Commit | Line | Data |
---|---|---|
39d3e758 PP |
1 | /* |
2 | * RDMA resource limiting controller for cgroups. | |
3 | * | |
4 | * Used to allow a cgroup hierarchy to stop processes from consuming | |
5 | * additional RDMA resources after a certain limit is reached. | |
6 | * | |
7 | * Copyright (C) 2016 Parav Pandit <pandit.parav@gmail.com> | |
8 | * | |
9 | * This file is subject to the terms and conditions of version 2 of the GNU | |
10 | * General Public License. See the file COPYING in the main directory of the | |
11 | * Linux distribution for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/bitops.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/cgroup.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/cgroup_rdma.h> | |
20 | ||
21 | #define RDMACG_MAX_STR "max" | |
22 | ||
23 | /* | |
24 | * Protects list of resource pools maintained on per cgroup basis | |
25 | * and rdma device list. | |
26 | */ | |
27 | static DEFINE_MUTEX(rdmacg_mutex); | |
28 | static LIST_HEAD(rdmacg_devices); | |
29 | ||
30 | enum rdmacg_file_type { | |
31 | RDMACG_RESOURCE_TYPE_MAX, | |
32 | RDMACG_RESOURCE_TYPE_STAT, | |
33 | }; | |
34 | ||
35 | /* | |
36 | * resource table definition as to be seen by the user. | |
37 | * Need to add entries to it when more resources are | |
38 | * added/defined at IB verb/core layer. | |
39 | */ | |
40 | static char const *rdmacg_resource_names[] = { | |
41 | [RDMACG_RESOURCE_HCA_HANDLE] = "hca_handle", | |
42 | [RDMACG_RESOURCE_HCA_OBJECT] = "hca_object", | |
43 | }; | |
44 | ||
45 | /* resource tracker for each resource of rdma cgroup */ | |
46 | struct rdmacg_resource { | |
47 | int max; | |
48 | int usage; | |
49 | }; | |
50 | ||
51 | /* | |
52 | * resource pool object which represents per cgroup, per device | |
53 | * resources. There are multiple instances of this object per cgroup, | |
54 | * therefore it cannot be embedded within rdma_cgroup structure. It | |
55 | * is maintained as list. | |
56 | */ | |
57 | struct rdmacg_resource_pool { | |
58 | struct rdmacg_device *device; | |
59 | struct rdmacg_resource resources[RDMACG_RESOURCE_MAX]; | |
60 | ||
61 | struct list_head cg_node; | |
62 | struct list_head dev_node; | |
63 | ||
64 | /* count active user tasks of this pool */ | |
65 | u64 usage_sum; | |
66 | /* total number counts which are set to max */ | |
67 | int num_max_cnt; | |
68 | }; | |
69 | ||
70 | static struct rdma_cgroup *css_rdmacg(struct cgroup_subsys_state *css) | |
71 | { | |
72 | return container_of(css, struct rdma_cgroup, css); | |
73 | } | |
74 | ||
75 | static struct rdma_cgroup *parent_rdmacg(struct rdma_cgroup *cg) | |
76 | { | |
77 | return css_rdmacg(cg->css.parent); | |
78 | } | |
79 | ||
80 | static inline struct rdma_cgroup *get_current_rdmacg(void) | |
81 | { | |
82 | return css_rdmacg(task_get_css(current, rdma_cgrp_id)); | |
83 | } | |
84 | ||
85 | static void set_resource_limit(struct rdmacg_resource_pool *rpool, | |
86 | int index, int new_max) | |
87 | { | |
88 | if (new_max == S32_MAX) { | |
89 | if (rpool->resources[index].max != S32_MAX) | |
90 | rpool->num_max_cnt++; | |
91 | } else { | |
92 | if (rpool->resources[index].max == S32_MAX) | |
93 | rpool->num_max_cnt--; | |
94 | } | |
95 | rpool->resources[index].max = new_max; | |
96 | } | |
97 | ||
98 | static void set_all_resource_max_limit(struct rdmacg_resource_pool *rpool) | |
99 | { | |
100 | int i; | |
101 | ||
