 | /* scan all PCI devices looking for a Parity Error on devices and |
| 678 | * bridges. |
| 679 | * The iterator calls pci_get_device() which might sleep, thus |
| 680 | * we cannot disable interrupts in this scan. |
| 681 | */ |
| 682 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_test); |
| 683 | |
| 684 | /* Only if operator has selected panic on PCI Error */ |
| 685 | if (edac_pci_get_panic_on_pe()) { |
| 686 | /* If the count is different 'after' from 'before' */ |
| 687 | if (before_count != atomic_read(&pci_parity_count)) |
| 688 | panic("EDAC: PCI Parity Error"); |
| 689 | } |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * edac_pci_clear_parity_errors |
| 694 | * |
| 695 | * function to perform an iteration over the PCI devices |
| 696 | * and clearn their current status |
| 697 | */ |
| 698 | void edac_pci_clear_parity_errors(void) |
| 699 | { |
| 700 | /* Clear any PCI bus parity errors that devices initially have logged |
| 701 | * in their registers. |
| 702 | */ |
| 703 | edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear); |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * edac_pci_handle_pe |
| 708 | * |
| 709 | * Called to handle a PARITY ERROR event |
| 710 | */ |
| 711 | void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg) |
| 712 | { |
| 713 | |
| 714 | /* global PE counter incremented by edac_pci_do_parity_check() */ |
| 715 | atomic_inc(&pci->counters.pe_count); |
| 716 | |
| 717 | if (edac_pci_get_log_pe()) |
| 718 | edac_pci_printk(pci, KERN_WARNING, |
| 719 | "Parity Error ctl: %s %d: %s\n", |
| 720 | pci->ctl_name, pci->pci_idx, msg); |
| 721 | |
| 722 | /* |
| 723 | * poke all PCI devices and see which one is the troublemaker |
| 724 | * panic() is called if set |
| 725 | */ |
| 726 | edac_pci_do_parity_check(); |
| 727 | } |
| 728 | EXPORT_SYMBOL_GPL(edac_pci_handle_pe); |
| 729 | |
| 730 | |
| 731 | /* |
| 732 | * edac_pci_handle_npe |
| 733 | * |
| 734 | * Called to handle a NON-PARITY ERROR event |
| 735 | */ |
| 736 | void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg) |
| 737 | { |
| 738 | |
| 739 | /* global NPE counter incremented by edac_pci_do_parity_check() */ |
| 740 | atomic_inc(&pci->counters.npe_count); |
| 741 | |
| 742 | if (edac_pci_get_log_npe()) |
| 743 | edac_pci_printk(pci, KERN_WARNING, |
| 744 | "Non-Parity Error ctl: %s %d: %s\n", |
| 745 | pci->ctl_name, pci->pci_idx, msg); |
| 746 | |
| 747 | /* |
| 748 | * poke all PCI devices and see which one is the troublemaker |
| 749 | * panic() is called if set |
| 750 | */ |
| 751 | edac_pci_do_parity_check(); |
| 752 | } |
| 753 | EXPORT_SYMBOL_GPL(edac_pci_handle_npe); |
| 754 | |
| 755 | /* |
| 756 | * Define the PCI parameter to the module |
| 757 | */ |
| 758 | module_param(check_pci_errors, int, 0644); |
| 759 | MODULE_PARM_DESC(check_pci_errors, |
| 760 | "Check for PCI bus parity errors: 0=off 1=on"); |
| 761 | module_param(edac_pci_panic_on_pe, int, 0644); |
| 762 | MODULE_PARM_DESC(edac_pci_panic_on_pe, |
| 763 | "Panic on PCI Bus Parity error: 0=off 1=on"); |
| 764 | |
| 765 | #endif /* CONFIG_PCI */ |