linux/drivers/edac/edac_device_sysfs.c
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   1/*
   2 * file for managing the edac_device subsystem of devices for EDAC
   3 *
   4 * (C) 2007 SoftwareBitMaker 
   5 *
   6 * This file may be distributed under the terms of the
   7 * GNU General Public License.
   8 *
   9 * Written Doug Thompson <norsk5@xmission.com>
  10 *
  11 */
  12
  13#include <linux/ctype.h>
  14#include <linux/module.h>
  15#include <linux/slab.h>
  16#include <linux/edac.h>
  17
  18#include "edac_core.h"
  19#include "edac_module.h"
  20
  21#define EDAC_DEVICE_SYMLINK     "device"
  22
  23#define to_edacdev(k) container_of(k, struct edac_device_ctl_info, kobj)
  24#define to_edacdev_attr(a) container_of(a, struct edacdev_attribute, attr)
  25
  26
  27/*
  28 * Set of edac_device_ctl_info attribute store/show functions
  29 */
  30
  31/* 'log_ue' */
  32static ssize_t edac_device_ctl_log_ue_show(struct edac_device_ctl_info
  33                                        *ctl_info, char *data)
  34{
  35        return sprintf(data, "%u\n", ctl_info->log_ue);
  36}
  37
  38static ssize_t edac_device_ctl_log_ue_store(struct edac_device_ctl_info
  39                                        *ctl_info, const char *data,
  40                                        size_t count)
  41{
  42        /* if parameter is zero, turn off flag, if non-zero turn on flag */
  43        ctl_info->log_ue = (simple_strtoul(data, NULL, 0) != 0);
  44
  45        return count;
  46}
  47
  48/* 'log_ce' */
  49static ssize_t edac_device_ctl_log_ce_show(struct edac_device_ctl_info
  50                                        *ctl_info, char *data)
  51{
  52        return sprintf(data, "%u\n", ctl_info->log_ce);
  53}
  54
  55static ssize_t edac_device_ctl_log_ce_store(struct edac_device_ctl_info
  56                                        *ctl_info, const char *data,
  57                                        size_t count)
  58{
  59        /* if parameter is zero, turn off flag, if non-zero turn on flag */
  60        ctl_info->log_ce = (simple_strtoul(data, NULL, 0) != 0);
  61
  62        return count;
  63}
  64
  65/* 'panic_on_ue' */
  66static ssize_t edac_device_ctl_panic_on_ue_show(struct edac_device_ctl_info
  67                                                *ctl_info, char *data)
  68{
  69        return sprintf(data, "%u\n", ctl_info->panic_on_ue);
  70}
  71
  72static ssize_t edac_device_ctl_panic_on_ue_store(struct edac_device_ctl_info
  73                                                 *ctl_info, const char *data,
  74                                                 size_t count)
  75{
  76        /* if parameter is zero, turn off flag, if non-zero turn on flag */
  77        ctl_info->panic_on_ue = (simple_strtoul(data, NULL, 0) != 0);
  78
  79        return count;
  80}
  81
  82/* 'poll_msec' show and store functions*/
  83static ssize_t edac_device_ctl_poll_msec_show(struct edac_device_ctl_info
  84                                        *ctl_info, char *data)
  85{
  86        return sprintf(data, "%u\n", ctl_info->poll_msec);
  87}
  88
  89static ssize_t edac_device_ctl_poll_msec_store(struct edac_device_ctl_info
  90                                        *ctl_info, const char *data,
  91                                        size_t count)
  92{
  93        unsigned long value;
  94
  95        /* get the value and enforce that it is non-zero, must be at least
  96         * one millisecond for the delay period, between scans
  97         * Then cancel last outstanding delay for the work request
  98         * and set a new one.
