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#define EDAC_PCI_SYMLINK "device" 18 19/* data variables exported via sysfs */ 20static int check_pci_errors; /* default NO check PCI parity */ 21static int edac_pci_panic_on_pe; /* default NO panic on PCI Parity */ 22static int edac_pci_log_pe = 1; /* log PCI parity errors */ 23static int edac_pci_log_npe = 1; /* log PCI non-parity error errors */ 24static int edac_pci_poll_msec = 1000; /* one second workq period */ 25 26static atomic_t pci_parity_count = ATOMIC_INIT(0); 27static atomic_t pci_nonparity_count = ATOMIC_INIT(0); 28 29static struct kobject *edac_pci_top_main_kobj; 30static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0); 31 32/* getter functions for the data variables */ 33int edac_pci_get_check_errors(void) 34{ 35 return check_pci_errors; 36} 37 38static int edac_pci_get_log_pe(void) 39{ 40 return edac_pci_log_pe; 41} 42 43static int edac_pci_get_log_npe(void) 44{ 45 return edac_pci_log_npe; 46} 47 48static int edac_pci_get_panic_on_pe(void) 49{ 50 return edac_pci_panic_on_pe; 51} 52 53int edac_pci_get_poll_msec(void) 54{ 55 return edac_pci_poll_msec; 56} 57 58/**************************** EDAC PCI sysfs instance *******************/ 59static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data) 60{ 61 return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count)); 62} 63 64static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci, 65 char *data) 66{ 67 return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count)); 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 */ 74static void edac_pci_instance_release(struct kobject *kobj) 75{ 76 struct edac_pci_ctl_info *pci; 77 78 edac_dbg(0, "\n"); 79 80 /* Form pointer to containing struct, the pci control struct */ 81 pci = to_instance(kobj); 82 83 /* decrement reference count on top main kobj */ 84 kobject_put(edac_pci_top_main_kobj); 85 86 kfree(pci); /* Free the control struct */ 87} 88 89/* instance specific attribute structure */ 90struct instance_attribute { 91 struct attribute attr; 92 ssize_t(*show) (struct edac_pci_ctl_info *, char *); 93 ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t); 94}; 95 96/* Function to 'show' fields from the edac_pci 'instance' structure */ 97static ssize_t edac_pci_instance_show(struct kobject *kobj, 98 struct attribute *attr, char *buffer) 99{ 100 struct edac_pci_ctl_info *pci = to_instance(kobj); 101 struct instance_attribute *instance_attr = to_instance_attr(attr); 102 103 if (instance_attr->show) 104 return instance_attr->show(pci, buffer); 105 return -EIO; 106} 107 108/* Function to 'store' fields into the edac_pci 'instance' structure */ 109static ssize_t edac_pci_instance_store(struct kobject *kobj, 110 struct attribute *attr, 111 const char *buffer, size_t count) 112{ 113 struct edac_pci_ctl_info *pci = to_instance(kobj); 114 struct instance_attribute *instance_attr = to_instance_attr(attr); 115 116 if (instance_attr->store) 117 return instance_attr->store(pci, buffer, count); 118 return -EIO; 119} 120 121/* fs_ops table */ 122static const struct sysfs_ops pci_instance_ops = { 123 .show = edac_pci_instance_show, 124 .store = edac_pci_instance_store 125}; 126 127#define INSTANCE_ATTR(_name, _mode, _show, _store) \ 128static struct instance_attribute attr_instance_##_name = { \ 129 .attr = {.name = __stringify(_name), .mode = _mode }, \ 130 .show = _show, \ 131 .store = _store, \ 132}; 133 134INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL); 135INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL); 136 137/* pci instance attributes */ 138static struct instance_attribute *pci_instance_attr[] = { 139 &attr_instance_pe_count, 140 &attr_instance_npe_count, 141 NULL 142}; 143 144/* the ktype for a pci instance */ 145static 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}; 150 151/* 152 * edac_pci_create_instance_kobj 153 * 154 * construct one EDAC PCI instance's