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 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 */ 201 static 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 */ 217 static 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 */ 231 int 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(); 240 241 /* Point to the 'edac_subsys' this instance 'reports' to */ 242 edac_dev->edac_subsys = edac_subsys; 243 244 /* Init the devices's kobject */ 245 memset(&edac_dev->kobj, 0, sizeof(struct kobject)); 246 247 /* Record which module 'owns' this control structure 248 * and bump the ref count of the module 249 */ 250 edac_dev->owner = THIS_MODULE; 251 252 if (!try_module_get(edac_dev->owner)) { 253 err = -ENODEV; 254 goto err_out; 255 } 256 257 /* register */ 258 err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl, 259 &edac_subsys->dev_root->kobj, 260 "%s", edac_dev->name); 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 instance_attribute *device_instance_attr[] = { 393 &attr_instance_ce_count, 394 &attr_instance_ue_count, 395 NULL, 396 }; 397 398 /* The 'ktype' for each edac_dev 'instance' */ 399 static struct kobj_type ktype_instance_ctrl = { 400 .release = edac_device_ctrl_instance_release, 401 .sysfs_ops = &device_instance_ops, 402 .default_attrs = (struct attribute **)device_instance_attr, 403 }; 404 405 /* edac_dev -> instance -> block information */ 406 407 #define to_block(k) container_of(k, struct edac_device_block, kobj) 408 #define to_block_attr(a) \ 409 container_of(a, struct edac_dev_sysfs_block_attribute, attr) 410 411 /* 412 * Set of low-level block attribute show functions 413 */ 414 static ssize_t block_ue_count_show(struct kobject *kobj, 415 struct attribute *attr, char *data) 416 { 417 struct edac_device_block *block = to_block(kobj); 418 419 return sprintf(data, "%u\n", block->counters.ue_count); 420 } 421 422 static ssize_t block_ce_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.ce_count); 428 } 429 430 /* DEVICE block kobject release() function */ 431 static void edac_device_ctrl_block_release(struct kobject *kobj) 432 { 433 struct edac_device_block *block; 434 435 edac_dbg(1, "\n"); 436 437 /* get the container of the kobj */ 438 block = to_block(kobj); 439 440 /* map from 'block kobj' to 'block->instance->controller->main_kobj' 441 * now 'release' the block kobject 442 */ 443 kobject_put(&block->instance->ctl->kobj); 444 } 445 446 447 /* Function to 'show' fields from the edac_dev 'block' structure */ 448 static ssize_t edac_dev_block_show(struct kobject *kobj, 449 struct attribute *attr, char *buffer) 450 { 451 struct edac_dev_sysfs_block_attribute *block_attr = 452 to_block_attr(attr); 453 454 if (block_attr->show) 455 return block_attr->show(kobj, attr, buffer); 456 return -EIO; 457 } 458 459 /* Function to 'store' fields into the edac_dev 'block' structure */ 460 static ssize_t edac_dev_block_store(struct kobject *kobj, 461 struct attribute *attr, 462 const char *buffer, size_t count) 463 { 464 struct edac_dev_sysfs_block_attribute *block_attr; 465 466 block_attr = to_block_attr(attr); 467 468 if (block_attr->store) 469 return block_attr->store(kobj, attr, buffer, count); 470 return -EIO; 471 } 472 473 /* edac_dev file operations for a 'block' */ 474 static const struct sysfs_ops device_block_ops = { 475 .show = edac_dev_block_show, 476 .store = edac_dev_block_store 477 }; 478 479 #define BLOCK_ATTR(_name,_mode,_show,_store) \ 480 static struct edac_dev_sysfs_block_attribute attr_block_##_name = { \ 481 .attr = {.name = __stringify(_name), .mode = _mode }, \ 482 .show = _show, \ 483 .store = _store, \ 484 }; 485 486 BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL); 487 BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL); 488 489 /* list of edac_dev 'block' attributes */ 490 static struct edac_dev_sysfs_block_attribute *device_block_attr[] = { 491 &attr_block_ce_count, 492 &attr_block_ue_count, 493 NULL, 494 }; 495 496 /* The 'ktype' for each edac_dev 'block' */ 497 static struct kobj_type ktype_block_ctrl = { 498 .release = edac_device_ctrl_block_release, 499 .sysfs_ops = &device_block_ops, 500 .default_attrs = (struct attribute **)device_block_attr, 501 }; 502 503 /* block ctor/dtor code */ 504 505 /* 506 * edac_device_create_block 507 */ 508 static int edac_device_create_block(struct edac_device_ctl_info *edac_dev, 509 struct edac_device_instance *instance, 510 struct edac_device_block *block) 511 { 512 int i; 513 int err; 514 struct edac_dev_sysfs_block_attribute *sysfs_attrib; 515 struct kobject *main_kobj; 516 517 edac_dbg(4, "Instance '%s' inst_p=%p block '%s' block_p=%p\n", 518 instance->name, instance, block->name, block); 519 edac_dbg(4, "block kobj=%p block kobj->parent=%p\n", 520 &block->kobj, &block->kobj.parent); 521 522 /* init this block's kobject */ 523 memset(&block->kobj, 0, sizeof(struct kobject)); 524 525 /* bump the main kobject's reference count for this controller 526 * and this instance is dependent on the main 527 */ 528 main_kobj = kobject_get(&edac_dev->kobj); 529 if (!main_kobj) { 530 err = -ENODEV; 531 goto err_out; 532 } 533 534 /* Add this block's kobject */ 535 err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl, 536 &instance->kobj, 537 "%s", block->name); 538 if (err) { 539 edac_dbg(1, "Failed to register instance '%s'\n", block->name); 540 kobject_put(main_kobj); 541 err = -ENODEV; 542 goto err_out; 543 } 544 545 /* If there are driver level block attributes, then added them 546 * to the block kobject 547 */ 548 sysfs_attrib = block->block_attributes; 549 if (sysfs_attrib && block->nr_attribs) { 550 for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) { 551 552 edac_dbg(4, "creating block attrib='%s' attrib->%p to kobj=%p\n", 553 sysfs_attrib->attr.name, 554 sysfs_attrib, &block->kobj); 555 556 /* Create each block_attribute file */ 557 err = sysfs_create_file(&block->kobj, 558 &sysfs_attrib->attr); 559 if (err) 560 goto err_on_attrib; 561 } 562 } 563 kobject_uevent(&block->kobj, KOBJ_ADD); 564 565 return 0; 566 567 /* Error unwind stack */ 568 err_on_attrib: 569 kobject_put(&block->kobj); 570 571 err_out: 572 return err; 573 } 574 575 /* 576 * edac_device_delete_block(edac_dev,block); 577 */ 578 static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev, 579 struct edac_device_block *block) 580 { 581 struct edac_dev_sysfs_block_attribute *sysfs_attrib; 582 int i; 583 584 /* if this block has 'attributes' then we need to iterate over the list 585 * and 'remove' the attributes on this block 586 */ 587 sysfs_attrib = block->block_attributes; 588 if (sysfs_attrib && block->nr_attribs) { 589 for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) { 590 591 /* remove each block_attrib file */ 592 sysfs_remove_file(&block->kobj, 593 (struct attribute *) sysfs_attrib); 594 } 595 } 596 597 /* unregister this block's kobject, SEE: 598 * edac_device_ctrl_block_release() callback operation 599 */ 600 kobject_put(&block->kobj); 601 } 602 603 /* instance ctor/dtor code */ 604 605 /* 606 * edac_device_create_instance 607 * create just one instance of an edac_device 'instance' 608 */ 609 static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev, 