  99         */
 100        value = simple_strtoul(data, NULL, 0);
 101        edac_device_reset_delay_period(ctl_info, value);
 102
 103        return count;
 104}
 105
 106/* edac_device_ctl_info specific attribute structure */
 107struct ctl_info_attribute {
 108        struct attribute attr;
 109        ssize_t(*show) (struct edac_device_ctl_info *, char *);
 110        ssize_t(*store) (struct edac_device_ctl_info *, const char *, size_t);
 111};
 112
 113#define to_ctl_info(k) container_of(k, struct edac_device_ctl_info, kobj)
 114#define to_ctl_info_attr(a) container_of(a,struct ctl_info_attribute,attr)
 115
 116/* Function to 'show' fields from the edac_dev 'ctl_info' structure */
 117static ssize_t edac_dev_ctl_info_show(struct kobject *kobj,
 118                                struct attribute *attr, char *buffer)
 119{
 120        struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
 121        struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
 122
 123        if (ctl_info_attr->show)
 124                return ctl_info_attr->show(edac_dev, buffer);
 125        return -EIO;
 126}
 127
 128/* Function to 'store' fields into the edac_dev 'ctl_info' structure */
 129static ssize_t edac_dev_ctl_info_store(struct kobject *kobj,
 130                                struct attribute *attr,
 131                                const char *buffer, size_t count)
 132{
 133        struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
 134        struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
 135
 136        if (ctl_info_attr->store)
 137                return ctl_info_attr->store(edac_dev, buffer, count);
 138        return -EIO;
 139}
 140
 141/* edac_dev file operations for an 'ctl_info' */
 142static const struct sysfs_ops device_ctl_info_ops = {
 143        .show = edac_dev_ctl_info_show,
 144        .store = edac_dev_ctl_info_store
 145};
 146
 147#define CTL_INFO_ATTR(_name,_mode,_show,_store)        \
 148static struct ctl_info_attribute attr_ctl_info_##_name = {      \
 149        .attr = {.name = __stringify(_name), .mode = _mode },   \
 150        .show   = _show,                                        \
 151        .store  = _store,                                       \
 152};
 153
 154/* Declare the various ctl_info attributes here and their respective ops */
 155CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
 156        edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
 157CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
 158        edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
 159CTL_INFO_ATTR(panic_on_ue, S_IRUGO | S_IWUSR,
 160        edac_device_ctl_panic_on_ue_show,
 161        edac_device_ctl_panic_on_ue_store);
 162CTL_INFO_ATTR(poll_msec, S_IRUGO | S_IWUSR,
 163        edac_device_ctl_poll_msec_show, edac_device_ctl_poll_msec_store);
 164
 165/* Base Attributes of the EDAC_DEVICE ECC object */
 166static struct ctl_info_attribute *device_ctrl_attr[] = {
 167        &attr_ctl_info_panic_on_ue,
 168        &attr_ctl_info_log_ue,
 169        &attr_ctl_info_log_ce,
 170        &attr_ctl_info_poll_msec,
 171        NULL,
 172};
 173
 174/*
 175 * edac_device_ctrl_master_release
 176 *
 177 *      called when the reference count for the 'main' kobj
 178 *      for a edac_device control struct reaches zero
 179 *
 180 *      Reference count model:
 181 *              One 'main' kobject for each control structure allocated.
 182 *              That main kobj is initially set to one AND
 183 *              the reference count for the EDAC 'core' module is
 184 *              bumped by one, thus added 'keep in memory' dependency.
 185 *
 186 *              Each new internal kobj (in instances and blocks) then
 187 *              bumps the 'main' kobject.
 188 *
 189 *              When they are released their release functions decrement
 190 *              the 'main' kobj.
 191 *
 192 *              When the main kobj reaches zero (0) then THIS function
 193 *              is called which then decrements the EDAC 'core' module.
 194 *              When the module reference count reaches zero then the
 195 *              module no longer has dependency on keeping the release
 196 *              function code in memory and module can be unloaded.
 197 *
 198 *              This will support several control objects as well, each
 199 *              with its own 'main' kobj.
