1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * DAMON sysfs Interface 4 * 5 * Copyright (c) 2022 SeongJae Park <sj@kernel.org> 6 */ 7 8 #include <linux/pid.h> 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 12 #include "sysfs-common.h" 13 14 /* 15 * init region directory 16 */ 17 18 struct damon_sysfs_region { 19 struct kobject kobj; 20 struct damon_addr_range ar; 21 }; 22 23 static struct damon_sysfs_region *damon_sysfs_region_alloc(void) 24 { 25 return kzalloc(sizeof(struct damon_sysfs_region), GFP_KERNEL); 26 } 27 28 static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, 29 char *buf) 30 { 31 struct damon_sysfs_region *region = container_of(kobj, 32 struct damon_sysfs_region, kobj); 33 34 return sysfs_emit(buf, "%lu\n", region->ar.start); 35 } 36 37 static ssize_t start_store(struct kobject *kobj, struct kobj_attribute *attr, 38 const char *buf, size_t count) 39 { 40 struct damon_sysfs_region *region = container_of(kobj, 41 struct damon_sysfs_region, kobj); 42 int err = kstrtoul(buf, 0, ®ion->ar.start); 43 44 return err ? err : count; 45 } 46 47 static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr, 48 char *buf) 49 { 50 struct damon_sysfs_region *region = container_of(kobj, 51 struct damon_sysfs_region, kobj); 52 53 return sysfs_emit(buf, "%lu\n", region->ar.end); 54 } 55 56 static ssize_t end_store(struct kobject *kobj, struct kobj_attribute *attr, 57 const char *buf, size_t count) 58 { 59 struct damon_sysfs_region *region = container_of(kobj, 60 struct damon_sysfs_region, kobj); 61 int err = kstrtoul(buf, 0, ®ion->ar.end); 62 63 return err ? err : count; 64 } 65 66 static void damon_sysfs_region_release(struct kobject *kobj) 67 { 68 kfree(container_of(kobj, struct damon_sysfs_region, kobj)); 69 } 70 71 static struct kobj_attribute damon_sysfs_region_start_attr = 72 __ATTR_RW_MODE(start, 0600); 73 74 static struct kobj_attribute damon_sysfs_region_end_attr = 75 __ATTR_RW_MODE(end, 0600); 76 77 static struct attribute *damon_sysfs_region_attrs[] = { 78 &damon_sysfs_region_start_attr.attr, 79 &damon_sysfs_region_end_attr.attr, 80 NULL, 81 }; 82 ATTRIBUTE_GROUPS(damon_sysfs_region); 83 84 static const struct kobj_type damon_sysfs_region_ktype = { 85 .release = damon_sysfs_region_release, 86 .sysfs_ops = &kobj_sysfs_ops, 87 .default_groups = damon_sysfs_region_groups, 88 }; 89 90 /* 91 * init_regions directory 92 */ 93 94 struct damon_sysfs_regions { 95 struct kobject kobj; 96 struct damon_sysfs_region **regions_arr; 97 int nr; 98 }; 99 100 static struct damon_sysfs_regions *damon_sysfs_regions_alloc(void) 101 { 102 return kzalloc(sizeof(struct damon_sysfs_regions), GFP_KERNEL); 103 } 104 105 static void damon_sysfs_regions_rm_dirs(struct damon_sysfs_regions *regions) 106 { 107 struct damon_sysfs_region **regions_arr = regions->regions_arr; 108 int i; 109 110 for (i = 0; i < regions->nr; i++) 111 kobject_put(®ions_arr[i]->kobj); 112 regions->nr = 0; 113 kfree(regions_arr); 114 regions->regions_arr = NULL; 115 } 116 117 static int damon_sysfs_regions_add_dirs(struct damon_sysfs_regions *regions, 118 int nr_regions) 119 { 120 struct damon_sysfs_region **regions_arr, *region; 121 int err, i; 122 123 damon_sysfs_regions_rm_dirs(regions); 124 if (!nr_regions) 125 return 0; 126 127 regions_arr = kmalloc_array(nr_regions, sizeof(*regions_arr), 128 GFP_KERNEL | __GFP_NOWARN); 129 if (!regions_arr) 130 return -ENOMEM; 131 regions->regions_arr = regions_arr; 132 133 for (i = 0; i < nr_regions; i++) { 134 region = damon_sysfs_region_alloc(); 135 if (!region) { 136 damon_sysfs_regions_rm_dirs(regions); 137 return -ENOMEM; 138 } 139 140 err = kobject_init_and_add(®ion->kobj, 141 &damon_sysfs_region_ktype, ®ions->kobj, 142 "%d", i); 143 if (err) { 144 kobject_put(®ion->kobj); 145 damon_sysfs_regions_rm_dirs(regions); 146 return err; 147 } 148 149 regions_arr[i] = region; 150 regions->nr++; 151 } 152 return 0; 153 } 154 155 static ssize_t nr_regions_show(struct kobject *kobj, 156 struct kobj_attribute *attr, char *buf) 157 { 158 struct damon_sysfs_regions *regions = container_of(kobj, 159 struct damon_sysfs_regions, kobj); 160 161 return sysfs_emit(buf, "%d\n", regions->nr); 162 } 163 164 static ssize_t nr_regions_store(struct kobject *kobj, 165 struct kobj_attribute *attr, const char *buf, size_t count) 166 { 167 struct damon_sysfs_regions *regions; 168 int nr, err = kstrtoint(buf, 0, &nr); 169 170 if (err) 171 return err; 172 if (nr < 0) 173 return -EINVAL; 174 175 regions = container_of(kobj, struct damon_sysfs_regions, kobj); 176 177 if (!mutex_trylock(&damon_sysfs_lock)) 178 return -EBUSY; 179 err = damon_sysfs_regions_add_dirs(regions, nr); 180 mutex_unlock(&damon_sysfs_lock); 181 if (err) 182 return err; 183 184 return count; 185 } 186 187 static void damon_sysfs_regions_release(struct kobject *kobj) 188 { 189 kfree(container_of(kobj, struct damon_sysfs_regions, kobj)); 190 } 191 192 static struct kobj_attribute damon_sysfs_regions_nr_attr = 193 __ATTR_RW_MODE(nr_regions, 0600); 194 195 static struct attribute *damon_sysfs_regions_attrs[] = { 196 &damon_sysfs_regions_nr_attr.attr, 197 NULL, 198 }; 199 ATTRIBUTE_GROUPS(damon_sysfs_regions); 200 201 static const struct kobj_type damon_sysfs_regions_ktype = { 202 .release = damon_sysfs_regions_release, 203 .sysfs_ops = &kobj_sysfs_ops, 204 .default_groups = damon_sysfs_regions_groups, 205 }; 206 207 /* 208 * target directory 209 */ 210 211 struct damon_sysfs_target { 212 struct kobject kobj; 213 struct damon_sysfs_regions *regions; 214 int pid; 215 }; 216 217 static struct damon_sysfs_target *damon_sysfs_target_alloc(void) 218 { 219 return kzalloc(sizeof(struct damon_sysfs_target), GFP_KERNEL); 220 } 221 222 static int damon_sysfs_target_add_dirs(struct damon_sysfs_target *target) 223 { 224 struct damon_sysfs_regions *regions = damon_sysfs_regions_alloc(); 225 int err; 226 227 if (!regions) 228 return -ENOMEM; 229 230 err = kobject_init_and_add(®ions->kobj, &damon_sysfs_regions_ktype, 231 &target->kobj, "regions"); 232 if (err) 233 kobject_put(®ions->kobj); 234 else 235 target->regions = regions; 236 return err; 237 } 238 239 static void damon_sysfs_target_rm_dirs(struct damon_sysfs_target *target) 240 { 241 damon_sysfs_regions_rm_dirs(target->regions); 242 kobject_put(&target->regions->kobj); 243 } 244 245 static ssize_t pid_target_show(struct kobject *kobj, 246 struct kobj_attribute *attr, char *buf) 247 { 248 struct damon_sysfs_target *target = container_of(kobj, 249 struct damon_sysfs_target, kobj); 250 251 return sysfs_emit(buf, "%d\n", target->pid); 252 } 253 254 static ssize_t pid_target_store(struct kobject *kobj, 255 struct kobj_attribute *attr, const char *buf, size_t count) 256 { 257 struct damon_sysfs_target *target = container_of(kobj, 258 struct damon_sysfs_target, kobj); 259 int err = kstrtoint(buf, 0, &target->pid); 260 261 if (err) 262 return -EINVAL; 263 return count; 264 } 265 266 static void damon_sysfs_target_release(struct kobject *kobj) 267 { 268 kfree(container_of(kobj, struct damon_sysfs_target, kobj)); 269 } 270 271 static struct kobj_attribute damon_sysfs_target_pid_attr = 272 __ATTR_RW_MODE(pid_target, 0600); 273 274 static struct attribute *damon_sysfs_target_attrs[] = { 275 &damon_sysfs_target_pid_attr.attr, 276 NULL, 277 }; 278 ATTRIBUTE_GROUPS(damon_sysfs_target); 279 280 static const struct kobj_type damon_sysfs_target_ktype = { 281 .release = damon_sysfs_target_release, 282 .sysfs_ops = &kobj_sysfs_ops, 283 .default_groups = damon_sysfs_target_groups, 284 }; 285 286 /* 287 * targets directory 288 */ 289 290 struct damon_sysfs_targets { 291 struct kobject kobj; 292 struct damon_sysfs_target **targets_arr; 293 int nr; 294 }; 295 296 static struct damon_sysfs_targets *damon_sysfs_targets_alloc(void) 297 { 298 return kzalloc(sizeof(struct damon_sysfs_targets), GFP_KERNEL); 299 } 300 301 static void damon_sysfs_targets_rm_dirs(struct damon_sysfs_targets *targets) 302 { 303 struct damon_sysfs_target **targets_arr = targets->targets_arr; 304 int i; 305 306 for (i = 0; i < targets->nr; i++) { 307 damon_sysfs_target_rm_dirs(targets_arr[i]); 308 kobject_put(&targets_arr[i]->kobj); 309 } 310 targets->nr = 0; 311 kfree(targets_arr); 312 targets->targets_arr = NULL; 313 } 314 315 static int damon_sysfs_targets_add_dirs(struct damon_sysfs_targets *targets, 316 int nr_targets) 317 { 318 struct damon_sysfs_target **targets_arr, *target; 319 int err, i; 320 321 damon_sysfs_targets_rm_dirs(targets); 322 if (!nr_targets) 323 return 0; 324 325 targets_arr = kmalloc_array(nr_targets, sizeof(*targets_arr), 326 GFP_KERNEL | __GFP_NOWARN); 327 if (!targets_arr) 328 return -ENOMEM; 329 targets->targets_arr = targets_arr; 330 331 for (i = 0; i < nr_targets; i++) { 332 target = damon_sysfs_target_alloc(); 333 if (!target) { 334 damon_sysfs_targets_rm_dirs(targets); 335 return -ENOMEM; 336 } 337 338 err = kobject_init_and_add(&target->kobj, 339 &damon_sysfs_target_ktype, &targets->kobj, 340 "%d", i); 341 if (err) 342 goto out; 343 344 err = damon_sysfs_target_add_dirs(target); 345 if (err) 346 goto out; 347 348 targets_arr[i] = target; 349 targets->nr++; 350 } 351 return 0; 352 353 out: 354 damon_sysfs_targets_rm_dirs(targets); 355 kobject_put(&target->kobj); 356 return err; 357 } 358 359 static ssize_t nr_targets_show(struct kobject *kobj, 360 struct kobj_attribute *attr, char *buf) 361 { 362 struct damon_sysfs_targets *targets = container_of(kobj, 363 struct damon_sysfs_targets, kobj); 364 365 return sysfs_emit(buf, "%d\n", targets->nr); 366 } 367 368 static ssize_t nr_targets_store(struct kobject *kobj, 369 struct kobj_attribute *attr, const char *buf, size_t count) 370 { 371 struct damon_sysfs_targets *targets; 372 int nr, err = kstrtoint(buf, 0, &nr); 373 374 if (err) 375 return err; 376 if (nr < 0) 377 return -EINVAL; 378 379 targets = container_of(kobj, struct damon_sysfs_targets, kobj); 380 381 if (!mutex_trylock(&damon_sysfs_lock)) 382 return -EBUSY; 383 err = damon_sysfs_targets_add_dirs(targets, nr); 384 mutex_unlock(&damon_sysfs_lock); 385 if (err) 386 return err; 387 388 return count; 389 } 390 391 static void damon_sysfs_targets_release(struct kobject *kobj) 392 { 393 kfree(container_of(kobj, struct damon_sysfs_targets, kobj)); 394 } 395 396 static struct kobj_attribute damon_sysfs_targets_nr_attr = 397 __ATTR_RW_MODE(nr_targets, 0600); 398 399 static struct attribute *damon_sysfs_targets_attrs[] = { 400 &damon_sysfs_targets_nr_attr.attr, 401 NULL, 402 }; 403 ATTRIBUTE_GROUPS(damon_sysfs_targets); 404 405 static const struct kobj_type damon_sysfs_targets_ktype = { 406 .release = damon_sysfs_targets_release, 407 .sysfs_ops = &kobj_sysfs_ops, 408 .default_groups = damon_sysfs_targets_groups, 409 }; 410 411 /* 412 * intervals goal directory 413 */ 414 415 struct damon_sysfs_intervals_goal { 416 struct kobject kobj; 417 unsigned long access_bp; 418 unsigned long aggrs; 419 unsigned long min_sample_us; 420 unsigned long max_sample_us; 421 }; 422 423 static struct damon_sysfs_intervals_goal *damon_sysfs_intervals_goal_alloc( 424 unsigned long access_bp, unsigned long aggrs, 425 unsigned long min_sample_us, unsigned long max_sample_us) 426 { 427 struct damon_sysfs_intervals_goal *goal = kmalloc(sizeof(*goal), 428 GFP_KERNEL); 429 430 if (!goal) 431 return NULL; 432 433 goal->kobj = (struct kobject){}; 434 goal->access_bp = access_bp; 435 goal->aggrs = aggrs; 436 goal->min_sample_us = min_sample_us; 437 goal->max_sample_us = max_sample_us; 438 return goal; 439 } 440 441 static ssize_t access_bp_show(struct kobject *kobj, 442 struct kobj_attribute *attr, char *buf) 443 { 444 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 445 struct damon_sysfs_intervals_goal, kobj); 446 447 return sysfs_emit(buf, "%lu\n", goal->access_bp); 448 } 449 450 static ssize_t access_bp_store(struct kobject *kobj, 451 struct kobj_attribute *attr, const char *buf, size_t count) 452 { 453 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 454 struct damon_sysfs_intervals_goal, kobj); 455 unsigned long nr; 456 int err = kstrtoul(buf, 0, &nr); 457 458 if (err) 459 return err; 460 461 goal->access_bp = nr; 462 return count; 463 } 464 465 static ssize_t aggrs_show(struct kobject *kobj, 466 struct kobj_attribute *attr, char *buf) 467 { 468 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 469 struct damon_sysfs_intervals_goal, kobj); 470 471 return sysfs_emit(buf, "%lu\n", goal->aggrs); 472 } 473 474 static ssize_t aggrs_store(struct kobject *kobj, 475 struct kobj_attribute *attr, const char *buf, size_t count) 476 { 477 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 478 struct damon_sysfs_intervals_goal, kobj); 479 unsigned long nr; 480 int err = kstrtoul(buf, 0, &nr); 481 482 if (err) 483 return err; 484 485 goal->aggrs = nr; 486 return count; 487 } 488 489 static ssize_t min_sample_us_show(struct kobject *kobj, 490 struct kobj_attribute *attr, char *buf) 491 { 492 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 493 struct damon_sysfs_intervals_goal, kobj); 494 495 return sysfs_emit(buf, "%lu\n", goal->min_sample_us); 496 } 497 498 static ssize_t min_sample_us_store(struct kobject *kobj, 499 struct kobj_attribute *attr, const char *buf, size_t count) 500 { 501 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 502 struct damon_sysfs_intervals_goal, kobj); 503 unsigned long nr; 504 int err = kstrtoul(buf, 0, &nr); 505 506 if (err) 507 return err; 508 509 goal->min_sample_us = nr; 510 return count; 511 } 512 513 static ssize_t max_sample_us_show(struct kobject *kobj, 514 struct kobj_attribute *attr, char *buf) 515 { 516 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 517 struct damon_sysfs_intervals_goal, kobj); 518 519 return sysfs_emit(buf, "%lu\n", goal->max_sample_us); 520 } 521 522 static ssize_t max_sample_us_store(struct kobject *kobj, 523 struct kobj_attribute *attr, const char *buf, size_t count) 524 { 525 struct damon_sysfs_intervals_goal *goal = container_of(kobj, 526 struct damon_sysfs_intervals_goal, kobj); 527 unsigned long nr; 528 int err = kstrtoul(buf, 0, &nr); 529 530 if (err) 531 return err; 532 533 goal->max_sample_us = nr; 534 return count; 535 } 536 537 static void damon_sysfs_intervals_goal_release(struct kobject *kobj) 538 { 539 kfree(container_of(kobj, struct damon_sysfs_intervals_goal, kobj)); 540 } 541 542 static struct kobj_attribute damon_sysfs_intervals_goal_access_bp_attr = 543 __ATTR_RW_MODE(access_bp, 0600); 544 545 static struct kobj_attribute damon_sysfs_intervals_goal_aggrs_attr = 546 __ATTR_RW_MODE(aggrs, 0600); 547 548 static struct kobj_attribute damon_sysfs_intervals_goal_min_sample_us_attr = 549 __ATTR_RW_MODE(min_sample_us, 0600); 550 551 static struct kobj_attribute damon_sysfs_intervals_goal_max_sample_us_attr = 552 __ATTR_RW_MODE(max_sample_us, 0600); 553 554 static struct attribute *damon_sysfs_intervals_goal_attrs[] = { 555 &damon_sysfs_intervals_goal_access_bp_attr.attr, 556 &damon_sysfs_intervals_goal_aggrs_attr.attr, 557 &damon_sysfs_intervals_goal_min_sample_us_attr.attr, 558 &damon_sysfs_intervals_goal_max_sample_us_attr.attr, 559 NULL, 560 }; 561 ATTRIBUTE_GROUPS(damon_sysfs_intervals_goal); 562 563 static const struct kobj_type damon_sysfs_intervals_goal_ktype = { 564 .release = damon_sysfs_intervals_goal_release, 565 .sysfs_ops = &kobj_sysfs_ops, 566 .default_groups = damon_sysfs_intervals_goal_groups, 567 }; 568 569 /* 570 * intervals directory 571 */ 572 573 struct damon_sysfs_intervals { 574 struct kobject kobj; 575 unsigned long sample_us; 576 unsigned long aggr_us; 577 unsigned long update_us; 578 struct damon_sysfs_intervals_goal *intervals_goal; 579 }; 580 581 static struct damon_sysfs_intervals *damon_sysfs_intervals_alloc( 582 unsigned long sample_us, unsigned long aggr_us, 583 unsigned long update_us) 584 { 585 struct damon_sysfs_intervals *intervals = kmalloc(sizeof(*intervals), 586 GFP_KERNEL); 587 588 if (!intervals) 589 return NULL; 590 591 intervals->kobj = (struct kobject){}; 592 intervals->sample_us = sample_us; 593 intervals->aggr_us = aggr_us; 594 intervals->update_us = update_us; 595 return intervals; 596 } 597 598 static int damon_sysfs_intervals_add_dirs(struct damon_sysfs_intervals *intervals) 599 { 600 struct damon_sysfs_intervals_goal *goal; 601 int err; 602 603 goal = damon_sysfs_intervals_goal_alloc(0, 0, 0, 0); 604 if (!goal) 605 return -ENOMEM; 606 607 err = kobject_init_and_add(&goal->kobj, 608 &damon_sysfs_intervals_goal_ktype, &intervals->kobj, 609 "intervals_goal"); 610 if (err) { 611 kobject_put(&goal->kobj); 612 intervals->intervals_goal = NULL; 613 return err; 614 } 615 intervals->intervals_goal = goal; 616 return 0; 617 } 618 619 static void damon_sysfs_intervals_rm_dirs(struct damon_sysfs_intervals *intervals) 620 { 621 kobject_put(&intervals->intervals_goal->kobj); 622 } 623 624 static ssize_t sample_us_show(struct kobject *kobj, 625 struct kobj_attribute *attr, char *buf) 626 { 627 struct damon_sysfs_intervals *intervals = container_of(kobj, 628 struct damon_sysfs_intervals, kobj); 629 630 return sysfs_emit(buf, "%lu\n", intervals->sample_us); 631 } 632 633 static ssize_t sample_us_store(struct kobject *kobj, 634 struct kobj_attribute *attr, const char *buf, size_t count) 635 { 636 struct damon_sysfs_intervals *intervals = container_of(kobj, 637 struct damon_sysfs_intervals, kobj); 638 unsigned long us; 639 int err = kstrtoul(buf, 0, &us); 640 641 if (err) 642 return err; 643 644 intervals->sample_us = us; 645 return count; 646 } 647 648 static ssize_t aggr_us_show(struct kobject *kobj, struct kobj_attribute *attr, 649 char *buf) 650 { 651 struct damon_sysfs_intervals *intervals = container_of(kobj, 652 struct damon_sysfs_intervals, kobj); 653 654 return sysfs_emit(buf, "%lu\n", intervals->aggr_us); 655 } 656 657 static ssize_t aggr_us_store(struct kobject *kobj, struct kobj_attribute *attr, 658 const char *buf, size_t count) 659 { 660 struct damon_sysfs_intervals *intervals = container_of(kobj, 661 struct damon_sysfs_intervals, kobj); 662 unsigned long us; 663 int err = kstrtoul(buf, 0, &us); 664 665 if (err) 666 return err; 667 668 intervals->aggr_us = us; 669 return count; 670 } 671 672 static ssize_t update_us_show(struct kobject *kobj, 673 struct kobj_attribute *attr, char *buf) 674 { 675 struct damon_sysfs_intervals *intervals = container_of(kobj, 676 struct damon_sysfs_intervals, kobj); 677 678 return sysfs_emit(buf, "%lu\n", intervals->update_us); 679 } 680 681 static ssize_t update_us_store(struct kobject *kobj, 682 struct kobj_attribute *attr, const char *buf, size_t count) 683 { 684 struct damon_sysfs_intervals *intervals = container_of(kobj, 685 struct damon_sysfs_intervals, kobj); 686 unsigned long us; 687 int err = kstrtoul(buf, 0, &us); 688 689 if (err) 690 return err; 691 692 intervals->update_us = us; 693 return count; 694 } 695 696 static void damon_sysfs_intervals_release(struct kobject *kobj) 697 { 698 kfree(container_of(kobj, struct damon_sysfs_intervals, kobj)); 699 } 700 701 static struct kobj_attribute damon_sysfs_intervals_sample_us_attr = 702 __ATTR_RW_MODE(sample_us, 0600); 703 704 static struct kobj_attribute damon_sysfs_intervals_aggr_us_attr = 705 __ATTR_RW_MODE(aggr_us, 0600); 706 707 static struct kobj_attribute damon_sysfs_intervals_update_us_attr = 708 __ATTR_RW_MODE(update_us, 0600); 709 710 static struct attribute *damon_sysfs_intervals_attrs[] = { 711 &damon_sysfs_intervals_sample_us_attr.attr, 712 &damon_sysfs_intervals_aggr_us_attr.attr, 713 &damon_sysfs_intervals_update_us_attr.attr, 714 NULL, 715 }; 716 ATTRIBUTE_GROUPS(damon_sysfs_intervals); 717 718 static const struct kobj_type damon_sysfs_intervals_ktype = { 719 .release = damon_sysfs_intervals_release, 720 .sysfs_ops = &kobj_sysfs_ops, 721 .default_groups = damon_sysfs_intervals_groups, 722 }; 723 724 /* 725 * monitoring_attrs directory 726 */ 727 728 struct damon_sysfs_attrs { 729 struct kobject kobj; 730 struct damon_sysfs_intervals *intervals; 731 struct damon_sysfs_ul_range *nr_regions_range; 732 }; 733 734 static struct damon_sysfs_attrs *damon_sysfs_attrs_alloc(void) 735 { 736 struct damon_sysfs_attrs *attrs = kmalloc(sizeof(*attrs), GFP_KERNEL); 737 738 if (!attrs) 739 return NULL; 740 attrs->kobj = (struct kobject){}; 741 return attrs; 742 } 743 744 static int damon_sysfs_attrs_add_dirs(struct damon_sysfs_attrs *attrs) 745 { 746 struct damon_sysfs_intervals *intervals; 747 struct damon_sysfs_ul_range *nr_regions_range; 748 int err; 749 750 intervals = damon_sysfs_intervals_alloc(5000, 100000, 60000000); 751 if (!intervals) 752 return -ENOMEM; 753 754 err = kobject_init_and_add(&intervals->kobj, 755 &damon_sysfs_intervals_ktype, &attrs->kobj, 756 "intervals"); 757 if (err) 758 goto put_intervals_out; 759 err = damon_sysfs_intervals_add_dirs(intervals); 760 if (err) 761 goto put_intervals_out; 762 attrs->intervals = intervals; 763 764 nr_regions_range = damon_sysfs_ul_range_alloc(10, 1000); 765 if (!nr_regions_range) { 766 err = -ENOMEM; 767 goto put_intervals_out; 768 } 769 770 err = kobject_init_and_add(&nr_regions_range->kobj, 771 &damon_sysfs_ul_range_ktype, &attrs->kobj, 772 "nr_regions"); 773 if (err) 774 goto put_nr_regions_intervals_out; 775 attrs->nr_regions_range = nr_regions_range; 776 return 0; 777 778 put_nr_regions_intervals_out: 779 kobject_put(&nr_regions_range->kobj); 780 attrs->nr_regions_range = NULL; 781 put_intervals_out: 782 kobject_put(&intervals->kobj); 783 attrs->intervals = NULL; 784 return err; 785 } 786 787 static void damon_sysfs_attrs_rm_dirs(struct damon_sysfs_attrs *attrs) 788 { 789 kobject_put(&attrs->nr_regions_range->kobj); 