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/sysdev.h>
  11 #include <linux/ctype.h>
  12
  13 #include "edac_core.h"
  14 #include "edac_module.h"
  15
  16 /* Turn off this whole feature if PCI is not configured */
  17 #ifdef CONFIG_PCI
  18
  19 #define EDAC_PCI_SYMLINK        "device"
  20
  21 /* data variables exported via sysfs */
  22 static int check_pci_errors;            /* default NO check PCI parity */
  23 static int edac_pci_panic_on_pe;        /* default NO panic on PCI Parity */
  24 static int edac_pci_log_pe = 1;         /* log PCI parity errors */
  25 static int edac_pci_log_npe = 1;        /* log PCI non-parity error errors */
  26 static int edac_pci_poll_msec = 1000;   /* one second workq period */
  27
  28 static atomic_t pci_parity_count = ATOMIC_INIT(0);
  29 static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
  30
  31 static struct kobject edac_pci_top_main_kobj;
  32 static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
  33
  34 /* getter functions for the data variables */
  35 int edac_pci_get_check_errors(void)
  36 {
  37         return check_pci_errors;
  38 }
  39
  40 static int edac_pci_get_log_pe(void)
  41 {
  42         return edac_pci_log_pe;
  43 }
  44
  45 static int edac_pci_get_log_npe(void)
  46 {
  47         return edac_pci_log_npe;
  48 }
  49
  50 static int edac_pci_get_panic_on_pe(void)
  51 {
  52         return edac_pci_panic_on_pe;
  53 }
  54
  55 int edac_pci_get_poll_msec(void)
  56 {
  57         return edac_pci_poll_msec;
  58 }
  59
  60 /**************************** EDAC PCI sysfs instance *******************/
  61 static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
  62 {
  63         return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
  64 }
  65
  66 static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
  67                                 char *data)
  68 {
  69         return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
  70 }
  71
  72 #define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
  73 #define to_instance_attr(a) container_of(a, struct instance_attribute, attr)
  74
  75 /* DEVICE instance kobject release() function */
  76 static void edac_pci_instance_release(struct kobject *kobj)
  77 {
  78         struct edac_pci_ctl_info *pci;
  79
  80         debugf0("%s()\n", __func__);
  81
  82         /* Form pointer to containing struct, the pci control struct */
  83         pci = to_instance(kobj);
  84
  85         /* decrement reference count on top main kobj */
  86         kobject_put(&edac_pci_top_main_kobj);
  87
  88         kfree(pci);     /* Free the control struct */
  89 }
  90
  91 /* instance specific attribute structure */
  92 struct instance_attribute {
  93         struct attribute attr;
  94         ssize_t(*show) (struct edac_pci_ctl_info *, char *);
  95         ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
  96 };
  97
  98 /* Function to 'show' fields from the edac_pci 'instance' structure */
  99 static ssize_t edac_pci_instance_show(struct kobject *kobj,
 100                                 struct attribute *attr, char *buffer)
 101 {
 102         struct edac_pci_ctl_info *pci = to_instance(kobj);
 103         struct instance_attribute *instance_attr = to_instance_attr(attr);
 104
 105         if (instance_attr->show)
 106                 return instance_attr->show(pci, buffer);
 107         return -EIO;
 108 }
 109
 110 /* Function to 'store' fields into the edac_pci 'instance' structure */
 111 static ssize_t edac_pci_instance_store(struct kobject *kobj,
 112                                 struct attribute *attr,
 113                                 const char *buffer, size_t count)
 114 {
 115         struct edac_pci_ctl_info *pci = to_instance(kobj);
 116         struct instance_attribute *instance_attr = to_instance_attr(attr);
 117
 118         if (instance_attr->store)
 119                 return instance_attr->store(pci, buffer, count);
 120         return -EIO;
 121 }
 122
 123 /* fs_ops table */
 124 static struct sysfs_ops pci_instance_ops = {
 125         .show = edac_pci_instance_show,
 126         .store = edac_pci_instance_store
 127 };
 128
 129 #define INSTANCE_ATTR(_name, _mode, _show, _store)      \
 130 static struct instance_attribute attr_instance_##_name = {      \
 131         .attr   = {.name = __stringify(_name), .mode = _mode }, \
