SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 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/damon.h> |
| 9 | #include <linux/kobject.h> |
| 10 | #include <linux/pid.h> |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/slab.h> |
| 13 | |
| 14 | static DEFINE_MUTEX(damon_sysfs_lock); |
| 15 | |
| 16 | /* |
| 17 | * unsigned long range directory |
| 18 | */ |
| 19 | |
| 20 | struct damon_sysfs_ul_range { |
| 21 | struct kobject kobj; |
| 22 | unsigned long min; |
| 23 | unsigned long max; |
| 24 | }; |
| 25 | |
| 26 | static struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc( |
| 27 | unsigned long min, |
| 28 | unsigned long max) |
| 29 | { |
| 30 | struct damon_sysfs_ul_range *range = kmalloc(sizeof(*range), |
| 31 | GFP_KERNEL); |
| 32 | |
| 33 | if (!range) |
| 34 | return NULL; |
| 35 | range->kobj = (struct kobject){}; |
| 36 | range->min = min; |
| 37 | range->max = max; |
| 38 | |
| 39 | return range; |
| 40 | } |
| 41 | |
| 42 | static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 43 | char *buf) |
| 44 | { |
| 45 | struct damon_sysfs_ul_range *range = container_of(kobj, |
| 46 | struct damon_sysfs_ul_range, kobj); |
| 47 | |
| 48 | return sysfs_emit(buf, "%lu\n", range->min); |
| 49 | } |
| 50 | |
| 51 | static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 52 | const char *buf, size_t count) |
| 53 | { |
| 54 | struct damon_sysfs_ul_range *range = container_of(kobj, |
| 55 | struct damon_sysfs_ul_range, kobj); |
| 56 | unsigned long min; |
| 57 | int err; |
| 58 | |
| 59 | err = kstrtoul(buf, 0, &min); |
| 60 | if (err) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | range->min = min; |
| 64 | return count; |
| 65 | } |
| 66 | |
| 67 | static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 68 | char *buf) |
| 69 | { |
| 70 | struct damon_sysfs_ul_range *range = container_of(kobj, |
| 71 | struct damon_sysfs_ul_range, kobj); |
| 72 | |
| 73 | return sysfs_emit(buf, "%lu\n", range->max); |
| 74 | } |
| 75 | |
| 76 | static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 77 | const char *buf, size_t count) |
| 78 | { |
| 79 | struct damon_sysfs_ul_range *range = container_of(kobj, |
| 80 | struct damon_sysfs_ul_range, kobj); |
| 81 | unsigned long max; |
| 82 | int err; |
| 83 | |
| 84 | err = kstrtoul(buf, 0, &max); |
| 85 | if (err) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | range->max = max; |
| 89 | return count; |
| 90 | } |
| 91 | |
| 92 | static void damon_sysfs_ul_range_release(struct kobject *kobj) |
| 93 | { |
| 94 | kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj)); |
| 95 | } |
| 96 | |
| 97 | static struct kobj_attribute damon_sysfs_ul_range_min_attr = |
| 98 | __ATTR_RW_MODE(min, 0600); |
| 99 | |
| 100 | static struct kobj_attribute damon_sysfs_ul_range_max_attr = |
| 101 | __ATTR_RW_MODE(max, 0600); |
| 102 | |
| 103 | static struct attribute *damon_sysfs_ul_range_attrs[] = { |
| 104 | &damon_sysfs_ul_range_min_attr.attr, |
| 105 | &damon_sysfs_ul_range_max_attr.attr, |
| 106 | NULL, |
| 107 | }; |
| 108 | ATTRIBUTE_GROUPS(damon_sysfs_ul_range); |
| 109 | |
| 110 | static struct kobj_type damon_sysfs_ul_range_ktype = { |
| 111 | .release = damon_sysfs_ul_range_release, |
| 112 | .sysfs_ops = &kobj_sysfs_ops, |
| 113 | .default_groups = damon_sysfs_ul_range_groups, |
| 114 | }; |
| 115 | |
| 116 | /* |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 117 | * schemes/stats directory |
| 118 | */ |
| 119 | |
| 120 | struct damon_sysfs_stats { |
| 121 | struct kobject kobj; |
| 122 | unsigned long nr_tried; |
| 123 | unsigned long sz_tried; |
| 124 | unsigned long nr_applied; |
| 125 | unsigned long sz_applied; |
| 126 | unsigned long qt_exceeds; |
| 127 | }; |
| 128 | |
| 129 | static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) |
| 130 | { |
| 131 | return kzalloc(sizeof(struct damon_sysfs_stats), GFP_KERNEL); |
| 132 | } |
| 133 | |
| 134 | static ssize_t nr_tried_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 135 | char *buf) |
| 136 | { |
| 137 | struct damon_sysfs_stats *stats = container_of(kobj, |
| 138 | struct damon_sysfs_stats, kobj); |
| 139 | |
| 140 | return sysfs_emit(buf, "%lu\n", stats->nr_tried); |
| 141 | } |
| 142 | |
| 143 | static ssize_t sz_tried_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 144 | char *buf) |
| 145 | { |
| 146 | struct damon_sysfs_stats *stats = container_of(kobj, |
| 147 | struct damon_sysfs_stats, kobj); |
| 148 | |
| 149 | return sysfs_emit(buf, "%lu\n", stats->sz_tried); |
| 150 | } |
| 151 | |
| 152 | static ssize_t nr_applied_show(struct kobject *kobj, |
| 153 | struct kobj_attribute *attr, char *buf) |
| 154 | { |
| 155 | struct damon_sysfs_stats *stats = container_of(kobj, |
| 156 | struct damon_sysfs_stats, kobj); |
| 157 | |
| 158 | return sysfs_emit(buf, "%lu\n", stats->nr_applied); |
| 159 | } |
| 160 | |
| 161 | static ssize_t sz_applied_show(struct kobject *kobj, |
| 162 | struct kobj_attribute *attr, char *buf) |
| 163 | { |
| 164 | struct damon_sysfs_stats *stats = container_of(kobj, |
| 165 | struct damon_sysfs_stats, kobj); |
| 166 | |
| 167 | return sysfs_emit(buf, "%lu\n", stats->sz_applied); |
| 168 | } |
| 169 | |
| 170 | static ssize_t qt_exceeds_show(struct kobject *kobj, |
| 171 | struct kobj_attribute *attr, char *buf) |
| 172 | { |
| 173 | struct damon_sysfs_stats *stats = container_of(kobj, |
| 174 | struct damon_sysfs_stats, kobj); |
| 175 | |
| 176 | return sysfs_emit(buf, "%lu\n", stats->qt_exceeds); |
| 177 | } |
| 178 | |
| 179 | static void damon_sysfs_stats_release(struct kobject *kobj) |
| 180 | { |
| 181 | kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); |
| 182 | } |
| 183 | |
| 184 | static struct kobj_attribute damon_sysfs_stats_nr_tried_attr = |
| 185 | __ATTR_RO_MODE(nr_tried, 0400); |
| 186 | |
| 187 | static struct kobj_attribute damon_sysfs_stats_sz_tried_attr = |
| 188 | __ATTR_RO_MODE(sz_tried, 0400); |
| 189 | |
| 190 | static struct kobj_attribute damon_sysfs_stats_nr_applied_attr = |
| 191 | __ATTR_RO_MODE(nr_applied, 0400); |
| 192 | |
| 193 | static struct kobj_attribute damon_sysfs_stats_sz_applied_attr = |
| 194 | __ATTR_RO_MODE(sz_applied, 0400); |
| 195 | |
| 196 | static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr = |
| 197 | __ATTR_RO_MODE(qt_exceeds, 0400); |
| 198 | |
| 199 | static struct attribute *damon_sysfs_stats_attrs[] = { |
| 200 | &damon_sysfs_stats_nr_tried_attr.attr, |
| 201 | &damon_sysfs_stats_sz_tried_attr.attr, |
| 202 | &damon_sysfs_stats_nr_applied_attr.attr, |
| 203 | &damon_sysfs_stats_sz_applied_attr.attr, |
| 204 | &damon_sysfs_stats_qt_exceeds_attr.attr, |
| 205 | NULL, |
| 206 | }; |
| 207 | ATTRIBUTE_GROUPS(damon_sysfs_stats); |
| 208 | |
| 209 | static struct kobj_type damon_sysfs_stats_ktype = { |
| 210 | .release = damon_sysfs_stats_release, |
| 211 | .sysfs_ops = &kobj_sysfs_ops, |
| 212 | .default_groups = damon_sysfs_stats_groups, |
| 213 | }; |
| 214 | |
| 215 | /* |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 216 | * watermarks directory |
| 217 | */ |
| 218 | |
| 219 | struct damon_sysfs_watermarks { |
| 220 | struct kobject kobj; |
| 221 | enum damos_wmark_metric metric; |
| 222 | unsigned long interval_us; |
| 223 | unsigned long high; |
| 224 | unsigned long mid; |
| 225 | unsigned long low; |
| 226 | }; |
| 227 | |
| 228 | static struct damon_sysfs_watermarks *damon_sysfs_watermarks_alloc( |
| 229 | enum damos_wmark_metric metric, unsigned long interval_us, |
| 230 | unsigned long high, unsigned long mid, unsigned long low) |
| 231 | { |
| 232 | struct damon_sysfs_watermarks *watermarks = kmalloc( |
| 233 | sizeof(*watermarks), GFP_KERNEL); |
| 234 | |
| 235 | if (!watermarks) |
| 236 | return NULL; |
| 237 | watermarks->kobj = (struct kobject){}; |
| 238 | watermarks->metric = metric; |
| 239 | watermarks->interval_us = interval_us; |
| 240 | watermarks->high = high; |
| 241 | watermarks->mid = mid; |
| 242 | watermarks->low = low; |
| 243 | return watermarks; |
| 244 | } |
| 245 | |
| 246 | /* Should match with enum damos_wmark_metric */ |
| 247 | static const char * const damon_sysfs_wmark_metric_strs[] = { |
| 248 | "none", |
| 249 | "free_mem_rate", |
| 250 | }; |
| 251 | |
| 252 | static ssize_t metric_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 253 | char *buf) |
| 254 | { |
| 255 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 256 | struct damon_sysfs_watermarks, kobj); |
| 257 | |
| 258 | return sysfs_emit(buf, "%s\n", |
| 259 | damon_sysfs_wmark_metric_strs[watermarks->metric]); |
| 260 | } |
| 261 | |
| 262 | static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 263 | const char *buf, size_t count) |
| 264 | { |
| 265 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 266 | struct damon_sysfs_watermarks, kobj); |
| 267 | enum damos_wmark_metric metric; |
| 268 | |
| 269 | for (metric = 0; metric < NR_DAMOS_WMARK_METRICS; metric++) { |
| 270 | if (sysfs_streq(buf, damon_sysfs_wmark_metric_strs[metric])) { |
| 271 | watermarks->metric = metric; |
| 272 | return count; |
| 273 | } |
| 274 | } |
| 275 | return -EINVAL; |
| 276 | } |
| 277 | |
| 278 | static ssize_t interval_us_show(struct kobject *kobj, |
| 279 | struct kobj_attribute *attr, char *buf) |
| 280 | { |
| 281 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 282 | struct damon_sysfs_watermarks, kobj); |
| 283 | |
| 284 | return sysfs_emit(buf, "%lu\n", watermarks->interval_us); |
| 285 | } |
| 286 | |
| 287 | static ssize_t interval_us_store(struct kobject *kobj, |
| 288 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 289 | { |
| 290 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 291 | struct damon_sysfs_watermarks, kobj); |
| 292 | int err = kstrtoul(buf, 0, &watermarks->interval_us); |
| 293 | |
| 294 | if (err) |
| 295 | return -EINVAL; |
| 296 | return count; |
| 297 | } |
| 298 | |
| 299 | static ssize_t high_show(struct kobject *kobj, |
| 300 | struct kobj_attribute *attr, char *buf) |
| 301 | { |
| 302 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 303 | struct damon_sysfs_watermarks, kobj); |
| 304 | |
| 305 | return sysfs_emit(buf, "%lu\n", watermarks->high); |
| 306 | } |
| 307 | |
| 308 | static ssize_t high_store(struct kobject *kobj, |
| 309 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 310 | { |
| 311 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 312 | struct damon_sysfs_watermarks, kobj); |
| 313 | int err = kstrtoul(buf, 0, &watermarks->high); |
| 314 | |
| 315 | if (err) |
| 316 | return -EINVAL; |
| 317 | return count; |
| 318 | } |
| 319 | |
| 320 | static ssize_t mid_show(struct kobject *kobj, |
| 321 | struct kobj_attribute *attr, char *buf) |
| 322 | { |
| 323 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 324 | struct damon_sysfs_watermarks, kobj); |
| 325 | |
| 326 | return sysfs_emit(buf, "%lu\n", watermarks->mid); |
| 327 | } |
| 328 | |
| 329 | static ssize_t mid_store(struct kobject *kobj, |
| 330 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 331 | { |
| 332 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 333 | struct damon_sysfs_watermarks, kobj); |
| 334 | int err = kstrtoul(buf, 0, &watermarks->mid); |
| 335 | |
| 336 | if (err) |
| 337 | return -EINVAL; |
| 338 | return count; |
| 339 | } |
| 340 | |
| 341 | static ssize_t low_show(struct kobject *kobj, |
| 342 | struct kobj_attribute *attr, char *buf) |
| 343 | { |
