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/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/* Turn off this whole feature if PCI is not configured */
  18#ifdef CONFIG_PCI
  19
  20#define EDAC_PCI_SYMLINK        "device"
  21
  22/* data variables exported via sysfs */
  23static int check_pci_errors;            /* default NO check PCI parity */
  24static int edac_pci_panic_on_pe;        /* default NO panic on PCI Parity */
  25static int edac_pci_log_pe = 1;         /* log PCI parity errors */
  26static int edac_pci_log_npe = 1;        /* log PCI non-parity error errors */
  27static int edac_pci_poll_msec = 1000;   /* one second workq period */
  28
  29static atomic_t pci_parity_count = ATOMIC_INIT(0);
  30static atomic_t pci_nonparity_count = ATOMIC_INIT(0);
  31
  32static struct kobject *edac_pci_top_main_kobj;
  33static atomic_t edac_pci_sysfs_refcount = ATOMIC_INIT(0);
  34
  35/* getter functions for the data variables */
  36int edac_pci_get_check_errors(void)
  37{
  38        return check_pci_errors;
  39}
  40
  41static int edac_pci_get_log_pe(void)
  42{
  43        return edac_pci_log_pe;
  44}
  45
  46static int edac_pci_get_log_npe(void)
  47{
  48        return edac_pci_log_npe;
  49}
  50
  51static int edac_pci_get_panic_on_pe(void)
  52{
  53        return edac_pci_panic_on_pe;
  54}
  55
  56int edac_pci_get_poll_msec(void)
  57{
  58        return edac_pci_poll_msec;
  59}
  60
  61/**************************** EDAC PCI sysfs instance *******************/
  62static ssize_t instance_pe_count_show(struct edac_pci_ctl_info *pci, char *data)
  63{
  64        return sprintf(data, "%u\n", atomic_read(&pci->counters.pe_count));
  65}
  66
  67static ssize_t instance_npe_count_show(struct edac_pci_ctl_info *pci,
  68                                char *data)
  69{
  70        return sprintf(data, "%u\n", atomic_read(&pci->counters.npe_count));
  71}
  72
  73#define to_instance(k) container_of(k, struct edac_pci_ctl_info, kobj)
  74#define to_instance_attr(a) container_of(a, struct instance_attribute, attr)
  75
  76/* DEVICE instance kobject release() function */
  77static void edac_pci_instance_release(struct kobject *kobj)
  78{
  79        struct edac_pci_ctl_info *pci;
  80
  81        edac_dbg(0, "\n");
  82
  83        /* Form pointer to containing struct, the pci control struct */
  84        pci = to_instance(kobj);
  85
  86        /* decrement reference count on top main kobj */
  87        kobject_put(edac_pci_top_main_kobj);
  88
  89        kfree(pci);     /* Free the control struct */
  90}
  91
  92/* instance specific attribute structure */
  93struct instance_attribute {
  94        struct attribute attr;
  95        ssize_t(*show) (struct edac_pci_ctl_info *, char *);
  96        ssize_t(*store) (struct edac_pci_ctl_info *, const char *, size_t);
  97};
  98
  99/* Function to 'show' fields from the edac_pci 'instance' structure */
 100static ssize_t edac_pci_instance_show(struct kobject *kobj,
 101                                struct attribute *attr, char *buffer)
 102{
 103        struct edac_pci_ctl_info *pci = to_instance(kobj);
 104        struct instance_attribute *instance_attr = to_instance_attr(attr);
 105
 106        if (instance_attr->show)
 107                return instance_attr->show(pci, buffer);
 108        return -EIO;
 109}
 110
 111/* Function to 'store' fields into the edac_pci 'instance' structure */
 112static ssize_t edac_pci_instance_store(struct kobject *kobj,
 113                                struct attribute *attr,
 114                                const char *buffer, size_t count)
 115{
 116        struct edac_pci_ctl_info *pci = to_instance(kobj);
 117        struct instance_attribute *instance_attr = to_instance_attr(attr);
 118
 119        if (instance_attr->store)
 120                return instance_attr->store(pci, buffer, count);
 121        return -EIO;
 122}
 123
 124/* fs_ops table */
 125static const struct sysfs_ops pci_instance_ops = {
 126        .show = edac_pci_instance_show,
 127        .store = edac_pci_instance_store
 128};
 129
 130#define INSTANCE_ATTR(_name, _mode, _show, _store)      \
 131static struct instance_attribute attr_instance_##_name = {      \
 132        .attr   = {.name = __stringify(_name), .mode = _mode }, \
 133        .show   = _show,                                        \
 134        .store  = _store,                                       \
 135};
 136
 137INSTANCE_ATTR(pe_count, S_IRUGO, instance_pe_count_show, NULL);
 138INSTANCE_ATTR(npe_count, S_IRUGO, instance_npe_count_show, NULL);
 139
 140/* pci instance attributes */
 141static struct instance_attribute *pci_instance_attr[] = {
 142        &attr_instance_pe_count,
 143        &attr_instance_npe_count,
 144        NULL
 145};
 146
 147/* the ktype for a pci instance */