 200 */
 201static void edac_device_ctrl_master_release(struct kobject *kobj)
 202{
 203        struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
 204
 205        edac_dbg(4, "control index=%d\n", edac_dev->dev_idx);
 206
 207        /* decrement the EDAC CORE module ref count */
 208        module_put(edac_dev->owner);
 209
 210        /* free the control struct containing the 'main' kobj
 211         * passed in to this routine
 212         */
 213        kfree(edac_dev);
 214}
 215
 216/* ktype for the main (master) kobject */
 217static struct kobj_type ktype_device_ctrl = {
 218        .release = edac_device_ctrl_master_release,
 219        .sysfs_ops = &device_ctl_info_ops,
 220        .default_attrs = (struct attribute **)device_ctrl_attr,
 221};
 222
 223/*
 224 * edac_device_register_sysfs_main_kobj
 225 *
 226 *      perform the high level setup for the new edac_device instance
 227 *
 228 * Return:  0 SUCCESS
 229 *         !0 FAILURE
 230 */
 231int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 232{
 233        struct bus_type *edac_subsys;
 234        int err;
 235
 236        edac_dbg(1, "\n");
 237
 238        /* get the /sys/devices/system/edac reference */
 239        edac_subsys = edac_get_sysfs_subsys();
 240        if (edac_subsys == NULL) {
 241                edac_dbg(1, "no edac_subsys error\n");
 242                err = -ENODEV;
 243                goto err_out;
 244        }
 245
 246        /* Point to the 'edac_subsys' this instance 'reports' to */
 247        edac_dev->edac_subsys = edac_subsys;
 248
 249        /* Init the devices's kobject */
 250        memset(&edac_dev->kobj, 0, sizeof(struct kobject));
 251
 252        /* Record which module 'owns' this control structure
 253         * and bump the ref count of the module
 254         */
 255        edac_dev->owner = THIS_MODULE;
 256
 257        if (!try_module_get(edac_dev->owner)) {
 258                err = -ENODEV;
 259                goto err_mod_get;
 260        }
 261
 262        /* register */
 263        err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
 264                                   &edac_subsys->dev_root->kobj,
 265                                   "%s", edac_dev->name);
 266        if (err) {
 267                edac_dbg(1, "Failed to register '.../edac/%s'\n",
 268                         edac_dev->name);
 269                goto err_kobj_reg;
 270        }
 271        kobject_uevent(&edac_dev->kobj, KOBJ_ADD);
 272
 273        /* At this point, to 'free' the control struct,
 274         * edac_device_unregister_sysfs_main_kobj() must be used
 275         */
 276
 277        edac_dbg(4, "Registered '.../edac/%s' kobject\n", edac_dev->name);
 278
 279        return 0;
 280
 281        /* Error exit stack */
 282err_kobj_reg:
 283        module_put(edac_dev->owner);
 284
 285err_mod_get:
 286        edac_put_sysfs_subsys();
 287
 288err_out:
 289        return err;
 290}
 291
 292/*
 293 * edac_device_unregister_sysfs_main_kobj:
 294 *      the '..../edac/<name>' kobject
 295 */
 296void edac_device_unregister_sysfs_main_kobj(struct edac_device_ctl_info *dev)
 297{
 298        edac_dbg(0, "\n");
 299        edac_dbg(4, "name of kobject is: %s\n", kobject_name(&dev->kobj));
 300
 301        /*
 302         * Unregister the edac device's kobject and
 303         * allow for reference count to reach 0 at which point
 304         * the callback will be called to:
 305         *   a) module_put() this module
 306         *   b) 'kfree' the memory
 307         */
 308        kobject_put(&dev->kobj);
 309        edac_put_sysfs_subsys();
 310}
 311
 312/* edac_dev -> instance information */
 313
 314/*
 315 * Set of low-level instance attribute show functions
 316 */
 317static ssize_t instance_ue_count_show(struct edac_device_instance *instance,
 318                                char *data)
 319{
 320        return sprintf(data, "%u\n", instance->counters.ue_count);
 321}
 322
 323static ssize_t instance_ce_count_show(struct edac_device_instance *instance,
 324                                char *data)
 325{
 326        return sprintf(data, "%u\n", instance->counters.ce_count);
 327}
 328
 329#define to_instance(k) container_of(k, struct edac_device_instance, kobj)
 330#define to_instance_attr(a) container_of(a,struct instance_attribute,attr)
 331
 332/* DEVICE instance kobject release() function */
 333static void edac_device_ctrl_instance_release(struct kobject *kobj)
 334{
 335        struct edac_device_instance *instance;
 336
 337        edac_dbg(1, "\n");
 338
 339        /* map from this kobj to the main control struct
 340         * and then dec the main kobj count
 341         */
 342        instance = to_instance(kobj);
 343        kobject_put(&instance->ctl->kobj);
 344}
 345
 346/* instance specific attribute structure */
 347struct instance_attribute {
 348        struct attribute attr;