 132         .show   = _show,                                        \
 133         .store  = _store,                                       \
 134 };
 135
 136 INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
 137 INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
 138
 139 /* pci instance attributes */
 140 static struct instance_attribute *pci_instance_attr[] = {
 141         &attr_instance_pe_count,
 142         &attr_instance_npe_count,
 143         NULL
 144 };
 145
 146 /* the ktype for a pci instance */
 147 static struct kobj_type ktype_pci_instance = {
 148         .release = edac_pci_instance_release,
 149         .sysfs_ops = &pci_instance_ops,
 150         .default_attrs = (struct attribute **)pci_instance_attr,
 151 };
 152
 153 /*
 154  * edac_pci_create_instance_kobj
 155  *
 156  *      construct one EDAC PCI instance's kobject for use
 157  */
 158 static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
 159 {
 160         struct kobject *main_kobj;
 161         int err;
 162
 163         debugf0("%s()\n", __func__);
 164
 165         /* First bump the ref count on the top main kobj, which will
 166          * track the number of PCI instances we have, and thus nest
 167          * properly on keeping the module loaded
 168          */
 169         main_kobj = kobject_get(&edac_pci_top_main_kobj);
 170         if (!main_kobj) {
 171                 err = -ENODEV;
 172                 goto error_out;
 173         }
 174
 175         /* And now register this new kobject under the main kobj */
 176         err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
 177                                    &edac_pci_top_main_kobj, "pci%d", idx);
 178         if (err != 0) {
 179                 debugf2("%s() failed to register instance pci%d\n",
 180                         __func__, idx);
 181                 kobject_put(&edac_pci_top_main_kobj);
 182                 goto error_out;
 183         }
 184
 185         kobject_uevent(&pci->kobj, KOBJ_ADD);
 186         debugf1("%s() Register instance 'pci%d' kobject\n", __func__, 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         debugf0("%s()\n", __func__);
 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->show)
 260                 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
 261         return -EIO;
 262 }
 263
 264 static 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
 320         debugf0("%s() here to module_put(THIS_MODULE)\n", __func__);
 321
 322         /* last reference to top EDAC PCI kobject has been removed,
 323          * NOW release our ref count on the core module
 324          */
 325         module_put(THIS_MODULE);
 326 }
 327
 328 /* ktype struct for the EDAC PCI main kobj */
 329 static struct kobj_type ktype_edac_pci_main_kobj = {
 330         .release = edac_pci_release_main_kobj,
 331         .sysfs_ops = &edac_pci_sysfs_ops,
 332         .default_attrs = (struct attribute **)edac_pci_attr,
 333 };
 334
 335 /**
 336  * edac_pci_main_kobj_setup()
 337  *
 338  *      setup the sysfs for EDAC PCI attributes
 339  *      assumes edac_class has already been initialized
 340  */
 341 static int edac_pci_main_kobj_setup(void)
 342 {
 343         int err;
 344         struct sysdev_class *edac_class;
 345
 346         debugf0("%s()\n", __func__);
 347
 348         /* check and count if we have already created the main kobject */
 349         if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
 350                 return 0;
 351
 352         /* First time, so create the main kobject and its
 353          * controls and atributes
 354          */
 355         edac_class = edac_get_edac_class();
 356         if (edac_class == NULL) {
 357                 debugf1("%s() no edac_class\n", __func__);
 358                 err = -ENODEV;
 359                 goto decrement_count_fail;
 360         }
 361
 362         /* Bump the reference count on this module to ensure the
 363          * modules isn't unloaded until we deconstruct the top
 364          * level main kobj for EDAC PCI
 365          */
 366         if (!try_module_get(THIS_MODULE)) {
 367                 debugf1("%s() try_module_get() failed\n", __func__);
 368                 err = -ENODEV;
 369                 goto decrement_count_fail;
 370         }
 371
 372         /* Instanstiate the pci object */