102 | for (i = 0; i < RDMACG_RESOURCE_MAX; i++) | |
103 | set_resource_limit(rpool, i, S32_MAX); | |
104 | } | |
105 | ||
106 | static void free_cg_rpool_locked(struct rdmacg_resource_pool *rpool) | |
107 | { | |
108 | lockdep_assert_held(&rdmacg_mutex); | |
109 | ||
110 | list_del(&rpool->cg_node); | |
111 | list_del(&rpool->dev_node); | |
112 | kfree(rpool); | |
113 | } | |
114 | ||
115 | static struct rdmacg_resource_pool * | |
116 | find_cg_rpool_locked(struct rdma_cgroup *cg, | |
117 | struct rdmacg_device *device) | |
118 | ||
119 | { | |
120 | struct rdmacg_resource_pool *pool; | |
121 | ||
122 | lockdep_assert_held(&rdmacg_mutex); | |
123 | ||
124 | list_for_each_entry(pool, &cg->rpools, cg_node) | |
125 | if (pool->device == device) | |
126 | return pool; | |
127 | ||
128 | return NULL; | |
129 | } | |
130 | ||
131 | static struct rdmacg_resource_pool * | |
132 | get_cg_rpool_locked(struct rdma_cgroup *cg, struct rdmacg_device *device) | |
133 | { | |
134 | struct rdmacg_resource_pool *rpool; | |
135 | ||
136 | rpool = find_cg_rpool_locked(cg, device); | |
137 | if (rpool) | |
138 | return rpool; | |
139 | ||
140 | rpool = kzalloc(sizeof(*rpool), GFP_KERNEL); | |
141 | if (!rpool) | |
142 | return ERR_PTR(-ENOMEM); | |
143 | ||
144 | rpool->device = device; | |
145 | set_all_resource_max_limit(rpool); | |
146 | ||
147 | INIT_LIST_HEAD(&rpool->cg_node); | |
148 | INIT_LIST_HEAD(&rpool->dev_node); | |
149 | list_add_tail(&rpool->cg_node, &cg->rpools); | |
150 | list_add_tail(&rpool->dev_node, &device->rpools); | |
151 | return rpool; | |
152 | } | |
153 | ||
154 | /** | |
155 | * uncharge_cg_locked - uncharge resource for rdma cgroup | |
156 | * @cg: pointer to cg to uncharge and all parents in hierarchy | |
157 | * @device: pointer to rdmacg device | |
158 | * @index: index of the resource to uncharge in cg (resource pool) | |
159 | * | |
160 | * It also frees the resource pool which was created as part of | |
161 | * charging operation when there are no resources attached to | |
162 | * resource pool. | |
163 | */ | |
164 | static void | |
165 | uncharge_cg_locked(struct rdma_cgroup *cg, | |
166 | struct rdmacg_device *device, | |
167 | enum rdmacg_resource_type index) | |
168 | { | |
169 | struct rdmacg_resource_pool *rpool; | |
170 | ||
171 | rpool = find_cg_rpool_locked(cg, device); | |
172 | ||
173 | /* | |
174 | * rpool cannot be null at this stage. Let kernel operate in case | |
175 | * if there a bug in IB stack or rdma controller, instead of crashing | |
176 | * the system. | |
177 | */ | |
178 | if (unlikely(!rpool)) { | |
179 | pr_warn("Invalid device %p or rdma cgroup %p\n", cg, device); | |
180 | return; | |
181 | } | |
182 | ||
183 | rpool->resources[index].usage--; | |
184 | ||
185 | /* | |
186 | * A negative count (or overflow) is invalid, | |
187 | * it indicates a bug in the rdma controller. | |
188 | */ | |
189 | WARN_ON_ONCE(rpool->resources[index].usage < 0); | |
190 | rpool->usage_sum--; | |
191 | if (rpool->usage_sum == 0 && | |
192 | rpool->num_max_cnt == RDMACG_RESOURCE_MAX) { | |
193 | /* | |
194 | * No user of the rpool and all entries are set to max, so | |
195 | * safe to delete this rpool. | |
196 | */ | |
197 | free_cg_rpool_locked(rpool); | |
198 | } | |
199 | } | |
200 | ||
201 | /** | |
202 | * rdmacg_uncharge_hierarchy - hierarchically uncharge rdma resource count | |
203 | * @device: pointer to rdmacg device | |