 349        ssize_t(*show) (struct edac_device_instance *, char *);
 350        ssize_t(*store) (struct edac_device_instance *, const char *, size_t);
 351};
 352
 353/* Function to 'show' fields from the edac_dev 'instance' structure */
 354static ssize_t edac_dev_instance_show(struct kobject *kobj,
 355                                struct attribute *attr, char *buffer)
 356{
 357        struct edac_device_instance *instance = to_instance(kobj);
 358        struct instance_attribute *instance_attr = to_instance_attr(attr);
 359
 360        if (instance_attr->show)
 361                return instance_attr->show(instance, buffer);
 362        return -EIO;
 363}
 364
 365/* Function to 'store' fields into the edac_dev 'instance' structure */
 366static ssize_t edac_dev_instance_store(struct kobject *kobj,
 367                                struct attribute *attr,
 368                                const char *buffer, size_t count)
 369{
 370        struct edac_device_instance *instance = to_instance(kobj);
 371        struct instance_attribute *instance_attr = to_instance_attr(attr);
 372
 373        if (instance_attr->store)
 374                return instance_attr->store(instance, buffer, count);
 375        return -EIO;
 376}
 377
 378/* edac_dev file operations for an 'instance' */
 379static const struct sysfs_ops device_instance_ops = {
 380        .show = edac_dev_instance_show,
 381        .store = edac_dev_instance_store
 382};
 383
 384#define INSTANCE_ATTR(_name,_mode,_show,_store)        \
 385static struct instance_attribute attr_instance_##_name = {      \
 386        .attr = {.name = __stringify(_name), .mode = _mode },   \
 387        .show   = _show,                                        \
 388        .store  = _store,                                       \
 389};
 390
 391/*
 392 * Define attributes visible for the edac_device instance object
 393 *      Each contains a pointer to a show and an optional set
 394 *      function pointer that does the low level output/input
 395 */
 396INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
 397INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);
 398
 399/* list of edac_dev 'instance' attributes */
 400static struct instance_attribute *device_instance_attr[] = {
 401        &attr_instance_ce_count,
 402        &attr_instance_ue_count,
 403        NULL,
 404};
 405
 406/* The 'ktype' for each edac_dev 'instance' */
 407static struct kobj_type ktype_instance_ctrl = {
 408        .release = edac_device_ctrl_instance_release,
 409        .sysfs_ops = &device_instance_ops,
 410        .default_attrs = (struct attribute **)device_instance_attr,
 411};
 412
 413/* edac_dev -> instance -> block information */
 414
 415#define to_block(k) container_of(k, struct edac_device_block, kobj)
 416#define to_block_attr(a) \
 417        container_of(a, struct edac_dev_sysfs_block_attribute, attr)
 418
 419/*
 420 * Set of low-level block attribute show functions
 421 */
 422static ssize_t block_ue_count_show(struct kobject *kobj,
 423                                        struct attribute *attr, char *data)
 424{
 425        struct edac_device_block *block = to_block(kobj);
 426
 427        return sprintf(data, "%u\n", block->counters.ue_count);
 428}
 429
 430static ssize_t block_ce_count_show(struct kobject *kobj,
 431                                        struct attribute *attr, char *data)
 432{
 433        struct edac_device_block *block = to_block(kobj);
 434
 435        return sprintf(data, "%u\n", block->counters.ce_count);
 436}
 437
 438/* DEVICE block kobject release() function */
 439static void edac_device_ctrl_block_release(struct kobject *kobj)
 440{
 441        struct edac_device_block *block;
 442
 443        edac_dbg(1, "\n");
 444
 445        /* get the container of the kobj */
 446        block = to_block(kobj);
 447
 448        /* map from 'block kobj' to 'block->instance->controller->main_kobj'
 449         * now 'release' the block kobject
 450         */
 451        kobject_put(&block->instance->ctl->kobj);
 452}
 453
 454
 455/* Function to 'show' fields from the edac_dev 'block' structure */
 456static ssize_t edac_dev_block_show(struct kobject *kobj,
 457                                struct attribute *attr, char *buffer)
 458{
 459        struct edac_dev_sysfs_block_attribute *block_attr =
 460                                                to_block_attr(attr);
 461
 462        if (block_attr->show)
 463                return block_attr->show(kobj, attr, buffer);
 464        return -EIO;
 465}
 466
 467/* Function to 'store' fields into the edac_dev 'block' structure */
 468static ssize_t edac_dev_block_store(struct kobject *kobj,
 469                                struct attribute *attr,
 470                                const char *buffer, size_t count)
 471{
 472        struct edac_dev_sysfs_block_attribute *block_attr;
