linux/drivers/edac/edac_pci_sysfs.c
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   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 */
  22static int check_pci_errors;            /* default NO check PCI parity */
  23static int edac_pci_panic_on_pe;        /* default NO panic on PCI Parity */
  24static int edac_pci_log_pe = 1;         /* log PCI parity errors */
  25static int edac_pci_log_npe = 1;        /* log PCI non-parity error errors */
  26static int edac_pci_poll_msec = 1000;   /* one second workq period */
  27
  28static atomic_t pci_parity_count = ATOMIC_INIT(0);
  29static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
  30
  31static struct kobject *edac_pci_top_main_kobj;
  32static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
  33
  34/* getter functions for the data variables */
  35int edac_pci_get_check_errors(void)
  36{
  37        return check_pci_errors;
  38}
  39
  40static int edac_pci_get_log_pe(void)
  41{
  42        return edac_pci_log_pe;
  43}
  44
  45static int edac_pci_get_log_npe(void)
  46{
  47        return edac_pci_log_npe;
  48}
  49
  50static int edac_pci_get_panic_on_pe(void)
  51{
  52        return edac_pci_panic_on_pe;
  53}
  54
  55int edac_pci_get_poll_msec(void)
  56{
  57        return edac_pci_poll_msec;
  58}
  59
  60/**************************** EDAC PCI sysfs instance *******************/
  61static 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
  66static 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 */
  76static 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 */
  92struct 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 */
  99static 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 */
 111static 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 */
 124static 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)      \
 130static struct instance_attribute attr_instance_##_name = {      \
 131        .attr   = {.name = __stringify(_name), .mode = _mode }, \
 132        .show   = _show,                                        \
 133        .store  = _store,                                       \
 134};
 135
 136INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
 137INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
 138
 139/* pci instance attributes */
 140static 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 */
 147static 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 */
 158static 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 */
 191error_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 */
 200static 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 */
 217static ssize_t edac_pci_int_show(void *ptr, char *buffer)
 218{
 219        int *value = ptr;
 220        return sprintf(buffer, "%d\n", *value);
 221}
 222
 223static 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
 233struct 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 */
 241static 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
 252static 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
 264static 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)                 \
 270static 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)    \
 278static 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 */
 286EDAC_PCI_ATTR(check_pci_errors, S_IRUGO | S_IWUSR, edac_pci_int_show,
 287        edac_pci_int_store);
 288EDAC_PCI_ATTR(edac_pci_log_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
 289        edac_pci_int_store);
 290EDAC_PCI_ATTR(edac_pci_log_npe, S_IRUGO | S_IWUSR, edac_pci_int_show,
 291        edac_pci_int_store);
 292EDAC_PCI_ATTR(edac_pci_panic_on_pe, S_IRUGO | S_IWUSR, edac_pci_int_show,
 293        edac_pci_int_store);
 294EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
 295EDAC_PCI_ATTR(pci_nonparity_count, S_IRUGO, edac_pci_int_show, NULL);
 296
 297/* Base Attributes of the memory ECC object */
 298static 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 */
 317static void edac_pci_release_main_kobj(struct kobject *kobj)
 318{
 319        debugf0("%s() here to module_put(THIS_MODULE)\n", __func__);
 320
 321        kfree(kobj);
 322
 323        /* last reference to top EDAC PCI kobject has been removed,
 324         * NOW release our ref count on the core module
 325         */
 326        module_put(THIS_MODULE);
 327}
 328
 329/* ktype struct for the EDAC PCI main kobj */
 330static struct kobj_type ktype_edac_pci_main_kobj = {
 331        .release = edac_pci_release_main_kobj,
 332        .sysfs_ops = &edac_pci_sysfs_ops,
 333        .default_attrs = (struct attribute **)edac_pci_attr,
 334};
 335
 336/**
