drivers/edac/edac_device_sysfs.c

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