204 | * @stop_cg: while traversing hirerchy, when meet with stop_cg cgroup | |
205 | * stop uncharging | |
206 | * @index: index of the resource to uncharge in cg in given resource pool | |
207 | */ | |
208 | static void rdmacg_uncharge_hierarchy(struct rdma_cgroup *cg, | |
209 | struct rdmacg_device *device, | |
210 | struct rdma_cgroup *stop_cg, | |
211 | enum rdmacg_resource_type index) | |
212 | { | |
213 | struct rdma_cgroup *p; | |
214 | ||
215 | mutex_lock(&rdmacg_mutex); | |
216 | ||
217 | for (p = cg; p != stop_cg; p = parent_rdmacg(p)) | |
218 | uncharge_cg_locked(p, device, index); | |
219 | ||
220 | mutex_unlock(&rdmacg_mutex); | |
221 | ||
222 | css_put(&cg->css); | |
223 | } | |
224 | ||
225 | /** | |
226 | * rdmacg_uncharge - hierarchically uncharge rdma resource count | |
227 | * @device: pointer to rdmacg device | |
228 | * @index: index of the resource to uncharge in cgroup in given resource pool | |
229 | */ | |
230 | void rdmacg_uncharge(struct rdma_cgroup *cg, | |
231 | struct rdmacg_device *device, | |
232 | enum rdmacg_resource_type index) | |
233 | { | |
234 | if (index >= RDMACG_RESOURCE_MAX) | |
235 | return; | |
236 | ||
237 | rdmacg_uncharge_hierarchy(cg, device, NULL, index); | |
238 | } | |
239 | EXPORT_SYMBOL(rdmacg_uncharge); | |
240 | ||
241 | /** | |
242 | * rdmacg_try_charge - hierarchically try to charge the rdma resource | |
243 | * @rdmacg: pointer to rdma cgroup which will own this resource | |
244 | * @device: pointer to rdmacg device | |
245 | * @index: index of the resource to charge in cgroup (resource pool) | |
246 | * | |
247 | * This function follows charging resource in hierarchical way. | |
248 | * It will fail if the charge would cause the new value to exceed the | |
249 | * hierarchical limit. | |
250 | * Returns 0 if the charge succeded, otherwise -EAGAIN, -ENOMEM or -EINVAL. | |
251 | * Returns pointer to rdmacg for this resource when charging is successful. | |
252 | * | |
253 | * Charger needs to account resources on two criteria. | |
254 | * (a) per cgroup & (b) per device resource usage. | |
255 | * Per cgroup resource usage ensures that tasks of cgroup doesn't cross | |
256 | * the configured limits. Per device provides granular configuration | |
257 | * in multi device usage. It allocates resource pool in the hierarchy | |
258 | * for each parent it come across for first resource. Later on resource | |
259 | * pool will be available. Therefore it will be much faster thereon | |
260 | * to charge/uncharge. | |
261 | */ | |
262 | int rdmacg_try_charge(struct rdma_cgroup **rdmacg, | |
263 | struct rdmacg_device *device, | |
264 | enum rdmacg_resource_type index) | |
265 | { | |
266 | struct rdma_cgroup *cg, *p; | |
267 | struct rdmacg_resource_pool *rpool; | |
268 | s64 new; | |
269 | int ret = 0; | |
270 | ||
271 | if (index >= RDMACG_RESOURCE_MAX) | |
272 | return -EINVAL; | |
273 | ||
274 | /* | |
275 | * hold on to css, as cgroup can be removed but resource | |
276 | * accounting happens on css. | |
277 | */ | |
278 | cg = get_current_rdmacg(); | |
279 | ||
280 | mutex_lock(&rdmacg_mutex); | |
281 | for (p = cg; p; p = parent_rdmacg(p)) { | |
282 | rpool = get_cg_rpool_locked(p, device); | |
283 | if (IS_ERR(rpool)) { | |
284 | ret = PTR_ERR(rpool); | |
285 | goto err; | |
286 | } else { | |
287 | new = rpool->resources[index].usage + 1; | |
288 | if (new > rpool->resources[index].max) { | |
289 | ret = -EAGAIN; | |