kobject for use 155 */ 156static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx) 157{ 158 struct kobject *main_kobj; 159 int err; 160 161 edac_dbg(0, "\n"); 162 163 /* 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 */ 167 main_kobj = kobject_get(edac_pci_top_main_kobj); 168 if (!main_kobj) { 169 err = -ENODEV; 170 goto error_out; 171 } 172 173 /* And now register this new kobject under the main kobj */ 174 err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance, 175 edac_pci_top_main_kobj, "pci%d", idx); 176 if (err != 0) { 177 edac_dbg(2, "failed to register instance pci%d\n", idx); 178 kobject_put(edac_pci_top_main_kobj); 179 goto error_out; 180 } 181 182 kobject_uevent(&pci->kobj, KOBJ_ADD); 183 edac_dbg(1, "Register instance 'pci%d' kobject\n", idx); 184 185 return 0; 186 187 /* Error unwind statck */ 188error_out: 189 return err; 190} 191 192/* 193 * edac_pci_unregister_sysfs_instance_kobj 194 * 195 * unregister the kobj for the EDAC PCI instance 196 */ 197static void edac_pci_unregister_sysfs_instance_kobj( 198 struct edac_pci_ctl_info *pci) 199{ 200 edac_dbg(0, "\n"); 201 202 /* Unregister the instance kobject and allow its release 203 * function release the main reference count and then 204 * kfree the memory 205 */ 206 kobject_put(&pci->kobj); 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) 212 213/* simple show/store functions for attributes */ 214static ssize_t edac_pci_int_show(void *ptr, char *buffer) 215{ 216 int *value = ptr; 217 return sprintf(buffer, "%d\n", *value); 218} 219 220static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count) 221{ 222 int *value = ptr; 223 224 if (isdigit(*buffer)) 225 *value = simple_strtoul(buffer, NULL, 0); 226 227 return count; 228} 229 230struct edac_pci_dev_attribute { 231 struct attribute attr; 232 void *value; 233 ssize_t(*show) (void *, char *); 234 ssize_t(*store) (void *, const char *, size_t); 235}; 236 237/* Set of show/store abstract level functions for PCI Parity object */ 238static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr, 239 char *buffer) 240{ 241 struct edac_pci_dev_attribute *edac_pci_dev; 242 edac_pci_dev = (struct edac_pci_dev_attribute *)attr; 243 244 if (edac_pci_dev->show) 245 return edac_pci_dev->show(edac_pci_dev->value, buffer); 246 return -EIO; 247} 248 249static ssize_t edac_pci_dev_store(struct kobject *kobj, 250 struct attribute *attr, const char *buffer, 251 size_t count) 252{ 253 struct edac_pci_dev_attribute *edac_pci_dev; 254 edac_pci_dev = (struct edac_pci_dev_attribute *)attr; 255 256 if (edac_pci_dev->store) 257 return edac_pci_dev->store(edac_pci_dev->value, buffer, count); 258 return -EIO; 259} 260 261static const struct sysfs_ops edac_pci_sysfs_ops = { 262 .show = edac_pci_dev_show, 263 .store = edac_pci_dev_store 264}; 265 266#define EDAC_PCI_ATTR(_name,_mode,_show,_store) \ 267static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ 268 .attr = {.name = __stringify(_name), .mode = _mode }, \ 269 .value = &_name, \ 270 .show = _show, \ 271 .store = _store, \ 272}; 273 274#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store) \ 275static struct edac_pci_dev_attribute edac_pci_attr_##_name = { \ 276 .attr = {.name = __stringify(_name), .mode = _mode }, \ 277 .value = _data, \ 278 .show = _show, \ 279 .store = _store, \ 280}; 281 282/* PCI Parity control files */ 283EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show, 284 edac_pci_int_store); 285EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, 286 edac_pci_int_store); 287EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show, 288 edac_pci_int_store); 289EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show, 290 edac_pci_int_store); 291EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL); 292EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL); 293 294/* Base Attributes of the memory ECC object */ 295static struct edac_pci_dev_attribute *edac_pci_attr[] = { 296 &edac_pci_attr_check_pci_errors, 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, 300 &edac_pci_attr_pci_parity_count, 301 &edac_pci_attr_pci_nonparity_count, 302 NULL, 303}; 304 305/* 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 */ 314static void edac_pci_release_main_kobj(struct kobject *kobj) 315{ 316 edac_dbg(0, "here to module_put(THIS_MODULE)\n"); 317 318 kfree(kobj); 319 320 /* 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); 324} 325 326/* ktype struct for the EDAC PCI main kobj */ 327static struct kobj_type ktype_edac_pci_main_kobj = { 328 .release = edac_pci_release_main_kobj, 329 .sysfs_ops = &edac_pci_sysfs_ops, 330 .default_attrs = (struct attribute **)edac_pci_attr, 331}; 332 333/** 334 * edac_pci_main_kobj_setup() 335 * 336 * setup the sysfs for EDAC PCI attributes 337 * assumes edac_subsys has already been initialized 338 */ 339static int edac_pci_main_kobj_setup(void) 340{ 341 int err; 342 struct bus_type *edac_subsys; 343 344 edac_dbg(0, "\n"); 345 346 /* check and count if we have already created the main kobject */ 347 if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1) 348 return 0; 349 350 /* First time, so create the main kobject and its 351 * controls and attributes 352 */ 353 edac_subsys = edac_get_sysfs_subsys(); 354 if (edac_subsys == NULL) { 355 edac_dbg(1, "no edac_subsys\n"); 356 err = -ENODEV; 357 goto decrement_count_fail; 358 } 359 360 /* Bump the reference count on this module to ensure the 361 * modules isn't unloaded until we deconstruct the top 362 * level main kobj for EDAC PCI 363 */ 364 if (!try_module_get(THIS_MODULE)) { 365 edac_dbg(1, "try_module_get() failed\n"); 366 err = -ENODEV; 367 goto mod_get_fail; 368 } 369 370 edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); 371 if (!edac_pci_top_main_kobj) { 372 edac_dbg(1, "Failed to allocate\n"); 373 err = -ENOMEM; 374 goto kzalloc_fail; 375 } 376 377 /* Instanstiate the pci object */ 378 err = kobject_init_and_add(edac_pci_top_main_kobj, 379 &ktype_edac_pci_main_kobj, 380 &edac_subsys->dev_root->kobj, "pci"); 381 if (err) { 382 edac_dbg(1, "Failed to register '.../edac/pci'\n"); 383 goto kobject_init_and_add_fail; 384 } 385 386 /* At this point, to 'release' the top level kobject 387 * for EDAC PCI, then edac_pci_main_kobj_teardown() 388 * must be used, for resources to be cleaned up properly 389 */ 390 kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD); 391 edac_dbg(1, "Registered '.../edac/pci' kobject\n"); 392 393 return 0; 394 395 /* Error unwind statck */ 396kobject_init_and_add_fail: 397 kfree(edac_pci_top_main_kobj); 398 399kzalloc_fail: 400 module_put(THIS_MODULE); 401 402mod_get_fail: 403 edac_put_sysfs_subsys(); 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; 410} 411 412/* 413 * edac_pci_main_kobj_teardown() 414 * 415 * if no longer linked (needed) remove the top level EDAC PCI 416 * kobject with its controls and attributes 417 */ 418static void edac_pci_main_kobj_teardown(void) 419{ 420 edac_dbg(0, "\n"); 421 422 /* 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) { 427 edac_dbg(0, "called kobject_put on main kobj\n"); 428 kobject_put(edac_pci_top_main_kobj); 429 edac_put_sysfs_subsys(); 430 } 431} 432 433/* 434 * 435 * edac_pci_create_sysfs 436 * 437 * Create the controls/attributes for the specified EDAC PCI device 438 */ 439int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci) 440{ 441 int err; 442 struct kobject *edac_kobj = &pci->kobj; 443 444 edac_dbg(0, "idx=%d\n", pci->pci_idx); 445 446 /* 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; 455 456 err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK); 457 if (err) { 458 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err); 459 goto symlink_fail; 460 } 461 462 return 0; 463 464 /* Error unwind stack */ 465symlink_fail: 466 edac_pci_unregister_sysfs_instance_kobj(pci); 467 468unregister_cleanup: 469 edac_pci_main_kobj_teardown(); 470 471 return err; 472} 473 474/* 475 * edac_pci_remove_sysfs 476 * 477 * remove the controls and attributes for this EDAC PCI device 478 */ 479void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci) 480{ 481 edac_dbg(0, "index=%d\n", pci->pci_idx); 482 483 /* Remove the symlink */ 484 sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK); 485 486 /* remove this PCI instance's sysfs entries */ 487 edac_pci_unregister_sysfs_instance_kobj(pci); 488 489 /* Call the main unregister function, which will determine 490 * if this 'pci' is the last instance. 