| 344 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 345 | struct damon_sysfs_watermarks, kobj); |
| 346 | |
| 347 | return sysfs_emit(buf, "%lu\n", watermarks->low); |
| 348 | } |
| 349 | |
| 350 | static ssize_t low_store(struct kobject *kobj, |
| 351 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 352 | { |
| 353 | struct damon_sysfs_watermarks *watermarks = container_of(kobj, |
| 354 | struct damon_sysfs_watermarks, kobj); |
| 355 | int err = kstrtoul(buf, 0, &watermarks->low); |
| 356 | |
| 357 | if (err) |
| 358 | return -EINVAL; |
| 359 | return count; |
| 360 | } |
| 361 | |
| 362 | static void damon_sysfs_watermarks_release(struct kobject *kobj) |
| 363 | { |
| 364 | kfree(container_of(kobj, struct damon_sysfs_watermarks, kobj)); |
| 365 | } |
| 366 | |
| 367 | static struct kobj_attribute damon_sysfs_watermarks_metric_attr = |
| 368 | __ATTR_RW_MODE(metric, 0600); |
| 369 | |
| 370 | static struct kobj_attribute damon_sysfs_watermarks_interval_us_attr = |
| 371 | __ATTR_RW_MODE(interval_us, 0600); |
| 372 | |
| 373 | static struct kobj_attribute damon_sysfs_watermarks_high_attr = |
| 374 | __ATTR_RW_MODE(high, 0600); |
| 375 | |
| 376 | static struct kobj_attribute damon_sysfs_watermarks_mid_attr = |
| 377 | __ATTR_RW_MODE(mid, 0600); |
| 378 | |
| 379 | static struct kobj_attribute damon_sysfs_watermarks_low_attr = |
| 380 | __ATTR_RW_MODE(low, 0600); |
| 381 | |
| 382 | static struct attribute *damon_sysfs_watermarks_attrs[] = { |
| 383 | &damon_sysfs_watermarks_metric_attr.attr, |
| 384 | &damon_sysfs_watermarks_interval_us_attr.attr, |
| 385 | &damon_sysfs_watermarks_high_attr.attr, |
| 386 | &damon_sysfs_watermarks_mid_attr.attr, |
| 387 | &damon_sysfs_watermarks_low_attr.attr, |
| 388 | NULL, |
| 389 | }; |
| 390 | ATTRIBUTE_GROUPS(damon_sysfs_watermarks); |
| 391 | |
| 392 | static struct kobj_type damon_sysfs_watermarks_ktype = { |
| 393 | .release = damon_sysfs_watermarks_release, |
| 394 | .sysfs_ops = &kobj_sysfs_ops, |
| 395 | .default_groups = damon_sysfs_watermarks_groups, |
| 396 | }; |
| 397 | |
| 398 | /* |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 399 | * scheme/weights directory |
| 400 | */ |
| 401 | |
| 402 | struct damon_sysfs_weights { |
| 403 | struct kobject kobj; |
| 404 | unsigned int sz; |
| 405 | unsigned int nr_accesses; |
| 406 | unsigned int age; |
| 407 | }; |
| 408 | |
| 409 | static struct damon_sysfs_weights *damon_sysfs_weights_alloc(unsigned int sz, |
| 410 | unsigned int nr_accesses, unsigned int age) |
| 411 | { |
| 412 | struct damon_sysfs_weights *weights = kmalloc(sizeof(*weights), |
| 413 | GFP_KERNEL); |
| 414 | |
| 415 | if (!weights) |
| 416 | return NULL; |
| 417 | weights->kobj = (struct kobject){}; |
| 418 | weights->sz = sz; |
| 419 | weights->nr_accesses = nr_accesses; |
| 420 | weights->age = age; |
| 421 | return weights; |
| 422 | } |
| 423 | |
| 424 | static ssize_t sz_permil_show(struct kobject *kobj, |
| 425 | struct kobj_attribute *attr, char *buf) |
| 426 | { |
| 427 | struct damon_sysfs_weights *weights = container_of(kobj, |
| 428 | struct damon_sysfs_weights, kobj); |
| 429 | |
| 430 | return sysfs_emit(buf, "%u\n", weights->sz); |
| 431 | } |
| 432 | |
| 433 | static ssize_t sz_permil_store(struct kobject *kobj, |
| 434 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 435 | { |
| 436 | struct damon_sysfs_weights *weights = container_of(kobj, |
| 437 | struct damon_sysfs_weights, kobj); |
| 438 | int err = kstrtouint(buf, 0, &weights->sz); |
| 439 | |
| 440 | if (err) |
| 441 | return -EINVAL; |
| 442 | return count; |
| 443 | } |
| 444 | |
| 445 | static ssize_t nr_accesses_permil_show(struct kobject *kobj, |
| 446 | struct kobj_attribute *attr, char *buf) |
| 447 | { |
| 448 | struct damon_sysfs_weights *weights = container_of(kobj, |
| 449 | struct damon_sysfs_weights, kobj); |
| 450 | |
| 451 | return sysfs_emit(buf, "%u\n", weights->nr_accesses); |
| 452 | } |
| 453 | |
| 454 | static ssize_t nr_accesses_permil_store(struct kobject *kobj, |
| 455 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 456 | { |
| 457 | struct damon_sysfs_weights *weights = container_of(kobj, |
| 458 | struct damon_sysfs_weights, kobj); |
| 459 | int err = kstrtouint(buf, 0, &weights->nr_accesses); |
| 460 | |
| 461 | if (err) |
| 462 | return -EINVAL; |
| 463 | return count; |
| 464 | } |
| 465 | |
| 466 | static ssize_t age_permil_show(struct kobject *kobj, |
| 467 | struct kobj_attribute *attr, char *buf) |
| 468 | { |
| 469 | struct damon_sysfs_weights *weights = container_of(kobj, |
| 470 | struct damon_sysfs_weights, kobj); |
| 471 | |
| 472 | return sysfs_emit(buf, "%u\n", weights->age); |
| 473 | } |
| 474 | |
| 475 | static ssize_t age_permil_store(struct kobject *kobj, |
| 476 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 477 | { |
| 478 | struct damon_sysfs_weights *weights = container_of(kobj, |
| 479 | struct damon_sysfs_weights, kobj); |
| 480 | int err = kstrtouint(buf, 0, &weights->age); |
| 481 | |
| 482 | if (err) |
| 483 | return -EINVAL; |
| 484 | return count; |
| 485 | } |
| 486 | |
| 487 | static void damon_sysfs_weights_release(struct kobject *kobj) |
| 488 | { |
| 489 | kfree(container_of(kobj, struct damon_sysfs_weights, kobj)); |
| 490 | } |
| 491 | |
| 492 | static struct kobj_attribute damon_sysfs_weights_sz_attr = |
| 493 | __ATTR_RW_MODE(sz_permil, 0600); |
| 494 | |
| 495 | static struct kobj_attribute damon_sysfs_weights_nr_accesses_attr = |
| 496 | __ATTR_RW_MODE(nr_accesses_permil, 0600); |
| 497 | |
| 498 | static struct kobj_attribute damon_sysfs_weights_age_attr = |
| 499 | __ATTR_RW_MODE(age_permil, 0600); |
| 500 | |
| 501 | static struct attribute *damon_sysfs_weights_attrs[] = { |
| 502 | &damon_sysfs_weights_sz_attr.attr, |
| 503 | &damon_sysfs_weights_nr_accesses_attr.attr, |
| 504 | &damon_sysfs_weights_age_attr.attr, |
| 505 | NULL, |
| 506 | }; |
| 507 | ATTRIBUTE_GROUPS(damon_sysfs_weights); |
| 508 | |
| 509 | static struct kobj_type damon_sysfs_weights_ktype = { |
| 510 | .release = damon_sysfs_weights_release, |
| 511 | .sysfs_ops = &kobj_sysfs_ops, |
| 512 | .default_groups = damon_sysfs_weights_groups, |
| 513 | }; |
| 514 | |
| 515 | /* |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 516 | * quotas directory |
| 517 | */ |
| 518 | |
| 519 | struct damon_sysfs_quotas { |
| 520 | struct kobject kobj; |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 521 | struct damon_sysfs_weights *weights; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 522 | unsigned long ms; |
| 523 | unsigned long sz; |
| 524 | unsigned long reset_interval_ms; |
| 525 | }; |
| 526 | |
| 527 | static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) |
| 528 | { |
| 529 | return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL); |
| 530 | } |
| 531 | |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 532 | static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) |
| 533 | { |
| 534 | struct damon_sysfs_weights *weights; |
| 535 | int err; |
| 536 | |
| 537 | weights = damon_sysfs_weights_alloc(0, 0, 0); |
| 538 | if (!weights) |
| 539 | return -ENOMEM; |
| 540 | |
| 541 | err = kobject_init_and_add(&weights->kobj, &damon_sysfs_weights_ktype, |
| 542 | "as->kobj, "weights"); |
| 543 | if (err) |
| 544 | kobject_put(&weights->kobj); |
| 545 | else |
| 546 | quotas->weights = weights; |
| 547 | return err; |
| 548 | } |
| 549 | |
| 550 | static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas) |
| 551 | { |
| 552 | kobject_put("as->weights->kobj); |
| 553 | } |
| 554 | |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 555 | static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 556 | char *buf) |
| 557 | { |
| 558 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
| 559 | struct damon_sysfs_quotas, kobj); |
| 560 | |
| 561 | return sysfs_emit(buf, "%lu\n", quotas->ms); |
| 562 | } |
| 563 | |
| 564 | static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 565 | const char *buf, size_t count) |
| 566 | { |
| 567 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
| 568 | struct damon_sysfs_quotas, kobj); |
| 569 | int err = kstrtoul(buf, 0, "as->ms); |
| 570 | |
| 571 | if (err) |
| 572 | return -EINVAL; |
| 573 | return count; |
| 574 | } |
| 575 | |
| 576 | static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 577 | char *buf) |
| 578 | { |
| 579 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
| 580 | struct damon_sysfs_quotas, kobj); |
| 581 | |
| 582 | return sysfs_emit(buf, "%lu\n", quotas->sz); |
| 583 | } |
| 584 | |
| 585 | static ssize_t bytes_store(struct kobject *kobj, |
| 586 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 587 | { |
| 588 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
| 589 | struct damon_sysfs_quotas, kobj); |
| 590 | int err = kstrtoul(buf, 0, "as->sz); |
| 591 | |
| 592 | if (err) |
| 593 | return -EINVAL; |
| 594 | return count; |
| 595 | } |
| 596 | |
| 597 | static ssize_t reset_interval_ms_show(struct kobject *kobj, |
| 598 | struct kobj_attribute *attr, char *buf) |
| 599 | { |
| 600 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
| 601 | struct damon_sysfs_quotas, kobj); |
| 602 | |
| 603 | return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms); |
| 604 | } |
| 605 | |
| 606 | static ssize_t reset_interval_ms_store(struct kobject *kobj, |
| 607 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 608 | { |
| 609 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
| 610 | struct damon_sysfs_quotas, kobj); |
| 611 | int err = kstrtoul(buf, 0, "as->reset_interval_ms); |
| 612 | |
| 613 | if (err) |
| 614 | return -EINVAL; |
| 615 | return count; |
| 616 | } |
| 617 | |
| 618 | static void damon_sysfs_quotas_release(struct kobject *kobj) |
| 619 | { |
| 620 | kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); |
| 621 | } |
| 622 | |
| 623 | static struct kobj_attribute damon_sysfs_quotas_ms_attr = |
| 624 | __ATTR_RW_MODE(ms, 0600); |
| 625 | |
| 626 | static struct kobj_attribute damon_sysfs_quotas_sz_attr = |
| 627 | __ATTR_RW_MODE(bytes, 0600); |
| 628 | |
| 629 | static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr = |
| 630 | __ATTR_RW_MODE(reset_interval_ms, 0600); |
| 631 | |
| 632 | static struct attribute *damon_sysfs_quotas_attrs[] = { |
| 633 | &damon_sysfs_quotas_ms_attr.attr, |
| 634 | &damon_sysfs_quotas_sz_attr.attr, |
| 635 | &damon_sysfs_quotas_reset_interval_ms_attr.attr, |
| 636 | NULL, |
| 637 | }; |
| 638 | ATTRIBUTE_GROUPS(damon_sysfs_quotas); |
| 639 | |
| 640 | static struct kobj_type damon_sysfs_quotas_ktype = { |
| 641 | .release = damon_sysfs_quotas_release, |
| 642 | .sysfs_ops = &kobj_sysfs_ops, |
| 643 | .default_groups = damon_sysfs_quotas_groups, |
| 644 | }; |
| 645 | |
| 646 | /* |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 647 | * access_pattern directory |
| 648 | */ |
| 649 | |
| 650 | struct damon_sysfs_access_pattern { |
| 651 | struct kobject kobj; |
| 652 | struct damon_sysfs_ul_range *sz; |
| 653 | struct damon_sysfs_ul_range *nr_accesses; |
| 654 | struct damon_sysfs_ul_range *age; |
| 655 | }; |
| 656 | |
| 657 | static |
| 658 | struct damon_sysfs_access_pattern *damon_sysfs_access_pattern_alloc(void) |
| 659 | { |
| 660 | struct damon_sysfs_access_pattern *access_pattern = |
| 661 | kmalloc(sizeof(*access_pattern), GFP_KERNEL); |
| 662 | |
| 663 | if (!access_pattern) |
| 664 | return NULL; |
| 665 | access_pattern->kobj = (struct kobject){}; |
| 666 | return access_pattern; |