 373         err = kobject_init_and_add(&edac_pci_top_main_kobj, &ktype_edac_pci_main_kobj,
 374                                    &edac_class->kset.kobj, "pci");
 375         if (err) {
 376                 debugf1("Failed to register '.../edac/pci'\n");
 377                 goto kobject_init_and_add_fail;
 378         }
 379
 380         /* At this point, to 'release' the top level kobject
 381          * for EDAC PCI, then edac_pci_main_kobj_teardown()
 382          * must be used, for resources to be cleaned up properly
 383          */
 384         kobject_uevent(&edac_pci_top_main_kobj, KOBJ_ADD);
 385         debugf1("Registered '.../edac/pci' kobject\n");
 386
 387         return 0;
 388
 389         /* Error unwind statck */
 390 kobject_init_and_add_fail:
 391         module_put(THIS_MODULE);
 392
 393 decrement_count_fail:
 394         /* if are on this error exit, nothing to tear down */
 395         atomic_dec(&edac_pci_sysfs_refcount);
 396
 397         return err;
 398 }
 399
 400 /*
 401  * edac_pci_main_kobj_teardown()
 402  *
 403  *      if no longer linked (needed) remove the top level EDAC PCI
 404  *      kobject with its controls and attributes
 405  */
 406 static void edac_pci_main_kobj_teardown(void)
 407 {
 408         debugf0("%s()\n", __func__);
 409
 410         /* Decrement the count and only if no more controller instances
 411          * are connected perform the unregisteration of the top level
 412          * main kobj
 413          */
 414         if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
 415                 debugf0("%s() called kobject_put on main kobj\n",
 416                         __func__);
 417                 kobject_put(&edac_pci_top_main_kobj);
 418         }
 419 }
 420
 421 /*
 422  *
 423  * edac_pci_create_sysfs
 424  *
 425  *      Create the controls/attributes for the specified EDAC PCI device
 426  */
 427 int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
 428 {
 429         int err;
 430         struct kobject *edac_kobj = &pci->kobj;
 431
 432         debugf0("%s() idx=%d\n", __func__, pci->pci_idx);
 433
 434         /* create the top main EDAC PCI kobject, IF needed */
 435         err = edac_pci_main_kobj_setup();
 436         if (err)
 437                 return err;
 438
 439         /* Create this instance's kobject under the MAIN kobject */
 440         err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
 441         if (err)
 442                 goto unregister_cleanup;
 443
 444         err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
 445         if (err) {
 446                 debugf0("%s() sysfs_create_link() returned err= %d\n",
 447                         __func__, err);
 448                 goto symlink_fail;
 449         }
 450
 451         return 0;
 452
 453         /* Error unwind stack */
 454 symlink_fail:
 455         edac_pci_unregister_sysfs_instance_kobj(pci);
 456
 457 unregister_cleanup:
 458         edac_pci_main_kobj_teardown();
 459
 460         return err;
 461 }
 462
 463 /*
 464  * edac_pci_remove_sysfs
 465  *
 466  *      remove the controls and attributes for this EDAC PCI device
 467  */
 468 void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
 469 {
 470         debugf0("%s() index=%d\n", __func__, pci->pci_idx);
 471
 472         /* Remove the symlink */
 473         sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
 474
 475         /* remove this PCI instance's sysfs entries */
 476         edac_pci_unregister_sysfs_instance_kobj(pci);
 477
 478         /* Call the main unregister function, which will determine
 479          * if this 'pci' is the last instance.
 480          * If it is, the main kobject will be unregistered as a result
 481          */
 482         debugf0("%s() calling edac_pci_main_kobj_teardown()\n", __func__);
 483         edac_pci_main_kobj_teardown();
 484 }
 485
 486 /************************ PCI error handling *************************/
 487 static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
 488 {
 489         int where;
 490         u16 status;
 491
 492         where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
 493         pci_read_config_word(dev, where, &status);
 494
 495         /* If we get back 0xFFFF then we must suspect that the card has been
 496          * pulled but the Linux PCI layer has not yet finished cleaning up.