790 damon_sysfs_intervals_rm_dirs(attrs->intervals); 791 kobject_put(&attrs->intervals->kobj); 792 } 793 794 static void damon_sysfs_attrs_release(struct kobject *kobj) 795 { 796 kfree(container_of(kobj, struct damon_sysfs_attrs, kobj)); 797 } 798 799 static struct attribute *damon_sysfs_attrs_attrs[] = { 800 NULL, 801 }; 802 ATTRIBUTE_GROUPS(damon_sysfs_attrs); 803 804 static const struct kobj_type damon_sysfs_attrs_ktype = { 805 .release = damon_sysfs_attrs_release, 806 .sysfs_ops = &kobj_sysfs_ops, 807 .default_groups = damon_sysfs_attrs_groups, 808 }; 809 810 /* 811 * context directory 812 */ 813 814 struct damon_sysfs_ops_name { 815 enum damon_ops_id ops_id; 816 char *name; 817 }; 818 819 static const struct damon_sysfs_ops_name damon_sysfs_ops_names[] = { 820 { 821 .ops_id = DAMON_OPS_VADDR, 822 .name = "vaddr", 823 }, 824 { 825 .ops_id = DAMON_OPS_FVADDR, 826 .name = "fvaddr", 827 }, 828 { 829 .ops_id = DAMON_OPS_PADDR, 830 .name = "paddr", 831 }, 832 }; 833 834 struct damon_sysfs_context { 835 struct kobject kobj; 836 enum damon_ops_id ops_id; 837 struct damon_sysfs_attrs *attrs; 838 struct damon_sysfs_targets *targets; 839 struct damon_sysfs_schemes *schemes; 840 }; 841 842 static struct damon_sysfs_context *damon_sysfs_context_alloc( 843 enum damon_ops_id ops_id) 844 { 845 struct damon_sysfs_context *context = kmalloc(sizeof(*context), 846 GFP_KERNEL); 847 848 if (!context) 849 return NULL; 850 context->kobj = (struct kobject){}; 851 context->ops_id = ops_id; 852 return context; 853 } 854 855 static int damon_sysfs_context_set_attrs(struct damon_sysfs_context *context) 856 { 857 struct damon_sysfs_attrs *attrs = damon_sysfs_attrs_alloc(); 858 int err; 859 860 if (!attrs) 861 return -ENOMEM; 862 err = kobject_init_and_add(&attrs->kobj, &damon_sysfs_attrs_ktype, 863 &context->kobj, "monitoring_attrs"); 864 if (err) 865 goto out; 866 err = damon_sysfs_attrs_add_dirs(attrs); 867 if (err) 868 goto out; 869 context->attrs = attrs; 870 return 0; 871 872 out: 873 kobject_put(&attrs->kobj); 874 return err; 875 } 876 877 static int damon_sysfs_context_set_targets(struct damon_sysfs_context *context) 878 { 879 struct damon_sysfs_targets *targets = damon_sysfs_targets_alloc(); 880 int err; 881 882 if (!targets) 883 return -ENOMEM; 884 err = kobject_init_and_add(&targets->kobj, &damon_sysfs_targets_ktype, 885 &context->kobj, "targets"); 886 if (err) { 887 kobject_put(&targets->kobj); 888 return err; 889 } 890 context->targets = targets; 891 return 0; 892 } 893 894 static int damon_sysfs_context_set_schemes(struct damon_sysfs_context *context) 895 { 896 struct damon_sysfs_schemes *schemes = damon_sysfs_schemes_alloc(); 897 int err; 898 899 if (!schemes) 900 return -ENOMEM; 901 err = kobject_init_and_add(&schemes->kobj, &damon_sysfs_schemes_ktype, 902 &context->kobj, "schemes"); 903 if (err) { 904 kobject_put(&schemes->kobj); 905 return err; 906 } 907 context->schemes = schemes; 908 return 0; 909 } 910 911 static int damon_sysfs_context_add_dirs(struct damon_sysfs_context *context) 912 { 913 int err; 914 915 err = damon_sysfs_context_set_attrs(context); 916 if (err) 917 return err; 918 919 err = damon_sysfs_context_set_targets(context); 920 if (err) 921 goto put_attrs_out; 922 923 err = damon_sysfs_context_set_schemes(context); 924 if (err) 925 goto put_targets_attrs_out; 926 return 0; 927 928 put_targets_attrs_out: 929 kobject_put(&context->targets->kobj); 930 context->targets = NULL; 931 put_attrs_out: 932 kobject_put(&context->attrs->kobj); 933 context->attrs = NULL; 934 return err; 935 } 936 937 static void damon_sysfs_context_rm_dirs(struct damon_sysfs_context *context) 938 { 939 damon_sysfs_attrs_rm_dirs(context->attrs); 940 kobject_put(&context->attrs->kobj); 941 damon_sysfs_targets_rm_dirs(context->targets); 942 kobject_put(&context->targets->kobj); 943 damon_sysfs_schemes_rm_dirs(context->schemes); 944 kobject_put(&context->schemes->kobj); 945 } 946 947 static ssize_t avail_operations_show(struct kobject *kobj, 948 struct kobj_attribute *attr, char *buf) 949 { 950 int len = 0; 951 int i; 952 953 for (i = 0; i < ARRAY_SIZE(damon_sysfs_ops_names); i++) { 954 const struct damon_sysfs_ops_name *ops_name; 955 956 ops_name = &damon_sysfs_ops_names[i]; 957 if (!damon_is_registered_ops(ops_name->ops_id)) 958 continue; 959 len += sysfs_emit_at(buf, len, "%s\n", ops_name->name); 960 } 961 return len; 962 } 963 964 static ssize_t operations_show(struct kobject *kobj, 965 struct kobj_attribute *attr, char *buf) 966 { 967 struct damon_sysfs_context *context = container_of(kobj, 968 struct damon_sysfs_context, kobj); 969 int i; 970 971 for (i = 0; i < ARRAY_SIZE(damon_sysfs_ops_names); i++) { 972 const struct damon_sysfs_ops_name *ops_name; 973 974 ops_name = &damon_sysfs_ops_names[i]; 975 if (ops_name->ops_id == context->ops_id) 976 return sysfs_emit(buf, "%s\n", ops_name->name); 977 } 978 return -EINVAL; 979 } 980 981 static ssize_t operations_store(struct kobject *kobj, 982 struct kobj_attribute *attr, const char *buf, size_t count) 983 { 984 struct damon_sysfs_context *context = container_of(kobj, 985 struct damon_sysfs_context, kobj); 986 int i; 987 988 for (i = 0; i < ARRAY_SIZE(damon_sysfs_ops_names); i++) { 989 const struct damon_sysfs_ops_name *ops_name; 990 991 ops_name = &damon_sysfs_ops_names[i]; 992 if (sysfs_streq(buf, ops_name->name)) { 993 context->ops_id = ops_name->ops_id; 994 return count; 995 } 996 } 997 return -EINVAL; 998 } 999 1000 static void damon_sysfs_context_release(struct kobject *kobj) 1001 { 1002 kfree(container_of(kobj, struct damon_sysfs_context, kobj)); 1003 } 1004 1005 static struct kobj_attribute damon_sysfs_context_avail_operations_attr = 1006 __ATTR_RO_MODE(avail_operations, 0400); 1007 1008 static struct kobj_attribute damon_sysfs_context_operations_attr = 1009 __ATTR_RW_MODE(operations, 0600); 1010 1011 static struct attribute *damon_sysfs_context_attrs[] = { 1012 &damon_sysfs_context_avail_operations_attr.attr, 1013 &damon_sysfs_context_operations_attr.attr, 1014 NULL, 1015 }; 1016 ATTRIBUTE_GROUPS(damon_sysfs_context); 1017 1018 static const struct kobj_type damon_sysfs_context_ktype = { 1019 .release = damon_sysfs_context_release, 1020 .sysfs_ops = &kobj_sysfs_ops, 1021 .default_groups = damon_sysfs_context_groups, 1022 }; 1023 1024 /* 1025 * contexts directory 1026 */ 1027 1028 struct damon_sysfs_contexts { 1029 struct kobject kobj; 1030 struct damon_sysfs_context **contexts_arr; 1031 int nr; 1032 }; 1033 1034 static struct damon_sysfs_contexts *damon_sysfs_contexts_alloc(void) 1035 { 1036 return kzalloc(sizeof(struct damon_sysfs_contexts), GFP_KERNEL); 1037 } 1038 1039 static void damon_sysfs_contexts_rm_dirs(struct damon_sysfs_contexts *contexts) 1040 { 1041 struct damon_sysfs_context **contexts_arr = contexts->contexts_arr; 1042 int i; 1043 1044 for (i = 0; i < contexts->nr; i++) { 1045 damon_sysfs_context_rm_dirs(contexts_arr[i]); 1046 kobject_put(&contexts_arr[i]->kobj); 1047 } 1048 contexts->nr = 0; 1049 kfree(contexts_arr); 1050 contexts->contexts_arr = NULL; 1051 } 1052 1053 static int damon_sysfs_contexts_add_dirs(struct damon_sysfs_contexts *contexts, 1054 int nr_contexts) 1055 { 1056 struct damon_sysfs_context **contexts_arr, *context; 1057 int err, i; 1058 1059 damon_sysfs_contexts_rm_dirs(contexts); 1060 if (!nr_contexts) 1061 return 0; 1062 1063 contexts_arr = kmalloc_array(nr_contexts, sizeof(*contexts_arr), 1064 GFP_KERNEL | __GFP_NOWARN); 1065 if (!contexts_arr) 1066 return -ENOMEM; 1067 contexts->contexts_arr = contexts_arr; 1068 1069 for (i = 0; i < nr_contexts; i++) { 1070 context = damon_sysfs_context_alloc(DAMON_OPS_VADDR); 1071 if (!context) { 1072 damon_sysfs_contexts_rm_dirs(contexts); 1073 return -ENOMEM; 1074 } 1075 1076 err = kobject_init_and_add(&context->kobj, 1077 &damon_sysfs_context_ktype, &contexts->kobj, 1078 "%d", i); 1079 if (err) 1080 goto out; 1081 1082 err = damon_sysfs_context_add_dirs(context); 1083 if (err) 1084 goto out; 1085 1086 contexts_arr[i] = context; 1087 contexts->nr++; 1088 } 1089 return 0; 1090 1091 out: 1092 damon_sysfs_contexts_rm_dirs(contexts); 1093 kobject_put(&context->kobj); 1094 return err; 1095 } 1096 1097 static ssize_t nr_contexts_show(struct kobject *kobj, 1098 struct kobj_attribute *attr, char *buf) 1099 { 1100 struct damon_sysfs_contexts *contexts = container_of(kobj, 1101 struct damon_sysfs_contexts, kobj); 1102 1103 return sysfs_emit(buf, "%d\n", contexts->nr); 1104 } 1105 1106 static ssize_t nr_contexts_store(struct kobject *kobj, 1107 struct kobj_attribute *attr, const char *buf, size_t count) 1108 { 1109 struct damon_sysfs_contexts *contexts; 1110 int nr, err; 1111 1112 err = kstrtoint(buf, 0, &nr); 1113 if (err) 1114 return err; 1115 /* TODO: support multiple contexts per kdamond */ 1116 if (nr < 0 || 1 < nr) 1117 return -EINVAL; 1118 1119 contexts = container_of(kobj, struct damon_sysfs_contexts, kobj); 1120 if (!mutex_trylock(&damon_sysfs_lock)) 1121 return -EBUSY; 1122 err = damon_sysfs_contexts_add_dirs(contexts, nr); 1123 mutex_unlock(&damon_sysfs_lock); 1124 if (err) 1125 return err; 1126 1127 return count; 1128 } 1129 1130 static void damon_sysfs_contexts_release(struct kobject *kobj) 1131 { 1132 kfree(container_of(kobj, struct damon_sysfs_contexts, kobj)); 1133 } 1134 1135 static struct kobj_attribute damon_sysfs_contexts_nr_attr 1136 = __ATTR_RW_MODE(nr_contexts, 0600); 1137 1138 static struct attribute *damon_sysfs_contexts_attrs[] = { 1139 &damon_sysfs_contexts_nr_attr.attr, 1140 NULL, 1141 }; 1142 ATTRIBUTE_GROUPS(damon_sysfs_contexts); 1143 1144 static const struct kobj_type damon_sysfs_contexts_ktype = { 1145 .release = damon_sysfs_contexts_release, 1146 .sysfs_ops = &kobj_sysfs_ops, 1147 .default_groups = damon_sysfs_contexts_groups, 1148 }; 1149 1150 /* 1151 * kdamond directory 1152 */ 1153 1154 struct damon_sysfs_kdamond { 1155 struct kobject kobj; 1156 struct damon_sysfs_contexts *contexts; 1157 struct damon_ctx *damon_ctx; 1158 unsigned int refresh_ms; 1159 }; 1160 1161 static struct damon_sysfs_kdamond *damon_sysfs_kdamond_alloc(void) 1162 { 1163 return kzalloc(sizeof(struct damon_sysfs_kdamond), GFP_KERNEL); 1164 } 1165 1166 static int damon_sysfs_kdamond_add_dirs(struct damon_sysfs_kdamond *kdamond) 1167 { 1168 struct damon_sysfs_contexts *contexts; 1169 int err; 1170 1171 contexts = damon_sysfs_contexts_alloc(); 1172 if (!contexts) 1173 return -ENOMEM; 1174 1175 err = kobject_init_and_add(&contexts->kobj, 1176 &damon_sysfs_contexts_ktype, &kdamond->kobj, 1177 "contexts"); 1178 if (err) { 1179 kobject_put(&contexts->kobj); 1180 return err; 1181 } 1182 kdamond->contexts = contexts; 1183 1184 return err; 1185 } 1186 1187 static void damon_sysfs_kdamond_rm_dirs(struct damon_sysfs_kdamond *kdamond) 1188 { 1189 damon_sysfs_contexts_rm_dirs(kdamond->contexts); 1190 kobject_put(&kdamond->contexts->kobj); 1191 } 1192 1193 /* 1194 * enum damon_sysfs_cmd - Commands for a specific kdamond. 1195 */ 1196 enum damon_sysfs_cmd { 1197 /* @DAMON_SYSFS_CMD_ON: Turn the kdamond on. */ 1198 DAMON_SYSFS_CMD_ON, 1199 /* @DAMON_SYSFS_CMD_OFF: Turn the kdamond off. */ 1200 DAMON_SYSFS_CMD_OFF, 1201 /* @DAMON_SYSFS_CMD_COMMIT: Update kdamond inputs. */ 1202 DAMON_SYSFS_CMD_COMMIT, 1203 /* 1204 * @DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS: Commit the quota goals 1205 * to DAMON. 1206 */ 1207 DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS, 1208 /* 1209 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS: Update scheme stats sysfs 1210 * files. 1211 */ 1212 DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS, 1213 /* 1214 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_BYTES: Update 1215 * tried_regions/total_bytes sysfs files for each scheme. 1216 */ 1217 DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_BYTES, 1218 /* 1219 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS: Update schemes tried 1220 * regions 1221 */ 1222 DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS, 1223 /* 1224 * @DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS: Clear schemes tried 1225 * regions 1226 */ 1227 DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS, 1228 /* 1229 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS: Update the 1230 * effective size quota of the scheme in bytes. 1231 */ 1232 DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS, 1233 /* 1234 * @DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS: Update the tuned monitoring 1235 * intevals. 1236 */ 1237 DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS, 1238 /* 1239 * @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands. 1240 */ 1241 NR_DAMON_SYSFS_CMDS, 1242 }; 1243 1244 /* Should match with enum damon_sysfs_cmd */ 1245 static const char * const damon_sysfs_cmd_strs[] = { 1246 "on", 1247 "off", 1248 "commit", 1249 "commit_schemes_quota_goals", 1250 "update_schemes_stats", 1251 "update_schemes_tried_bytes", 1252 "update_schemes_tried_regions", 1253 "clear_schemes_tried_regions", 1254 "update_schemes_effective_quotas", 1255 "update_tuned_intervals", 1256 }; 1257 1258 static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, 1259 char *buf) 1260 { 1261 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1262 struct damon_sysfs_kdamond, kobj); 1263 struct damon_ctx *ctx; 1264 bool running = false; 1265 1266 if (!mutex_trylock(&damon_sysfs_lock)) 1267 return -EBUSY; 1268 1269 ctx = kdamond->damon_ctx; 1270 if (ctx) 1271 running = damon_is_running(ctx); 1272 1273 mutex_unlock(&damon_sysfs_lock); 1274 1275 return sysfs_emit(buf, "%s\n", running ? 