| 667 | } |
| 668 | |
| 669 | static int damon_sysfs_access_pattern_add_range_dir( |
| 670 | struct damon_sysfs_access_pattern *access_pattern, |
| 671 | struct damon_sysfs_ul_range **range_dir_ptr, |
| 672 | char *name) |
| 673 | { |
| 674 | struct damon_sysfs_ul_range *range = damon_sysfs_ul_range_alloc(0, 0); |
| 675 | int err; |
| 676 | |
| 677 | if (!range) |
| 678 | return -ENOMEM; |
| 679 | err = kobject_init_and_add(&range->kobj, &damon_sysfs_ul_range_ktype, |
| 680 | &access_pattern->kobj, name); |
| 681 | if (err) |
| 682 | kobject_put(&range->kobj); |
| 683 | else |
| 684 | *range_dir_ptr = range; |
| 685 | return err; |
| 686 | } |
| 687 | |
| 688 | static int damon_sysfs_access_pattern_add_dirs( |
| 689 | struct damon_sysfs_access_pattern *access_pattern) |
| 690 | { |
| 691 | int err; |
| 692 | |
| 693 | err = damon_sysfs_access_pattern_add_range_dir(access_pattern, |
| 694 | &access_pattern->sz, "sz"); |
| 695 | if (err) |
| 696 | goto put_sz_out; |
| 697 | |
| 698 | err = damon_sysfs_access_pattern_add_range_dir(access_pattern, |
| 699 | &access_pattern->nr_accesses, "nr_accesses"); |
| 700 | if (err) |
| 701 | goto put_nr_accesses_sz_out; |
| 702 | |
| 703 | err = damon_sysfs_access_pattern_add_range_dir(access_pattern, |
| 704 | &access_pattern->age, "age"); |
| 705 | if (err) |
| 706 | goto put_age_nr_accesses_sz_out; |
| 707 | return 0; |
| 708 | |
| 709 | put_age_nr_accesses_sz_out: |
| 710 | kobject_put(&access_pattern->age->kobj); |
| 711 | access_pattern->age = NULL; |
| 712 | put_nr_accesses_sz_out: |
| 713 | kobject_put(&access_pattern->nr_accesses->kobj); |
| 714 | access_pattern->nr_accesses = NULL; |
| 715 | put_sz_out: |
| 716 | kobject_put(&access_pattern->sz->kobj); |
| 717 | access_pattern->sz = NULL; |
| 718 | return err; |
| 719 | } |
| 720 | |
| 721 | static void damon_sysfs_access_pattern_rm_dirs( |
| 722 | struct damon_sysfs_access_pattern *access_pattern) |
| 723 | { |
| 724 | kobject_put(&access_pattern->sz->kobj); |
| 725 | kobject_put(&access_pattern->nr_accesses->kobj); |
| 726 | kobject_put(&access_pattern->age->kobj); |
| 727 | } |
| 728 | |
| 729 | static void damon_sysfs_access_pattern_release(struct kobject *kobj) |
| 730 | { |
| 731 | kfree(container_of(kobj, struct damon_sysfs_access_pattern, kobj)); |
| 732 | } |
| 733 | |
| 734 | static struct attribute *damon_sysfs_access_pattern_attrs[] = { |
| 735 | NULL, |
| 736 | }; |
| 737 | ATTRIBUTE_GROUPS(damon_sysfs_access_pattern); |
| 738 | |
| 739 | static struct kobj_type damon_sysfs_access_pattern_ktype = { |
| 740 | .release = damon_sysfs_access_pattern_release, |
| 741 | .sysfs_ops = &kobj_sysfs_ops, |
| 742 | .default_groups = damon_sysfs_access_pattern_groups, |
| 743 | }; |
| 744 | |
| 745 | /* |
| 746 | * scheme directory |
| 747 | */ |
| 748 | |
| 749 | struct damon_sysfs_scheme { |
| 750 | struct kobject kobj; |
| 751 | enum damos_action action; |
| 752 | struct damon_sysfs_access_pattern *access_pattern; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 753 | struct damon_sysfs_quotas *quotas; |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 754 | struct damon_sysfs_watermarks *watermarks; |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 755 | struct damon_sysfs_stats *stats; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 756 | }; |
| 757 | |
| 758 | /* This should match with enum damos_action */ |
| 759 | static const char * const damon_sysfs_damos_action_strs[] = { |
| 760 | "willneed", |
| 761 | "cold", |
| 762 | "pageout", |
| 763 | "hugepage", |
| 764 | "nohugepage", |
| 765 | "stat", |
| 766 | }; |
| 767 | |
| 768 | static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc( |
| 769 | enum damos_action action) |
| 770 | { |
| 771 | struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme), |
| 772 | GFP_KERNEL); |
| 773 | |
| 774 | if (!scheme) |
| 775 | return NULL; |
| 776 | scheme->kobj = (struct kobject){}; |
| 777 | scheme->action = action; |
| 778 | return scheme; |
| 779 | } |
| 780 | |
| 781 | static int damon_sysfs_scheme_set_access_pattern( |
| 782 | struct damon_sysfs_scheme *scheme) |
| 783 | { |
| 784 | struct damon_sysfs_access_pattern *access_pattern; |
| 785 | int err; |
| 786 | |
| 787 | access_pattern = damon_sysfs_access_pattern_alloc(); |
| 788 | if (!access_pattern) |
| 789 | return -ENOMEM; |
| 790 | err = kobject_init_and_add(&access_pattern->kobj, |
| 791 | &damon_sysfs_access_pattern_ktype, &scheme->kobj, |
| 792 | "access_pattern"); |
| 793 | if (err) |
| 794 | goto out; |
| 795 | err = damon_sysfs_access_pattern_add_dirs(access_pattern); |
| 796 | if (err) |
| 797 | goto out; |
| 798 | scheme->access_pattern = access_pattern; |
| 799 | return 0; |
| 800 | |
| 801 | out: |
| 802 | kobject_put(&access_pattern->kobj); |
| 803 | return err; |
| 804 | } |
| 805 | |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 806 | static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme) |
| 807 | { |
| 808 | struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc(); |
| 809 | int err; |
| 810 | |
| 811 | if (!quotas) |
| 812 | return -ENOMEM; |
| 813 | err = kobject_init_and_add("as->kobj, &damon_sysfs_quotas_ktype, |
| 814 | &scheme->kobj, "quotas"); |
| 815 | if (err) |
| 816 | goto out; |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 817 | err = damon_sysfs_quotas_add_dirs(quotas); |
| 818 | if (err) |
| 819 | goto out; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 820 | scheme->quotas = quotas; |
| 821 | return 0; |
| 822 | |
| 823 | out: |
| 824 | kobject_put("as->kobj); |
| 825 | return err; |
| 826 | } |
| 827 | |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 828 | static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme) |
| 829 | { |
| 830 | struct damon_sysfs_watermarks *watermarks = |
| 831 | damon_sysfs_watermarks_alloc(DAMOS_WMARK_NONE, 0, 0, 0, 0); |
| 832 | int err; |
| 833 | |
| 834 | if (!watermarks) |
| 835 | return -ENOMEM; |
| 836 | err = kobject_init_and_add(&watermarks->kobj, |
| 837 | &damon_sysfs_watermarks_ktype, &scheme->kobj, |
| 838 | "watermarks"); |
| 839 | if (err) |
| 840 | kobject_put(&watermarks->kobj); |
| 841 | else |
| 842 | scheme->watermarks = watermarks; |
| 843 | return err; |
| 844 | } |
| 845 | |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 846 | static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme) |
| 847 | { |
| 848 | struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc(); |
| 849 | int err; |
| 850 | |
| 851 | if (!stats) |
| 852 | return -ENOMEM; |
| 853 | err = kobject_init_and_add(&stats->kobj, &damon_sysfs_stats_ktype, |
| 854 | &scheme->kobj, "stats"); |
| 855 | if (err) |
| 856 | kobject_put(&stats->kobj); |
| 857 | else |
| 858 | scheme->stats = stats; |
| 859 | return err; |
| 860 | } |
| 861 | |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 862 | static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme) |
| 863 | { |
| 864 | int err; |
| 865 | |
| 866 | err = damon_sysfs_scheme_set_access_pattern(scheme); |
| 867 | if (err) |
| 868 | return err; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 869 | err = damon_sysfs_scheme_set_quotas(scheme); |
| 870 | if (err) |
| 871 | goto put_access_pattern_out; |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 872 | err = damon_sysfs_scheme_set_watermarks(scheme); |
| 873 | if (err) |
| 874 | goto put_quotas_access_pattern_out; |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 875 | err = damon_sysfs_scheme_set_stats(scheme); |
| 876 | if (err) |
| 877 | goto put_watermarks_quotas_access_pattern_out; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 878 | return 0; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 879 | |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 880 | put_watermarks_quotas_access_pattern_out: |
| 881 | kobject_put(&scheme->watermarks->kobj); |
| 882 | scheme->watermarks = NULL; |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 883 | put_quotas_access_pattern_out: |
| 884 | kobject_put(&scheme->quotas->kobj); |
| 885 | scheme->quotas = NULL; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 886 | put_access_pattern_out: |
| 887 | kobject_put(&scheme->access_pattern->kobj); |
| 888 | scheme->access_pattern = NULL; |
| 889 | return err; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme) |
| 893 | { |
| 894 | damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern); |
| 895 | kobject_put(&scheme->access_pattern->kobj); |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 896 | damon_sysfs_quotas_rm_dirs(scheme->quotas); |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 897 | kobject_put(&scheme->quotas->kobj); |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 898 | kobject_put(&scheme->watermarks->kobj); |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 899 | kobject_put(&scheme->stats->kobj); |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 900 | } |
| 901 | |
| 902 | static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 903 | char *buf) |
| 904 | { |
| 905 | struct damon_sysfs_scheme *scheme = container_of(kobj, |
| 906 | struct damon_sysfs_scheme, kobj); |
| 907 | |
| 908 | return sysfs_emit(buf, "%s\n", |
| 909 | damon_sysfs_damos_action_strs[scheme->action]); |
| 910 | } |
| 911 | |
| 912 | static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 913 | const char *buf, size_t count) |
| 914 | { |
| 915 | struct damon_sysfs_scheme *scheme = container_of(kobj, |
| 916 | struct damon_sysfs_scheme, kobj); |
| 917 | enum damos_action action; |
| 918 | |
| 919 | for (action = 0; action < NR_DAMOS_ACTIONS; action++) { |
| 920 | if (sysfs_streq(buf, damon_sysfs_damos_action_strs[action])) { |
| 921 | scheme->action = action; |
| 922 | return count; |
| 923 | } |
| 924 | } |
| 925 | return -EINVAL; |
| 926 | } |
| 927 | |
| 928 | static void damon_sysfs_scheme_release(struct kobject *kobj) |
| 929 | { |
| 930 | kfree(container_of(kobj, struct damon_sysfs_scheme, kobj)); |
| 931 | } |
| 932 | |
| 933 | static struct kobj_attribute damon_sysfs_scheme_action_attr = |
| 934 | __ATTR_RW_MODE(action, 0600); |
| 935 | |
| 936 | static struct attribute *damon_sysfs_scheme_attrs[] = { |
| 937 | &damon_sysfs_scheme_action_attr.attr, |
| 938 | NULL, |
| 939 | }; |
| 940 | ATTRIBUTE_GROUPS(damon_sysfs_scheme); |
| 941 | |
| 942 | static struct kobj_type damon_sysfs_scheme_ktype = { |
| 943 | .release = damon_sysfs_scheme_release, |
| 944 | .sysfs_ops = &kobj_sysfs_ops, |
| 945 | .default_groups = damon_sysfs_scheme_groups, |
| 946 | }; |
| 947 | |
| 948 | /* |
| 949 | * schemes directory |
| 950 | */ |
| 951 | |
| 952 | struct damon_sysfs_schemes { |
| 953 | struct kobject kobj; |
| 954 | struct damon_sysfs_scheme **schemes_arr; |
| 955 | int nr; |
| 956 | }; |
| 957 | |
| 958 | static struct damon_sysfs_schemes *damon_sysfs_schemes_alloc(void) |
| 959 | { |
| 960 | return kzalloc(sizeof(struct damon_sysfs_schemes), GFP_KERNEL); |
| 961 | } |
| 962 | |
| 963 | static void damon_sysfs_schemes_rm_dirs(struct damon_sysfs_schemes *schemes) |
| 964 | { |
| 965 | struct damon_sysfs_scheme **schemes_arr = schemes->schemes_arr; |
| 966 | int i; |
| 967 | |
| 968 | for (i = 0; i < schemes->nr; i++) { |
| 969 | damon_sysfs_scheme_rm_dirs(schemes_arr[i]); |
| 970 | kobject_put(&schemes_arr[i]->kobj); |
| 971 | } |
| 972 | schemes->nr = 0; |
| 973 | kfree(schemes_arr); |
| 974 | schemes->schemes_arr = NULL; |
| 975 | } |
| 976 | |