 337 * edac_pci_main_kobj_setup()
 338 *
 339 *      setup the sysfs for EDAC PCI attributes
 340 *      assumes edac_class has already been initialized
 341 */
 342static int edac_pci_main_kobj_setup(void)
 343{
 344        int err;
 345        struct sysdev_class *edac_class;
 346
 347        debugf0("%s()\n", __func__);
 348
 349        /* check and count if we have already created the main kobject */
 350        if (atomic_inc_return(&edac_pci_sysfs_refcount) != 1)
 351                return 0;
 352
 353        /* First time, so create the main kobject and its
 354         * controls and atributes
 355         */
 356        edac_class = edac_get_edac_class();
 357        if (edac_class == NULL) {
 358                debugf1("%s() no edac_class\n", __func__);
 359                err = -ENODEV;
 360                goto decrement_count_fail;
 361        }
 362
 363        /* Bump the reference count on this module to ensure the
 364         * modules isn't unloaded until we deconstruct the top
 365         * level main kobj for EDAC PCI
 366         */
 367        if (!try_module_get(THIS_MODULE)) {
 368                debugf1("%s() try_module_get() failed\n", __func__);
 369                err = -ENODEV;
 370                goto decrement_count_fail;
 371        }
 372
 373        edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
 374        if (!edac_pci_top_main_kobj) {
 375                debugf1("Failed to allocate\n");
 376                err = -ENOMEM;
 377                goto kzalloc_fail;
 378        }
 379
 380        /* Instanstiate the pci object */
 381        err = kobject_init_and_add(edac_pci_top_main_kobj,
 382                                   &ktype_edac_pci_main_kobj,
 383                                   &edac_class->kset.kobj, "pci");
 384        if (err) {
 385                debugf1("Failed to register '.../edac/pci'\n");
 386                goto kobject_init_and_add_fail;
 387        }
 388
 389        /* At this point, to 'release' the top level kobject
 390         * for EDAC PCI, then edac_pci_main_kobj_teardown()
 391         * must be used, for resources to be cleaned up properly
 392         */
 393        kobject_uevent(edac_pci_top_main_kobj, KOBJ_ADD);
 394        debugf1("Registered '.../edac/pci' kobject\n");
 395
 396        return 0;
 397
 398        /* Error unwind statck */
 399kobject_init_and_add_fail:
 400        kfree(edac_pci_top_main_kobj);
 401
 402kzalloc_fail:
 403        module_put(THIS_MODULE);
 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        debugf0("%s()\n", __func__);
 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                debugf0("%s() called kobject_put on main kobj\n",
 428                        __func__);
 429                kobject_put(edac_pci_top_main_kobj);
 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        debugf0("%s() idx=%d\n", __func__, 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                debugf0("%s() sysfs_create_link() returned err= %d\n",
 459                        __func__, err);
 460                goto symlink_fail;
 461        }
 462
 463        return 0;
 464
 465        /* Error unwind stack */
 466symlink_fail:
 467        edac_pci_unregister_sysfs_instance_kobj(pci);
 468
 469unregister_cleanup:
 470        edac_pci_main_kobj_teardown();
 471
 472        return err;
 473}
 474
 475/*
 476 * edac_pci_remove_sysfs
 477 *
 478 *      remove the controls and attributes for this EDAC PCI device
 479 */
 480void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
 481{
 482        debugf0("%s() index=%d\n", __func__, pci->pci_idx);
 483
 484        /* Remove the symlink */
 485        sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
 486
 487        /* remove this PCI instance's sysfs entries */
 488        edac_pci_unregister_sysfs_instance_kobj(pci);
 489
 490        /* Call the main unregister function, which will determine
 491         * if this 'pci' is the last instance.
 492         * If it is, the main kobject will be unregistered as a result
 493         */
 494        debugf0("%s() calling edac_pci_main_kobj_teardown()\n", __func__);
 495        edac_pci_main_kobj_teardown();
 496}
 497
 498/************************ PCI error handling *************************/
 499static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
 500{
 501        int where;
 502        u16 status;
 503
 504        where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
 505        pci_read_config_word(dev, where, &status);
 506
 507        /* If we get back 0xFFFF then we must suspect that the card has been
 508         * pulled but the Linux PCI layer has not yet finished cleaning up.