 148static struct kobj_type ktype_pci_instance = {
 149        .release = edac_pci_instance_release,
 150        .sysfs_ops = &pci_instance_ops,
 151        .default_attrs = (struct attribute **)pci_instance_attr,
 152};
 153
 154/*
 155 * edac_pci_create_instance_kobj
 156 *
 157 *      construct one EDAC PCI instance's kobject for use
 158 */
 159static int edac_pci_create_instance_kobj(struct edac_pci_ctl_info *pci, int idx)
 160{
 161        struct kobject *main_kobj;
 162        int err;
 163
 164        edac_dbg(0, "\n");
 165
 166        /* First bump the ref count on the top main kobj, which will
 167         * track the number of PCI instances we have, and thus nest
 168         * properly on keeping the module loaded
 169         */
 170        main_kobj = kobject_get(edac_pci_top_main_kobj);
 171        if (!main_kobj) {
 172                err = -ENODEV;
 173                goto error_out;
 174        }
 175
 176        /* And now register this new kobject under the main kobj */
 177        err = kobject_init_and_add(&pci->kobj, &ktype_pci_instance,
 178                                   edac_pci_top_main_kobj, "pci%d", idx);
 179        if (err != 0) {
 180                edac_dbg(2, "failed to register instance pci%d\n", idx);
 181                kobject_put(edac_pci_top_main_kobj);
 182                goto error_out;
 183        }
 184
 185        kobject_uevent(&pci->kobj, KOBJ_ADD);
 186        edac_dbg(1, "Register instance 'pci%d' kobject\n", 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        edac_dbg(0, "\n");
 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->store)
 260                return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
 261        return -EIO;
 262}
 263
 264static const 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        edac_dbg(0, "here to module_put(THIS_MODULE)\n");
 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_subsys has already been initialized
 341 */
 342static int edac_pci_main_kobj_setup(void)
 343{
 344        int err;
 345        struct bus_type *edac_subsys;
 346
 347        edac_dbg(0, "\n");
 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 attributes
 355         */
 356        edac_subsys = edac_get_sysfs_subsys();
 357        if (edac_subsys == NULL) {
 358                edac_dbg(1, "no edac_subsys\n");
 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                edac_dbg(1, "try_module_get() failed\n");
 369                err = -ENODEV;
 370                goto mod_get_fail;
 371        }
 372
 373        edac_pci_top_main_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
 374        if (!edac_pci_top_main_kobj) {
 375                edac_dbg(1, "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_subsys->dev_root->kobj, "pci");
 384        if (err) {
 385                edac_dbg(1, "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        edac_dbg(1, "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
 405mod_get_fail:
 406        edac_put_sysfs_subsys();
 407
 408decrement_count_fail:
 409        /* if are on this error exit, nothing to tear down */
 410        atomic_dec(&edac_pci_sysfs_refcount);
 411
 412        return err;
 413}
 414
 415/*
 416 * edac_pci_main_kobj_teardown()
 417 *
 418 *      if no longer linked (needed) remove the top level EDAC PCI
 419 *      kobject with its controls and attributes
 420 */
 421static void edac_pci_main_kobj_teardown(void)
 422{
 423        edac_dbg(0, "\n");
 424
 425        /* Decrement the count and only if no more controller instances
 426         * are connected perform the unregisteration of the top level
 427         * main kobj
 428         */
 429        if (atomic_dec_return(&edac_pci_sysfs_refcount) == 0) {
 430                edac_dbg(0, "called kobject_put on main kobj\n");
 431                kobject_put(edac_pci_top_main_kobj);
 432        }
 433        edac_put_sysfs_subsys();
 434}
 435
 436/*
 437 *
 438 * edac_pci_create_sysfs
 439 *
 440 *      Create the controls/attributes for the specified EDAC PCI device
 441 */
 442int edac_pci_create_sysfs(struct edac_pci_ctl_info *pci)
 443{
 444        int err;
 445        struct kobject *edac_kobj = &pci->kobj;
 446
 447        edac_dbg(0, "idx=%d\n", pci->pci_idx);
 448
 449        /* create the top main EDAC PCI kobject, IF needed */
 450        err = edac_pci_main_kobj_setup();
 451        if (err)
 452                return err;
 453
 454        /* Create this instance's kobject under the MAIN kobject */
 455        err = edac_pci_create_instance_kobj(pci, pci->pci_idx);
 456        if (err)
 457                goto unregister_cleanup;
 458
 459        err = sysfs_create_link(edac_kobj, &pci->dev->kobj, EDAC_PCI_SYMLINK);
 460        if (err) {
 461                edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
 462                goto symlink_fail;
