drivers/edac/edac_pci_sysfs.c

   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_pci.h"
  15 #include "edac_module.h"
  16
  17 #define EDAC_PCI_SYMLINK        "device"
  18
  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 */
  23 static int edac_pci_log_npe = 1;        /* log PCI non-parity error errors */
  24 static int edac_pci_poll_msec = 1000;   /* one second workq period */
  25
  26 static atomic_t pci_parity_count = ATOMIC_INIT(0);
  27 static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
  28
  29 static struct kobject *edac_pci_top_main_kobj;
  30 static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
  31
  32 /* getter functions for the data variables */
  33 int edac_pci_get_check_errors(void)
  34 {
  35         return check_pci_errors;
  36 }
  37
  38 static int edac_pci_get_log_pe(void)
  39 {
  40         return edac_pci_log_pe;
  41 }
  42
  43 static int edac_pci_get_log_npe(void)
  44 {
  45         return edac_pci_log_npe;
  46 }
  47
  48 static int edac_pci_get_panic_on_pe(void)
  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
  58 /**************************** EDAC PCI sysfs instance *******************/
  59 static 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
  64 static 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 */
  74 static 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 */
  90 struct 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 */
  97 static 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 */
 109 static 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 */
 122 static 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)      \
 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 };
 143
 144 /* the ktype for a pci instance */
 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
 151 /*
 152  * edac_pci_create_instance_kobj
 153  *
 154  *      construct one EDAC PCI instance's kobject for use
 155  */
 156 static 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 */
 188 error_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  */
 197 static 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 */
 214 static ssize_t edac_pci_int_show(void *ptr, char *buffer)
 215 {
 216         int *value = ptr;
 217         return sprintf(buffer, "%d\n", *value);
 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))
 225                 *value = simple_strtoul(buffer, NULL, 0);
 226
 227         return count;
 228 }
 229
 230 struct 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 */
 238 static 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
 249 static 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
 261 static 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)                 \
 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 */
 283 EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
 284         edac_pci_int_store);
 285 EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
 286         edac_pci_int_store);
 287 EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
 288         edac_pci_int_store);
 289 EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
 290         edac_pci_int_store);
 291 EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
 292 EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
 293
 294 /* Base Attributes of the memory ECC object */
 295 static 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  */
 314 static 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 */
 327 static 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: Setup the sysfs for EDAC PCI attributes.
 335  */
 336 static int edac_pci_main_kobj_setup(void)
 337 {
 338         int err;
 339         struct bus_type *edac_subsys;
 340
 341         edac_dbg(0, "\n");
 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;
 346
 347         /* First time, so create the main kobject and its
 348          * controls and attributes
 349          */
 350         edac_subsys = edac_get_sysfs_subsys();
 351
 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)) {
 357                 edac_dbg(1, "try_module_get() failed\n");
 358                 err = -ENODEV;
 359                 goto decrement_count_fail;
 360         }
 361
 362         edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
 363         if (!edac_pci_top_main_kobj) {
 364                 edac_dbg(1, "Failed to allocate\n");
 365                 err = -ENOMEM;
 366                 goto kzalloc_fail;
 367         }
 368
 369         /* Instanstiate the pci object */
 370         err = kobject_init_and_add(edac_pci_top_main_kobj,
 371                                    &ktype_edac_pci_main_kobj,
 372                                    &edac_subsys->dev_root->kobj, "pci");
 373         if (err) {
 374                 edac_dbg(1, "Failed to register '.../edac/pci'\n");
 375                 goto kobject_init_and_add_fail;
 376         }
 377
 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          */
 382         kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
 383         edac_dbg(1, "Registered '.../edac/pci' kobject\n");
 384
 385         return 0;
 386
 387         /* Error unwind statck */
 388 kobject_init_and_add_fail:
 389         kobject_put(edac_pci_top_main_kobj);
 390
 391 kzalloc_fail:
 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;
 399 }
 400
 401 /*
 402  * edac_pci_main_kobj_teardown()
 403  *
 404  *      if no longer linked (needed) remove the top level EDAC PCI
 405  *      kobject with its controls and attributes
 406  */
 407 static void edac_pci_main_kobj_teardown(void)
 408 {
 409         edac_dbg(0, "\n");
 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) {
 416                 edac_dbg(0, "called kobject_put on main kobj\n");
 417                 kobject_put(edac_pci_top_main_kobj);
 418         }
 419 }
 420
 421 int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
 422 {
 423         int err;
 424         struct kobject *edac_kobj = &pci->kobj;
 425
 426         edac_dbg(0, "idx=%d\n", pci->pci_idx);
 427
 428         /* create the top main EDAC PCI kobject, IF needed */
 429         err = edac_pci_main_kobj_setup();
 430         if (err)
 431                 return err;
 432
 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;
 437
 438         err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
 439         if (err) {
 440                 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
 441                 goto symlink_fail;
 442         }
 443
