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 unsigned long addr_unit; 838 struct damon_sysfs_attrs *attrs; 839 struct damon_sysfs_targets *targets; 840 struct damon_sysfs_schemes *schemes; 841 }; 842 843 static struct damon_sysfs_context *damon_sysfs_context_alloc( 844 enum damon_ops_id ops_id) 845 { 846 struct damon_sysfs_context *context = kmalloc(sizeof(*context), 847 GFP_KERNEL); 848 849 if (!context) 850 return NULL; 851 context->kobj = (struct kobject){}; 852 context->ops_id = ops_id; 853 context->addr_unit = 1; 854 return context; 855 } 856 857 static int damon_sysfs_context_set_attrs(struct damon_sysfs_context *context) 858 { 859 struct damon_sysfs_attrs *attrs = damon_sysfs_attrs_alloc(); 860 int err; 861 862 if (!attrs) 863 return -ENOMEM; 864 err = kobject_init_and_add(&attrs->kobj, &damon_sysfs_attrs_ktype, 865 &context->kobj, "monitoring_attrs"); 866 if (err) 867 goto out; 868 err = damon_sysfs_attrs_add_dirs(attrs); 869 if (err) 870 goto out; 871 context->attrs = attrs; 872 return 0; 873 874 out: 875 kobject_put(&attrs->kobj); 876 return err; 877 } 878 879 static int damon_sysfs_context_set_targets(struct damon_sysfs_context *context) 880 { 881 struct damon_sysfs_targets *targets = damon_sysfs_targets_alloc(); 882 int err; 883 884 if (!targets) 885 return -ENOMEM; 886 err = kobject_init_and_add(&targets->kobj, &damon_sysfs_targets_ktype, 887 &context->kobj, "targets"); 888 if (err) { 889 kobject_put(&targets->kobj); 890 return err; 891 } 892 context->targets = targets; 893 return 0; 894 } 895 896 static int damon_sysfs_context_set_schemes(struct damon_sysfs_context *context) 897 { 898 struct damon_sysfs_schemes *schemes = damon_sysfs_schemes_alloc(); 899 int err; 900 901 if (!schemes) 902 return -ENOMEM; 903 err = kobject_init_and_add(&schemes->kobj, &damon_sysfs_schemes_ktype, 904 &context->kobj, "schemes"); 905 if (err) { 906 kobject_put(&schemes->kobj); 907 return err; 908 } 909 context->schemes = schemes; 910 return 0; 911 } 912 913 static int damon_sysfs_context_add_dirs(struct damon_sysfs_context *context) 914 { 915 int err; 916 917 err = damon_sysfs_context_set_attrs(context); 918 if (err) 919 return err; 920 921 err = damon_sysfs_context_set_targets(context); 922 if (err) 923 goto put_attrs_out; 924 925 err = damon_sysfs_context_set_schemes(context); 926 if (err) 927 goto put_targets_attrs_out; 928 return 0; 929 930 put_targets_attrs_out: 931 kobject_put(&context->targets->kobj); 932 context->targets = NULL; 933 put_attrs_out: 934 kobject_put(&context->attrs->kobj); 935 context->attrs = NULL; 936 return err; 937 } 938 939 static void damon_sysfs_context_rm_dirs(struct damon_sysfs_context *context) 940 { 941 damon_sysfs_attrs_rm_dirs(context->attrs); 942 kobject_put(&context->attrs->kobj); 943 damon_sysfs_targets_rm_dirs(context->targets); 944 kobject_put(&context->targets->kobj); 945 damon_sysfs_schemes_rm_dirs(context->schemes); 946 kobject_put(&context->schemes->kobj); 947 } 948 949 static ssize_t avail_operations_show(struct kobject *kobj, 950 struct kobj_attribute *attr, char *buf) 951 { 952 int len = 0; 953 int i; 954 955 for (i = 0; i < ARRAY_SIZE(damon_sysfs_ops_names); i++) { 956 const struct damon_sysfs_ops_name *ops_name; 957 958 ops_name = &damon_sysfs_ops_names[i]; 959 if (!damon_is_registered_ops(ops_name->ops_id)) 960 continue; 961 len += sysfs_emit_at(buf, len, "%s\n", ops_name->name); 962 } 963 return len; 964 } 965 966 static ssize_t operations_show(struct kobject *kobj, 967 struct kobj_attribute *attr, char *buf) 968 { 969 struct damon_sysfs_context *context = container_of(kobj, 970 struct damon_sysfs_context, kobj); 971 int i; 972 973 for (i = 0; i < ARRAY_SIZE(damon_sysfs_ops_names); i++) { 974 const struct damon_sysfs_ops_name *ops_name; 975 976 ops_name = &damon_sysfs_ops_names[i]; 977 if (ops_name->ops_id == context->ops_id) 978 return sysfs_emit(buf, "%s\n", ops_name->name); 979 } 980 return -EINVAL; 981 } 982 983 static ssize_t operations_store(struct kobject *kobj, 984 struct kobj_attribute *attr, const char *buf, size_t count) 985 { 986 struct damon_sysfs_context *context = container_of(kobj, 987 struct damon_sysfs_context, kobj); 988 int i; 989 990 for (i = 0; i < ARRAY_SIZE(damon_sysfs_ops_names); i++) { 991 const struct damon_sysfs_ops_name *ops_name; 992 993 ops_name = &damon_sysfs_ops_names[i]; 994 if (sysfs_streq(buf, ops_name->name)) { 995 context->ops_id = ops_name->ops_id; 996 return count; 997 } 998 } 999 