 473
 474        block_attr = to_block_attr(attr);
 475
 476        if (block_attr->store)
 477                return block_attr->store(kobj, attr, buffer, count);
 478        return -EIO;
 479}
 480
 481/* edac_dev file operations for a 'block' */
 482static const struct sysfs_ops device_block_ops = {
 483        .show = edac_dev_block_show,
 484        .store = edac_dev_block_store
 485};
 486
 487#define BLOCK_ATTR(_name,_mode,_show,_store)        \
 488static struct edac_dev_sysfs_block_attribute attr_block_##_name = {     \
 489        .attr = {.name = __stringify(_name), .mode = _mode },   \
 490        .show   = _show,                                        \
 491        .store  = _store,                                       \
 492};
 493
 494BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
 495BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);
 496
 497/* list of edac_dev 'block' attributes */
 498static struct edac_dev_sysfs_block_attribute *device_block_attr[] = {
 499        &attr_block_ce_count,
 500        &attr_block_ue_count,
 501        NULL,
 502};
 503
 504/* The 'ktype' for each edac_dev 'block' */
 505static struct kobj_type ktype_block_ctrl = {
 506        .release = edac_device_ctrl_block_release,
 507        .sysfs_ops = &device_block_ops,
 508        .default_attrs = (struct attribute **)device_block_attr,
 509};
 510
 511/* block ctor/dtor  code */
 512
 513/*
 514 * edac_device_create_block
 515 */
 516static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
 517                                struct edac_device_instance *instance,
 518                                struct edac_device_block *block)
 519{
 520        int i;
 521        int err;
 522        struct edac_dev_sysfs_block_attribute *sysfs_attrib;
 523        struct kobject *main_kobj;
 524
 525        edac_dbg(4, "Instance '%s' inst_p=%p  block '%s'  block_p=%p\n",
 526                 instance->name, instance, block->name, block);
 527        edac_dbg(4, "block kobj=%p  block kobj->parent=%p\n",
 528                 &block->kobj, &block->kobj.parent);
 529
 530        /* init this block's kobject */
 531        memset(&block->kobj, 0, sizeof(struct kobject));
 532
 533        /* bump the main kobject's reference count for this controller
 534         * and this instance is dependent on the main
 535         */
 536        main_kobj = kobject_get(&edac_dev->kobj);
 537        if (!main_kobj) {
 538                err = -ENODEV;
 539                goto err_out;
 540        }
 541
 542        /* Add this block's kobject */
 543        err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
 544                                   &instance->kobj,
 545                                   "%s", block->name);
 546        if (err) {
 547                edac_dbg(1, "Failed to register instance '%s'\n", block->name);
 548                kobject_put(main_kobj);
 549                err = -ENODEV;
 550                goto err_out;
 551        }
 552
 553        /* If there are driver level block attributes, then added them
 554         * to the block kobject
 555         */
 556        sysfs_attrib = block->block_attributes;
 557        if (sysfs_attrib && block->nr_attribs) {
 558                for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
 559
 560                        edac_dbg(4, "creating block attrib='%s' attrib->%p to kobj=%p\n",
 561                                 sysfs_attrib->attr.name,
 562                                 sysfs_attrib, &block->kobj);
 563
 564                        /* Create each block_attribute file */
 565                        err = sysfs_create_file(&block->kobj,
 566                                &sysfs_attrib->attr);
 567                        if (err)
 568                                goto err_on_attrib;
 569                }
 570        }
 571        kobject_uevent(&block->kobj, KOBJ_ADD);
 572
 573        return 0;
 574
 575        /* Error unwind stack */
 576err_on_attrib:
 577        kobject_put(&block->kobj);
 578
 579err_out:
 580        return err;
 581}
 582
 583/*
 584 * edac_device_delete_block(edac_dev,block);
 585 */
 586static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
 587                                struct edac_device_block *block)
 588{
 589        struct edac_dev_sysfs_block_attribute *sysfs_attrib;
 590        int i;
 591
 592        /* if this block has 'attributes' then we need to iterate over the list
 593         * and 'remove' the attributes on this block
 594         */
 595        sysfs_attrib = block->block_attributes;
 596        if (sysfs_attrib && block->nr_attribs) {
 597                for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
 598
 599                        /* remove each block_attrib file */
 600                        sysfs_remove_file(&block->kobj,
 601                                (struct attribute *) sysfs_attrib);