 509         * We don't want to report on such devices
 510         */
 511
 512        if (status == 0xFFFF) {
 513                u32 sanity;
 514
 515                pci_read_config_dword(dev, 0, &sanity);
 516
 517                if (sanity == 0xFFFFFFFF)
 518                        return 0;
 519        }
 520
 521        status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
 522                PCI_STATUS_PARITY;
 523
 524        if (status)
 525                /* reset only the bits we are interested in */
 526                pci_write_config_word(dev, where, status);
 527
 528        return status;
 529}
 530
 531
 532/* Clear any PCI parity errors logged by this device. */
 533static void edac_pci_dev_parity_clear(struct pci_dev *dev)
 534{
 535        u8 header_type;
 536
 537        debugf0("%s()\n", __func__);
 538
 539        get_pci_parity_status(dev, 0);
 540
 541        /* read the device TYPE, looking for bridges */
 542        pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
 543
 544        if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
 545                get_pci_parity_status(dev, 1);
 546}
 547
 548/*
 549 *  PCI Parity polling
 550 *
 551 *      Fucntion to retrieve the current parity status
 552 *      and decode it
 553 *
 554 */
 555static void edac_pci_dev_parity_test(struct pci_dev *dev)
 556{
 557        unsigned long flags;
 558        u16 status;
 559        u8 header_type;
 560
 561        /* stop any interrupts until we can acquire the status */
 562        local_irq_save(flags);
 563
 564        /* read the STATUS register on this device */
 565        status = get_pci_parity_status(dev, 0);
 566
 567        /* read the device TYPE, looking for bridges */
 568        pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
 569
 570        local_irq_restore(flags);
 571
 572        debugf4("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id);
 573
 574        /* check the status reg for errors on boards NOT marked as broken
 575         * if broken, we cannot trust any of the status bits
 576         */
 577        if (status && !dev->broken_parity_status) {
 578                if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 579                        edac_printk(KERN_CRIT, EDAC_PCI,
 580                                "Signaled System Error on %s\n",
 581                                pci_name(dev));
 582                        atomic_inc(&pci_nonparity_count);
 583                }
 584
 585                if (status & (PCI_STATUS_PARITY)) {
 586                        edac_printk(KERN_CRIT, EDAC_PCI,
 587                                "Master Data Parity Error on %s\n",
 588                                pci_name(dev));
 589
 590                        atomic_inc(&pci_parity_count);
 591                }
 592
 593                if (status & (PCI_STATUS_DETECTED_PARITY)) {
 594                        edac_printk(KERN_CRIT, EDAC_PCI,
 595                                "Detected Parity Error on %s\n",
 596                                pci_name(dev));
 597
 598                        atomic_inc(&pci_parity_count);
 599                }
 600        }
 601
 602
 603        debugf4("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id);
 604
 605        if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
 606                /* On bridges, need to examine secondary status register  */
 607                status = get_pci_parity_status(dev, 1);
 608
 609                debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev->dev.bus_id);
 610
 611                /* check the secondary status reg for errors,
 612                 * on NOT broken boards
 613                 */
 614                if (status && !dev->broken_parity_status) {
 615                        if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 616                                edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 617                                        "Signaled System Error on %s\n",
 618                                        pci_name(dev));
 619                                atomic_inc(&pci_nonparity_count);
 620                        }
 621
 622                        if (status & (PCI_STATUS_PARITY)) {
 623                                edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 624                                        "Master Data Parity Error on "
 625                                        "%s\n", pci_name(dev));
 626
 627                                atomic_inc(&pci_parity_count);
 628                        }
 629
 630                        if (status & (PCI_STATUS_DETECTED_PARITY)) {
 631                                edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 632                                        "Detected Parity Error on %s\n",
 633                                        pci_name(dev));
 634
 635                                atomic_inc(&pci_parity_count);
 636                        }
 637                }
 638        }
 639}
 640
 641/* reduce some complexity in definition of the iterator */
 642typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
 643
 644/*
 645 * pci_dev parity list iterator
 646 *      Scan the PCI device list for one pass, looking for SERRORs
 647 *      Master Parity ERRORS or 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        /* request for kernel access to the next PCI device, if any,
 654         * and while we are looking at it have its reference count
 655         * bumped until we are done with it
 656         */
 657        while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 658                fn(dev);
 659        }
 660}
 661
 662/*
 663 * edac_pci_do_parity_check
 664 *
 665 *      performs the actual PCI parity check operation
 666 */
 667void edac_pci_do_parity_check(void)
 668{
 669        int before_count;
 670
 671        debugf3("%s()\n", __func__);
 672
 673        /* if policy has PCI check off, leave now */
 674        if (!check_pci_errors)
 675                return;
 676
 677        before_count = atomic_read(&pci_parity_count);
 678
 679        /* scan all PCI devices looking for a Parity Error on devices and
 680         * bridges.