 463        }
 464
 465        return 0;
 466
 467        /* Error unwind stack */
 468symlink_fail:
 469        edac_pci_unregister_sysfs_instance_kobj(pci);
 470
 471unregister_cleanup:
 472        edac_pci_main_kobj_teardown();
 473
 474        return err;
 475}
 476
 477/*
 478 * edac_pci_remove_sysfs
 479 *
 480 *      remove the controls and attributes for this EDAC PCI device
 481 */
 482void edac_pci_remove_sysfs(struct edac_pci_ctl_info *pci)
 483{
 484        edac_dbg(0, "index=%d\n", pci->pci_idx);
 485
 486        /* Remove the symlink */
 487        sysfs_remove_link(&pci->kobj, EDAC_PCI_SYMLINK);
 488
 489        /* remove this PCI instance's sysfs entries */
 490        edac_pci_unregister_sysfs_instance_kobj(pci);
 491
 492        /* Call the main unregister function, which will determine
 493         * if this 'pci' is the last instance.
 494         * If it is, the main kobject will be unregistered as a result
 495         */
 496        edac_dbg(0, "calling edac_pci_main_kobj_teardown()\n");
 497        edac_pci_main_kobj_teardown();
 498}
 499
 500/************************ PCI error handling *************************/
 501static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
 502{
 503        int where;
 504        u16 status;
 505
 506        where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
 507        pci_read_config_word(dev, where, &status);
 508
 509        /* If we get back 0xFFFF then we must suspect that the card has been
 510         * pulled but the Linux PCI layer has not yet finished cleaning up.
 511         * We don't want to report on such devices
 512         */
 513
 514        if (status == 0xFFFF) {
 515                u32 sanity;
 516
 517                pci_read_config_dword(dev, 0, &sanity);
 518
 519                if (sanity == 0xFFFFFFFF)
 520                        return 0;
 521        }
 522
 523        status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
 524                PCI_STATUS_PARITY;
 525
 526        if (status)
 527                /* reset only the bits we are interested in */
 528                pci_write_config_word(dev, where, status);
 529
 530        return status;
 531}
 532
 533
 534/* Clear any PCI parity errors logged by this device. */
 535static void edac_pci_dev_parity_clear(struct pci_dev *dev)
 536{
 537        u8 header_type;
 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 *      Function 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        edac_dbg(4, "PCI STATUS= 0x%04x %s\n", status, dev_name(&dev->dev));
 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        edac_dbg(4, "PCI HEADER TYPE= 0x%02x %s\n",
 604                 header_type, dev_name(&dev->dev));
 605
 606        if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
 607                /* On bridges, need to examine secondary status register  */
 608                status = get_pci_parity_status(dev, 1);
 609
 610                edac_dbg(4, "PCI SEC_STATUS= 0x%04x %s\n",
 611                         status, dev_name(&dev->dev));
 612
 613                /* check the secondary status reg for errors,
 614                 * on NOT broken boards
 615                 */
 616                if (status && !dev->broken_parity_status) {
 617                        if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) {
 618                                edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 619                                        "Signaled System Error on %s\n",
 620                                        pci_name(dev));
 621                                atomic_inc(&pci_nonparity_count);
 622                        }
 623
 624                        if (status & (PCI_STATUS_PARITY)) {
 625                                edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 626                                        "Master Data Parity Error on "
 627                                        "%s\n", pci_name(dev));
 628
 629                                atomic_inc(&pci_parity_count);
 630                        }
 631
 632                        if (status & (PCI_STATUS_DETECTED_PARITY)) {
 633                                edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
 634                                        "Detected Parity Error on %s\n",
 635                                        pci_name(dev));
 636
 637                                atomic_inc(&pci_parity_count);
 638                        }
 639                }
 640        }
 641}
 642
 643/* reduce some complexity in definition of the iterator */
 644typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
 645
 646/*
 647 * pci_dev parity list iterator
 648 *
 649 *      Scan the PCI device list looking for SERRORs, Master Parity ERRORS or
 650 *      Parity ERRORs on primary or secondary devices.