610 int idx) 611 { 612 int i, j; 613 int err; 614 struct edac_device_instance *instance; 615 struct kobject *main_kobj; 616 617 instance = &edac_dev->instances[idx]; 618 619 /* Init the instance's kobject */ 620 memset(&instance->kobj, 0, sizeof(struct kobject)); 621 622 instance->ctl = edac_dev; 623 624 /* bump the main kobject's reference count for this controller 625 * and this instance is dependent on the main 626 */ 627 main_kobj = kobject_get(&edac_dev->kobj); 628 if (!main_kobj) { 629 err = -ENODEV; 630 goto err_out; 631 } 632 633 /* Formally register this instance's kobject under the edac_device */ 634 err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl, 635 &edac_dev->kobj, "%s", instance->name); 636 if (err != 0) { 637 edac_dbg(2, "Failed to register instance '%s'\n", 638 instance->name); 639 kobject_put(main_kobj); 640 goto err_out; 641 } 642 643 edac_dbg(4, "now register '%d' blocks for instance %d\n", 644 instance->nr_blocks, idx); 645 646 /* register all blocks of this instance */ 647 for (i = 0; i < instance->nr_blocks; i++) { 648 err = edac_device_create_block(edac_dev, instance, 649 &instance->blocks[i]); 650 if (err) { 651 /* If any fail, remove all previous ones */ 652 for (j = 0; j < i; j++) 653 edac_device_delete_block(edac_dev, 654 &instance->blocks[j]); 655 goto err_release_instance_kobj; 656 } 657 } 658 kobject_uevent(&instance->kobj, KOBJ_ADD); 659 660 edac_dbg(4, "Registered instance %d '%s' kobject\n", 661 idx, instance->name); 662 663 return 0; 664 665 /* error unwind stack */ 666 err_release_instance_kobj: 667 kobject_put(&instance->kobj); 668 669 err_out: 670 return err; 671 } 672 673 /* 674 * edac_device_remove_instance 675 * remove an edac_device instance 676 */ 677 static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev, 678 int idx) 679 { 680 struct edac_device_instance *instance; 681 int i; 682 683 instance = &edac_dev->instances[idx]; 684 685 /* unregister all blocks in this instance */ 686 for (i = 0; i < instance->nr_blocks; i++) 687 edac_device_delete_block(edac_dev, &instance->blocks[i]); 688 689 /* unregister this instance's kobject, SEE: 690 * edac_device_ctrl_instance_release() for callback operation 691 */ 692 kobject_put(&instance->kobj); 693 } 694 695 /* 696 * edac_device_create_instances 697 * create the first level of 'instances' for this device 698 * (ie 'cache' might have 'cache0', 'cache1', 'cache2', etc 699 */ 700 static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev) 701 { 702 int i, j; 703 int err; 704 705 edac_dbg(0, "\n"); 706 707 /* iterate over creation of the instances */ 708 for (i = 0; i < edac_dev->nr_instances; i++) { 709 err = edac_device_create_instance(edac_dev, i); 710 if (err) { 711 /* unwind previous instances on error */ 712 for (j = 0; j < i; j++) 713 edac_device_delete_instance(edac_dev, j); 714 return err; 715 } 716 } 717 718 return 0; 719 } 720 721 /* 722 * edac_device_delete_instances(edac_dev); 723 * unregister all the kobjects of the instances 724 */ 725 static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev) 726 { 727 int i; 728 729 /* iterate over creation of the instances */ 730 for (i = 0; i < edac_dev->nr_instances; i++) 731 edac_device_delete_instance(edac_dev, i); 732 } 733 734 /* edac_dev sysfs ctor/dtor code */ 735 736 /* 737 * edac_device_add_main_sysfs_attributes 738 * add some attributes to this instance's main kobject 739 */ 740 static int edac_device_add_main_sysfs_attributes( 741 struct edac_device_ctl_info *edac_dev) 742 { 743 struct edac_dev_sysfs_attribute *sysfs_attrib; 744 int err = 0; 745 746 