| 977 | static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes, |
| 978 | int nr_schemes) |
| 979 | { |
| 980 | struct damon_sysfs_scheme **schemes_arr, *scheme; |
| 981 | int err, i; |
| 982 | |
| 983 | damon_sysfs_schemes_rm_dirs(schemes); |
| 984 | if (!nr_schemes) |
| 985 | return 0; |
| 986 | |
| 987 | schemes_arr = kmalloc_array(nr_schemes, sizeof(*schemes_arr), |
| 988 | GFP_KERNEL | __GFP_NOWARN); |
| 989 | if (!schemes_arr) |
| 990 | return -ENOMEM; |
| 991 | schemes->schemes_arr = schemes_arr; |
| 992 | |
| 993 | for (i = 0; i < nr_schemes; i++) { |
| 994 | scheme = damon_sysfs_scheme_alloc(DAMOS_STAT); |
| 995 | if (!scheme) { |
| 996 | damon_sysfs_schemes_rm_dirs(schemes); |
| 997 | return -ENOMEM; |
| 998 | } |
| 999 | |
| 1000 | err = kobject_init_and_add(&scheme->kobj, |
| 1001 | &damon_sysfs_scheme_ktype, &schemes->kobj, |
| 1002 | "%d", i); |
| 1003 | if (err) |
| 1004 | goto out; |
| 1005 | err = damon_sysfs_scheme_add_dirs(scheme); |
| 1006 | if (err) |
| 1007 | goto out; |
| 1008 | |
| 1009 | schemes_arr[i] = scheme; |
| 1010 | schemes->nr++; |
| 1011 | } |
| 1012 | return 0; |
| 1013 | |
| 1014 | out: |
| 1015 | damon_sysfs_schemes_rm_dirs(schemes); |
| 1016 | kobject_put(&scheme->kobj); |
| 1017 | return err; |
| 1018 | } |
| 1019 | |
| 1020 | static ssize_t nr_schemes_show(struct kobject *kobj, |
| 1021 | struct kobj_attribute *attr, char *buf) |
| 1022 | { |
| 1023 | struct damon_sysfs_schemes *schemes = container_of(kobj, |
| 1024 | struct damon_sysfs_schemes, kobj); |
| 1025 | |
| 1026 | return sysfs_emit(buf, "%d\n", schemes->nr); |
| 1027 | } |
| 1028 | |
| 1029 | static ssize_t nr_schemes_store(struct kobject *kobj, |
| 1030 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1031 | { |
| 1032 | struct damon_sysfs_schemes *schemes = container_of(kobj, |
| 1033 | struct damon_sysfs_schemes, kobj); |
| 1034 | int nr, err = kstrtoint(buf, 0, &nr); |
| 1035 | |
| 1036 | if (err) |
| 1037 | return err; |
| 1038 | if (nr < 0) |
| 1039 | return -EINVAL; |
| 1040 | |
| 1041 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 1042 | return -EBUSY; |
| 1043 | err = damon_sysfs_schemes_add_dirs(schemes, nr); |
| 1044 | mutex_unlock(&damon_sysfs_lock); |
| 1045 | if (err) |
| 1046 | return err; |
| 1047 | return count; |
| 1048 | } |
| 1049 | |
| 1050 | static void damon_sysfs_schemes_release(struct kobject *kobj) |
| 1051 | { |
| 1052 | kfree(container_of(kobj, struct damon_sysfs_schemes, kobj)); |
| 1053 | } |
| 1054 | |
| 1055 | static struct kobj_attribute damon_sysfs_schemes_nr_attr = |
| 1056 | __ATTR_RW_MODE(nr_schemes, 0600); |
| 1057 | |
| 1058 | static struct attribute *damon_sysfs_schemes_attrs[] = { |
| 1059 | &damon_sysfs_schemes_nr_attr.attr, |
| 1060 | NULL, |
| 1061 | }; |
| 1062 | ATTRIBUTE_GROUPS(damon_sysfs_schemes); |
| 1063 | |
| 1064 | static struct kobj_type damon_sysfs_schemes_ktype = { |
| 1065 | .release = damon_sysfs_schemes_release, |
| 1066 | .sysfs_ops = &kobj_sysfs_ops, |
| 1067 | .default_groups = damon_sysfs_schemes_groups, |
| 1068 | }; |
| 1069 | |
| 1070 | /* |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 1071 | * init region directory |
| 1072 | */ |
| 1073 | |
| 1074 | struct damon_sysfs_region { |
| 1075 | struct kobject kobj; |
| 1076 | unsigned long start; |
| 1077 | unsigned long end; |
| 1078 | }; |
| 1079 | |
| 1080 | static struct damon_sysfs_region *damon_sysfs_region_alloc( |
| 1081 | unsigned long start, |
| 1082 | unsigned long end) |
| 1083 | { |
| 1084 | struct damon_sysfs_region *region = kmalloc(sizeof(*region), |
| 1085 | GFP_KERNEL); |
| 1086 | |
| 1087 | if (!region) |
| 1088 | return NULL; |
| 1089 | region->kobj = (struct kobject){}; |
| 1090 | region->start = start; |
| 1091 | region->end = end; |
| 1092 | return region; |
| 1093 | } |
| 1094 | |
| 1095 | static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 1096 | char *buf) |
| 1097 | { |
| 1098 | struct damon_sysfs_region *region = container_of(kobj, |
| 1099 | struct damon_sysfs_region, kobj); |
| 1100 | |
| 1101 | return sysfs_emit(buf, "%lu\n", region->start); |
| 1102 | } |
| 1103 | |
| 1104 | static ssize_t start_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 1105 | const char *buf, size_t count) |
| 1106 | { |
| 1107 | struct damon_sysfs_region *region = container_of(kobj, |
| 1108 | struct damon_sysfs_region, kobj); |
| 1109 | int err = kstrtoul(buf, 0, ®ion->start); |
| 1110 | |
| 1111 | if (err) |
| 1112 | return -EINVAL; |
| 1113 | return count; |
| 1114 | } |
| 1115 | |
| 1116 | static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 1117 | char *buf) |
| 1118 | { |
| 1119 | struct damon_sysfs_region *region = container_of(kobj, |
| 1120 | struct damon_sysfs_region, kobj); |
| 1121 | |
| 1122 | return sysfs_emit(buf, "%lu\n", region->end); |
| 1123 | } |
| 1124 | |
| 1125 | static ssize_t end_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 1126 | const char *buf, size_t count) |
| 1127 | { |
| 1128 | struct damon_sysfs_region *region = container_of(kobj, |
| 1129 | struct damon_sysfs_region, kobj); |
| 1130 | int err = kstrtoul(buf, 0, ®ion->end); |
| 1131 | |
| 1132 | if (err) |
| 1133 | return -EINVAL; |
| 1134 | return count; |
| 1135 | } |
| 1136 | |
| 1137 | static void damon_sysfs_region_release(struct kobject *kobj) |
| 1138 | { |
| 1139 | kfree(container_of(kobj, struct damon_sysfs_region, kobj)); |
| 1140 | } |
| 1141 | |
| 1142 | static struct kobj_attribute damon_sysfs_region_start_attr = |
| 1143 | __ATTR_RW_MODE(start, 0600); |
| 1144 | |
| 1145 | static struct kobj_attribute damon_sysfs_region_end_attr = |
| 1146 | __ATTR_RW_MODE(end, 0600); |
| 1147 | |
| 1148 | static struct attribute *damon_sysfs_region_attrs[] = { |
| 1149 | &damon_sysfs_region_start_attr.attr, |
| 1150 | &damon_sysfs_region_end_attr.attr, |
| 1151 | NULL, |
| 1152 | }; |
| 1153 | ATTRIBUTE_GROUPS(damon_sysfs_region); |
| 1154 | |
| 1155 | static struct kobj_type damon_sysfs_region_ktype = { |
| 1156 | .release = damon_sysfs_region_release, |
| 1157 | .sysfs_ops = &kobj_sysfs_ops, |
| 1158 | .default_groups = damon_sysfs_region_groups, |
| 1159 | }; |
| 1160 | |
| 1161 | /* |
| 1162 | * init_regions directory |
| 1163 | */ |
| 1164 | |
| 1165 | struct damon_sysfs_regions { |
| 1166 | struct kobject kobj; |
| 1167 | struct damon_sysfs_region **regions_arr; |
| 1168 | int nr; |
| 1169 | }; |
| 1170 | |
| 1171 | static struct damon_sysfs_regions *damon_sysfs_regions_alloc(void) |
| 1172 | { |
| 1173 | return kzalloc(sizeof(struct damon_sysfs_regions), GFP_KERNEL); |
| 1174 | } |
| 1175 | |
| 1176 | static void damon_sysfs_regions_rm_dirs(struct damon_sysfs_regions *regions) |
| 1177 | { |
| 1178 | struct damon_sysfs_region **regions_arr = regions->regions_arr; |
| 1179 | int i; |
| 1180 | |
| 1181 | for (i = 0; i < regions->nr; i++) |
| 1182 | kobject_put(®ions_arr[i]->kobj); |
| 1183 | regions->nr = 0; |
| 1184 | kfree(regions_arr); |
| 1185 | regions->regions_arr = NULL; |
| 1186 | } |
| 1187 | |
| 1188 | static int damon_sysfs_regions_add_dirs(struct damon_sysfs_regions *regions, |
| 1189 | int nr_regions) |
| 1190 | { |
| 1191 | struct damon_sysfs_region **regions_arr, *region; |
| 1192 | int err, i; |
| 1193 | |
| 1194 | damon_sysfs_regions_rm_dirs(regions); |
| 1195 | if (!nr_regions) |
| 1196 | return 0; |
| 1197 | |
| 1198 | regions_arr = kmalloc_array(nr_regions, sizeof(*regions_arr), |
| 1199 | GFP_KERNEL | __GFP_NOWARN); |
| 1200 | if (!regions_arr) |
| 1201 | return -ENOMEM; |
| 1202 | regions->regions_arr = regions_arr; |
| 1203 | |
| 1204 | for (i = 0; i < nr_regions; i++) { |
| 1205 | region = damon_sysfs_region_alloc(0, 0); |
| 1206 | if (!region) { |
| 1207 | damon_sysfs_regions_rm_dirs(regions); |
| 1208 | return -ENOMEM; |
| 1209 | } |
| 1210 | |
| 1211 | err = kobject_init_and_add(®ion->kobj, |
| 1212 | &damon_sysfs_region_ktype, ®ions->kobj, |
| 1213 | "%d", i); |
| 1214 | if (err) { |
| 1215 | kobject_put(®ion->kobj); |
| 1216 | damon_sysfs_regions_rm_dirs(regions); |
| 1217 | return err; |
| 1218 | } |
| 1219 | |
| 1220 | regions_arr[i] = region; |
| 1221 | regions->nr++; |
| 1222 | } |
| 1223 | return 0; |
| 1224 | } |
| 1225 | |
| 1226 | static ssize_t nr_regions_show(struct kobject *kobj, |
| 1227 | struct kobj_attribute *attr, char *buf) |
| 1228 | { |
| 1229 | struct damon_sysfs_regions *regions = container_of(kobj, |
| 1230 | struct damon_sysfs_regions, kobj); |
| 1231 | |
| 1232 | return sysfs_emit(buf, "%d\n", regions->nr); |
| 1233 | } |
| 1234 | |
| 1235 | static ssize_t nr_regions_store(struct kobject *kobj, |
| 1236 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1237 | { |
| 1238 | struct damon_sysfs_regions *regions = container_of(kobj, |
| 1239 | struct damon_sysfs_regions, kobj); |
| 1240 | int nr, err = kstrtoint(buf, 0, &nr); |
| 1241 | |
| 1242 | if (err) |
| 1243 | return err; |
| 1244 | if (nr < 0) |
| 1245 | return -EINVAL; |
| 1246 | |
| 1247 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 1248 | return -EBUSY; |
| 1249 | err = damon_sysfs_regions_add_dirs(regions, nr); |
| 1250 | mutex_unlock(&damon_sysfs_lock); |
| 1251 | if (err) |
| 1252 | return err; |
| 1253 | |
| 1254 | return count; |
| 1255 | } |
| 1256 | |
| 1257 | static void damon_sysfs_regions_release(struct kobject *kobj) |
| 1258 | { |
| 1259 | kfree(container_of(kobj, struct damon_sysfs_regions, kobj)); |
| 1260 | } |
| 1261 | |
| 1262 | static struct kobj_attribute damon_sysfs_regions_nr_attr = |
| 1263 | __ATTR_RW_MODE(nr_regions, 0600); |
| 1264 | |
| 1265 | static struct attribute *damon_sysfs_regions_attrs[] = { |
| 1266 | &damon_sysfs_regions_nr_attr.attr, |
| 1267 | NULL, |
| 1268 | }; |
| 1269 | ATTRIBUTE_GROUPS(damon_sysfs_regions); |
| 1270 | |
| 1271 | static struct kobj_type damon_sysfs_regions_ktype = { |
| 1272 | .release = damon_sysfs_regions_release, |
| 1273 | .sysfs_ops = &kobj_sysfs_ops, |
| 1274 | .default_groups = damon_sysfs_regions_groups, |
| 1275 | }; |
| 1276 | |
| 1277 | /* |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1278 | * target directory |
| 1279 | */ |
| 1280 | |
| 1281 | struct damon_sysfs_target { |
| 1282 | struct kobject kobj; |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 1283 | struct damon_sysfs_regions *regions; |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1284 | int pid; |
| 1285 | }; |
| 1286 | |
| 1287 | static struct damon_sysfs_target *damon_sysfs_target_alloc(void) |
| 1288 | { |
| 1289 | return kzalloc(sizeof(struct damon_sysfs_target), GFP_KERNEL); |
| 1290 | } |
| 1291 | |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 1292 | static int damon_sysfs_target_add_dirs(struct damon_sysfs_target *target) |
| 1293 | { |
| 1294 | struct damon_sysfs_regions *regions = damon_sysfs_regions_alloc(); |
| 1295 | int err; |
| 1296 | |
| 1297 | if (!regions) |
| 1298 | return -ENOMEM; |
| 1299 | |
| 1300 | err = kobject_init_and_add(®ions->kobj, &damon_sysfs_regions_ktype, |
| 1301 | &target->kobj, "regions"); |
| 1302 | if (err) |
| 1303 | kobject_put(®ions->kobj); |
| 1304 | else |
| 1305 | target->regions = regions; |
| 1306 | return err; |
| 1307 | } |
| 1308 | |
| 1309 | static void damon_sysfs_target_rm_dirs(struct damon_sysfs_target *target) |
| 1310 | { |
| 1311 | damon_sysfs_regions_rm_dirs(target->regions); |
| 1312 | kobject_put(&target->regions->kobj); |
| 1313 | } |
| 1314 | |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1315 | static ssize_t pid_target_show(struct kobject *kobj, |