 651 */
 652static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
 653{
 654        struct pci_dev *dev = NULL;
 655
 656        for_each_pci_dev(dev)
 657                fn(dev);
 658}
 659
 660/*
 661 * edac_pci_do_parity_check
 662 *
 663 *      performs the actual PCI parity check operation
 664 */
 665void edac_pci_do_parity_check(void)
 666{
 667        int before_count;
 668
 669        edac_dbg(3, "\n");
 670
 671        /* if policy has PCI check off, leave now */
 672        if (!check_pci_errors)
 673                return;
 674
 675        before_count = atomic_read(&pci_parity_count);
 676
 677        /* scan all PCI devices looking for a Parity Error on devices and
 678         * bridges.
 679         * The iterator calls pci_get_device() which might sleep, thus
 680         * we cannot disable interrupts in this scan.
 681         */
 682        edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
 683
 684        /* Only if operator has selected panic on PCI Error */
 685        if (edac_pci_get_panic_on_pe()) {
 686                /* If the count is different 'after' from 'before' */
 687                if (before_count != atomic_read(&pci_parity_count))
 688                        panic("EDAC: PCI Parity Error");
 689        }
 690}
 691
 692/*
 693 * edac_pci_clear_parity_errors
 694 *
 695 *      function to perform an iteration over the PCI devices
 696 *      and clearn their current status
 697 */
 698void edac_pci_clear_parity_errors(void)
 699{
 700        /* Clear any PCI bus parity errors that devices initially have logged
 701         * in their registers.
 702         */
 703        edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
 704}
 705
 706/*
 707 * edac_pci_handle_pe
 708 *
 709 *      Called to handle a PARITY ERROR event
 710 */
 711void edac_pci_handle_pe(struct edac_pci_ctl_info *pci, const char *msg)
 712{
 713
 714        /* global PE counter incremented by edac_pci_do_parity_check() */
 715        atomic_inc(&pci->counters.pe_count);
 716
 717        if (edac_pci_get_log_pe())
 718                edac_pci_printk(pci, KERN_WARNING,
 719                                "Parity Error ctl: %s %d: %s\n",
 720                                pci->ctl_name, pci->pci_idx, msg);
 721
 722        /*
 723         * poke all PCI devices and see which one is the troublemaker
 724         * panic() is called if set
 725         */
 726        edac_pci_do_parity_check();
 727}
 728EXPORT_SYMBOL_GPL(edac_pci_handle_pe);
 729
 730
 731/*
 732 * edac_pci_handle_npe
 733 *
 734 *      Called to handle a NON-PARITY ERROR event
 735 */
 736void edac_pci_handle_npe(struct edac_pci_ctl_info *pci, const char *msg)
 737{
 738
 739        /* global NPE counter incremented by edac_pci_do_parity_check() */
 740        atomic_inc(&pci->counters.npe_count);
 741
 742        if (edac_pci_get_log_npe())
 743                edac_pci_printk(pci, KERN_WARNING,
 744                                "Non-Parity Error ctl: %s %d: %s\n",
 745                                pci->ctl_name, pci->pci_idx, msg);
 746
 747        /*
 748         * poke all PCI devices and see which one is the troublemaker
 749         * panic() is called if set
 750         */
 751        edac_pci_do_parity_check();
 752}
 753EXPORT_SYMBOL_GPL(edac_pci_handle_npe);
 754
 755/*
 756 * Define the PCI parameter to the module
 757 */
 758module_param(check_pci_errors, int, 0644);
 759MODULE_PARM_DESC(check_pci_errors,
 760                 "Check for PCI bus parity errors: 0=off 1=on");
 761module_param(edac_pci_panic_on_pe, int, 0644);
 762MODULE_PARM_DESC(edac_pci_panic_on_pe,
 763                 "Panic on PCI Bus Parity error: 0=off 1=on");
 764
 765#endif                          /* CONFIG_PCI */
 766
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