491 * If it is, the main kobject will be unregistered as a result 492 */ 493 edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n"); 494 edac_pci_main_kobj_teardown(); 495} 496 497/************************ PCI error handling *************************/ 498static u16 get_pci_parity_status(struct pci_dev *dev, int secondary) 499{ 500 int where; 501 u16 status; 502 503 where = secondary ? PCI_SEC_STATUS : PCI_STATUS; 504 pci_read_config_word(dev, where, &status); 505 506 /* If we get back 0xFFFF then we must suspect that the card has been 507 * pulled but the Linux PCI layer has not yet finished cleaning up. 508 * We don't want to report on such devices 509 */ 510 511 if (status == 0xFFFF) { 512 u32 sanity; 513 514 pci_read_config_dword(dev, 0, &sanity); 515 516 if (sanity == 0xFFFFFFFF) 517 return 0; 518 } 519 520 status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | 521 PCI_STATUS_PARITY; 522 523 if (status) 524 /* reset only the bits we are interested in */ 525 pci_write_config_word(dev, where, status); 526 527 return status; 528} 529 530 531/* Clear any PCI parity errors logged by this device. */ 532static void edac_pci_dev_parity_clear(struct pci_dev *dev) 533{ 534 u8 header_type; 535 536 get_pci_parity_status(dev, 0); 537 538 /* read the device TYPE, looking for bridges */ 539 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); 540 541 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) 542 get_pci_parity_status(dev, 1); 543} 544 545/* 546 * PCI Parity polling 547 * 548 * Function to retrieve the current parity status 549 * and decode it 550 * 551 */ 552static void edac_pci_dev_parity_test(struct pci_dev *dev) 553{ 554 unsigned long flags; 555 u16 status; 556 u8 header_type; 557 558 /* stop any interrupts until we can acquire the status */ 559 local_irq_save(flags); 560 561 /* read the STATUS register on this device */ 562 status = get_pci_parity_status(dev, 0); 563 564 /* read the device TYPE, looking for bridges */ 565 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); 566 567 local_irq_restore(flags); 568 569 edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev)); 570 571 /* check the status reg for errors on boards NOT marked as broken 572 * if broken, we cannot trust any of the status bits 573 */ 574 if (status && !dev->broken_parity_status) { 575 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { 576 edac_printk(KERN_CRIT, EDAC_PCI, 577 "Signaled System Error on %s\n", 578 pci_name(dev)); 579 atomic_inc(&pci_nonparity_count); 580 } 581 582 if (status & (PCI_STATUS_PARITY)) { 583 edac_printk(KERN_CRIT, EDAC_PCI, 584 "Master Data Parity Error on %s\n", 585 pci_name(dev)); 586 587 atomic_inc(&pci_parity_count); 588 } 589 590 if (status & (PCI_STATUS_DETECTED_PARITY)) { 591 edac_printk(KERN_CRIT, EDAC_PCI, 592 "Detected Parity Error on %s\n", 593 pci_name(dev)); 594 595 atomic_inc(&pci_parity_count); 596 } 597 } 598 599 600 edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n", 601 header_type, dev_name(&dev->dev)); 602 603 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { 604 /* On bridges, need to examine secondary status register */ 605 status = get_pci_parity_status(dev, 1); 606 607 edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n", 608 status, dev_name(&dev->dev)); 609 610 /* check the secondary status reg for errors, 611 * on NOT broken