 602                }
 603        }
 604
 605        /* unregister this block's kobject, SEE:
 606         *      edac_device_ctrl_block_release() callback operation
 607         */
 608        kobject_put(&block->kobj);
 609}
 610
 611/* instance ctor/dtor code */
 612
 613/*
 614 * edac_device_create_instance
 615 *      create just one instance of an edac_device 'instance'
 616 */
 617static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
 618                                int idx)
 619{
 620        int i, j;
 621        int err;
 622        struct edac_device_instance *instance;
 623        struct kobject *main_kobj;
 624
 625        instance = &edac_dev->instances[idx];
 626
 627        /* Init the instance's kobject */
 628        memset(&instance->kobj, 0, sizeof(struct kobject));
 629
 630        instance->ctl = edac_dev;
 631
 632        /* bump the main kobject's reference count for this controller
 633         * and this instance is dependent on the main
 634         */
 635        main_kobj = kobject_get(&edac_dev->kobj);
 636        if (!main_kobj) {
 637                err = -ENODEV;
 638                goto err_out;
 639        }
 640
 641        /* Formally register this instance's kobject under the edac_device */
 642        err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
 643                                   &edac_dev->kobj, "%s", instance->name);
 644        if (err != 0) {
 645                edac_dbg(2, "Failed to register instance '%s'\n",
 646                         instance->name);
 647                kobject_put(main_kobj);
 648                goto err_out;
 649        }
 650
 651        edac_dbg(4, "now register '%d' blocks for instance %d\n",
 652                 instance->nr_blocks, idx);
 653
 654        /* register all blocks of this instance */
 655        for (i = 0; i < instance->nr_blocks; i++) {
 656                err = edac_device_create_block(edac_dev, instance,
 657                                                &instance->blocks[i]);
 658                if (err) {
 659                        /* If any fail, remove all previous ones */
 660                        for (j = 0; j < i; j++)
 661                                edac_device_delete_block(edac_dev,
 662                                                        &instance->blocks[j]);
 663                        goto err_release_instance_kobj;
 664                }
 665        }
 666        kobject_uevent(&instance->kobj, KOBJ_ADD);
 667
 668        edac_dbg(4, "Registered instance %d '%s' kobject\n",
 669                 idx, instance->name);
 670
 671        return 0;
 672
 673        /* error unwind stack */
 674err_release_instance_kobj:
 675        kobject_put(&instance->kobj);
 676
 677err_out:
 678        return err;
 679}
 680
 681/*
 682 * edac_device_remove_instance
 683 *      remove an edac_device instance
 684 */
 685static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
 686                                        int idx)
 687{
 688        struct edac_device_instance *instance;
 689        int i;
 690
 691        instance = &edac_dev->instances[idx];
 692
 693        /* unregister all blocks in this instance */
 694        for (i = 0; i < instance->nr_blocks; i++)
 695                edac_device_delete_block(edac_dev, &instance->blocks[i]);
 696
 697        /* unregister this instance's kobject, SEE:
 698         *      edac_device_ctrl_instance_release() for callback operation
 699         */
 700        kobject_put(&instance->kobj);
 701}
 702
 703/*
 704 * edac_device_create_instances
 705 *      create the first level of 'instances' for this device
 706 *      (ie  'cache' might have 'cache0', 'cache1', 'cache2', etc
 707 */
 708static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
 709{
 710        int i, j;
 711        int err;
 712
 713        edac_dbg(0, "\n");
 714
 715        /* iterate over creation of the instances */
 716        for (i = 0; i < edac_dev->nr_instances; i++) {
 717                err = edac_device_create_instance(edac_dev, i);
 718                if (err) {
 719                        /* unwind previous instances on error */
 720                        for (j = 0; j < i; j++)
 721                                edac_device_delete_instance(edac_dev, j);
 722                        return err;
 723                }
 724        }
 725
 726        return 0;
 727}
 728
 729/*
 730 * edac_device_delete_instances(edac_dev);
 731 *      unregister all the kobjects of the instances
 732 */
 733static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
 734{
 735        int i;
 736
 737        /* iterate over creation of the instances */
 738        for (i = 0; i < edac_dev->nr_instances; i++)
 739                edac_device_delete_instance(edac_dev, i);
 740}
 741
 742/* edac_dev sysfs ctor/dtor  code */
 743
 744/*
 745 * edac_device_add_main_sysfs_attributes