return -EINVAL; 1000 } 1001 1002 static ssize_t addr_unit_show(struct kobject *kobj, 1003 struct kobj_attribute *attr, char *buf) 1004 { 1005 struct damon_sysfs_context *context = container_of(kobj, 1006 struct damon_sysfs_context, kobj); 1007 1008 return sysfs_emit(buf, "%lu\n", context->addr_unit); 1009 } 1010 1011 static ssize_t addr_unit_store(struct kobject *kobj, 1012 struct kobj_attribute *attr, const char *buf, size_t count) 1013 { 1014 struct damon_sysfs_context *context = container_of(kobj, 1015 struct damon_sysfs_context, kobj); 1016 unsigned long input_addr_unit; 1017 int err = kstrtoul(buf, 0, &input_addr_unit); 1018 1019 if (err) 1020 return err; 1021 if (!input_addr_unit) 1022 return -EINVAL; 1023 1024 context->addr_unit = input_addr_unit; 1025 return count; 1026 } 1027 1028 static void damon_sysfs_context_release(struct kobject *kobj) 1029 { 1030 kfree(container_of(kobj, struct damon_sysfs_context, kobj)); 1031 } 1032 1033 static struct kobj_attribute damon_sysfs_context_avail_operations_attr = 1034 __ATTR_RO_MODE(avail_operations, 0400); 1035 1036 static struct kobj_attribute damon_sysfs_context_operations_attr = 1037 __ATTR_RW_MODE(operations, 0600); 1038 1039 static struct kobj_attribute damon_sysfs_context_addr_unit_attr = 1040 __ATTR_RW_MODE(addr_unit, 0600); 1041 1042 static struct attribute *damon_sysfs_context_attrs[] = { 1043 &damon_sysfs_context_avail_operations_attr.attr, 1044 &damon_sysfs_context_operations_attr.attr, 1045 &damon_sysfs_context_addr_unit_attr.attr, 1046 NULL, 1047 }; 1048 ATTRIBUTE_GROUPS(damon_sysfs_context); 1049 1050 static const struct kobj_type damon_sysfs_context_ktype = { 1051 .release = damon_sysfs_context_release, 1052 .sysfs_ops = &kobj_sysfs_ops, 1053 .default_groups = damon_sysfs_context_groups, 1054 }; 1055 1056 /* 1057 * contexts directory 1058 */ 1059 1060 struct damon_sysfs_contexts { 1061 struct kobject kobj; 1062 struct damon_sysfs_context **contexts_arr; 1063 int nr; 1064 }; 1065 1066 static struct damon_sysfs_contexts *damon_sysfs_contexts_alloc(void) 1067 { 1068 return kzalloc(sizeof(struct damon_sysfs_contexts), GFP_KERNEL); 1069 } 1070 1071 static void damon_sysfs_contexts_rm_dirs(struct damon_sysfs_contexts *contexts) 1072 { 1073 struct damon_sysfs_context **contexts_arr = contexts->contexts_arr; 1074 int i; 1075 1076 for (i = 0; i < contexts->nr; i++) { 1077 damon_sysfs_context_rm_dirs(contexts_arr[i]); 1078 kobject_put(&contexts_arr[i]->kobj); 1079 } 1080 contexts->nr = 0; 1081 kfree(contexts_arr); 1082 contexts->contexts_arr = NULL; 1083 } 1084 1085 static int damon_sysfs_contexts_add_dirs(struct damon_sysfs_contexts *contexts, 1086 int nr_contexts) 1087 { 1088 struct damon_sysfs_context **contexts_arr, *context; 1089 int err, i; 1090 1091 damon_sysfs_contexts_rm_dirs(contexts); 1092 if (!nr_contexts) 1093 return 0; 1094 1095 contexts_arr = kmalloc_array(nr_contexts, sizeof(*contexts_arr), 1096 GFP_KERNEL | __GFP_NOWARN); 1097 if (!contexts_arr) 1098 return -ENOMEM; 1099 contexts->contexts_arr = contexts_arr; 1100 1101 for (i = 0; i < nr_contexts; i++) { 1102 context = damon_sysfs_context_alloc(DAMON_OPS_VADDR); 1103 if (!context) { 1104 damon_sysfs_contexts_rm_dirs(contexts); 1105 return -ENOMEM; 1106 } 1107 1108 err = kobject_init_and_add(&context->kobj, 1109 &damon_sysfs_context_ktype, &contexts->kobj, 1110 "%d", i); 1111 if (err) 1112 goto out; 1113 1114 err = damon_sysfs_context_add_dirs(context); 1115 if (err) 1116 goto out; 1117 1118 contexts_arr[i] = context; 1119 contexts->nr++; 1120 } 1121 return 0; 1122 1123 out: 1124 damon_sysfs_contexts_rm_dirs(contexts); 1125 kobject_put(&context->kobj); 1126 return err; 1127 } 1128 1129 static ssize_t nr_contexts_show(struct kobject *kobj, 1130 struct kobj_attribute *attr, char *buf) 1131 { 1132 struct damon_sysfs_contexts *contexts = container_of(kobj, 1133 struct damon_sysfs_contexts, kobj); 1134 1135 return sysfs_emit(buf, "%d\n", contexts->nr); 1136 } 1137 1138 static ssize_t nr_contexts_store(struct kobject *kobj, 1139 struct kobj_attribute *attr, const char *buf, size_t count) 1140 { 1141 struct damon_sysfs_contexts *contexts; 1142 int nr, err; 1143 1144 err = kstrtoint(buf, 0, &nr); 1145 if (err) 1146 return err; 1147 /* TODO: support multiple contexts per kdamond */ 1148 if (nr < 0 || 1 < nr) 1149 return -EINVAL; 1150 1151 contexts = container_of(kobj, struct damon_sysfs_contexts, kobj); 1152 if (!mutex_trylock(&damon_sysfs_lock)) 1153 return -EBUSY; 