| 1316 | struct kobj_attribute *attr, char *buf) |
| 1317 | { |
| 1318 | struct damon_sysfs_target *target = container_of(kobj, |
| 1319 | struct damon_sysfs_target, kobj); |
| 1320 | |
| 1321 | return sysfs_emit(buf, "%d\n", target->pid); |
| 1322 | } |
| 1323 | |
| 1324 | static ssize_t pid_target_store(struct kobject *kobj, |
| 1325 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1326 | { |
| 1327 | struct damon_sysfs_target *target = container_of(kobj, |
| 1328 | struct damon_sysfs_target, kobj); |
| 1329 | int err = kstrtoint(buf, 0, &target->pid); |
| 1330 | |
| 1331 | if (err) |
| 1332 | return -EINVAL; |
| 1333 | return count; |
| 1334 | } |
| 1335 | |
| 1336 | static void damon_sysfs_target_release(struct kobject *kobj) |
| 1337 | { |
| 1338 | kfree(container_of(kobj, struct damon_sysfs_target, kobj)); |
| 1339 | } |
| 1340 | |
| 1341 | static struct kobj_attribute damon_sysfs_target_pid_attr = |
| 1342 | __ATTR_RW_MODE(pid_target, 0600); |
| 1343 | |
| 1344 | static struct attribute *damon_sysfs_target_attrs[] = { |
| 1345 | &damon_sysfs_target_pid_attr.attr, |
| 1346 | NULL, |
| 1347 | }; |
| 1348 | ATTRIBUTE_GROUPS(damon_sysfs_target); |
| 1349 | |
| 1350 | static struct kobj_type damon_sysfs_target_ktype = { |
| 1351 | .release = damon_sysfs_target_release, |
| 1352 | .sysfs_ops = &kobj_sysfs_ops, |
| 1353 | .default_groups = damon_sysfs_target_groups, |
| 1354 | }; |
| 1355 | |
| 1356 | /* |
| 1357 | * targets directory |
| 1358 | */ |
| 1359 | |
| 1360 | struct damon_sysfs_targets { |
| 1361 | struct kobject kobj; |
| 1362 | struct damon_sysfs_target **targets_arr; |
| 1363 | int nr; |
| 1364 | }; |
| 1365 | |
| 1366 | static struct damon_sysfs_targets *damon_sysfs_targets_alloc(void) |
| 1367 | { |
| 1368 | return kzalloc(sizeof(struct damon_sysfs_targets), GFP_KERNEL); |
| 1369 | } |
| 1370 | |
| 1371 | static void damon_sysfs_targets_rm_dirs(struct damon_sysfs_targets *targets) |
| 1372 | { |
| 1373 | struct damon_sysfs_target **targets_arr = targets->targets_arr; |
| 1374 | int i; |
| 1375 | |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 1376 | for (i = 0; i < targets->nr; i++) { |
| 1377 | damon_sysfs_target_rm_dirs(targets_arr[i]); |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1378 | kobject_put(&targets_arr[i]->kobj); |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 1379 | } |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1380 | targets->nr = 0; |
| 1381 | kfree(targets_arr); |
| 1382 | targets->targets_arr = NULL; |
| 1383 | } |
| 1384 | |
| 1385 | static int damon_sysfs_targets_add_dirs(struct damon_sysfs_targets *targets, |
| 1386 | int nr_targets) |
| 1387 | { |
| 1388 | struct damon_sysfs_target **targets_arr, *target; |
| 1389 | int err, i; |
| 1390 | |
| 1391 | damon_sysfs_targets_rm_dirs(targets); |
| 1392 | if (!nr_targets) |
| 1393 | return 0; |
| 1394 | |
| 1395 | targets_arr = kmalloc_array(nr_targets, sizeof(*targets_arr), |
| 1396 | GFP_KERNEL | __GFP_NOWARN); |
| 1397 | if (!targets_arr) |
| 1398 | return -ENOMEM; |
| 1399 | targets->targets_arr = targets_arr; |
| 1400 | |
| 1401 | for (i = 0; i < nr_targets; i++) { |
| 1402 | target = damon_sysfs_target_alloc(); |
| 1403 | if (!target) { |
| 1404 | damon_sysfs_targets_rm_dirs(targets); |
| 1405 | return -ENOMEM; |
| 1406 | } |
| 1407 | |
| 1408 | err = kobject_init_and_add(&target->kobj, |
| 1409 | &damon_sysfs_target_ktype, &targets->kobj, |
| 1410 | "%d", i); |
| 1411 | if (err) |
| 1412 | goto out; |
| 1413 | |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 1414 | err = damon_sysfs_target_add_dirs(target); |
| 1415 | if (err) |
| 1416 | goto out; |
| 1417 | |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1418 | targets_arr[i] = target; |
| 1419 | targets->nr++; |
| 1420 | } |
| 1421 | return 0; |
| 1422 | |
| 1423 | out: |
| 1424 | damon_sysfs_targets_rm_dirs(targets); |
| 1425 | kobject_put(&target->kobj); |
| 1426 | return err; |
| 1427 | } |
| 1428 | |
| 1429 | static ssize_t nr_targets_show(struct kobject *kobj, |
| 1430 | struct kobj_attribute *attr, char *buf) |
| 1431 | { |
| 1432 | struct damon_sysfs_targets *targets = container_of(kobj, |
| 1433 | struct damon_sysfs_targets, kobj); |
| 1434 | |
| 1435 | return sysfs_emit(buf, "%d\n", targets->nr); |
| 1436 | } |
| 1437 | |
| 1438 | static ssize_t nr_targets_store(struct kobject *kobj, |
| 1439 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1440 | { |
| 1441 | struct damon_sysfs_targets *targets = container_of(kobj, |
| 1442 | struct damon_sysfs_targets, kobj); |
| 1443 | int nr, err = kstrtoint(buf, 0, &nr); |
| 1444 | |
| 1445 | if (err) |
| 1446 | return err; |
| 1447 | if (nr < 0) |
| 1448 | return -EINVAL; |
| 1449 | |
| 1450 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 1451 | return -EBUSY; |
| 1452 | err = damon_sysfs_targets_add_dirs(targets, nr); |
| 1453 | mutex_unlock(&damon_sysfs_lock); |
| 1454 | if (err) |
| 1455 | return err; |
| 1456 | |
| 1457 | return count; |
| 1458 | } |
| 1459 | |
| 1460 | static void damon_sysfs_targets_release(struct kobject *kobj) |
| 1461 | { |
| 1462 | kfree(container_of(kobj, struct damon_sysfs_targets, kobj)); |
| 1463 | } |
| 1464 | |
| 1465 | static struct kobj_attribute damon_sysfs_targets_nr_attr = |
| 1466 | __ATTR_RW_MODE(nr_targets, 0600); |
| 1467 | |
| 1468 | static struct attribute *damon_sysfs_targets_attrs[] = { |
| 1469 | &damon_sysfs_targets_nr_attr.attr, |
| 1470 | NULL, |
| 1471 | }; |
| 1472 | ATTRIBUTE_GROUPS(damon_sysfs_targets); |
| 1473 | |
| 1474 | static struct kobj_type damon_sysfs_targets_ktype = { |
| 1475 | .release = damon_sysfs_targets_release, |
| 1476 | .sysfs_ops = &kobj_sysfs_ops, |
| 1477 | .default_groups = damon_sysfs_targets_groups, |
| 1478 | }; |
| 1479 | |
| 1480 | /* |
| 1481 | * intervals directory |
| 1482 | */ |
| 1483 | |
| 1484 | struct damon_sysfs_intervals { |
| 1485 | struct kobject kobj; |
| 1486 | unsigned long sample_us; |
| 1487 | unsigned long aggr_us; |
| 1488 | unsigned long update_us; |
| 1489 | }; |
| 1490 | |
| 1491 | static struct damon_sysfs_intervals *damon_sysfs_intervals_alloc( |
| 1492 | unsigned long sample_us, unsigned long aggr_us, |
| 1493 | unsigned long update_us) |
| 1494 | { |
| 1495 | struct damon_sysfs_intervals *intervals = kmalloc(sizeof(*intervals), |
| 1496 | GFP_KERNEL); |
| 1497 | |
| 1498 | if (!intervals) |
| 1499 | return NULL; |
| 1500 | |
| 1501 | intervals->kobj = (struct kobject){}; |
| 1502 | intervals->sample_us = sample_us; |
| 1503 | intervals->aggr_us = aggr_us; |
| 1504 | intervals->update_us = update_us; |
| 1505 | return intervals; |
| 1506 | } |
| 1507 | |
| 1508 | static ssize_t sample_us_show(struct kobject *kobj, |
| 1509 | struct kobj_attribute *attr, char *buf) |
| 1510 | { |
| 1511 | struct damon_sysfs_intervals *intervals = container_of(kobj, |
| 1512 | struct damon_sysfs_intervals, kobj); |
| 1513 | |
| 1514 | return sysfs_emit(buf, "%lu\n", intervals->sample_us); |
| 1515 | } |
| 1516 | |
| 1517 | static ssize_t sample_us_store(struct kobject *kobj, |
| 1518 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1519 | { |
| 1520 | struct damon_sysfs_intervals *intervals = container_of(kobj, |
| 1521 | struct damon_sysfs_intervals, kobj); |
| 1522 | unsigned long us; |
| 1523 | int err = kstrtoul(buf, 0, &us); |
| 1524 | |
| 1525 | if (err) |
| 1526 | return -EINVAL; |
| 1527 | |
| 1528 | intervals->sample_us = us; |
| 1529 | return count; |
| 1530 | } |
| 1531 | |
| 1532 | static ssize_t aggr_us_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 1533 | char *buf) |
| 1534 | { |
| 1535 | struct damon_sysfs_intervals *intervals = container_of(kobj, |
| 1536 | struct damon_sysfs_intervals, kobj); |
| 1537 | |
| 1538 | return sysfs_emit(buf, "%lu\n", intervals->aggr_us); |
| 1539 | } |
| 1540 | |
| 1541 | static ssize_t aggr_us_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 1542 | const char *buf, size_t count) |
| 1543 | { |
| 1544 | struct damon_sysfs_intervals *intervals = container_of(kobj, |
| 1545 | struct damon_sysfs_intervals, kobj); |
| 1546 | unsigned long us; |
| 1547 | int err = kstrtoul(buf, 0, &us); |
| 1548 | |
| 1549 | if (err) |
| 1550 | return -EINVAL; |
| 1551 | |
| 1552 | intervals->aggr_us = us; |
| 1553 | return count; |
| 1554 | } |
| 1555 | |
| 1556 | static ssize_t update_us_show(struct kobject *kobj, |
| 1557 | struct kobj_attribute *attr, char *buf) |
| 1558 | { |
| 1559 | struct damon_sysfs_intervals *intervals = container_of(kobj, |
| 1560 | struct damon_sysfs_intervals, kobj); |
| 1561 | |
| 1562 | return sysfs_emit(buf, "%lu\n", intervals->update_us); |
| 1563 | } |
| 1564 | |
| 1565 | static ssize_t update_us_store(struct kobject *kobj, |
| 1566 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1567 | { |
| 1568 | struct damon_sysfs_intervals *intervals = container_of(kobj, |
| 1569 | struct damon_sysfs_intervals, kobj); |
| 1570 | unsigned long us; |
| 1571 | int err = kstrtoul(buf, 0, &us); |
| 1572 | |
| 1573 | if (err) |
| 1574 | return -EINVAL; |
| 1575 | |
| 1576 | intervals->update_us = us; |
| 1577 | return count; |
| 1578 | } |
| 1579 | |
| 1580 | static void damon_sysfs_intervals_release(struct kobject *kobj) |
| 1581 | { |
| 1582 | kfree(container_of(kobj, struct damon_sysfs_intervals, kobj)); |
| 1583 | } |
| 1584 | |
| 1585 | static struct kobj_attribute damon_sysfs_intervals_sample_us_attr = |
| 1586 | __ATTR_RW_MODE(sample_us, 0600); |
| 1587 | |
| 1588 | static struct kobj_attribute damon_sysfs_intervals_aggr_us_attr = |
| 1589 | __ATTR_RW_MODE(aggr_us, 0600); |
| 1590 | |
| 1591 | static struct kobj_attribute damon_sysfs_intervals_update_us_attr = |
| 1592 | __ATTR_RW_MODE(update_us, 0600); |
| 1593 | |
| 1594 | static struct attribute *damon_sysfs_intervals_attrs[] = { |
| 1595 | &damon_sysfs_intervals_sample_us_attr.attr, |
| 1596 | &damon_sysfs_intervals_aggr_us_attr.attr, |
| 1597 | &damon_sysfs_intervals_update_us_attr.attr, |
| 1598 | NULL, |
| 1599 | }; |
| 1600 | ATTRIBUTE_GROUPS(damon_sysfs_intervals); |
| 1601 | |
| 1602 | static struct kobj_type damon_sysfs_intervals_ktype = { |
| 1603 | .release = damon_sysfs_intervals_release, |
| 1604 | .sysfs_ops = &kobj_sysfs_ops, |
| 1605 | .default_groups = damon_sysfs_intervals_groups, |
| 1606 | }; |
| 1607 | |
| 1608 | /* |
| 1609 | * monitoring_attrs directory |
| 1610 | */ |
| 1611 | |
| 1612 | struct damon_sysfs_attrs { |
| 1613 | struct kobject kobj; |
| 1614 | struct damon_sysfs_intervals *intervals; |
| 1615 | struct damon_sysfs_ul_range *nr_regions_range; |
| 1616 | }; |
| 1617 | |
| 1618 | static struct damon_sysfs_attrs *damon_sysfs_attrs_alloc(void) |
| 1619 | { |
| 1620 | struct damon_sysfs_attrs *attrs = kmalloc(sizeof(*attrs), GFP_KERNEL); |
| 1621 | |
| 1622 | if (!attrs) |
| 1623 | return NULL; |
| 1624 | attrs->kobj = (struct kobject){}; |
| 1625 | return attrs; |
| 1626 | } |
| 1627 | |
| 1628 | static int damon_sysfs_attrs_add_dirs(struct damon_sysfs_attrs *attrs) |
| 1629 | { |
| 1630 | struct damon_sysfs_intervals *intervals; |
| 1631 | struct damon_sysfs_ul_range *nr_regions_range; |
| 1632 | int err; |
| 1633 | |
| 1634 | intervals = damon_sysfs_intervals_alloc(5000, 100000, 60000000); |
| 1635 | if (!intervals) |
| 1636 | return -ENOMEM; |
| 1637 | |
| 1638 | err = kobject_init_and_add(&intervals->kobj, |
| 1639 | &damon_sysfs_intervals_ktype, &attrs->kobj, |
| 1640 | "intervals"); |
| 1641 | if (err) |
| 1642 | goto put_intervals_out; |