1276 damon_sysfs_cmd_strs[DAMON_SYSFS_CMD_ON] : 1277 damon_sysfs_cmd_strs[DAMON_SYSFS_CMD_OFF]); 1278 } 1279 1280 static int damon_sysfs_set_attrs(struct damon_ctx *ctx, 1281 struct damon_sysfs_attrs *sys_attrs) 1282 { 1283 struct damon_sysfs_intervals *sys_intervals = sys_attrs->intervals; 1284 struct damon_sysfs_intervals_goal *sys_goal = 1285 sys_intervals->intervals_goal; 1286 struct damon_sysfs_ul_range *sys_nr_regions = 1287 sys_attrs->nr_regions_range; 1288 struct damon_attrs attrs = { 1289 .sample_interval = sys_intervals->sample_us, 1290 .aggr_interval = sys_intervals->aggr_us, 1291 .intervals_goal = { 1292 .access_bp = sys_goal->access_bp, 1293 .aggrs = sys_goal->aggrs, 1294 .min_sample_us = sys_goal->min_sample_us, 1295 .max_sample_us = sys_goal->max_sample_us}, 1296 .ops_update_interval = sys_intervals->update_us, 1297 .min_nr_regions = sys_nr_regions->min, 1298 .max_nr_regions = sys_nr_regions->max, 1299 }; 1300 return damon_set_attrs(ctx, &attrs); 1301 } 1302 1303 static int damon_sysfs_set_regions(struct damon_target *t, 1304 struct damon_sysfs_regions *sysfs_regions) 1305 { 1306 struct damon_addr_range *ranges = kmalloc_array(sysfs_regions->nr, 1307 sizeof(*ranges), GFP_KERNEL | __GFP_NOWARN); 1308 int i, err = -EINVAL; 1309 1310 if (!ranges) 1311 return -ENOMEM; 1312 for (i = 0; i < sysfs_regions->nr; i++) { 1313 struct damon_sysfs_region *sys_region = 1314 sysfs_regions->regions_arr[i]; 1315 1316 if (sys_region->ar.start > sys_region->ar.end) 1317 goto out; 1318 1319 ranges[i].start = sys_region->ar.start; 1320 ranges[i].end = sys_region->ar.end; 1321 if (i == 0) 1322 continue; 1323 if (ranges[i - 1].end > ranges[i].start) 1324 goto out; 1325 } 1326 err = damon_set_regions(t, ranges, sysfs_regions->nr); 1327 out: 1328 kfree(ranges); 1329 return err; 1330 1331 } 1332 1333 static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target, 1334 struct damon_ctx *ctx) 1335 { 1336 struct damon_target *t = damon_new_target(); 1337 1338 if (!t) 1339 return -ENOMEM; 1340 damon_add_target(ctx, t); 1341 if (damon_target_has_pid(ctx)) { 1342 t->pid = find_get_pid(sys_target->pid); 1343 if (!t->pid) 1344 /* caller will destroy targets */ 1345 return -EINVAL; 1346 } 1347 return damon_sysfs_set_regions(t, sys_target->regions); 1348 } 1349 1350 static int damon_sysfs_add_targets(struct damon_ctx *ctx, 1351 struct damon_sysfs_targets *sysfs_targets) 1352 { 1353 int i, err; 1354 1355 /* Multiple physical address space monitoring targets makes no sense */ 1356 if (ctx->ops.id == DAMON_OPS_PADDR && sysfs_targets->nr > 1) 1357 return -EINVAL; 1358 1359 for (i = 0; i < sysfs_targets->nr; i++) { 1360 struct damon_sysfs_target *st = sysfs_targets->targets_arr[i]; 1361 1362 err = damon_sysfs_add_target(st, ctx); 1363 if (err) 1364 return err; 1365 } 1366 return 0; 1367 } 1368 1369 /* 1370 * damon_sysfs_upd_schemes_stats() - Update schemes stats sysfs files. 1371 * @data: The kobject wrapper that associated to the kdamond thread. 1372 * 1373 * This function reads the schemes stats of specific kdamond and update the 1374 * related values for sysfs files. This function should be called from DAMON 1375 * worker thread,to safely access the DAMON contexts-internal data. Caller 1376 * should also ensure holding ``damon_syfs_lock``, and ->damon_ctx of @data is 1377 * not NULL but a valid pointer, to safely access DAMON sysfs variables. 1378 */ 1379 static int damon_sysfs_upd_schemes_stats(void *data) 1380 { 1381 struct damon_sysfs_kdamond *kdamond = data; 1382 struct damon_ctx *ctx = kdamond->damon_ctx; 1383 1384 damon_sysfs_schemes_update_stats( 1385 kdamond->contexts->contexts_arr[0]->schemes, ctx); 1386 return 0; 1387 } 1388 1389 static inline bool damon_sysfs_kdamond_running( 1390 struct damon_sysfs_kdamond *kdamond) 1391 { 1392 return kdamond->damon_ctx && 1393 damon_is_running(kdamond->damon_ctx); 1394 } 1395 1396 static int damon_sysfs_apply_inputs(struct damon_ctx *ctx, 1397 struct damon_sysfs_context *sys_ctx) 1398 { 1399 int err; 1400 1401 err = damon_select_ops(ctx, sys_ctx->ops_id); 1402 if (err) 1403 return err; 1404 err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs); 1405 if (err) 1406 return err; 1407 err = damon_sysfs_add_targets(ctx, sys_ctx->targets); 1408 if (err) 1409 return err; 1410 return damon_sysfs_add_schemes(ctx, sys_ctx->schemes); 1411 } 1412 1413 static struct damon_ctx *damon_sysfs_build_ctx( 1414 struct damon_sysfs_context *sys_ctx); 1415 1416 /* 1417 * damon_sysfs_commit_input() - Commit user inputs to a running kdamond. 1418 * @kdamond: The kobject wrapper for the associated kdamond. 1419 * 1420 * Returns error if the sysfs input is wrong. 1421 */ 1422 static int damon_sysfs_commit_input(void *data) 1423 { 1424 struct damon_sysfs_kdamond *kdamond = data; 1425 struct damon_ctx *param_ctx, *test_ctx; 1426 int err; 1427 1428 if (!damon_sysfs_kdamond_running(kdamond)) 1429 return -EINVAL; 1430 /* TODO: Support multiple contexts per kdamond */ 1431 if (kdamond->contexts->nr != 1) 1432 return -EINVAL; 1433 1434 param_ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]); 1435 if (IS_ERR(param_ctx)) 1436 return PTR_ERR(param_ctx); 1437 test_ctx = damon_new_ctx(); 1438 err = damon_commit_ctx(test_ctx, param_ctx); 1439 if (err) { 1440 damon_destroy_ctx(test_ctx); 1441 goto out; 1442 } 1443 err = damon_commit_ctx(kdamond->damon_ctx, param_ctx); 1444 out: 1445 damon_destroy_ctx(param_ctx); 1446 return err; 1447 } 1448 1449 static int damon_sysfs_commit_schemes_quota_goals(void *data) 1450 { 1451 struct damon_sysfs_kdamond *sysfs_kdamond = data; 1452 struct damon_ctx *ctx; 1453 struct damon_sysfs_context *sysfs_ctx; 1454 1455 if (!damon_sysfs_kdamond_running(sysfs_kdamond)) 1456 return -EINVAL; 1457 /* TODO: Support multiple contexts per kdamond */ 1458 if (sysfs_kdamond->contexts->nr != 1) 1459 return -EINVAL; 1460 1461 ctx = sysfs_kdamond->damon_ctx; 1462 sysfs_ctx = sysfs_kdamond->contexts->contexts_arr[0]; 1463 return damos_sysfs_set_quota_scores(sysfs_ctx->schemes, ctx); 1464 } 1465 1466 /* 1467 * damon_sysfs_upd_schemes_effective_quotas() - Update schemes effective quotas 1468 * sysfs files. 1469 * @data: The kobject wrapper that associated to the kdamond thread. 1470 * 1471 * This function reads the schemes' effective quotas of specific kdamond and 1472 * update the related values for sysfs files. This function should be called 1473 * from DAMON callbacks while holding ``damon_syfs_lock``, to safely access the 1474 * DAMON contexts-internal data and DAMON sysfs variables. 1475 */ 1476 static int damon_sysfs_upd_schemes_effective_quotas(void *data) 1477 { 1478 struct damon_sysfs_kdamond *kdamond = data; 1479 struct damon_ctx *ctx = kdamond->damon_ctx; 1480 1481 damos_sysfs_update_effective_quotas( 1482 kdamond->contexts->contexts_arr[0]->schemes, ctx); 1483 return 0; 1484 } 1485 1486 static int damon_sysfs_upd_tuned_intervals(void *data) 1487 { 1488 struct damon_sysfs_kdamond *kdamond = data; 1489 struct damon_ctx *ctx = kdamond->damon_ctx; 1490 1491 kdamond->contexts->contexts_arr[0]->attrs->intervals->sample_us = 1492 ctx->attrs.sample_interval; 1493 kdamond->contexts->contexts_arr[0]->attrs->intervals->aggr_us = 1494 ctx->attrs.aggr_interval; 1495 return 0; 1496 } 1497 1498 static struct damon_ctx *damon_sysfs_build_ctx( 1499 struct damon_sysfs_context *sys_ctx) 1500 { 1501 struct damon_ctx *ctx = damon_new_ctx(); 1502 int err; 1503 1504 if (!ctx) 1505 return ERR_PTR(-ENOMEM); 1506 1507 err = damon_sysfs_apply_inputs(ctx, sys_ctx); 1508 if (err) { 1509 damon_destroy_ctx(ctx); 1510 return ERR_PTR(err); 1511 } 1512 1513 return ctx; 1514 } 1515 1516 static int damon_sysfs_repeat_call_fn(void *data) 1517 { 1518 struct damon_sysfs_kdamond *sysfs_kdamond = data; 1519 static unsigned long next_update_jiffies; 1520 1521 if (!sysfs_kdamond->refresh_ms) 1522 return 0; 1523 if (time_before(jiffies, next_update_jiffies)) 1524 return 0; 1525 next_update_jiffies = jiffies + 1526 msecs_to_jiffies(sysfs_kdamond->refresh_ms); 1527 1528 if (!mutex_trylock(&damon_sysfs_lock)) 1529 return 0; 1530 damon_sysfs_upd_tuned_intervals(sysfs_kdamond); 1531 damon_sysfs_upd_schemes_stats(sysfs_kdamond); 1532 damon_sysfs_upd_schemes_effective_quotas(sysfs_kdamond); 1533 mutex_unlock(&damon_sysfs_lock); 1534 return 0; 1535 } 1536 1537 static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond) 1538 { 1539 struct damon_ctx *ctx; 1540 struct damon_call_control *repeat_call_control; 1541 int err; 1542 1543 if (damon_sysfs_kdamond_running(kdamond)) 1544 return -EBUSY; 1545 /* TODO: support multiple contexts per kdamond */ 1546 if (kdamond->contexts->nr != 1) 1547 return -EINVAL; 1548 1549 if (kdamond->damon_ctx) 1550 damon_destroy_ctx(kdamond->damon_ctx); 1551 kdamond->damon_ctx = NULL; 1552 1553 repeat_call_control = kmalloc(sizeof(*repeat_call_control), 1554 GFP_KERNEL); 1555 if (!repeat_call_control) 1556 return -ENOMEM; 1557 1558 ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]); 1559 if (IS_ERR(ctx)) { 1560 kfree(repeat_call_control); 1561 return PTR_ERR(ctx); 1562 } 1563 err = damon_start(&ctx, 1, false); 1564 if (err) { 1565 kfree(repeat_call_control); 1566 damon_destroy_ctx(ctx); 1567 return err; 1568 } 1569 kdamond->damon_ctx = ctx; 1570 1571 repeat_call_control->fn = damon_sysfs_repeat_call_fn; 1572 repeat_call_control->data = kdamond; 1573 repeat_call_control->repeat = true; 1574 repeat_call_control->dealloc_on_cancel = true; 1575 damon_call(ctx, repeat_call_control); 1576 return err; 1577 } 1578 1579 static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond) 1580 { 1581 if (!kdamond->damon_ctx) 1582 return -EINVAL; 1583 return damon_stop(&kdamond->damon_ctx, 1); 1584 /* 1585 * To allow users show final monitoring results of already turned-off 1586 * DAMON, we free kdamond->damon_ctx in next 1587 * damon_sysfs_turn_damon_on(), or kdamonds_nr_store() 1588 */ 1589 } 1590 1591 static int damon_sysfs_damon_call(int (*fn)(void *data), 1592 struct damon_sysfs_kdamond *kdamond) 1593 { 1594 struct damon_call_control call_control = {}; 1595 int err; 1596 1597 if (!kdamond->damon_ctx) 1598 return -EINVAL; 1599 call_control.fn = fn; 1600 call_control.data = kdamond; 1601 err = damon_call(kdamond->damon_ctx, &call_control); 1602 return err ? err : call_control.return_code; 1603 } 1604 1605 struct damon_sysfs_schemes_walk_data { 1606 struct damon_sysfs_kdamond *sysfs_kdamond; 1607 bool total_bytes_only; 1608 }; 1609 1610 /* populate the region directory */ 1611 static void damon_sysfs_schemes_tried_regions_upd_one(void *data, struct damon_ctx *ctx, 1612 struct damon_target *t, struct damon_region *r, 1613 struct damos *s, unsigned long sz_filter_passed) 1614 { 1615 struct damon_sysfs_schemes_walk_data *walk_data = data; 1616 struct damon_sysfs_kdamond *sysfs_kdamond = walk_data->sysfs_kdamond; 1617 1618 damos_sysfs_populate_region_dir( 1619 sysfs_kdamond->contexts->contexts_arr[0]->schemes, 1620 ctx, t, r, s, walk_data->total_bytes_only, 1621 sz_filter_passed); 1622 } 1623 1624 static int damon_sysfs_update_schemes_tried_regions( 1625 struct damon_sysfs_kdamond *sysfs_kdamond, bool total_bytes_only) 1626 { 1627 struct damon_sysfs_schemes_walk_data walk_data = { 1628 .sysfs_kdamond = sysfs_kdamond, 1629 .total_bytes_only = total_bytes_only, 1630 }; 1631 struct damos_walk_control control = { 1632 .walk_fn = damon_sysfs_schemes_tried_regions_upd_one, 1633 .data = &walk_data, 1634 }; 1635 struct damon_ctx *ctx = sysfs_kdamond->damon_ctx; 1636 1637 if (!ctx) 1638 return -EINVAL; 1639 1640 damon_sysfs_schemes_clear_regions( 1641 sysfs_kdamond->contexts->contexts_arr[0]->schemes); 1642 return damos_walk(ctx, &control); 1643 } 1644 1645 /* 1646 * damon_sysfs_handle_cmd() - Handle a command for a specific kdamond. 1647 * @cmd: The command to handle. 1648 * @kdamond: The kobject wrapper for the associated kdamond. 1649 * 1650 * This function handles a DAMON sysfs command for a kdamond. 1651 * 1652 * Return: 0 on success, negative error code otherwise. 1653 */ 1654 static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd, 1655 struct damon_sysfs_kdamond *kdamond) 1656 { 1657 switch (cmd) { 1658 case DAMON_SYSFS_CMD_ON: 1659 return damon_sysfs_turn_damon_on(kdamond); 1660 case DAMON_SYSFS_CMD_OFF: 1661 return damon_sysfs_turn_damon_off(kdamond); 1662 case DAMON_SYSFS_CMD_COMMIT: 1663 return damon_sysfs_damon_call( 1664 damon_sysfs_commit_input, kdamond); 1665 case DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS: 1666 return damon_sysfs_damon_call( 1667 damon_sysfs_commit_schemes_quota_goals, 1668 kdamond); 1669 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS: 1670 return damon_sysfs_damon_call( 1671 damon_sysfs_upd_schemes_stats, kdamond); 1672 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_BYTES: 1673 return damon_sysfs_update_schemes_tried_regions(kdamond, true); 1674 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS: 1675 return damon_sysfs_update_schemes_tried_regions(kdamond, false); 1676 case DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS: 1677 return damon_sysfs_schemes_clear_regions( 1678 kdamond->contexts->contexts_arr[0]->schemes); 1679 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS: 1680 return damon_sysfs_damon_call( 1681 damon_sysfs_upd_schemes_effective_quotas, 1682 kdamond); 1683 case DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS: 1684 return damon_sysfs_damon_call( 1685 damon_sysfs_upd_tuned_intervals, kdamond); 1686 default: 1687 return -EINVAL; 1688 } 1689 } 1690 1691 static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, 1692 const char *buf, size_t count) 1693 { 1694 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1695 struct damon_sysfs_kdamond, kobj); 1696 enum damon_sysfs_cmd cmd; 1697 ssize_t ret = -EINVAL; 1698 1699 if (!mutex_trylock(&damon_sysfs_lock)) 1700 return -EBUSY; 1701 for (cmd = 0; cmd < NR_DAMON_SYSFS_CMDS; cmd++) { 1702 if (sysfs_streq(buf, damon_sysfs_cmd_strs[cmd])) { 1703 ret = damon_sysfs_handle_cmd(cmd, kdamond); 1704 break; 1705 } 1706 } 1707 mutex_unlock(&damon_sysfs_lock); 1708 if (!ret) 1709 ret = count; 1710 return ret; 1711 } 1712 1713 static ssize_t pid_show(struct kobject *kobj, 1714 struct kobj_attribute *attr, char *buf) 1715 { 1716 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1717 struct damon_sysfs_kdamond, kobj); 1718 struct damon_ctx *ctx; 1719 int pid = -1; 1720 1721 if (!mutex_trylock(&damon_sysfs_lock)) 1722 return -EBUSY; 1723 ctx = kdamond->damon_ctx; 1724 if (!ctx) 1725 goto out; 1726 1727 mutex_lock(&ctx->kdamond_lock); 1728 if (ctx->kdamond) 1729 pid = ctx->kdamond->pid; 1730 mutex_unlock(&ctx->kdamond_lock); 1731 out: 1732 mutex_unlock(&damon_sysfs_lock); 1733 return sysfs_emit(buf, "%d\n", pid); 1734 } 1735 1736 static ssize_t refresh_ms_show(struct kobject *kobj, 1737 struct kobj_attribute *attr, char *buf) 1738 { 1739 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1740 struct damon_sysfs_kdamond, kobj); 1741 1742 return sysfs_emit(buf, "%u\n", kdamond->refresh_ms); 1743 } 1744 1745 static ssize_t refresh_ms_store(struct kobject *kobj, 1746 struct kobj_attribute *attr, const char *buf, size_t count) 1747 { 1748 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1749 