1154 err = damon_sysfs_contexts_add_dirs(contexts, nr); 1155 mutex_unlock(&damon_sysfs_lock); 1156 if (err) 1157 return err; 1158 1159 return count; 1160 } 1161 1162 static void damon_sysfs_contexts_release(struct kobject *kobj) 1163 { 1164 kfree(container_of(kobj, struct damon_sysfs_contexts, kobj)); 1165 } 1166 1167 static struct kobj_attribute damon_sysfs_contexts_nr_attr 1168 = __ATTR_RW_MODE(nr_contexts, 0600); 1169 1170 static struct attribute *damon_sysfs_contexts_attrs[] = { 1171 &damon_sysfs_contexts_nr_attr.attr, 1172 NULL, 1173 }; 1174 ATTRIBUTE_GROUPS(damon_sysfs_contexts); 1175 1176 static const struct kobj_type damon_sysfs_contexts_ktype = { 1177 .release = damon_sysfs_contexts_release, 1178 .sysfs_ops = &kobj_sysfs_ops, 1179 .default_groups = damon_sysfs_contexts_groups, 1180 }; 1181 1182 /* 1183 * kdamond directory 1184 */ 1185 1186 struct damon_sysfs_kdamond { 1187 struct kobject kobj; 1188 struct damon_sysfs_contexts *contexts; 1189 struct damon_ctx *damon_ctx; 1190 unsigned int refresh_ms; 1191 }; 1192 1193 static struct damon_sysfs_kdamond *damon_sysfs_kdamond_alloc(void) 1194 { 1195 return kzalloc(sizeof(struct damon_sysfs_kdamond), GFP_KERNEL); 1196 } 1197 1198 static int damon_sysfs_kdamond_add_dirs(struct damon_sysfs_kdamond *kdamond) 1199 { 1200 struct damon_sysfs_contexts *contexts; 1201 int err; 1202 1203 contexts = damon_sysfs_contexts_alloc(); 1204 if (!contexts) 1205 return -ENOMEM; 1206 1207 err = kobject_init_and_add(&contexts->kobj, 1208 &damon_sysfs_contexts_ktype, &kdamond->kobj, 1209 "contexts"); 1210 if (err) { 1211 kobject_put(&contexts->kobj); 1212 return err; 1213 } 1214 kdamond->contexts = contexts; 1215 1216 return err; 1217 } 1218 1219 static void damon_sysfs_kdamond_rm_dirs(struct damon_sysfs_kdamond *kdamond) 1220 { 1221 damon_sysfs_contexts_rm_dirs(kdamond->contexts); 1222 kobject_put(&kdamond->contexts->kobj); 1223 } 1224 1225 /* 1226 * enum damon_sysfs_cmd - Commands for a specific kdamond. 1227 */ 1228 enum damon_sysfs_cmd { 1229 /* @DAMON_SYSFS_CMD_ON: Turn the kdamond on. */ 1230 DAMON_SYSFS_CMD_ON, 1231 /* @DAMON_SYSFS_CMD_OFF: Turn the kdamond off. */ 1232 DAMON_SYSFS_CMD_OFF, 1233 /* @DAMON_SYSFS_CMD_COMMIT: Update kdamond inputs. */ 1234 DAMON_SYSFS_CMD_COMMIT, 1235 /* 1236 * @DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS: Commit the quota goals 1237 * to DAMON. 1238 */ 1239 DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS, 1240 /* 1241 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS: Update scheme stats sysfs 1242 * files. 1243 */ 1244 DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS, 1245 /* 1246 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_BYTES: Update 1247 * tried_regions/total_bytes sysfs files for each scheme. 1248 */ 1249 DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_BYTES, 1250 /* 1251 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS: Update schemes tried 1252 * regions 1253 */ 1254 DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS, 1255 /* 1256 * @DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS: Clear schemes tried 1257 * regions 1258 */ 1259 DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS, 1260 /* 1261 * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS: Update the 1262 * effective size quota of the scheme in bytes. 1263 */ 1264 DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS, 1265 /* 1266 * @DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS: Update the tuned monitoring 1267 * intevals. 1268 */ 1269 DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS, 1270 /* 1271 * @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands. 1272 */ 1273 NR_DAMON_SYSFS_CMDS, 1274 }; 1275 1276 /* Should match with enum damon_sysfs_cmd */ 1277 static const char * const damon_sysfs_cmd_strs[] = { 1278 "on", 1279 "off", 1280 "commit", 1281 "commit_schemes_quota_goals", 1282 "update_schemes_stats", 1283 "update_schemes_tried_bytes", 1284 "update_schemes_tried_regions", 1285 "clear_schemes_tried_regions", 1286 "update_schemes_effective_quotas", 1287 "update_tuned_intervals", 1288 }; 1289 1290 static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, 1291 char *buf) 1292 { 1293 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1294 struct damon_sysfs_kdamond, kobj); 1295 struct damon_ctx *ctx = kdamond->damon_ctx; 1296 bool running; 1297 1298 if (!ctx) 1299 running = false; 1300 else 1301 running = damon_is_running(ctx); 1302 1303 return sysfs_emit(buf, "%s\n", running ? 