| 1643 | attrs->intervals = intervals; |
| 1644 | |
| 1645 | nr_regions_range = damon_sysfs_ul_range_alloc(10, 1000); |
| 1646 | if (!nr_regions_range) { |
| 1647 | err = -ENOMEM; |
| 1648 | goto put_intervals_out; |
| 1649 | } |
| 1650 | |
| 1651 | err = kobject_init_and_add(&nr_regions_range->kobj, |
| 1652 | &damon_sysfs_ul_range_ktype, &attrs->kobj, |
| 1653 | "nr_regions"); |
| 1654 | if (err) |
| 1655 | goto put_nr_regions_intervals_out; |
| 1656 | attrs->nr_regions_range = nr_regions_range; |
| 1657 | return 0; |
| 1658 | |
| 1659 | put_nr_regions_intervals_out: |
| 1660 | kobject_put(&nr_regions_range->kobj); |
| 1661 | attrs->nr_regions_range = NULL; |
| 1662 | put_intervals_out: |
| 1663 | kobject_put(&intervals->kobj); |
| 1664 | attrs->intervals = NULL; |
| 1665 | return err; |
| 1666 | } |
| 1667 | |
| 1668 | static void damon_sysfs_attrs_rm_dirs(struct damon_sysfs_attrs *attrs) |
| 1669 | { |
| 1670 | kobject_put(&attrs->nr_regions_range->kobj); |
| 1671 | kobject_put(&attrs->intervals->kobj); |
| 1672 | } |
| 1673 | |
| 1674 | static void damon_sysfs_attrs_release(struct kobject *kobj) |
| 1675 | { |
| 1676 | kfree(container_of(kobj, struct damon_sysfs_attrs, kobj)); |
| 1677 | } |
| 1678 | |
| 1679 | static struct attribute *damon_sysfs_attrs_attrs[] = { |
| 1680 | NULL, |
| 1681 | }; |
| 1682 | ATTRIBUTE_GROUPS(damon_sysfs_attrs); |
| 1683 | |
| 1684 | static struct kobj_type damon_sysfs_attrs_ktype = { |
| 1685 | .release = damon_sysfs_attrs_release, |
| 1686 | .sysfs_ops = &kobj_sysfs_ops, |
| 1687 | .default_groups = damon_sysfs_attrs_groups, |
| 1688 | }; |
| 1689 | |
| 1690 | /* |
| 1691 | * context directory |
| 1692 | */ |
| 1693 | |
| 1694 | /* This should match with enum damon_ops_id */ |
| 1695 | static const char * const damon_sysfs_ops_strs[] = { |
| 1696 | "vaddr", |
| 1697 | "paddr", |
| 1698 | }; |
| 1699 | |
| 1700 | struct damon_sysfs_context { |
| 1701 | struct kobject kobj; |
| 1702 | enum damon_ops_id ops_id; |
| 1703 | struct damon_sysfs_attrs *attrs; |
| 1704 | struct damon_sysfs_targets *targets; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 1705 | struct damon_sysfs_schemes *schemes; |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1706 | }; |
| 1707 | |
| 1708 | static struct damon_sysfs_context *damon_sysfs_context_alloc( |
| 1709 | enum damon_ops_id ops_id) |
| 1710 | { |
| 1711 | struct damon_sysfs_context *context = kmalloc(sizeof(*context), |
| 1712 | GFP_KERNEL); |
| 1713 | |
| 1714 | if (!context) |
| 1715 | return NULL; |
| 1716 | context->kobj = (struct kobject){}; |
| 1717 | context->ops_id = ops_id; |
| 1718 | return context; |
| 1719 | } |
| 1720 | |
| 1721 | static int damon_sysfs_context_set_attrs(struct damon_sysfs_context *context) |
| 1722 | { |
| 1723 | struct damon_sysfs_attrs *attrs = damon_sysfs_attrs_alloc(); |
| 1724 | int err; |
| 1725 | |
| 1726 | if (!attrs) |
| 1727 | return -ENOMEM; |
| 1728 | err = kobject_init_and_add(&attrs->kobj, &damon_sysfs_attrs_ktype, |
| 1729 | &context->kobj, "monitoring_attrs"); |
| 1730 | if (err) |
| 1731 | goto out; |
| 1732 | err = damon_sysfs_attrs_add_dirs(attrs); |
| 1733 | if (err) |
| 1734 | goto out; |
| 1735 | context->attrs = attrs; |
| 1736 | return 0; |
| 1737 | |
| 1738 | out: |
| 1739 | kobject_put(&attrs->kobj); |
| 1740 | return err; |
| 1741 | } |
| 1742 | |
| 1743 | static int damon_sysfs_context_set_targets(struct damon_sysfs_context *context) |
| 1744 | { |
| 1745 | struct damon_sysfs_targets *targets = damon_sysfs_targets_alloc(); |
| 1746 | int err; |
| 1747 | |
| 1748 | if (!targets) |
| 1749 | return -ENOMEM; |
| 1750 | err = kobject_init_and_add(&targets->kobj, &damon_sysfs_targets_ktype, |
| 1751 | &context->kobj, "targets"); |
| 1752 | if (err) { |
| 1753 | kobject_put(&targets->kobj); |
| 1754 | return err; |
| 1755 | } |
| 1756 | context->targets = targets; |
| 1757 | return 0; |
| 1758 | } |
| 1759 | |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 1760 | static int damon_sysfs_context_set_schemes(struct damon_sysfs_context *context) |
| 1761 | { |
| 1762 | struct damon_sysfs_schemes *schemes = damon_sysfs_schemes_alloc(); |
| 1763 | int err; |
| 1764 | |
| 1765 | if (!schemes) |
| 1766 | return -ENOMEM; |
| 1767 | err = kobject_init_and_add(&schemes->kobj, &damon_sysfs_schemes_ktype, |
| 1768 | &context->kobj, "schemes"); |
| 1769 | if (err) { |
| 1770 | kobject_put(&schemes->kobj); |
| 1771 | return err; |
| 1772 | } |
| 1773 | context->schemes = schemes; |
| 1774 | return 0; |
| 1775 | } |
| 1776 | |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1777 | static int damon_sysfs_context_add_dirs(struct damon_sysfs_context *context) |
| 1778 | { |
| 1779 | int err; |
| 1780 | |
| 1781 | err = damon_sysfs_context_set_attrs(context); |
| 1782 | if (err) |
| 1783 | return err; |
| 1784 | |
| 1785 | err = damon_sysfs_context_set_targets(context); |
| 1786 | if (err) |
| 1787 | goto put_attrs_out; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 1788 | |
| 1789 | err = damon_sysfs_context_set_schemes(context); |
| 1790 | if (err) |
| 1791 | goto put_targets_attrs_out; |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1792 | return 0; |
| 1793 | |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 1794 | put_targets_attrs_out: |
| 1795 | kobject_put(&context->targets->kobj); |
| 1796 | context->targets = NULL; |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1797 | put_attrs_out: |
| 1798 | kobject_put(&context->attrs->kobj); |
| 1799 | context->attrs = NULL; |
| 1800 | return err; |
| 1801 | } |
| 1802 | |
| 1803 | static void damon_sysfs_context_rm_dirs(struct damon_sysfs_context *context) |
| 1804 | { |
| 1805 | damon_sysfs_attrs_rm_dirs(context->attrs); |
| 1806 | kobject_put(&context->attrs->kobj); |
| 1807 | damon_sysfs_targets_rm_dirs(context->targets); |
| 1808 | kobject_put(&context->targets->kobj); |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 1809 | damon_sysfs_schemes_rm_dirs(context->schemes); |
| 1810 | kobject_put(&context->schemes->kobj); |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1811 | } |
| 1812 | |
| 1813 | static ssize_t operations_show(struct kobject *kobj, |
| 1814 | struct kobj_attribute *attr, char *buf) |
| 1815 | { |
| 1816 | struct damon_sysfs_context *context = container_of(kobj, |
| 1817 | struct damon_sysfs_context, kobj); |
| 1818 | |
| 1819 | return sysfs_emit(buf, "%s\n", damon_sysfs_ops_strs[context->ops_id]); |
| 1820 | } |
| 1821 | |
| 1822 | static ssize_t operations_store(struct kobject *kobj, |
| 1823 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1824 | { |
| 1825 | struct damon_sysfs_context *context = container_of(kobj, |
| 1826 | struct damon_sysfs_context, kobj); |
| 1827 | enum damon_ops_id id; |
| 1828 | |
| 1829 | for (id = 0; id < NR_DAMON_OPS; id++) { |
| 1830 | if (sysfs_streq(buf, damon_sysfs_ops_strs[id])) { |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 1831 | context->ops_id = id; |
| 1832 | return count; |
| 1833 | } |
| 1834 | } |
| 1835 | return -EINVAL; |
| 1836 | } |
| 1837 | |
| 1838 | static void damon_sysfs_context_release(struct kobject *kobj) |
| 1839 | { |
| 1840 | kfree(container_of(kobj, struct damon_sysfs_context, kobj)); |
| 1841 | } |
| 1842 | |
| 1843 | static struct kobj_attribute damon_sysfs_context_operations_attr = |
| 1844 | __ATTR_RW_MODE(operations, 0600); |
| 1845 | |
| 1846 | static struct attribute *damon_sysfs_context_attrs[] = { |
| 1847 | &damon_sysfs_context_operations_attr.attr, |
| 1848 | NULL, |
| 1849 | }; |
| 1850 | ATTRIBUTE_GROUPS(damon_sysfs_context); |
| 1851 | |
| 1852 | static struct kobj_type damon_sysfs_context_ktype = { |
| 1853 | .release = damon_sysfs_context_release, |
| 1854 | .sysfs_ops = &kobj_sysfs_ops, |
| 1855 | .default_groups = damon_sysfs_context_groups, |
| 1856 | }; |
| 1857 | |
| 1858 | /* |
| 1859 | * contexts directory |
| 1860 | */ |
| 1861 | |
| 1862 | struct damon_sysfs_contexts { |
| 1863 | struct kobject kobj; |
| 1864 | struct damon_sysfs_context **contexts_arr; |
| 1865 | int nr; |
| 1866 | }; |
| 1867 | |
| 1868 | static struct damon_sysfs_contexts *damon_sysfs_contexts_alloc(void) |
| 1869 | { |
| 1870 | return kzalloc(sizeof(struct damon_sysfs_contexts), GFP_KERNEL); |
| 1871 | } |
| 1872 | |
| 1873 | static void damon_sysfs_contexts_rm_dirs(struct damon_sysfs_contexts *contexts) |
| 1874 | { |
| 1875 | struct damon_sysfs_context **contexts_arr = contexts->contexts_arr; |
| 1876 | int i; |
| 1877 | |
| 1878 | for (i = 0; i < contexts->nr; i++) { |
| 1879 | damon_sysfs_context_rm_dirs(contexts_arr[i]); |
| 1880 | kobject_put(&contexts_arr[i]->kobj); |
| 1881 | } |
| 1882 | contexts->nr = 0; |
| 1883 | kfree(contexts_arr); |
| 1884 | contexts->contexts_arr = NULL; |
| 1885 | } |
| 1886 | |
| 1887 | static int damon_sysfs_contexts_add_dirs(struct damon_sysfs_contexts *contexts, |
| 1888 | int nr_contexts) |
| 1889 | { |
| 1890 | struct damon_sysfs_context **contexts_arr, *context; |
| 1891 | int err, i; |
| 1892 | |
| 1893 | damon_sysfs_contexts_rm_dirs(contexts); |
| 1894 | if (!nr_contexts) |
| 1895 | return 0; |
| 1896 | |
| 1897 | contexts_arr = kmalloc_array(nr_contexts, sizeof(*contexts_arr), |
| 1898 | GFP_KERNEL | __GFP_NOWARN); |
| 1899 | if (!contexts_arr) |
| 1900 | return -ENOMEM; |
| 1901 | contexts->contexts_arr = contexts_arr; |
| 1902 | |
| 1903 | for (i = 0; i < nr_contexts; i++) { |
| 1904 | context = damon_sysfs_context_alloc(DAMON_OPS_VADDR); |
| 1905 | if (!context) { |
| 1906 | damon_sysfs_contexts_rm_dirs(contexts); |
| 1907 | return -ENOMEM; |
| 1908 | } |
| 1909 | |
| 1910 | err = kobject_init_and_add(&context->kobj, |
| 1911 | &damon_sysfs_context_ktype, &contexts->kobj, |
| 1912 | "%d", i); |
| 1913 | if (err) |
| 1914 | goto out; |
| 1915 | |
| 1916 | err = damon_sysfs_context_add_dirs(context); |
| 1917 | if (err) |
| 1918 | goto out; |
| 1919 | |
| 1920 | contexts_arr[i] = context; |
| 1921 | contexts->nr++; |
| 1922 | } |
| 1923 | return 0; |
| 1924 | |
| 1925 | out: |
| 1926 | damon_sysfs_contexts_rm_dirs(contexts); |
| 1927 | kobject_put(&context->kobj); |
| 1928 | return err; |
| 1929 | } |
| 1930 | |
| 1931 | static ssize_t nr_contexts_show(struct kobject *kobj, |
| 1932 | struct kobj_attribute *attr, char *buf) |
| 1933 | { |
| 1934 | struct damon_sysfs_contexts *contexts = container_of(kobj, |
| 1935 | struct damon_sysfs_contexts, kobj); |
| 1936 | |
| 1937 | return sysfs_emit(buf, "%d\n", contexts->nr); |
| 1938 | } |
| 1939 | |
| 1940 | static ssize_t nr_contexts_store(struct kobject *kobj, |
| 1941 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1942 | { |
| 1943 | struct damon_sysfs_contexts *contexts = container_of(kobj, |
| 1944 | struct damon_sysfs_contexts, kobj); |
| 1945 | int nr, err; |
| 1946 | |
| 1947 | err = kstrtoint(buf, 0, &nr); |
| 1948 | if (err) |
| 1949 | return err; |
| 1950 | /* TODO: support multiple contexts per kdamond */ |
| 1951 | if (nr < 0 || 1 < nr) |
| 1952 | return -EINVAL; |
| 1953 | |
| 1954 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 1955 | return -EBUSY; |
| 1956 | err = damon_sysfs_contexts_add_dirs(contexts, nr); |
| 1957 | mutex_unlock(&damon_sysfs_lock); |
| 1958 | if (err) |
| 1959 | return err; |
| 1960 | |
| 1961 | return count; |
| 1962 | } |
| 1963 | |
| 1964 | static void damon_sysfs_contexts_release(struct kobject *kobj) |
| 1965 | { |
| 1966 | kfree(container_of(kobj, struct damon_sysfs_contexts, kobj)); |