 681         * The iterator calls pci_get_device() which might sleep, thus
 682         * we cannot disable interrupts in this scan.
 683         */
 684        edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
 685
 686        /* Only if operator has selected panic on PCI Error */
 687        if (edac_pci_get_panic_on_pe()) {
 688                /* If the count is different 'after' from 'before' */
 689                if (before_count != atomic_read(&pci_parity_count))
 690                        panic("EDAC: PCI Parity Error");
 691        }
 692}
 693
 694/*
 695 * edac_pci_clear_parity_errors
 696 *
 697 *      function to perform an iteration over the PCI devices
 698 *      and clearn their current status
 699 */
 700void edac_pci_clear_parity_errors(void)
 701{
 702        /* Clear any PCI bus parity errors that devices initially have logged
 703         * in their registers.
 704         */
 705        edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
 706}
 707
 708/*
 709 * edac_pci_handle_pe
 710 *
 711 *      Called to handle a PARITY ERROR event
 712 */
 713void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
 714{
 715
 716        /* global PE counter incremented by edac_pci_do_parity_check() */
 717        atomic_inc(&pci->counters.pe_count);
 718
 719        if (edac_pci_get_log_pe())
 720                edac_pci_printk(pci, KERN_WARNING,
 721                                "Parity Error ctl: %s %d: %s\n",
 722                                pci->ctl_name, pci->pci_idx, msg);
 723
 724        /*
 725         * poke all PCI devices and see which one is the troublemaker
 726         * panic() is called if set
 727         */
 728        edac_pci_do_parity_check();
 729}
 730EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
 731
 732
 733/*
 734 * edac_pci_handle_npe
 735 *
 736 *      Called to handle a NON-PARITY ERROR event
 737 */
 738void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
 739{
 740
 741        /* global NPE counter incremented by edac_pci_do_parity_check() */
 742        atomic_inc(&pci->counters.npe_count);
 743
 744        if (edac_pci_get_log_npe())
 745                edac_pci_printk(pci, KERN_WARNING,
 746                                "Non-Parity Error ctl: %s %d: %s\n",
 747                                pci->ctl_name, pci->pci_idx, msg);
 748
 749        /*
 750         * poke all PCI devices and see which one is the troublemaker
 751         * panic() is called if set
 752         */
 753        edac_pci_do_parity_check();
 754}
 755EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
 756
 757/*
 758 * Define the PCI parameter to the module
 759 */
 760module_param(check_pci_errors, int, 0644);
 761MODULE_PARM_DESC(check_pci_errors,
 762                 "Check for PCI bus parity errors: 0=off 1=on");
 763module_param(edac_pci_panic_on_pe, int, 0644);
 764MODULE_PARM_DESC(edac_pci_panic_on_pe,
 765                 "Panic on PCI Bus Parity error: 0=off 1=on");
 766
 767#endif                          /* CONFIG_PCI */
 768