1304 damon_sysfs_cmd_strs[DAMON_SYSFS_CMD_ON] : 1305 damon_sysfs_cmd_strs[DAMON_SYSFS_CMD_OFF]); 1306 } 1307 1308 static int damon_sysfs_set_attrs(struct damon_ctx *ctx, 1309 struct damon_sysfs_attrs *sys_attrs) 1310 { 1311 struct damon_sysfs_intervals *sys_intervals = sys_attrs->intervals; 1312 struct damon_sysfs_intervals_goal *sys_goal = 1313 sys_intervals->intervals_goal; 1314 struct damon_sysfs_ul_range *sys_nr_regions = 1315 sys_attrs->nr_regions_range; 1316 struct damon_attrs attrs = { 1317 .sample_interval = sys_intervals->sample_us, 1318 .aggr_interval = sys_intervals->aggr_us, 1319 .intervals_goal = { 1320 .access_bp = sys_goal->access_bp, 1321 .aggrs = sys_goal->aggrs, 1322 .min_sample_us = sys_goal->min_sample_us, 1323 .max_sample_us = sys_goal->max_sample_us}, 1324 .ops_update_interval = sys_intervals->update_us, 1325 .min_nr_regions = sys_nr_regions->min, 1326 .max_nr_regions = sys_nr_regions->max, 1327 }; 1328 return damon_set_attrs(ctx, &attrs); 1329 } 1330 1331 static int damon_sysfs_set_regions(struct damon_target *t, 1332 struct damon_sysfs_regions *sysfs_regions, 1333 unsigned long min_sz_region) 1334 { 1335 struct damon_addr_range *ranges = kmalloc_array(sysfs_regions->nr, 1336 sizeof(*ranges), GFP_KERNEL | __GFP_NOWARN); 1337 int i, err = -EINVAL; 1338 1339 if (!ranges) 1340 return -ENOMEM; 1341 for (i = 0; i < sysfs_regions->nr; i++) { 1342 struct damon_sysfs_region *sys_region = 1343 sysfs_regions->regions_arr[i]; 1344 1345 if (sys_region->ar.start > sys_region->ar.end) 1346 goto out; 1347 1348 ranges[i].start = sys_region->ar.start; 1349 ranges[i].end = sys_region->ar.end; 1350 if (i == 0) 1351 continue; 1352 if (ranges[i - 1].end > ranges[i].start) 1353 goto out; 1354 } 1355 err = damon_set_regions(t, ranges, sysfs_regions->nr, min_sz_region); 1356 out: 1357 kfree(ranges); 1358 return err; 1359 1360 } 1361 1362 static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target, 1363 struct damon_ctx *ctx) 1364 { 1365 struct damon_target *t = damon_new_target(); 1366 1367 if (!t) 1368 return -ENOMEM; 1369 damon_add_target(ctx, t); 1370 if (damon_target_has_pid(ctx)) { 1371 t->pid = find_get_pid(sys_target->pid); 1372 if (!t->pid) 1373 /* caller will destroy targets */ 1374 return -EINVAL; 1375 } 1376 return damon_sysfs_set_regions(t, sys_target->regions, ctx->min_sz_region); 1377 } 1378 1379 static int damon_sysfs_add_targets(struct damon_ctx *ctx, 1380 struct damon_sysfs_targets *sysfs_targets) 1381 { 1382 int i, err; 1383 1384 /* Multiple physical address space monitoring targets makes no sense */ 1385 if (ctx->ops.id == DAMON_OPS_PADDR && sysfs_targets->nr > 1) 1386 return -EINVAL; 1387 1388 for (i = 0; i < sysfs_targets->nr; i++) { 1389 struct damon_sysfs_target *st = sysfs_targets->targets_arr[i]; 1390 1391 err = damon_sysfs_add_target(st, ctx); 1392 if (err) 1393 return err; 1394 } 1395 return 0; 1396 } 1397 1398 /* 1399 * damon_sysfs_upd_schemes_stats() - Update schemes stats sysfs files. 1400 * @data: The kobject wrapper that associated to the kdamond thread. 1401 * 1402 * This function reads the schemes stats of specific kdamond and update the 1403 * related values for sysfs files. This function should be called from DAMON 1404 * worker thread,to safely access the DAMON contexts-internal data. Caller 1405 * should also ensure holding ``damon_syfs_lock``, and ->damon_ctx of @data is 1406 * not NULL but a valid pointer, to safely access DAMON sysfs variables. 1407 */ 1408 static int damon_sysfs_upd_schemes_stats(void *data) 1409 { 1410 struct damon_sysfs_kdamond *kdamond = data; 1411 struct damon_ctx *ctx = kdamond->damon_ctx; 1412 1413 damon_sysfs_schemes_update_stats( 1414 kdamond->contexts->contexts_arr[0]->schemes, ctx); 1415 return 0; 1416 } 1417 1418 static inline bool damon_sysfs_kdamond_running( 1419 struct damon_sysfs_kdamond *kdamond) 1420 { 1421 return kdamond->damon_ctx && 1422 damon_is_running(kdamond->damon_ctx); 1423 } 1424 1425 static int damon_sysfs_apply_inputs(struct damon_ctx *ctx, 1426 struct damon_sysfs_context *sys_ctx) 1427 { 1428 int err; 1429 1430 err = damon_select_ops(ctx, sys_ctx->ops_id); 1431 if (err) 1432 return err; 1433 ctx->addr_unit = sys_ctx->addr_unit; 1434 ctx->min_sz_region = max(DAMON_MIN_REGION / sys_ctx->addr_unit, 1); 1435 err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs); 1436 if (err) 1437 return err; 1438 err = damon_sysfs_add_targets(ctx, sys_ctx->targets); 1439 if (err) 1440 return err; 1441 return damon_sysfs_add_schemes(ctx, sys_ctx->schemes); 1442 } 1443 1444 static struct damon_ctx *damon_sysfs_build_ctx( 1445 struct damon_sysfs_context *sys_ctx); 1446 1447 /* 1448 * damon_sysfs_commit_input() - Commit user inputs to a running kdamond. 