| 1967 | } |
| 1968 | |
| 1969 | static struct kobj_attribute damon_sysfs_contexts_nr_attr |
| 1970 | = __ATTR_RW_MODE(nr_contexts, 0600); |
| 1971 | |
| 1972 | static struct attribute *damon_sysfs_contexts_attrs[] = { |
| 1973 | &damon_sysfs_contexts_nr_attr.attr, |
| 1974 | NULL, |
| 1975 | }; |
| 1976 | ATTRIBUTE_GROUPS(damon_sysfs_contexts); |
| 1977 | |
| 1978 | static struct kobj_type damon_sysfs_contexts_ktype = { |
| 1979 | .release = damon_sysfs_contexts_release, |
| 1980 | .sysfs_ops = &kobj_sysfs_ops, |
| 1981 | .default_groups = damon_sysfs_contexts_groups, |
| 1982 | }; |
| 1983 | |
| 1984 | /* |
| 1985 | * kdamond directory |
| 1986 | */ |
| 1987 | |
| 1988 | struct damon_sysfs_kdamond { |
| 1989 | struct kobject kobj; |
| 1990 | struct damon_sysfs_contexts *contexts; |
| 1991 | struct damon_ctx *damon_ctx; |
| 1992 | }; |
| 1993 | |
| 1994 | static struct damon_sysfs_kdamond *damon_sysfs_kdamond_alloc(void) |
| 1995 | { |
| 1996 | return kzalloc(sizeof(struct damon_sysfs_kdamond), GFP_KERNEL); |
| 1997 | } |
| 1998 | |
| 1999 | static int damon_sysfs_kdamond_add_dirs(struct damon_sysfs_kdamond *kdamond) |
| 2000 | { |
| 2001 | struct damon_sysfs_contexts *contexts; |
| 2002 | int err; |
| 2003 | |
| 2004 | contexts = damon_sysfs_contexts_alloc(); |
| 2005 | if (!contexts) |
| 2006 | return -ENOMEM; |
| 2007 | |
| 2008 | err = kobject_init_and_add(&contexts->kobj, |
| 2009 | &damon_sysfs_contexts_ktype, &kdamond->kobj, |
| 2010 | "contexts"); |
| 2011 | if (err) { |
| 2012 | kobject_put(&contexts->kobj); |
| 2013 | return err; |
| 2014 | } |
| 2015 | kdamond->contexts = contexts; |
| 2016 | |
| 2017 | return err; |
| 2018 | } |
| 2019 | |
| 2020 | static void damon_sysfs_kdamond_rm_dirs(struct damon_sysfs_kdamond *kdamond) |
| 2021 | { |
| 2022 | damon_sysfs_contexts_rm_dirs(kdamond->contexts); |
| 2023 | kobject_put(&kdamond->contexts->kobj); |
| 2024 | } |
| 2025 | |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2026 | static bool damon_sysfs_ctx_running(struct damon_ctx *ctx) |
| 2027 | { |
| 2028 | bool running; |
| 2029 | |
| 2030 | mutex_lock(&ctx->kdamond_lock); |
| 2031 | running = ctx->kdamond != NULL; |
| 2032 | mutex_unlock(&ctx->kdamond_lock); |
| 2033 | return running; |
| 2034 | } |
| 2035 | |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 2036 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 2037 | char *buf) |
| 2038 | { |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2039 | struct damon_sysfs_kdamond *kdamond = container_of(kobj, |
| 2040 | struct damon_sysfs_kdamond, kobj); |
| 2041 | struct damon_ctx *ctx = kdamond->damon_ctx; |
| 2042 | bool running; |
| 2043 | |
| 2044 | if (!ctx) |
| 2045 | running = false; |
| 2046 | else |
| 2047 | running = damon_sysfs_ctx_running(ctx); |
| 2048 | |
| 2049 | return sysfs_emit(buf, "%s\n", running ? "on" : "off"); |
| 2050 | } |
| 2051 | |
| 2052 | static int damon_sysfs_set_attrs(struct damon_ctx *ctx, |
| 2053 | struct damon_sysfs_attrs *sys_attrs) |
| 2054 | { |
| 2055 | struct damon_sysfs_intervals *sys_intervals = sys_attrs->intervals; |
| 2056 | struct damon_sysfs_ul_range *sys_nr_regions = |
| 2057 | sys_attrs->nr_regions_range; |
| 2058 | |
| 2059 | return damon_set_attrs(ctx, sys_intervals->sample_us, |
| 2060 | sys_intervals->aggr_us, sys_intervals->update_us, |
| 2061 | sys_nr_regions->min, sys_nr_regions->max); |
| 2062 | } |
| 2063 | |
| 2064 | static void damon_sysfs_destroy_targets(struct damon_ctx *ctx) |
| 2065 | { |
| 2066 | struct damon_target *t, *next; |
| 2067 | |
| 2068 | damon_for_each_target_safe(t, next, ctx) { |
| 2069 | if (ctx->ops.id == DAMON_OPS_VADDR) |
| 2070 | put_pid(t->pid); |
| 2071 | damon_destroy_target(t); |
| 2072 | } |
| 2073 | } |
| 2074 | |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 2075 | static int damon_sysfs_set_regions(struct damon_target *t, |
| 2076 | struct damon_sysfs_regions *sysfs_regions) |
| 2077 | { |
| 2078 | int i; |
| 2079 | |
| 2080 | for (i = 0; i < sysfs_regions->nr; i++) { |
| 2081 | struct damon_sysfs_region *sys_region = |
| 2082 | sysfs_regions->regions_arr[i]; |
| 2083 | struct damon_region *prev, *r; |
| 2084 | |
| 2085 | if (sys_region->start > sys_region->end) |
| 2086 | return -EINVAL; |
| 2087 | r = damon_new_region(sys_region->start, sys_region->end); |
| 2088 | if (!r) |
| 2089 | return -ENOMEM; |
| 2090 | damon_add_region(r, t); |
| 2091 | if (damon_nr_regions(t) > 1) { |
| 2092 | prev = damon_prev_region(r); |
| 2093 | if (prev->ar.end > r->ar.start) { |
| 2094 | damon_destroy_region(r, t); |
| 2095 | return -EINVAL; |
| 2096 | } |
| 2097 | } |
| 2098 | } |
| 2099 | return 0; |
| 2100 | } |
| 2101 | |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2102 | static int damon_sysfs_set_targets(struct damon_ctx *ctx, |
| 2103 | struct damon_sysfs_targets *sysfs_targets) |
| 2104 | { |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 2105 | int i, err; |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2106 | |
| 2107 | for (i = 0; i < sysfs_targets->nr; i++) { |
| 2108 | struct damon_sysfs_target *sys_target = |
| 2109 | sysfs_targets->targets_arr[i]; |
| 2110 | struct damon_target *t = damon_new_target(); |
| 2111 | |
| 2112 | if (!t) { |
| 2113 | damon_sysfs_destroy_targets(ctx); |
| 2114 | return -ENOMEM; |
| 2115 | } |
| 2116 | if (ctx->ops.id == DAMON_OPS_VADDR) { |
| 2117 | t->pid = find_get_pid(sys_target->pid); |
| 2118 | if (!t->pid) { |
| 2119 | damon_sysfs_destroy_targets(ctx); |
| 2120 | return -EINVAL; |
| 2121 | } |
| 2122 | } |
| 2123 | damon_add_target(ctx, t); |
SeongJae Park | 2031b14 | 2022-03-22 14:49:34 -0700 | [diff] [blame] | 2124 | err = damon_sysfs_set_regions(t, sys_target->regions); |
| 2125 | if (err) { |
| 2126 | damon_sysfs_destroy_targets(ctx); |
| 2127 | return err; |
| 2128 | } |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2129 | } |
| 2130 | return 0; |
| 2131 | } |
| 2132 | |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 2133 | static struct damos *damon_sysfs_mk_scheme( |
| 2134 | struct damon_sysfs_scheme *sysfs_scheme) |
| 2135 | { |
| 2136 | struct damon_sysfs_access_pattern *pattern = |
| 2137 | sysfs_scheme->access_pattern; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 2138 | struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 2139 | struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 2140 | struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 2141 | struct damos_quota quota = { |
| 2142 | .ms = sysfs_quotas->ms, |
| 2143 | .sz = sysfs_quotas->sz, |
| 2144 | .reset_interval = sysfs_quotas->reset_interval_ms, |
SeongJae Park | 1c78b2b | 2022-03-22 14:49:43 -0700 | [diff] [blame] | 2145 | .weight_sz = sysfs_weights->sz, |
| 2146 | .weight_nr_accesses = sysfs_weights->nr_accesses, |
| 2147 | .weight_age = sysfs_weights->age, |
SeongJae Park | 9bbb820 | 2022-03-22 14:49:40 -0700 | [diff] [blame] | 2148 | }; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 2149 | struct damos_watermarks wmarks = { |
SeongJae Park | 1b32234 | 2022-03-22 14:49:46 -0700 | [diff] [blame] | 2150 | .metric = sysfs_wmarks->metric, |
| 2151 | .interval = sysfs_wmarks->interval_us, |
| 2152 | .high = sysfs_wmarks->high, |
| 2153 | .mid = sysfs_wmarks->mid, |
| 2154 | .low = sysfs_wmarks->low, |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 2155 | }; |
| 2156 | |
| 2157 | return damon_new_scheme(pattern->sz->min, pattern->sz->max, |
| 2158 | pattern->nr_accesses->min, pattern->nr_accesses->max, |
| 2159 | pattern->age->min, pattern->age->max, |
| 2160 | sysfs_scheme->action, "a, &wmarks); |
| 2161 | } |
| 2162 | |
| 2163 | static int damon_sysfs_set_schemes(struct damon_ctx *ctx, |
| 2164 | struct damon_sysfs_schemes *sysfs_schemes) |
| 2165 | { |
| 2166 | int i; |
| 2167 | |
| 2168 | for (i = 0; i < sysfs_schemes->nr; i++) { |
| 2169 | struct damos *scheme, *next; |
| 2170 | |
| 2171 | scheme = damon_sysfs_mk_scheme(sysfs_schemes->schemes_arr[i]); |
| 2172 | if (!scheme) { |
| 2173 | damon_for_each_scheme_safe(scheme, next, ctx) |
| 2174 | damon_destroy_scheme(scheme); |
| 2175 | return -ENOMEM; |
| 2176 | } |
| 2177 | damon_add_scheme(ctx, scheme); |
| 2178 | } |
| 2179 | return 0; |
| 2180 | } |
| 2181 | |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2182 | static void damon_sysfs_before_terminate(struct damon_ctx *ctx) |
| 2183 | { |
| 2184 | struct damon_target *t, *next; |
| 2185 | |
| 2186 | if (ctx->ops.id != DAMON_OPS_VADDR) |
| 2187 | return; |
| 2188 | |
| 2189 | mutex_lock(&ctx->kdamond_lock); |
| 2190 | damon_for_each_target_safe(t, next, ctx) { |
| 2191 | put_pid(t->pid); |
| 2192 | damon_destroy_target(t); |
| 2193 | } |
| 2194 | mutex_unlock(&ctx->kdamond_lock); |
| 2195 | } |
| 2196 | |
| 2197 | static struct damon_ctx *damon_sysfs_build_ctx( |
| 2198 | struct damon_sysfs_context *sys_ctx) |
| 2199 | { |
| 2200 | struct damon_ctx *ctx = damon_new_ctx(); |
| 2201 | int err; |
| 2202 | |
| 2203 | if (!ctx) |
| 2204 | return ERR_PTR(-ENOMEM); |
| 2205 | |
| 2206 | err = damon_select_ops(ctx, sys_ctx->ops_id); |
| 2207 | if (err) |
| 2208 | goto out; |
| 2209 | err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs); |
| 2210 | if (err) |
| 2211 | goto out; |
| 2212 | err = damon_sysfs_set_targets(ctx, sys_ctx->targets); |
| 2213 | if (err) |
| 2214 | goto out; |
SeongJae Park | 7e84b1f | 2022-03-22 14:49:37 -0700 | [diff] [blame] | 2215 | err = damon_sysfs_set_schemes(ctx, sys_ctx->schemes); |
| 2216 | if (err) |
| 2217 | goto out; |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2218 | |
| 2219 | ctx->callback.before_terminate = damon_sysfs_before_terminate; |
| 2220 | return ctx; |
| 2221 | |
| 2222 | out: |
| 2223 | damon_destroy_ctx(ctx); |
| 2224 | return ERR_PTR(err); |
| 2225 | } |
| 2226 | |
| 2227 | static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond) |
| 2228 | { |
| 2229 | struct damon_ctx *ctx; |
| 2230 | int err; |
| 2231 | |
| 2232 | if (kdamond->damon_ctx && |
| 2233 | damon_sysfs_ctx_running(kdamond->damon_ctx)) |
| 2234 | return -EBUSY; |
| 2235 | /* TODO: support multiple contexts per kdamond */ |
| 2236 | if (kdamond->contexts->nr != 1) |
| 2237 | return -EINVAL; |
| 2238 | |
| 2239 | if (kdamond->damon_ctx) |
| 2240 | damon_destroy_ctx(kdamond->damon_ctx); |
| 2241 | kdamond->damon_ctx = NULL; |
| 2242 | |
| 2243 | ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]); |
| 2244 | if (IS_ERR(ctx)) |
| 2245 | return PTR_ERR(ctx); |
| 2246 | err = damon_start(&ctx, 1, false); |
| 2247 | if (err) { |
| 2248 | damon_destroy_ctx(ctx); |
| 2249 | return err; |
| 2250 | } |
| 2251 | kdamond->damon_ctx = ctx; |
| 2252 | return err; |
| 2253 | } |
| 2254 | |
| 2255 | static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond) |
| 2256 | { |
| 2257 | if (!kdamond->damon_ctx) |
| 2258 | return -EINVAL; |
| 2259 | return damon_stop(&kdamond->damon_ctx, 1); |
| 2260 | /* |
| 2261 | * To allow users show final monitoring results of already turned-off |
| 2262 | * DAMON, we free kdamond->damon_ctx in next |
| 2263 | * damon_sysfs_turn_damon_on(), or kdamonds_nr_store() |
| 2264 | */ |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 2265 | } |
| 2266 | |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 2267 | static int damon_sysfs_update_schemes_stats(struct damon_sysfs_kdamond *kdamond) |
| 2268 | { |
| 2269 | struct damon_ctx *ctx = kdamond->damon_ctx; |
| 2270 | struct damos *scheme; |
| 2271 | int schemes_idx = 0; |
| 2272 | |