boards 612 */ 613 if (status && !dev->broken_parity_status) { 614 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { 615 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " 616 "Signaled System Error on %s\n", 617 pci_name(dev)); 618 atomic_inc(&pci_nonparity_count); 619 } 620 621 if (status & (PCI_STATUS_PARITY)) { 622 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " 623 "Master Data Parity Error on " 624 "%s\n", pci_name(dev)); 625 626 atomic_inc(&pci_parity_count); 627 } 628 629 if (status & (PCI_STATUS_DETECTED_PARITY)) { 630 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " 631 "Detected Parity Error on %s\n", 632 pci_name(dev)); 633 634 atomic_inc(&pci_parity_count); 635 } 636 } 637 } 638} 639 640/* reduce some complexity in definition of the iterator */ 641typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev); 642 643/* 644 * pci_dev parity list iterator 645 * 646 * Scan the PCI device list looking for SERRORs, Master Parity ERRORS or 647 * 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 for_each_pci_dev(dev) 654 fn(dev); 655} 656 657/* 658 * edac_pci_do_parity_check 659 * 660 * performs the actual PCI parity check operation 661 */ 662void edac_pci_do_parity_check(void) 663{ 664 int before_count; 665 666 edac_dbg(3, "\n"); 667 668 /* if policy has PCI check off, leave now */ 669 if (!check_pci_errors) 670 return; 671 672 before_count = atomic_read(&pci_parity_count); 673 674 /* scan all PCI devices looking for a Parity Error on devices and 675 * bridges. 676 * The iterator calls pci_get_device() which might sleep, thus 677 * we cannot disable interrupts in this scan. 678 */ 679 edac_pci_dev_parity_iterator(edac_pci_dev_parity_test); 680 681 /* Only if operator has selected panic on PCI Error */ 682 if (edac_pci_get_panic_on_pe()) { 683 /* If the count is different 'after' from 'before' */ 684 if (before_count != atomic_read(&pci_parity_count)) 685 panic("EDAC: PCI Parity Error"); 686 } 687} 688 689/* 690 * edac_pci_clear_parity_errors 691 * 692 * function to perform an iteration over the PCI devices 693 * and clearn their current status 694 */ 695void edac_pci_clear_parity_errors(void) 696{ 697 /* Clear any PCI bus parity errors that devices initially have logged 698 * in their registers. 699 */ 700 edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear); 701} 702 703/* 704 * edac_pci_handle_pe 705 * 706 * Called to handle a PARITY ERROR event 707 */ 708void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg) 709{ 710 711 /* global PE counter incremented by edac_pci_do_parity_check() */ 712 atomic_inc(&pci->counters.pe_count); 713 714 if (edac_pci_get_log_pe()) 715 edac_pci_printk(pci, KERN_WARNING, 716 "Parity Error ctl: %s %d: %s\n", 717 pci->ctl_name, pci->pci_idx, msg); 718 719 /* 720 * poke all PCI devices and see which one is the troublemaker 721 * panic() is called if set 722 */ 723 edac_pci_do_parity_check(); 724} 725EXPORT_SYMBOL_GPL(edac_pci_handle_pe); 726 727 728/* 729 * edac_pci_handle_npe 730 * 731 * Called to handle a NON-PARITY ERROR event 732 */ 733void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg) 734{ 735 736 /* global NPE counter incremented by edac_pci_do_parity_check() */ 737 atomic_inc(&pci->counters.npe_count); 738 739 if (edac_pci_get_log_npe()) 740 edac_pci_printk(pci, KERN_WARNING, 741 "Non-Parity Error ctl: %s %d: %s\n", 742 pci->ctl_name, pci->pci_idx, msg); 743 744 /* 745 * poke all PCI devices and see which one is the troublemaker 746 * panic() is called if set 747 */ 748 edac_pci_do_parity_check(); 749} 750EXPORT_SYMBOL_GPL(edac_pci_handle_npe); 751 752/* 753 * Define the PCI parameter to the module 754 */ 755module_param(check_pci_errors, int, 0644); 756MODULE_PARM_DESC(check_pci_errors, 757 "Check for PCI bus parity errors: 0=off 1=on"); 758module_param(edac_pci_panic_on_pe, int, 0644); 759MODULE_PARM_DESC(edac_pci_panic_on_pe, 760 "Panic on PCI Bus Parity error: 0=off 1=on"); 761