290 | goto err; | |
291 | } else { | |
292 | rpool->resources[index].usage = new; | |
293 | rpool->usage_sum++; | |
294 | } | |
295 | } | |
296 | } | |
297 | mutex_unlock(&rdmacg_mutex); | |
298 | ||
299 | *rdmacg = cg; | |
300 | return 0; | |
301 | ||
302 | err: | |
303 | mutex_unlock(&rdmacg_mutex); | |
304 | rdmacg_uncharge_hierarchy(cg, device, p, index); | |
305 | return ret; | |
306 | } | |
307 | EXPORT_SYMBOL(rdmacg_try_charge); | |
308 | ||
309 | /** | |
310 | * rdmacg_register_device - register rdmacg device to rdma controller. | |
311 | * @device: pointer to rdmacg device whose resources need to be accounted. | |
312 | * | |
313 | * If IB stack wish a device to participate in rdma cgroup resource | |
314 | * tracking, it must invoke this API to register with rdma cgroup before | |
315 | * any user space application can start using the RDMA resources. | |
316 | * Returns 0 on success or EINVAL when table length given is beyond | |
317 | * supported size. | |
318 | */ | |
319 | int rdmacg_register_device(struct rdmacg_device *device) | |
320 | { | |
321 | INIT_LIST_HEAD(&device->dev_node); | |
322 | INIT_LIST_HEAD(&device->rpools); | |
323 | ||
324 | mutex_lock(&rdmacg_mutex); | |
325 | list_add_tail(&device->dev_node, &rdmacg_devices); | |
326 | mutex_unlock(&rdmacg_mutex); | |
327 | return 0; | |
328 | } | |
329 | EXPORT_SYMBOL(rdmacg_register_device); | |
330 | ||
331 | /** | |
332 | * rdmacg_unregister_device - unregister rdmacg device from rdma controller. | |
333 | * @device: pointer to rdmacg device which was previously registered with rdma | |
334 | * controller using rdmacg_register_device(). | |
335 | * | |
336 | * IB stack must invoke this after all the resources of the IB device | |
337 | * are destroyed and after ensuring that no more resources will be created | |
338 | * when this API is invoked. | |
339 | */ | |
340 | void rdmacg_unregister_device(struct rdmacg_device *device) | |
341 | { | |
342 | struct rdmacg_resource_pool *rpool, *tmp; | |
343 | ||
344 | /* | |
345 | * Synchronize with any active resource settings, | |
346 | * usage query happening via configfs. | |
347 | */ | |
348 | mutex_lock(&rdmacg_mutex); | |
349 | list_del_init(&device->dev_node); | |
350 | ||
351 | /* | |
352 | * Now that this device is off the cgroup list, its safe to free | |
353 | * all the rpool resources. | |
354 | */ | |
355 | list_for_each_entry_safe(rpool, tmp, &device->rpools, dev_node) | |
356 | free_cg_rpool_locked(rpool); | |
357 | ||
358 | mutex_unlock(&rdmacg_mutex); | |
359 | } | |
360 | EXPORT_SYMBOL(rdmacg_unregister_device); | |
361 | ||
362 | static int parse_resource(char *c, int *intval) | |
363 | { | |
364 | substring_t argstr; | |
365 | const char **table = &rdmacg_resource_names[0]; | |
366 | char *name, *value = c; | |
367 | size_t len; | |
368 | int ret, i = 0; | |
369 | ||
370 | name = strsep(&value, "="); | |
371 | if (!name || !value) | |
372 | return -EINVAL; | |
373 | ||
374 | len = strlen(value); | |
375 | ||
376 | for (i = 0; i < RDMACG_RESOURCE_MAX; i++) { | |
377 | if (strcmp(table[i], name)) | |
378 | continue; | |
379 | ||
380 | argstr.from = value; | |
381 | argstr.to = value + len; | |
382 | ||
383 | ret = match_int(&argstr, intval); | |
384 | if (ret >= 0) { | |
385 | if (*intval < 0) | |
386 | break; | |
387 | return i; | |
388 | } | |
389 | if (strncmp(value, RDMACG_MAX_STR, len) == 0) { | |
390 | *intval = S32_MAX; | |