| 2273 | if (!ctx) |
| 2274 | return -EINVAL; |
| 2275 | mutex_lock(&ctx->kdamond_lock); |
| 2276 | damon_for_each_scheme(scheme, ctx) { |
| 2277 | struct damon_sysfs_schemes *sysfs_schemes; |
| 2278 | struct damon_sysfs_stats *sysfs_stats; |
| 2279 | |
| 2280 | sysfs_schemes = kdamond->contexts->contexts_arr[0]->schemes; |
| 2281 | sysfs_stats = sysfs_schemes->schemes_arr[schemes_idx++]->stats; |
| 2282 | sysfs_stats->nr_tried = scheme->stat.nr_tried; |
| 2283 | sysfs_stats->sz_tried = scheme->stat.sz_tried; |
| 2284 | sysfs_stats->nr_applied = scheme->stat.nr_applied; |
| 2285 | sysfs_stats->sz_applied = scheme->stat.sz_applied; |
| 2286 | sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds; |
| 2287 | } |
| 2288 | mutex_unlock(&ctx->kdamond_lock); |
| 2289 | return 0; |
| 2290 | } |
| 2291 | |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 2292 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 2293 | const char *buf, size_t count) |
| 2294 | { |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2295 | struct damon_sysfs_kdamond *kdamond = container_of(kobj, |
| 2296 | struct damon_sysfs_kdamond, kobj); |
| 2297 | ssize_t ret; |
| 2298 | |
| 2299 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 2300 | return -EBUSY; |
| 2301 | if (sysfs_streq(buf, "on")) |
| 2302 | ret = damon_sysfs_turn_damon_on(kdamond); |
| 2303 | else if (sysfs_streq(buf, "off")) |
| 2304 | ret = damon_sysfs_turn_damon_off(kdamond); |
SeongJae Park | 0ac32b8 | 2022-03-22 14:49:49 -0700 | [diff] [blame] | 2305 | else if (sysfs_streq(buf, "update_schemes_stats")) |
| 2306 | ret = damon_sysfs_update_schemes_stats(kdamond); |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2307 | else |
| 2308 | ret = -EINVAL; |
| 2309 | mutex_unlock(&damon_sysfs_lock); |
| 2310 | if (!ret) |
| 2311 | ret = count; |
| 2312 | return ret; |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 2313 | } |
| 2314 | |
| 2315 | static ssize_t pid_show(struct kobject *kobj, |
| 2316 | struct kobj_attribute *attr, char *buf) |
| 2317 | { |
SeongJae Park | a61ea56 | 2022-03-22 14:49:30 -0700 | [diff] [blame] | 2318 | struct damon_sysfs_kdamond *kdamond = container_of(kobj, |
| 2319 | struct damon_sysfs_kdamond, kobj); |
| 2320 | struct damon_ctx *ctx; |
| 2321 | int pid; |
| 2322 | |
| 2323 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 2324 | return -EBUSY; |
| 2325 | ctx = kdamond->damon_ctx; |
| 2326 | if (!ctx) { |
| 2327 | pid = -1; |
| 2328 | goto out; |
| 2329 | } |
| 2330 | mutex_lock(&ctx->kdamond_lock); |
| 2331 | if (!ctx->kdamond) |
| 2332 | pid = -1; |
| 2333 | else |
| 2334 | pid = ctx->kdamond->pid; |
| 2335 | mutex_unlock(&ctx->kdamond_lock); |
| 2336 | out: |
| 2337 | mutex_unlock(&damon_sysfs_lock); |
| 2338 | return sysfs_emit(buf, "%d\n", pid); |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 2339 | } |
| 2340 | |
| 2341 | static void damon_sysfs_kdamond_release(struct kobject *kobj) |
| 2342 | { |
| 2343 | struct damon_sysfs_kdamond *kdamond = container_of(kobj, |
| 2344 | struct damon_sysfs_kdamond, kobj); |
| 2345 | |
| 2346 | if (kdamond->damon_ctx) |
| 2347 | damon_destroy_ctx(kdamond->damon_ctx); |
Xin Hao | 15423a5 | 2022-03-22 14:50:00 -0700 | [diff] [blame] | 2348 | kfree(kdamond); |
SeongJae Park | c951cd3 | 2022-03-22 14:49:27 -0700 | [diff] [blame] | 2349 | } |
| 2350 | |
| 2351 | static struct kobj_attribute damon_sysfs_kdamond_state_attr = |
| 2352 | __ATTR_RW_MODE(state, 0600); |
| 2353 | |
| 2354 | static struct kobj_attribute damon_sysfs_kdamond_pid_attr = |
| 2355 | __ATTR_RO_MODE(pid, 0400); |
| 2356 | |
| 2357 | static struct attribute *damon_sysfs_kdamond_attrs[] = { |
| 2358 | &damon_sysfs_kdamond_state_attr.attr, |
| 2359 | &damon_sysfs_kdamond_pid_attr.attr, |
| 2360 | NULL, |
| 2361 | }; |
| 2362 | ATTRIBUTE_GROUPS(damon_sysfs_kdamond); |
| 2363 | |
| 2364 | static struct kobj_type damon_sysfs_kdamond_ktype = { |
| 2365 | .release = damon_sysfs_kdamond_release, |
| 2366 | .sysfs_ops = &kobj_sysfs_ops, |
| 2367 | .default_groups = damon_sysfs_kdamond_groups, |
| 2368 | }; |
| 2369 | |
| 2370 | /* |
| 2371 | * kdamonds directory |
| 2372 | */ |
| 2373 | |
| 2374 | struct damon_sysfs_kdamonds { |
| 2375 | struct kobject kobj; |
| 2376 | struct damon_sysfs_kdamond **kdamonds_arr; |
| 2377 | int nr; |
| 2378 | }; |
| 2379 | |
| 2380 | static struct damon_sysfs_kdamonds *damon_sysfs_kdamonds_alloc(void) |
| 2381 | { |
| 2382 | return kzalloc(sizeof(struct damon_sysfs_kdamonds), GFP_KERNEL); |
| 2383 | } |
| 2384 | |
| 2385 | static void damon_sysfs_kdamonds_rm_dirs(struct damon_sysfs_kdamonds *kdamonds) |
| 2386 | { |
| 2387 | struct damon_sysfs_kdamond **kdamonds_arr = kdamonds->kdamonds_arr; |
| 2388 | int i; |
| 2389 | |
| 2390 | for (i = 0; i < kdamonds->nr; i++) { |
| 2391 | damon_sysfs_kdamond_rm_dirs(kdamonds_arr[i]); |
| 2392 | kobject_put(&kdamonds_arr[i]->kobj); |
| 2393 | } |
| 2394 | kdamonds->nr = 0; |
| 2395 | kfree(kdamonds_arr); |
| 2396 | kdamonds->kdamonds_arr = NULL; |
| 2397 | } |
| 2398 | |
| 2399 | static int damon_sysfs_nr_running_ctxs(struct damon_sysfs_kdamond **kdamonds, |
| 2400 | int nr_kdamonds) |
| 2401 | { |
| 2402 | int nr_running_ctxs = 0; |
| 2403 | int i; |
| 2404 | |
| 2405 | for (i = 0; i < nr_kdamonds; i++) { |
| 2406 | struct damon_ctx *ctx = kdamonds[i]->damon_ctx; |
| 2407 | |
| 2408 | if (!ctx) |
| 2409 | continue; |
| 2410 | mutex_lock(&ctx->kdamond_lock); |
| 2411 | if (ctx->kdamond) |
| 2412 | nr_running_ctxs++; |
| 2413 | mutex_unlock(&ctx->kdamond_lock); |
| 2414 | } |
| 2415 | return nr_running_ctxs; |
| 2416 | } |
| 2417 | |
| 2418 | static int damon_sysfs_kdamonds_add_dirs(struct damon_sysfs_kdamonds *kdamonds, |
| 2419 | int nr_kdamonds) |
| 2420 | { |
| 2421 | struct damon_sysfs_kdamond **kdamonds_arr, *kdamond; |
| 2422 | int err, i; |
| 2423 | |
| 2424 | if (damon_sysfs_nr_running_ctxs(kdamonds->kdamonds_arr, kdamonds->nr)) |
| 2425 | return -EBUSY; |
| 2426 | |
| 2427 | damon_sysfs_kdamonds_rm_dirs(kdamonds); |
| 2428 | if (!nr_kdamonds) |
| 2429 | return 0; |
| 2430 | |
| 2431 | kdamonds_arr = kmalloc_array(nr_kdamonds, sizeof(*kdamonds_arr), |
| 2432 | GFP_KERNEL | __GFP_NOWARN); |
| 2433 | if (!kdamonds_arr) |
| 2434 | return -ENOMEM; |
| 2435 | kdamonds->kdamonds_arr = kdamonds_arr; |
| 2436 | |
| 2437 | for (i = 0; i < nr_kdamonds; i++) { |
| 2438 | kdamond = damon_sysfs_kdamond_alloc(); |
| 2439 | if (!kdamond) { |
| 2440 | damon_sysfs_kdamonds_rm_dirs(kdamonds); |
| 2441 | return -ENOMEM; |
| 2442 | } |
| 2443 | |
| 2444 | err = kobject_init_and_add(&kdamond->kobj, |
| 2445 | &damon_sysfs_kdamond_ktype, &kdamonds->kobj, |
| 2446 | "%d", i); |
| 2447 | if (err) |
| 2448 | goto out; |
| 2449 | |
| 2450 | err = damon_sysfs_kdamond_add_dirs(kdamond); |
| 2451 | if (err) |
| 2452 | goto out; |
| 2453 | |
| 2454 | kdamonds_arr[i] = kdamond; |
| 2455 | kdamonds->nr++; |
| 2456 | } |
| 2457 | return 0; |
| 2458 | |
| 2459 | out: |
| 2460 | damon_sysfs_kdamonds_rm_dirs(kdamonds); |
| 2461 | kobject_put(&kdamond->kobj); |
| 2462 | return err; |
| 2463 | } |
| 2464 | |
| 2465 | static ssize_t nr_kdamonds_show(struct kobject *kobj, |
| 2466 | struct kobj_attribute *attr, char *buf) |
| 2467 | { |
| 2468 | struct damon_sysfs_kdamonds *kdamonds = container_of(kobj, |
| 2469 | struct damon_sysfs_kdamonds, kobj); |
| 2470 | |
| 2471 | return sysfs_emit(buf, "%d\n", kdamonds->nr); |
| 2472 | } |
| 2473 | |
| 2474 | static ssize_t nr_kdamonds_store(struct kobject *kobj, |
| 2475 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 2476 | { |
| 2477 | struct damon_sysfs_kdamonds *kdamonds = container_of(kobj, |
| 2478 | struct damon_sysfs_kdamonds, kobj); |
| 2479 | int nr, err; |
| 2480 | |
| 2481 | err = kstrtoint(buf, 0, &nr); |
| 2482 | if (err) |
| 2483 | return err; |
| 2484 | if (nr < 0) |
| 2485 | return -EINVAL; |
| 2486 | |
| 2487 | if (!mutex_trylock(&damon_sysfs_lock)) |
| 2488 | return -EBUSY; |
| 2489 | err = damon_sysfs_kdamonds_add_dirs(kdamonds, nr); |
| 2490 | mutex_unlock(&damon_sysfs_lock); |
| 2491 | if (err) |
| 2492 | return err; |
| 2493 | |
| 2494 | return count; |
| 2495 | } |
| 2496 | |
| 2497 | static void damon_sysfs_kdamonds_release(struct kobject *kobj) |
| 2498 | { |
| 2499 | kfree(container_of(kobj, struct damon_sysfs_kdamonds, kobj)); |
| 2500 | } |
| 2501 | |
| 2502 | static struct kobj_attribute damon_sysfs_kdamonds_nr_attr = |
| 2503 | __ATTR_RW_MODE(nr_kdamonds, 0600); |
| 2504 | |
| 2505 | static struct attribute *damon_sysfs_kdamonds_attrs[] = { |
| 2506 | &damon_sysfs_kdamonds_nr_attr.attr, |
| 2507 | NULL, |
| 2508 | }; |
| 2509 | ATTRIBUTE_GROUPS(damon_sysfs_kdamonds); |
| 2510 | |
| 2511 | static struct kobj_type damon_sysfs_kdamonds_ktype = { |
| 2512 | .release = damon_sysfs_kdamonds_release, |
| 2513 | .sysfs_ops = &kobj_sysfs_ops, |
| 2514 | .default_groups = damon_sysfs_kdamonds_groups, |
| 2515 | }; |
| 2516 | |
| 2517 | /* |
| 2518 | * damon user interface directory |
| 2519 | */ |
| 2520 | |
| 2521 | struct damon_sysfs_ui_dir { |
| 2522 | struct kobject kobj; |
| 2523 | struct damon_sysfs_kdamonds *kdamonds; |
| 2524 | }; |
| 2525 | |
| 2526 | static struct damon_sysfs_ui_dir *damon_sysfs_ui_dir_alloc(void) |
| 2527 | { |
| 2528 | return kzalloc(sizeof(struct damon_sysfs_ui_dir), GFP_KERNEL); |
| 2529 | } |
| 2530 | |
| 2531 | static int damon_sysfs_ui_dir_add_dirs(struct damon_sysfs_ui_dir *ui_dir) |
| 2532 | { |
| 2533 | struct damon_sysfs_kdamonds *kdamonds; |
| 2534 | int err; |
| 2535 | |
| 2536 | kdamonds = damon_sysfs_kdamonds_alloc(); |
| 2537 | if (!kdamonds) |
| 2538 | return -ENOMEM; |
| 2539 | |
| 2540 | err = kobject_init_and_add(&kdamonds->kobj, |
| 2541 | &damon_sysfs_kdamonds_ktype, &ui_dir->kobj, |
| 2542 | "kdamonds"); |
| 2543 | if (err) { |
| 2544 | kobject_put(&kdamonds->kobj); |
| 2545 | return err; |
| 2546 | } |
| 2547 | ui_dir->kdamonds = kdamonds; |
| 2548 | return err; |
| 2549 | } |
| 2550 | |
| 2551 | static void damon_sysfs_ui_dir_release(struct kobject *kobj) |
| 2552 | { |
| 2553 | kfree(container_of(kobj, struct damon_sysfs_ui_dir, kobj)); |
| 2554 | } |
| 2555 | |
| 2556 | static struct attribute *damon_sysfs_ui_dir_attrs[] = { |
| 2557 | NULL, |
| 2558 | }; |
| 2559 | ATTRIBUTE_GROUPS(damon_sysfs_ui_dir); |
| 2560 | |
| 2561 | static struct kobj_type damon_sysfs_ui_dir_ktype = { |
| 2562 | .release = damon_sysfs_ui_dir_release, |
| 2563 | .sysfs_ops = &kobj_sysfs_ops, |
| 2564 | .default_groups = damon_sysfs_ui_dir_groups, |
| 2565 | }; |
| 2566 | |
| 2567 | static int __init damon_sysfs_init(void) |
| 2568 | { |
| 2569 | struct kobject *damon_sysfs_root; |
| 2570 | struct damon_sysfs_ui_dir *admin; |
| 2571 | int err; |
| 2572 | |
| 2573 | damon_sysfs_root = kobject_create_and_add("damon", mm_kobj); |
| 2574 | if (!damon_sysfs_root) |
| 2575 | return -ENOMEM; |
| 2576 | |
| 2577 | admin = damon_sysfs_ui_dir_alloc(); |
| 2578 | if (!admin) { |
| 2579 | kobject_put(damon_sysfs_root); |
| 2580 | return -ENOMEM; |
| 2581 | } |
| 2582 | err = kobject_init_and_add(&admin->kobj, &damon_sysfs_ui_dir_ktype, |
| 2583 | damon_sysfs_root, "admin"); |
| 2584 | if (err) |
| 2585 | goto out; |
| 2586 | err = damon_sysfs_ui_dir_add_dirs(admin); |
| 2587 | if (err) |
| 2588 | goto out; |
| 2589 | return 0; |
| 2590 | |
| 2591 | out: |
| 2592 | kobject_put(&admin->kobj); |
| 2593 | kobject_put(damon_sysfs_root); |
| 2594 | return err; |
| 2595 | } |
| 2596 | subsys_initcall(damon_sysfs_init); |