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_core.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()
 335  *
 336  *      setup the sysfs for EDAC PCI attributes
 337  *      assumes edac_subsys has already been initialized
 338  */
 339 static 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 */
 396 kobject_init_and_add_fail:
 397         kfree(edac_pci_top_main_kobj);
 398
 399 kzalloc_fail:
 400         module_put(THIS_MODULE);
 401
 402 mod_get_fail:
 403         edac_put_sysfs_subsys();
 404
 405 decrement_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  */
 418 static 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  */
 439 int 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 */
 465 symlink_fail:
 466         edac_pci_unregister_sysfs_instance_kobj(pci);
 467
 468 unregister_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  */
 479 void 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 *************************/
 498 static 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. */
 532 static 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  */
 552 static 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 */
 641 typedef 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  */
 649 static 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  */
 662 void 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  */
 695 void 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  */
 708 void 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 }
 725 EXPORT_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  */
 733 void 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 }
 750 EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
 751
 752 /*
 753  * Define the PCI parameter to the module
 754  */
 755 module_param(check_pci_errors, int, 0644);
 756 MODULE_PARM_DESC(check_pci_errors,
 757                  "Check for PCI bus parity errors: 0=off 1=on");
 758 module_param(edac_pci_panic_on_pe, int, 0644);
 759 MODULE_PARM_DESC(edac_pci_panic_on_pe,
 760                  "Panic on PCI Bus Parity error: 0=off 1=on");