 497          * We don't want to report on such devices
 498          */
 499
 500         if (status == 0xFFFF) {
 501                 u32 sanity;
 502
 503                 pci_read_config_dword(dev, 0, &sanity);
 504
 505                 if (sanity == 0xFFFFFFFF)
 506                         return 0;
 507         }
 508
 509         status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
 510                 PCI_STATUS_PARITY;
 511
 512         if (status)
 513                 /* reset only the bits we are interested in */
 514                 pci_write_config_word(dev, where, status);
 515
 516         return status;
 517 }
 518
 519
 520 /* Clear any PCI parity errors logged by this device. */
 521 static void edac_pci_dev_parity_clear(struct pci_dev *dev)
 522 {
 523         u8 header_type;
 524
 525         debugf0("%s()\n", __func__);
 526
 527         get_pci_parity_status(dev, 0);
 528
 529         /* read the device TYPE, looking for bridges */
 530         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
 531
 532         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
 533                 get_pci_parity_status(dev, 1);
 534 }
 535
 536 /*
 537  *  PCI Parity polling
 538  *
 539  *      Fucntion to retrieve the current parity status
 540  *      and decode it
 541  *
 542  */
 543 static void edac_pci_dev_parity_test(struct pci_dev *dev)
 544 {
 545         unsigned long flags;
 546         u16 status;
 547         u8 header_type;
 548
 549         /* stop any interrupts until we can acquire the status */
 550         local_irq_save(flags);
 551
 552         /* read the STATUS register on this device */
 553         status = get_pci_parity_status(dev, 0);
 554
 555         /* read the device TYPE, looking for bridges */
 556         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
 557
 558         local_irq_restore(flags);
 559
 560         debugf4("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id);
 561
 562         /* check the status reg for errors on boards NOT marked as broken
 563          * if broken, we cannot trust any of the status bits
 564          */
 565         if (status && !dev->broken_parity_status) {
 566                 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 567                         edac_printk(KERN_CRIT, EDAC_PCI,
 568                                 "Signaled System Error on %s\n",
 569                                 pci_name(dev));
 570                         atomic_inc(&pci_nonparity_count);
 571                 }
 572
 573                 if (status & (PCI_STATUS_PARITY)) {
 574                         edac_printk(KERN_CRIT, EDAC_PCI,
 575                                 "Master Data Parity Error on %s\n",
 576                                 pci_name(dev));
 577
 578                         atomic_inc(&pci_parity_count);
 579                 }
 580
 581                 if (status & (PCI_STATUS_DETECTED_PARITY)) {
 582                         edac_printk(KERN_CRIT, EDAC_PCI,
 583                                 "Detected Parity Error on %s\n",
 584                                 pci_name(dev));
 585
 586                         atomic_inc(&pci_parity_count);
 587                 }
 588         }
 589
 590
 591         debugf4("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id);
 592
 593         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
 594                 /* On bridges, need to examine secondary status register  */
 595                 status = get_pci_parity_status(dev, 1);
 596
 597                 debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev->dev.bus_id);
 598
 599                 /* check the secondary status reg for errors,
 600                  * on NOT broken boards
 601                  */
 602                 if (status && !dev->broken_parity_status) {
 603                         if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 604                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 605                                         "Signaled System Error on %s\n",
 606                                         pci_name(dev));
 607                                 atomic_inc(&pci_nonparity_count);
 608                         }
 609
 610                         if (status & (PCI_STATUS_PARITY)) {
 611                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 612                                         "Master Data Parity Error on "
 613                                         "%s\n", pci_name(dev));
 614
 615                                 atomic_inc(&pci_parity_count);
 616                         }
 617
 618                         if (status & (PCI_STATUS_DETECTED_PARITY)) {
 619                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 620                                         "Detected Parity Error on %s\n",
 621                                         pci_name(dev));
 622
 623                                 atomic_inc(&pci_parity_count);
 624                         }
 625                 }
 626         }
 627 }
 628
 629 /* reduce some complexity in definition of the iterator */
 630 typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
 631
 632 /*
 633  * pci_dev parity list iterator
 634  *      Scan the PCI device list for one pass, looking for SERRORs
 635  *      Master Parity ERRORS or Parity ERRORs on primary or secondary devices
 636  */
 637 static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
 638 {
 639         struct pci_dev *dev = NULL;
 640
 641         /* request for kernel access to the next PCI device, if any,
 642          * and while we are looking at it have its reference count
 643          * bumped until we are done with it
 644          */
 645         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 646                 fn(dev);
 647         }
 648 }
 649
 650 /*
 651  * edac_pci_do_parity_check
 652  *
 653  *      performs the actual PCI parity check operation
 654  */
 655 void edac_pci_do_parity_check(void)
 656 {
 657         int before_count;
 658
 659         debugf3("%s()\n", __func__);
 660
 661         /* if policy has PCI check off, leave now */
 662         if (!check_pci_errors)
 663                 return;
 664
 665         before_count = atomic_read(&pci_parity_count);
 666
 667         /* scan all PCI devices looking for a Parity Error on devices and
 668          * bridges.