391 | return i; | |
392 | } | |
393 | break; | |
394 | } | |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | static int rdmacg_parse_limits(char *options, | |
399 | int *new_limits, unsigned long *enables) | |
400 | { | |
401 | char *c; | |
402 | int err = -EINVAL; | |
403 | ||
404 | /* parse resource options */ | |
405 | while ((c = strsep(&options, " ")) != NULL) { | |
406 | int index, intval; | |
407 | ||
408 | index = parse_resource(c, &intval); | |
409 | if (index < 0) | |
410 | goto err; | |
411 | ||
412 | new_limits[index] = intval; | |
413 | *enables |= BIT(index); | |
414 | } | |
415 | return 0; | |
416 | ||
417 | err: | |
418 | return err; | |
419 | } | |
420 | ||
421 | static struct rdmacg_device *rdmacg_get_device_locked(const char *name) | |
422 | { | |
423 | struct rdmacg_device *device; | |
424 | ||
425 | lockdep_assert_held(&rdmacg_mutex); | |
426 | ||
427 | list_for_each_entry(device, &rdmacg_devices, dev_node) | |
428 | if (!strcmp(name, device->name)) | |
429 | return device; | |
430 | ||
431 | return NULL; | |
432 | } | |
433 | ||
434 | static ssize_t rdmacg_resource_set_max(struct kernfs_open_file *of, | |
435 | char *buf, size_t nbytes, loff_t off) | |
436 | { | |
437 | struct rdma_cgroup *cg = css_rdmacg(of_css(of)); | |
438 | const char *dev_name; | |
439 | struct rdmacg_resource_pool *rpool; | |
440 | struct rdmacg_device *device; | |
441 | char *options = strstrip(buf); | |
442 | int *new_limits; | |
443 | unsigned long enables = 0; | |
444 | int i = 0, ret = 0; | |
445 | ||
446 | /* extract the device name first */ | |
447 | dev_name = strsep(&options, " "); | |
448 | if (!dev_name) { | |
449 | ret = -EINVAL; | |
450 | goto err; | |
451 | } | |
452 | ||
453 | new_limits = kcalloc(RDMACG_RESOURCE_MAX, sizeof(int), GFP_KERNEL); | |
454 | if (!new_limits) { | |
455 | ret = -ENOMEM; | |
456 | goto err; | |
457 | } | |
458 | ||
459 | ret = rdmacg_parse_limits(options, new_limits, &enables); | |
460 | if (ret) | |
461 | goto parse_err; | |
462 | ||
463 | /* acquire lock to synchronize with hot plug devices */ | |
464 | mutex_lock(&rdmacg_mutex); | |
465 | ||
466 | device = rdmacg_get_device_locked(dev_name); | |
467 | if (!device) { | |
468 | ret = -ENODEV; | |
469 | goto dev_err; | |
470 | } | |
471 | ||
472 | rpool = get_cg_rpool_locked(cg, device); | |
473 | if (IS_ERR(rpool)) { | |
474 | ret = PTR_ERR(rpool); | |
475 | goto dev_err; | |
476 | } | |
477 | ||
478 | /* now set the new limits of the rpool */ | |
479 | for_each_set_bit(i, &enables, RDMACG_RESOURCE_MAX) | |
480 | set_resource_limit(rpool, i, new_limits[i]); | |
481 | ||
482 | if (rpool->usage_sum == 0 && | |
483 | rpool->num_max_cnt == RDMACG_RESOURCE_MAX) { | |
484 | /* | |
485 | * No user of the rpool and all entries are set to max, so | |
486 | * safe to delete this rpool. | |
487 | */ | |
488 | free_cg_rpool_locked(rpool); | |
489 | } | |
490 | ||
491 | dev_err: | |
492 | mutex_unlock(&rdmacg_mutex); | |
493 | ||
494 | parse_err: | |
495 | kfree(new_limits); | |
496 | ||
497 | err: | |
498 | return ret ?: nbytes; | |
499 | } | |
500 | ||
501 | static void print_rpool_values(struct seq_file *sf, | |
502 | struct rdmacg_resource_pool *rpool) | |
503 | { | |
504 | enum rdmacg_file_type sf_type; | |
505 | int i; | |
506 | u32 value; | |
507 | ||
508 | sf_type = seq_cft(sf)->private; | |
509 | ||
510 | for (i = 0; i < RDMACG_RESOURCE_MAX; i++) { | |