1449 * @kdamond: The kobject wrapper for the associated kdamond. 1450 * 1451 * Returns error if the sysfs input is wrong. 1452 */ 1453 static int damon_sysfs_commit_input(void *data) 1454 { 1455 struct damon_sysfs_kdamond *kdamond = data; 1456 struct damon_ctx *param_ctx, *test_ctx; 1457 int err; 1458 1459 if (!damon_sysfs_kdamond_running(kdamond)) 1460 return -EINVAL; 1461 /* TODO: Support multiple contexts per kdamond */ 1462 if (kdamond->contexts->nr != 1) 1463 return -EINVAL; 1464 1465 param_ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]); 1466 if (IS_ERR(param_ctx)) 1467 return PTR_ERR(param_ctx); 1468 test_ctx = damon_new_ctx(); 1469 err = damon_commit_ctx(test_ctx, param_ctx); 1470 if (err) { 1471 damon_destroy_ctx(test_ctx); 1472 goto out; 1473 } 1474 err = damon_commit_ctx(kdamond->damon_ctx, param_ctx); 1475 out: 1476 damon_destroy_ctx(param_ctx); 1477 return err; 1478 } 1479 1480 static int damon_sysfs_commit_schemes_quota_goals(void *data) 1481 { 1482 struct damon_sysfs_kdamond *sysfs_kdamond = data; 1483 struct damon_ctx *ctx; 1484 struct damon_sysfs_context *sysfs_ctx; 1485 1486 if (!damon_sysfs_kdamond_running(sysfs_kdamond)) 1487 return -EINVAL; 1488 /* TODO: Support multiple contexts per kdamond */ 1489 if (sysfs_kdamond->contexts->nr != 1) 1490 return -EINVAL; 1491 1492 ctx = sysfs_kdamond->damon_ctx; 1493 sysfs_ctx = sysfs_kdamond->contexts->contexts_arr[0]; 1494 return damos_sysfs_set_quota_scores(sysfs_ctx->schemes, ctx); 1495 } 1496 1497 /* 1498 * damon_sysfs_upd_schemes_effective_quotas() - Update schemes effective quotas 1499 * sysfs files. 1500 * @data: The kobject wrapper that associated to the kdamond thread. 1501 * 1502 * This function reads the schemes' effective quotas of specific kdamond and 1503 * update the related values for sysfs files. This function should be called 1504 * from DAMON callbacks while holding ``damon_syfs_lock``, to safely access the 1505 * DAMON contexts-internal data and DAMON sysfs variables. 1506 */ 1507 static int damon_sysfs_upd_schemes_effective_quotas(void *data) 1508 { 1509 struct damon_sysfs_kdamond *kdamond = data; 1510 struct damon_ctx *ctx = kdamond->damon_ctx; 1511 1512 damos_sysfs_update_effective_quotas( 1513 kdamond->contexts->contexts_arr[0]->schemes, ctx); 1514 return 0; 1515 } 1516 1517 static int damon_sysfs_upd_tuned_intervals(void *data) 1518 { 1519 struct damon_sysfs_kdamond *kdamond = data; 1520 struct damon_ctx *ctx = kdamond->damon_ctx; 1521 1522 kdamond->contexts->contexts_arr[0]->attrs->intervals->sample_us = 1523 ctx->attrs.sample_interval; 1524 kdamond->contexts->contexts_arr[0]->attrs->intervals->aggr_us = 1525 ctx->attrs.aggr_interval; 1526 return 0; 1527 } 1528 1529 static struct damon_ctx *damon_sysfs_build_ctx( 1530 struct damon_sysfs_context *sys_ctx) 1531 { 1532 struct damon_ctx *ctx = damon_new_ctx(); 1533 int err; 1534 1535 if (!ctx) 1536 return ERR_PTR(-ENOMEM); 1537 1538 err = damon_sysfs_apply_inputs(ctx, sys_ctx); 1539 if (err) { 1540 damon_destroy_ctx(ctx); 1541 return ERR_PTR(err); 1542 } 1543 1544 return ctx; 1545 } 1546 1547 static int damon_sysfs_repeat_call_fn(void *data) 1548 { 1549 struct damon_sysfs_kdamond *sysfs_kdamond = data; 1550 static unsigned long next_update_jiffies; 1551 1552 if (!sysfs_kdamond->refresh_ms) 1553 return 0; 1554 if (time_before(jiffies, next_update_jiffies)) 1555 return 0; 1556 next_update_jiffies = jiffies + 1557 msecs_to_jiffies(sysfs_kdamond->refresh_ms); 1558 1559 if (!mutex_trylock(&damon_sysfs_lock)) 1560 return 0; 1561 damon_sysfs_upd_tuned_intervals(sysfs_kdamond); 1562 damon_sysfs_upd_schemes_stats(sysfs_kdamond); 1563 damon_sysfs_upd_schemes_effective_quotas(sysfs_kdamond); 1564 mutex_unlock(&damon_sysfs_lock); 1565 return 0; 1566 } 1567 1568 static struct damon_call_control damon_sysfs_repeat_call_control = { 1569 .fn = damon_sysfs_repeat_call_fn, 1570 .repeat = true, 1571 }; 1572 1573 static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond) 1574 { 1575 struct damon_ctx *ctx; 1576 int err; 1577 1578 if (damon_sysfs_kdamond_running(kdamond)) 1579 return -EBUSY; 1580 /* TODO: support multiple contexts per kdamond */ 1581 if (kdamond->contexts->nr != 1) 1582 return -EINVAL; 1583 1584 if (kdamond->damon_ctx) 1585 damon_destroy_ctx(kdamond->damon_ctx); 1586 kdamond->damon_ctx = NULL; 1587 1588 ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]); 1589 if (IS_ERR(ctx)) 1590 return PTR_ERR(ctx); 1591 err = damon_start(&ctx, 1, false); 1592 if (err) { 1593 damon_destroy_ctx(ctx); 1594 return err; 1595 } 1596 kdamond->damon_ctx = ctx; 1597 1598 damon_sysfs_repeat_call_control.data = kdamond; 1599 damon_call(ctx, &damon_sysfs_repeat_call_control); 1600 return err; 1601 } 1602 1603 static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond) 1604 { 1605 if (!kdamond->damon_ctx) 1606 return -EINVAL; 1607 return damon_stop(&kdamond->damon_ctx, 1); 1608 /* 1609 * To allow users show final monitoring results of already turned-off 1610 * DAMON, we free kdamond->damon_ctx in next 1611 * damon_sysfs_turn_damon_on(), or kdamonds_nr_store() 1612 */ 1613 } 1614 1615 static int damon_sysfs_damon_call(int (*fn)(void *data), 1616 struct damon_sysfs_kdamond *kdamond) 1617 { 1618 struct damon_call_control call_control = {}; 1619 1620 if (!kdamond->damon_ctx) 1621 return -EINVAL; 1622 call_control.fn = fn; 1623 call_control.data = kdamond; 1624 return damon_call(kdamond->damon_ctx, &call_control); 1625 } 1626 1627 struct damon_sysfs_schemes_walk_data { 1628 struct damon_sysfs_kdamond *sysfs_kdamond; 1629 bool total_bytes_only; 1630 }; 1631 1632 /* populate the region directory */ 1633 static void damon_sysfs_schemes_tried_regions_upd_one(void *data, struct damon_ctx *ctx, 1634 struct damon_target *t, struct damon_region *r, 1635 struct damos *s, unsigned long sz_filter_passed) 1636 { 1637 struct damon_sysfs_schemes_walk_data *walk_data = data; 1638 struct damon_sysfs_kdamond *sysfs_kdamond = walk_data->sysfs_kdamond; 1639 1640 damos_sysfs_populate_region_dir( 1641 sysfs_kdamond->contexts->contexts_arr[0]->schemes, 1642 ctx, t, r, s, walk_data->total_bytes_only, 1643 sz_filter_passed); 1644 } 1645 1646 static int damon_sysfs_update_schemes_tried_regions( 1647 struct damon_sysfs_kdamond *sysfs_kdamond, bool total_bytes_only) 1648 { 1649 struct damon_sysfs_schemes_walk_data walk_data = { 1650 .sysfs_kdamond = sysfs_kdamond, 1651 .total_bytes_only = total_bytes_only, 1652 }; 1653 struct damos_walk_control control = { 1654 .walk_fn = damon_sysfs_schemes_tried_regions_upd_one, 1655 .data = &walk_data, 1656 }; 1657 struct damon_ctx *ctx = sysfs_kdamond->damon_ctx; 1658 1659 if (!ctx) 1660 return -EINVAL; 1661 1662 damon_sysfs_schemes_clear_regions( 1663 sysfs_kdamond->contexts->contexts_arr[0]->schemes); 1664 return damos_walk(ctx, &control); 1665 } 1666 1667 /* 1668 * damon_sysfs_handle_cmd() - Handle a command for a specific kdamond. 1669 * @cmd: The command to handle. 1670 * @kdamond: The kobject wrapper for the associated kdamond. 1671 * 1672 * This function handles a DAMON sysfs command for a kdamond. 1673 * 1674 * Return: 0 on success, negative error code otherwise. 1675 */ 1676 static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd, 1677 struct damon_sysfs_kdamond *kdamond) 1678 { 1679 switch (cmd) { 1680 case DAMON_SYSFS_CMD_ON: 1681 return damon_sysfs_turn_damon_on(kdamond); 1682 case DAMON_SYSFS_CMD_OFF: 1683 return damon_sysfs_turn_damon_off(kdamond); 1684 case DAMON_SYSFS_CMD_COMMIT: 1685 return damon_sysfs_damon_call( 1686 damon_sysfs_commit_input, kdamond); 1687 case DAMON_SYSFS_CMD_COMMIT_SCHEMES_QUOTA_GOALS: 1688 return damon_sysfs_damon_call( 1689 damon_sysfs_commit_schemes_quota_goals, 1690 kdamond); 1691 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS: 1692 return damon_sysfs_damon_call( 1693 damon_sysfs_upd_schemes_stats, kdamond); 1694 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_BYTES: 1695 return damon_sysfs_update_schemes_tried_regions(kdamond, true); 1696 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS: 1697 return damon_sysfs_update_schemes_tried_regions(kdamond, false); 1698 case DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS: 1699 return damon_sysfs_schemes_clear_regions( 1700 kdamond->contexts->contexts_arr[0]->schemes); 1701 case DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS: 1702 return damon_sysfs_damon_call( 1703 damon_sysfs_upd_schemes_effective_quotas, 1704 kdamond); 1705 case DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS: 1706 return damon_sysfs_damon_call( 1707 damon_sysfs_upd_tuned_intervals, kdamond); 1708 default: 1709 return -EINVAL; 