 669          * The iterator calls pci_get_device() which might sleep, thus
 670          * we cannot disable interrupts in this scan.
 671          */
 672         edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
 673
 674         /* Only if operator has selected panic on PCI Error */
 675         if (edac_pci_get_panic_on_pe()) {
 676                 /* If the count is different 'after' from 'before' */
 677                 if (before_count != atomic_read(&pci_parity_count))
 678                         panic("EDAC: PCI Parity Error");
 679         }
 680 }
 681
 682 /*
 683  * edac_pci_clear_parity_errors
 684  *
 685  *      function to perform an iteration over the PCI devices
 686  *      and clearn their current status
 687  */
 688 void edac_pci_clear_parity_errors(void)
 689 {
 690         /* Clear any PCI bus parity errors that devices initially have logged
 691          * in their registers.
 692          */
 693         edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
 694 }
 695
 696 /*
 697  * edac_pci_handle_pe
 698  *
 699  *      Called to handle a PARITY ERROR event
 700  */
 701 void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
 702 {
 703
 704         /* global PE counter incremented by edac_pci_do_parity_check() */
 705         atomic_inc(&pci->counters.pe_count);
 706
 707         if (edac_pci_get_log_pe())
 708                 edac_pci_printk(pci, KERN_WARNING,
 709                                 "Parity Error ctl: %s %d: %s\n",
 710                                 pci->ctl_name, pci->pci_idx, msg);
 711
 712         /*
 713          * poke all PCI devices and see which one is the troublemaker
 714          * panic() is called if set
 715          */
 716         edac_pci_do_parity_check();
 717 }
 718 EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
 719
 720
 721 /*
 722  * edac_pci_handle_npe
 723  *
 724  *      Called to handle a NON-PARITY ERROR event
 725  */
 726 void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
 727 {
 728
 729         /* global NPE counter incremented by edac_pci_do_parity_check() */
 730         atomic_inc(&pci->counters.npe_count);
 731
 732         if (edac_pci_get_log_npe())
 733                 edac_pci_printk(pci, KERN_WARNING,
 734                                 "Non-Parity Error ctl: %s %d: %s\n",
 735                                 pci->ctl_name, pci->pci_idx, msg);
 736
 737         /*
 738          * poke all PCI devices and see which one is the troublemaker
 739          * panic() is called if set
 740          */
 741         edac_pci_do_parity_check();
 742 }
 743 EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
 744
 745 /*
 746  * Define the PCI parameter to the module
 747  */
 748 module_param(check_pci_errors, int, 0644);
 749 MODULE_PARM_DESC(check_pci_errors,
 750                  "Check for PCI bus parity errors: 0=off 1=on");
 751 module_param(edac_pci_panic_on_pe, int, 0644);
 752 MODULE_PARM_DESC(edac_pci_panic_on_pe,
 753                  "Panic on PCI Bus Parity error: 0=off 1=on");
 754
 755 #endif                          /* CONFIG_PCI */