511 | seq_puts(sf, rdmacg_resource_names[i]); | |
512 | seq_putc(sf, '='); | |
513 | if (sf_type == RDMACG_RESOURCE_TYPE_MAX) { | |
514 | if (rpool) | |
515 | value = rpool->resources[i].max; | |
516 | else | |
517 | value = S32_MAX; | |
518 | } else { | |
519 | if (rpool) | |
520 | value = rpool->resources[i].usage; | |
7896dfb0 PP |
521 | else |
522 | value = 0; | |
39d3e758 PP |
523 | } |
524 | ||
525 | if (value == S32_MAX) | |
526 | seq_puts(sf, RDMACG_MAX_STR); | |
527 | else | |
528 | seq_printf(sf, "%d", value); | |
529 | seq_putc(sf, ' '); | |
530 | } | |
531 | } | |
532 | ||
533 | static int rdmacg_resource_read(struct seq_file *sf, void *v) | |
534 | { | |
535 | struct rdmacg_device *device; | |
536 | struct rdmacg_resource_pool *rpool; | |
537 | struct rdma_cgroup *cg = css_rdmacg(seq_css(sf)); | |
538 | ||
539 | mutex_lock(&rdmacg_mutex); | |
540 | ||
541 | list_for_each_entry(device, &rdmacg_devices, dev_node) { | |
542 | seq_printf(sf, "%s ", device->name); | |
543 | ||
544 | rpool = find_cg_rpool_locked(cg, device); | |
545 | print_rpool_values(sf, rpool); | |
546 | ||
547 | seq_putc(sf, '\n'); | |
548 | } | |
549 | ||
550 | mutex_unlock(&rdmacg_mutex); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static struct cftype rdmacg_files[] = { | |
555 | { | |
556 | .name = "max", | |
557 | .write = rdmacg_resource_set_max, | |
558 | .seq_show = rdmacg_resource_read, | |
559 | .private = RDMACG_RESOURCE_TYPE_MAX, | |
560 | .flags = CFTYPE_NOT_ON_ROOT, | |
561 | }, | |
562 | { | |
563 | .name = "current", | |
564 | .seq_show = rdmacg_resource_read, | |
565 | .private = RDMACG_RESOURCE_TYPE_STAT, | |
566 | .flags = CFTYPE_NOT_ON_ROOT, | |
567 | }, | |
568 | { } /* terminate */ | |
569 | }; | |
570 | ||
571 | static struct cgroup_subsys_state * | |
572 | rdmacg_css_alloc(struct cgroup_subsys_state *parent) | |
573 | { | |
574 | struct rdma_cgroup *cg; | |
575 | ||
576 | cg = kzalloc(sizeof(*cg), GFP_KERNEL); | |
577 | if (!cg) | |
578 | return ERR_PTR(-ENOMEM); | |
579 | ||
580 | INIT_LIST_HEAD(&cg->rpools); | |
581 | return &cg->css; | |
582 | } | |
583 | ||
584 | static void rdmacg_css_free(struct cgroup_subsys_state *css) | |
585 | { | |
586 | struct rdma_cgroup *cg = css_rdmacg(css); | |
587 | ||
588 | kfree(cg); | |
589 | } | |
590 | ||
591 | /** | |
592 | * rdmacg_css_offline - cgroup css_offline callback | |
593 | * @css: css of interest | |
594 | * | |
595 | * This function is called when @css is about to go away and responsible | |
596 | * for shooting down all rdmacg associated with @css. As part of that it | |
597 | * marks all the resource pool entries to max value, so that when resources are | |
598 | * uncharged, associated resource pool can be freed as well. | |
599 | */ | |
600 | static void rdmacg_css_offline(struct cgroup_subsys_state *css) | |
601 | { | |
602 | struct rdma_cgroup *cg = css_rdmacg(css); | |
603 | struct rdmacg_resource_pool *rpool; | |
604 | ||
605 | mutex_lock(&rdmacg_mutex); | |
606 | ||
607 | list_for_each_entry(rpool, &cg->rpools, cg_node) | |
608 | set_all_resource_max_limit(rpool); | |
609 | ||
610 | mutex_unlock(&rdmacg_mutex); | |
611 | } | |
612 | ||
613 | struct cgroup_subsys rdma_cgrp_subsys = { | |
614 | .css_alloc = rdmacg_css_alloc, | |
615 | .css_free = rdmacg_css_free, | |
616 | .css_offline = rdmacg_css_offline, | |
617 | .legacy_cftypes = rdmacg_files, | |
618 | .dfl_cftypes = rdmacg_files, | |
619 | }; |