struct damon_sysfs_kdamond, kobj); 1750 unsigned int nr; 1751 int err = kstrtouint(buf, 0, &nr); 1752 1753 if (err) 1754 return err; 1755 1756 kdamond->refresh_ms = nr; 1757 return count; 1758 } 1759 1760 static void damon_sysfs_kdamond_release(struct kobject *kobj) 1761 { 1762 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1763 struct damon_sysfs_kdamond, kobj); 1764 1765 if (kdamond->damon_ctx) 1766 damon_destroy_ctx(kdamond->damon_ctx); 1767 kfree(kdamond); 1768 } 1769 1770 static struct kobj_attribute damon_sysfs_kdamond_state_attr = 1771 __ATTR_RW_MODE(state, 0600); 1772 1773 static struct kobj_attribute damon_sysfs_kdamond_pid_attr = 1774 __ATTR_RO_MODE(pid, 0400); 1775 1776 static struct kobj_attribute damon_sysfs_kdamond_refresh_ms_attr = 1777 __ATTR_RW_MODE(refresh_ms, 0600); 1778 1779 static struct attribute *damon_sysfs_kdamond_attrs[] = { 1780 &damon_sysfs_kdamond_state_attr.attr, 1781 &damon_sysfs_kdamond_pid_attr.attr, 1782 &damon_sysfs_kdamond_refresh_ms_attr.attr, 1783 NULL, 1784 }; 1785 ATTRIBUTE_GROUPS(damon_sysfs_kdamond); 1786 1787 static const struct kobj_type damon_sysfs_kdamond_ktype = { 1788 .release = damon_sysfs_kdamond_release, 1789 .sysfs_ops = &kobj_sysfs_ops, 1790 .default_groups = damon_sysfs_kdamond_groups, 1791 }; 1792 1793 /* 1794 * kdamonds directory 1795 */ 1796 1797 struct damon_sysfs_kdamonds { 1798 struct kobject kobj; 1799 struct damon_sysfs_kdamond **kdamonds_arr; 1800 int nr; 1801 }; 1802 1803 static struct damon_sysfs_kdamonds *damon_sysfs_kdamonds_alloc(void) 1804 { 1805 return kzalloc(sizeof(struct damon_sysfs_kdamonds), GFP_KERNEL); 1806 } 1807 1808 static void damon_sysfs_kdamonds_rm_dirs(struct damon_sysfs_kdamonds *kdamonds) 1809 { 1810 struct damon_sysfs_kdamond **kdamonds_arr = kdamonds->kdamonds_arr; 1811 int i; 1812 1813 for (i = 0; i < kdamonds->nr; i++) { 1814 damon_sysfs_kdamond_rm_dirs(kdamonds_arr[i]); 1815 kobject_put(&kdamonds_arr[i]->kobj); 1816 } 1817 kdamonds->nr = 0; 1818 kfree(kdamonds_arr); 1819 kdamonds->kdamonds_arr = NULL; 1820 } 1821 1822 static bool damon_sysfs_kdamonds_busy(struct damon_sysfs_kdamond **kdamonds, 1823 int nr_kdamonds) 1824 { 1825 int i; 1826 1827 for (i = 0; i < nr_kdamonds; i++) { 1828 if (damon_sysfs_kdamond_running(kdamonds[i])) 1829 return true; 1830 } 1831 1832 return false; 1833 } 1834 1835 static int damon_sysfs_kdamonds_add_dirs(struct damon_sysfs_kdamonds *kdamonds, 1836 int nr_kdamonds) 1837 { 1838 struct damon_sysfs_kdamond **kdamonds_arr, *kdamond; 1839 int err, i; 1840 1841 if (damon_sysfs_kdamonds_busy(kdamonds->kdamonds_arr, kdamonds->nr)) 1842 return -EBUSY; 1843 1844 damon_sysfs_kdamonds_rm_dirs(kdamonds); 1845 if (!nr_kdamonds) 1846 return 0; 1847 1848 kdamonds_arr = kmalloc_array(nr_kdamonds, sizeof(*kdamonds_arr), 1849 GFP_KERNEL | __GFP_NOWARN); 1850 if (!kdamonds_arr) 1851 return -ENOMEM; 1852 kdamonds->kdamonds_arr = kdamonds_arr; 1853 1854 for (i = 0; i < nr_kdamonds; i++) { 1855 kdamond = damon_sysfs_kdamond_alloc(); 1856 if (!kdamond) { 1857 damon_sysfs_kdamonds_rm_dirs(kdamonds); 1858 return -ENOMEM; 1859 } 1860 1861 err = kobject_init_and_add(&kdamond->kobj, 1862 &damon_sysfs_kdamond_ktype, &kdamonds->kobj, 1863 "%d", i); 1864 if (err) 1865 goto out; 1866 1867 err = damon_sysfs_kdamond_add_dirs(kdamond); 1868 if (err) 1869 goto out; 1870 1871 kdamonds_arr[i] = kdamond; 1872 kdamonds->nr++; 1873 } 1874 return 0; 1875 1876 out: 1877 damon_sysfs_kdamonds_rm_dirs(kdamonds); 1878 kobject_put(&kdamond->kobj); 1879 return err; 1880 } 1881 1882 static ssize_t nr_kdamonds_show(struct kobject *kobj, 1883 struct kobj_attribute *attr, char *buf) 1884 { 1885 struct damon_sysfs_kdamonds *kdamonds = container_of(kobj, 1886 struct damon_sysfs_kdamonds, kobj); 1887 1888 return sysfs_emit(buf, "%d\n", kdamonds->nr); 1889 } 1890 1891 static ssize_t nr_kdamonds_store(struct kobject *kobj, 1892 struct kobj_attribute *attr, const char *buf, size_t count) 1893 { 1894 struct damon_sysfs_kdamonds *kdamonds; 1895 int nr, err; 1896 1897 err = kstrtoint(buf, 0, &nr); 1898 if (err) 1899 return err; 1900 if (nr < 0) 1901 return -EINVAL; 1902 1903 kdamonds = container_of(kobj, struct damon_sysfs_kdamonds, kobj); 1904 1905 if (!mutex_trylock(&damon_sysfs_lock)) 1906 return -EBUSY; 1907 err = damon_sysfs_kdamonds_add_dirs(kdamonds, nr); 1908 mutex_unlock(&damon_sysfs_lock); 1909 if (err) 1910 return err; 1911 1912 return count; 1913 } 1914 1915 static void damon_sysfs_kdamonds_release(struct kobject *kobj) 1916 { 1917 kfree(container_of(kobj, struct damon_sysfs_kdamonds, kobj)); 1918 } 1919 1920 static struct kobj_attribute damon_sysfs_kdamonds_nr_attr = 1921 __ATTR_RW_MODE(nr_kdamonds, 0600); 1922 1923 static struct attribute *damon_sysfs_kdamonds_attrs[] = { 1924 &damon_sysfs_kdamonds_nr_attr.attr, 1925 NULL, 1926 }; 1927 ATTRIBUTE_GROUPS(damon_sysfs_kdamonds); 1928 1929 static const struct kobj_type damon_sysfs_kdamonds_ktype = { 1930 .release = damon_sysfs_kdamonds_release, 1931 .sysfs_ops = &kobj_sysfs_ops, 1932 .default_groups = damon_sysfs_kdamonds_groups, 1933 }; 1934 1935 /* 1936 * damon user interface directory 1937 */ 1938 1939 struct damon_sysfs_ui_dir { 1940 struct kobject kobj; 1941 struct damon_sysfs_kdamonds *kdamonds; 1942 }; 1943 1944 static struct damon_sysfs_ui_dir *damon_sysfs_ui_dir_alloc(void) 1945 { 1946 return kzalloc(sizeof(struct damon_sysfs_ui_dir), GFP_KERNEL); 1947 } 1948 1949 static int damon_sysfs_ui_dir_add_dirs(struct damon_sysfs_ui_dir *ui_dir) 1950 { 1951 struct damon_sysfs_kdamonds *kdamonds; 1952 int err; 1953 1954 kdamonds = damon_sysfs_kdamonds_alloc(); 1955 if (!kdamonds) 1956 return -ENOMEM; 1957 1958 err = kobject_init_and_add(&kdamonds->kobj, 1959 &damon_sysfs_kdamonds_ktype, &ui_dir->kobj, 1960 "kdamonds"); 1961 if (err) { 1962 kobject_put(&kdamonds->kobj); 1963 return err; 1964 } 1965 ui_dir->kdamonds = kdamonds; 1966 return err; 1967 } 1968 1969 static void damon_sysfs_ui_dir_release(struct kobject *kobj) 1970 { 1971 kfree(container_of(kobj, struct damon_sysfs_ui_dir, kobj)); 1972 } 1973 1974 static struct attribute *damon_sysfs_ui_dir_attrs[] = { 1975 NULL, 1976 }; 1977 ATTRIBUTE_GROUPS(damon_sysfs_ui_dir); 1978 1979 static const struct kobj_type damon_sysfs_ui_dir_ktype = { 1980 .release = damon_sysfs_ui_dir_release, 1981 .sysfs_ops = &kobj_sysfs_ops, 1982 .default_groups = damon_sysfs_ui_dir_groups, 1983 }; 1984 1985 static int __init damon_sysfs_init(void) 1986 { 1987 struct kobject *damon_sysfs_root; 1988 struct damon_sysfs_ui_dir *admin; 1989 int err; 1990 1991 damon_sysfs_root = kobject_create_and_add("damon", mm_kobj); 1992 if (!damon_sysfs_root) 1993 return -ENOMEM; 1994 1995 admin = damon_sysfs_ui_dir_alloc(); 1996 if (!admin) { 1997 kobject_put(damon_sysfs_root); 1998 return -ENOMEM; 1999 } 2000 err = kobject_init_and_add(&admin->kobj, &damon_sysfs_ui_dir_ktype, 2001 damon_sysfs_root, "admin"); 2002 if (err) 2003 goto out; 2004 err = damon_sysfs_ui_dir_add_dirs(admin); 2005 if (err) 2006 goto out; 2007 return 0; 2008 2009 out: 2010 kobject_put(&admin->kobj); 2011 kobject_put(damon_sysfs_root); 2012 return err; 2013 } 2014 subsys_initcall(damon_sysfs_init); 2015 2016 #include "tests/sysfs-kunit.h" 2017