 444         return 0;
 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;
 454 }
 455
 456 void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
 457 {
 458         edac_dbg(0, "index=%d\n", pci->pci_idx);
 459
 460         /* Remove the symlink */
 461         sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
 462
 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          */
 470         edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n");
 471         edac_pci_main_kobj_teardown();
 472 }
 473
 474 /************************ PCI error handling *************************/
 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 |
 498                 PCI_STATUS_PARITY;
 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
 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  *
 525  *      Function to retrieve the current parity status
 526  *      and decode it
 527  *
 528  */
 529 static void edac_pci_dev_parity_test(struct pci_dev *dev)
 530 {
 531         unsigned long flags;
 532         u16 status;
 533         u8 header_type;
 534
 535         /* stop any interrupts until we can acquire the status */
 536         local_irq_save(flags);
 537
 538         /* read the STATUS register on this device */
 539         status = 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         local_irq_restore(flags);
 545
 546         edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
 547
 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) {
 552                 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 553                         edac_printk(KERN_CRIT, EDAC_PCI,
 554                                 "Signaled System Error on %s\n",
 555                                 pci_name(dev));
 556                         atomic_inc(&pci_nonparity_count);
 557                 }
 558
 559                 if (status & (PCI_STATUS_PARITY)) {
 560                         edac_printk(KERN_CRIT, EDAC_PCI,
 561                                 "Master Data Parity Error on %s\n",
 562                                 pci_name(dev));
 563
 564                         atomic_inc(&pci_parity_count);
 565                 }
 566
 567                 if (status & (PCI_STATUS_DETECTED_PARITY)) {
 568                         edac_printk(KERN_CRIT, EDAC_PCI,
 569                                 "Detected Parity Error on %s\n",
 570                                 pci_name(dev));
 571
 572                         atomic_inc(&pci_parity_count);
 573                 }
 574         }
 575
 576
 577         edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n",
 578                  header_type, dev_name(&dev->dev));
 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
 584                 edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n",
 585                          status, dev_name(&dev->dev));
 586
 587                 /* check the secondary status reg for errors,
 588                  * on NOT broken boards
 589                  */
 590                 if (status && !dev->broken_parity_status) {
 591                         if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 592                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 593                                         "Signaled System Error on %s\n",
 594                                         pci_name(dev));
 595                                 atomic_inc(&pci_nonparity_count);
 596                         }
 597
 598                         if (status & (PCI_STATUS_PARITY)) {
 599                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 600                                         "Master Data Parity Error on "
 601                                         "%s\n", pci_name(dev));
 602
 603                                 atomic_inc(&pci_parity_count);
 604                         }
 605
 606                         if (status & (PCI_STATUS_DETECTED_PARITY)) {
 607                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 608                                         "Detected Parity Error on %s\n",
 609                                         pci_name(dev));
 610
 611                                 atomic_inc(&pci_parity_count);
 612                         }
 613                 }
 614         }
 615 }
 616
 617 /* reduce some complexity in definition of the iterator */
 618 typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
 619
 620 /*
 621  * pci_dev parity list iterator
 622  *
 623  *      Scan the PCI device list looking for SERRORs, Master Parity ERRORS or
 624  *      Parity ERRORs on primary or secondary devices.
 625  */
 626 static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
 627 {
 628         struct pci_dev *dev = NULL;
 629
 630         for_each_pci_dev(dev)
 631                 fn(dev);
 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 {
 641         int before_count;
 642
 643         edac_dbg(3, "\n");
 644
 645         /* if policy has PCI check off, leave now */
 646         if (!check_pci_errors)
 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
 652          * bridges.
 653          * The iterator calls pci_get_device() which might sleep, thus
 654          * we cannot disable interrupts in this scan.
 655          */
 656         edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
 657
 658         /* Only if operator has selected panic on PCI Error */
 659         if (edac_pci_get_panic_on_pe()) {
 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
 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  */
 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 }
 679
 680 /*
 681  * edac_pci_handle_pe
 682  *
 683  *      Called to handle a PARITY ERROR event
 684  */
 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
 691         if (edac_pci_get_log_pe())
 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);
 703
 704
 705 /*
 706  * edac_pci_handle_npe
 707  *
 708  *      Called to handle a NON-PARITY ERROR event
 709  */
 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
 716         if (edac_pci_get_log_npe())
 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);
 728
 729 /*
 730  * Define the PCI parameter to the module
 731  */
 732 module_param(check_pci_errors, int, 0644);
 733 MODULE_PARM_DESC(check_pci_errors,
 734                  "Check for PCI bus parity errors: 0=off 1=on");
 735 module_param(edac_pci_panic_on_pe, int, 0644);
 736 MODULE_PARM_DESC(edac_pci_panic_on_pe,
 737                  "Panic on PCI Bus Parity error: 0=off 1=on");