 746 *      add some attributes to this instance's main kobject
 747 */
 748static int edac_device_add_main_sysfs_attributes(
 749                        struct edac_device_ctl_info *edac_dev)
 750{
 751        struct edac_dev_sysfs_attribute *sysfs_attrib;
 752        int err = 0;
 753
 754        sysfs_attrib = edac_dev->sysfs_attributes;
 755        if (sysfs_attrib) {
 756                /* iterate over the array and create an attribute for each
 757                 * entry in the list
 758                 */
 759                while (sysfs_attrib->attr.name != NULL) {
 760                        err = sysfs_create_file(&edac_dev->kobj,
 761                                (struct attribute*) sysfs_attrib);
 762                        if (err)
 763                                goto err_out;
 764
 765                        sysfs_attrib++;
 766                }
 767        }
 768
 769err_out:
 770        return err;
 771}
 772
 773/*
 774 * edac_device_remove_main_sysfs_attributes
 775 *      remove any attributes to this instance's main kobject
 776 */
 777static void edac_device_remove_main_sysfs_attributes(
 778                        struct edac_device_ctl_info *edac_dev)
 779{
 780        struct edac_dev_sysfs_attribute *sysfs_attrib;
 781
 782        /* if there are main attributes, defined, remove them. First,
 783         * point to the start of the array and iterate over it
 784         * removing each attribute listed from this device's instance's kobject
 785         */
 786        sysfs_attrib = edac_dev->sysfs_attributes;
 787        if (sysfs_attrib) {
 788                while (sysfs_attrib->attr.name != NULL) {
 789                        sysfs_remove_file(&edac_dev->kobj,
 790                                        (struct attribute *) sysfs_attrib);
 791                        sysfs_attrib++;
 792                }
 793        }
 794}
 795
 796/*
 797 * edac_device_create_sysfs() Constructor
 798 *
 799 * accept a created edac_device control structure
 800 * and 'export' it to sysfs. The 'main' kobj should already have been
 801 * created. 'instance' and 'block' kobjects should be registered
 802 * along with any 'block' attributes from the low driver. In addition,
 803 * the main attributes (if any) are connected to the main kobject of
 804 * the control structure.
 805 *
 806 * Return:
 807 *      0       Success
 808 *      !0      Failure
 809 */
 810int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
 811{
 812        int err;
 813        struct kobject *edac_kobj = &edac_dev->kobj;
 814
 815        edac_dbg(0, "idx=%d\n", edac_dev->dev_idx);
 816
 817        /*  go create any main attributes callers wants */
 818        err = edac_device_add_main_sysfs_attributes(edac_dev);
 819        if (err) {
 820                edac_dbg(0, "failed to add sysfs attribs\n");
 821                goto err_out;
 822        }
 823
 824        /* create a symlink from the edac device
 825         * to the platform 'device' being used for this
 826         */
 827        err = sysfs_create_link(edac_kobj,
 828                                &edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
 829        if (err) {
 830                edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
 831                goto err_remove_main_attribs;
 832        }
 833
 834        /* Create the first level instance directories
 835         * In turn, the nested blocks beneath the instances will
 836         * be registered as well
 837         */
 838        err = edac_device_create_instances(edac_dev);
 839        if (err) {
 840                edac_dbg(0, "edac_device_create_instances() returned err= %d\n",
 841                         err);
 842                goto err_remove_link;
 843        }
 844
 845
 846        edac_dbg(4, "create-instances done, idx=%d\n", edac_dev->dev_idx);
 847
 848        return 0;
 849
 850        /* Error unwind stack */
 851err_remove_link:
 852        /* remove the sym link */
 853        sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);
 854
 855err_remove_main_attribs:
 856        edac_device_remove_main_sysfs_attributes(edac_dev);
 857
 858err_out:
 859        return err;
 860}
 861
 862/*
 863 * edac_device_remove_sysfs() destructor
 864 *
 865 * given an edac_device struct, tear down the kobject resources
 866 */
 867void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev)
 868{
 869        edac_dbg(0, "\n");
 870
 871        /* remove any main attributes for this device */
 872        edac_device_remove_main_sysfs_attributes(edac_dev);
 873
 874        /* remove the device sym link */
 875        sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);
 876
 877        /* walk the instance/block kobject tree, deconstructing it */
 878        edac_device_delete_instances(edac_dev);
 879}
 880
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