sysfs_attrib = edac_dev->sysfs_attributes; 747 if (sysfs_attrib) { 748 /* iterate over the array and create an attribute for each 749 * entry in the list 750 */ 751 while (sysfs_attrib->attr.name != NULL) { 752 err = sysfs_create_file(&edac_dev->kobj, 753 (struct attribute*) sysfs_attrib); 754 if (err) 755 goto err_out; 756 757 sysfs_attrib++; 758 } 759 } 760 761 err_out: 762 return err; 763 } 764 765 /* 766 * edac_device_remove_main_sysfs_attributes 767 * remove any attributes to this instance's main kobject 768 */ 769 static void edac_device_remove_main_sysfs_attributes( 770 struct edac_device_ctl_info *edac_dev) 771 { 772 struct edac_dev_sysfs_attribute *sysfs_attrib; 773 774 /* if there are main attributes, defined, remove them. First, 775 * point to the start of the array and iterate over it 776 * removing each attribute listed from this device's instance's kobject 777 */ 778 sysfs_attrib = edac_dev->sysfs_attributes; 779 if (sysfs_attrib) { 780 while (sysfs_attrib->attr.name != NULL) { 781 sysfs_remove_file(&edac_dev->kobj, 782 (struct attribute *) sysfs_attrib); 783 sysfs_attrib++; 784 } 785 } 786 } 787 788 /* 789 * edac_device_create_sysfs() Constructor 790 * 791 * accept a created edac_device control structure 792 * and 'export' it to sysfs. The 'main' kobj should already have been 793 * created. 'instance' and 'block' kobjects should be registered 794 * along with any 'block' attributes from the low driver. In addition, 795 * the main attributes (if any) are connected to the main kobject of 796 * the control structure. 797 * 798 * Return: 799 * 0 Success 800 * !0 Failure 801 */ 802 int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev) 803 { 804 int err; 805 struct kobject *edac_kobj = &edac_dev->kobj; 806 807 edac_dbg(0, "idx=%d\n", edac_dev->dev_idx); 808 809 /* go create any main attributes callers wants */ 810 err = edac_device_add_main_sysfs_attributes(edac_dev); 811 if (err) { 812 edac_dbg(0, "failed to add sysfs attribs\n"); 813 goto err_out; 814 } 815 816 /* create a symlink from the edac device 817 * to the platform 'device' being used for this 818 */ 819 err = sysfs_create_link(edac_kobj, 820 &edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK); 821 if (err) { 822 edac_dbg(0, "sysfs_create_link() returned err= %d\n", err); 823 goto err_remove_main_attribs; 824 } 825 826 /* Create the first level instance directories 827 * In turn, the nested blocks beneath the instances will 828 * be registered as well 829 */ 830 err = edac_device_create_instances(edac_dev); 831 if (err) { 832 edac_dbg(0, "edac_device_create_instances() returned err= %d\n", 833 err); 834 goto err_remove_link; 835 } 836 837 838 edac_dbg(4, "create-instances done, idx=%d\n", edac_dev->dev_idx); 839 840 return 0; 841 842 /* Error unwind stack */ 843 err_remove_link: 844 /* remove the sym link */ 845 sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK); 846 847 err_remove_main_attribs: 848 edac_device_remove_main_sysfs_attributes(edac_dev); 849 850 err_out: 851 return err; 852 } 853 854 /* 855 * edac_device_remove_sysfs() destructor 856 * 857 * given an edac_device struct, tear down the kobject resources 858 */ 859 void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev) 860 { 861 edac_dbg(0, "\n"); 862 863 /* remove any main attributes for this device */ 864 edac_device_remove_main_sysfs_attributes(edac_dev); 865 866 /* remove the device sym link */ 867 sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK); 868 869 /* walk the instance/block kobject tree, deconstructing it */ 870 edac_device_delete_instances(edac_dev); 871 } 872