1710 } 1711 } 1712 1713 static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, 1714 const char *buf, size_t count) 1715 { 1716 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1717 struct damon_sysfs_kdamond, kobj); 1718 enum damon_sysfs_cmd cmd; 1719 ssize_t ret = -EINVAL; 1720 1721 if (!mutex_trylock(&damon_sysfs_lock)) 1722 return -EBUSY; 1723 for (cmd = 0; cmd < NR_DAMON_SYSFS_CMDS; cmd++) { 1724 if (sysfs_streq(buf, damon_sysfs_cmd_strs[cmd])) { 1725 ret = damon_sysfs_handle_cmd(cmd, kdamond); 1726 break; 1727 } 1728 } 1729 mutex_unlock(&damon_sysfs_lock); 1730 if (!ret) 1731 ret = count; 1732 return ret; 1733 } 1734 1735 static ssize_t pid_show(struct kobject *kobj, 1736 struct kobj_attribute *attr, char *buf) 1737 { 1738 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1739 struct damon_sysfs_kdamond, kobj); 1740 struct damon_ctx *ctx; 1741 int pid = -1; 1742 1743 if (!mutex_trylock(&damon_sysfs_lock)) 1744 return -EBUSY; 1745 ctx = kdamond->damon_ctx; 1746 if (!ctx) 1747 goto out; 1748 1749 mutex_lock(&ctx->kdamond_lock); 1750 if (ctx->kdamond) 1751 pid = ctx->kdamond->pid; 1752 mutex_unlock(&ctx->kdamond_lock); 1753 out: 1754 mutex_unlock(&damon_sysfs_lock); 1755 return sysfs_emit(buf, "%d\n", pid); 1756 } 1757 1758 static ssize_t refresh_ms_show(struct kobject *kobj, 1759 struct kobj_attribute *attr, char *buf) 1760 { 1761 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1762 struct damon_sysfs_kdamond, kobj); 1763 1764 return sysfs_emit(buf, "%u\n", kdamond->refresh_ms); 1765 } 1766 1767 static ssize_t refresh_ms_store(struct kobject *kobj, 1768 struct kobj_attribute *attr, const char *buf, size_t count) 1769 { 1770 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1771 struct damon_sysfs_kdamond, kobj); 1772 unsigned int nr; 1773 int err = kstrtouint(buf, 0, &nr); 1774 1775 if (err) 1776 return err; 1777 1778 kdamond->refresh_ms = nr; 1779 return count; 1780 } 1781 1782 static void damon_sysfs_kdamond_release(struct kobject *kobj) 1783 { 1784 struct damon_sysfs_kdamond *kdamond = container_of(kobj, 1785 struct damon_sysfs_kdamond, kobj); 1786 1787 if (kdamond->damon_ctx) 1788 damon_destroy_ctx(kdamond->damon_ctx); 1789 kfree(kdamond); 1790 } 1791 1792 static struct kobj_attribute damon_sysfs_kdamond_state_attr = 1793 __ATTR_RW_MODE(state, 0600); 1794 1795 static struct kobj_attribute damon_sysfs_kdamond_pid_attr = 1796 __ATTR_RO_MODE(pid, 0400); 1797 1798 static struct kobj_attribute damon_sysfs_kdamond_refresh_ms_attr = 1799 __ATTR_RW_MODE(refresh_ms, 0600); 1800 1801 static struct attribute *damon_sysfs_kdamond_attrs[] = { 1802 &damon_sysfs_kdamond_state_attr.attr, 1803 &damon_sysfs_kdamond_pid_attr.attr, 1804 &damon_sysfs_kdamond_refresh_ms_attr.attr, 1805 NULL, 1806 }; 1807 ATTRIBUTE_GROUPS(damon_sysfs_kdamond); 1808 1809 static const struct kobj_type damon_sysfs_kdamond_ktype = { 1810 .release = damon_sysfs_kdamond_release, 1811 .sysfs_ops = &kobj_sysfs_ops, 1812 .default_groups = damon_sysfs_kdamond_groups, 1813 }; 1814 1815 /* 1816 * kdamonds directory 1817 */ 1818 1819 struct damon_sysfs_kdamonds { 1820 struct kobject kobj; 1821 struct damon_sysfs_kdamond **kdamonds_arr; 1822 int nr; 1823 }; 1824 1825 static struct damon_sysfs_kdamonds *damon_sysfs_kdamonds_alloc(void) 1826 { 1827 return kzalloc(sizeof(struct damon_sysfs_kdamonds), GFP_KERNEL); 1828 } 1829 1830 static void damon_sysfs_kdamonds_rm_dirs(struct damon_sysfs_kdamonds *kdamonds) 1831 { 1832 struct damon_sysfs_kdamond **kdamonds_arr = kdamonds->kdamonds_arr; 1833 int i; 1834 1835 for (i = 0; i < kdamonds->nr; i++) { 1836 damon_sysfs_kdamond_rm_dirs(kdamonds_arr[i]); 1837 kobject_put(&kdamonds_arr[i]->kobj); 1838 } 1839 kdamonds->nr = 0; 1840 kfree(kdamonds_arr); 1841 kdamonds->kdamonds_arr = NULL; 1842 } 1843 1844 static bool damon_sysfs_kdamonds_busy(struct damon_sysfs_kdamond **kdamonds, 1845 int nr_kdamonds) 1846 { 1847 int i; 1848 1849 for (i = 0; i < nr_kdamonds; i++) { 1850 if (damon_sysfs_kdamond_running(kdamonds[i])) 1851 return true; 1852 } 1853 1854 return false; 1855 } 1856 1857 static int damon_sysfs_kdamonds_add_dirs(struct damon_sysfs_kdamonds *kdamonds, 1858 int nr_kdamonds) 1859 { 1860 struct damon_sysfs_kdamond **kdamonds_arr, *kdamond; 1861 int err, i; 1862 1863 if (damon_sysfs_kdamonds_busy(kdamonds->kdamonds_arr, kdamonds->nr)) 1864 return -EBUSY; 1865 1866 damon_sysfs_kdamonds_rm_dirs(kdamonds); 1867 if (!nr_kdamonds) 1868 return 0; 1869 1870 kdamonds_arr = kmalloc_array(nr_kdamonds, sizeof(*kdamonds_arr), 1871 GFP_KERNEL | __GFP_NOWARN); 1872 if (!kdamonds_arr) 1873 return -ENOMEM; 1874 kdamonds->kdamonds_arr = kdamonds_arr; 1875 1876 for (i = 0; i < nr_kdamonds; i++) { 1877 kdamond = damon_sysfs_kdamond_alloc(); 1878 if (!kdamond) { 1879 damon_sysfs_kdamonds_rm_dirs(kdamonds); 1880 return -ENOMEM; 1881 } 1882 1883 err = kobject_init_and_add(&kdamond->kobj, 1884 &damon_sysfs_kdamond_ktype, &kdamonds->kobj, 1885 "%d", i); 1886 if (err) 1887 goto out; 1888 1889 err = damon_sysfs_kdamond_add_dirs(kdamond); 1890 if (err) 1891 goto out; 1892 1893 kdamonds_arr[i] = kdamond; 1894 kdamonds->nr++; 1895 } 1896 return 0; 1897 1898 out: 1899 damon_sysfs_kdamonds_rm_dirs(kdamonds); 1900 kobject_put(&kdamond->kobj); 1901 return err; 1902 } 1903 1904 static ssize_t nr_kdamonds_show(struct kobject *kobj, 1905 struct kobj_attribute *attr, char *buf) 1906 { 1907 struct damon_sysfs_kdamonds *kdamonds = container_of(kobj, 1908 struct damon_sysfs_kdamonds, kobj); 1909 1910 return sysfs_emit(buf, "%d\n", kdamonds->nr); 1911 } 1912 1913 static ssize_t nr_kdamonds_store(struct kobject *kobj, 1914 struct kobj_attribute *attr, const char *buf, size_t count) 1915 { 1916 struct damon_sysfs_kdamonds *kdamonds; 1917 int nr, err; 1918 1919 err = kstrtoint(buf, 0, &nr); 1920 if (err) 1921 return err; 1922 if (nr < 0) 1923 return -EINVAL; 1924 1925 kdamonds = container_of(kobj, struct damon_sysfs_kdamonds, kobj); 1926 1927 if (!mutex_trylock(&damon_sysfs_lock)) 1928 return -EBUSY; 1929 err = damon_sysfs_kdamonds_add_dirs(kdamonds, nr); 1930 mutex_unlock(&damon_sysfs_lock); 1931 if (err) 1932 return err; 1933 1934 return count; 1935 } 1936 1937 static void damon_sysfs_kdamonds_release(struct kobject *kobj) 1938 { 1939 kfree(container_of(kobj, struct damon_sysfs_kdamonds, kobj)); 1940 } 1941 1942 static struct kobj_attribute damon_sysfs_kdamonds_nr_attr = 1943 __ATTR_RW_MODE(nr_kdamonds, 0600); 1944 1945 static struct attribute *damon_sysfs_kdamonds_attrs[] = { 1946 &damon_sysfs_kdamonds_nr_attr.attr, 1947 NULL, 1948 }; 1949 ATTRIBUTE_GROUPS(damon_sysfs_kdamonds); 1950 1951 static const struct kobj_type damon_sysfs_kdamonds_ktype = { 1952 .release = damon_sysfs_kdamonds_release, 1953 .sysfs_ops = &kobj_sysfs_ops, 1954 .default_groups = damon_sysfs_kdamonds_groups, 1955 }; 1956 1957 /* 1958 * damon user interface directory 1959 */ 1960 1961 struct damon_sysfs_ui_dir { 1962 struct kobject kobj; 1963 struct damon_sysfs_kdamonds *kdamonds; 1964 }; 1965 1966 static struct damon_sysfs_ui_dir *damon_sysfs_ui_dir_alloc(void) 1967 { 1968 return kzalloc(sizeof(struct damon_sysfs_ui_dir), GFP_KERNEL); 1969 } 1970 1971 static int damon_sysfs_ui_dir_add_dirs(struct damon_sysfs_ui_dir *ui_dir) 1972 { 1973 struct damon_sysfs_kdamonds *kdamonds; 1974 int err; 1975 1976 kdamonds = damon_sysfs_kdamonds_alloc(); 1977 if (!kdamonds) 1978 return -ENOMEM; 1979 1980 err = kobject_init_and_add(&kdamonds->kobj, 1981 &damon_sysfs_kdamonds_ktype, &ui_dir->kobj, 1982 "kdamonds"); 1983 if (err) { 1984 kobject_put(&kdamonds->kobj); 1985 return err; 1986 } 1987 ui_dir->kdamonds = kdamonds; 1988 return err; 1989 } 1990 1991 static void damon_sysfs_ui_dir_release(struct kobject *kobj) 1992 { 1993 kfree(container_of(kobj, struct damon_sysfs_ui_dir, kobj)); 1994 } 1995 1996 static struct attribute *damon_sysfs_ui_dir_attrs[] = { 1997 NULL, 1998 }; 1999 ATTRIBUTE_GROUPS(damon_sysfs_ui_dir); 2000 2001 static const struct kobj_type damon_sysfs_ui_dir_ktype = { 2002 .release = damon_sysfs_ui_dir_release, 2003 .sysfs_ops = &kobj_sysfs_ops, 2004 .default_groups = damon_sysfs_ui_dir_groups, 2005 }; 2006 2007 static int __init damon_sysfs_init(void) 2008 { 2009 struct kobject *damon_sysfs_root; 2010 struct damon_sysfs_ui_dir *admin; 2011 int err; 2012 2013 damon_sysfs_root = kobject_create_and_add("damon", mm_kobj); 2014 if (!damon_sysfs_root) 2015 return -ENOMEM; 2016 2017 admin = damon_sysfs_ui_dir_alloc(); 2018 if (!admin) { 2019 kobject_put(damon_sysfs_root); 2020 return -ENOMEM; 2021 } 2022 err = kobject_init_and_add(&admin->kobj, &damon_sysfs_ui_dir_ktype, 2023 damon_sysfs_root, "admin"); 2024 if (err) 2025 goto out; 2026 err = damon_sysfs_ui_dir_add_dirs(admin); 2027 if (err) 2028 goto out; 2029 return 0; 2030 2031 out: 2032 kobject_put(&admin->kobj); 2033 kobject_put(damon_sysfs_root); 2034 return err; 2035 } 2036 subsys_initcall(damon_sysfs_init); 2037 2038 #include "tests/sysfs-kunit.h" 2039