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f85d2086 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
39d3e758 PP |
2 | /* |
3 | * RDMA resource limiting controller for cgroups. | |
4 | * | |
5 | * Used to allow a cgroup hierarchy to stop processes from consuming | |
6 | * additional RDMA resources after a certain limit is reached. | |
7 | * | |
8 | * Copyright (C) 2016 Parav Pandit <pandit.parav@gmail.com> | |
39d3e758 PP |
9 | */ |
10 | ||
11 | #include <linux/bitops.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/cgroup.h> | |
15 | #include <linux/parser.h> | |
16 | #include <linux/cgroup_rdma.h> | |
17 | ||
18 | #define RDMACG_MAX_STR "max" | |
19 | ||
20 | /* | |
21 | * Protects list of resource pools maintained on per cgroup basis | |
22 | * and rdma device list. | |
23 | */ | |
24 | static DEFINE_MUTEX(rdmacg_mutex); | |
25 | static LIST_HEAD(rdmacg_devices); | |
26 | ||
27 | enum rdmacg_file_type { | |
28 | RDMACG_RESOURCE_TYPE_MAX, | |
29 | RDMACG_RESOURCE_TYPE_STAT, | |
30 | }; | |
31 | ||
32 | /* | |
33 | * resource table definition as to be seen by the user. | |
34 | * Need to add entries to it when more resources are | |
35 | * added/defined at IB verb/core layer. | |
36 | */ | |
37 | static char const *rdmacg_resource_names[] = { | |
38 | [RDMACG_RESOURCE_HCA_HANDLE] = "hca_handle", | |
39 | [RDMACG_RESOURCE_HCA_OBJECT] = "hca_object", | |
40 | }; | |
41 | ||
42 | /* resource tracker for each resource of rdma cgroup */ | |
43 | struct rdmacg_resource { | |
44 | int max; | |
45 | int usage; | |
46 | }; | |
47 | ||
48 | /* | |
49 | * resource pool object which represents per cgroup, per device | |
50 | * resources. There are multiple instances of this object per cgroup, | |
51 | * therefore it cannot be embedded within rdma_cgroup structure. It | |
52 | * is maintained as list. | |
53 | */ | |
54 | struct rdmacg_resource_pool { | |
55 | struct rdmacg_device *device; | |
56 | struct rdmacg_resource resources[RDMACG_RESOURCE_MAX]; | |
57 | ||
58 | struct list_head cg_node; | |
59 | struct list_head dev_node; | |
60 | ||
61 | /* count active user tasks of this pool */ | |
62 | u64 usage_sum; | |
63 | /* total number counts which are set to max */ | |
64 | int num_max_cnt; | |
65 | }; | |
66 | ||
67 | static struct rdma_cgroup *css_rdmacg(struct cgroup_subsys_state *css) | |
68 | { | |
69 | return container_of(css, struct rdma_cgroup, css); | |
70 | } | |
71 | ||
72 | static struct rdma_cgroup *parent_rdmacg(struct rdma_cgroup *cg) | |
73 | { | |
74 | return css_rdmacg(cg->css.parent); | |
75 | } | |
76 | ||
77 | static inline struct rdma_cgroup *get_current_rdmacg(void) | |
78 | { | |
79 | return css_rdmacg(task_get_css(current, rdma_cgrp_id)); | |
80 | } | |
81 | ||
82 | static void set_resource_limit(struct rdmacg_resource_pool *rpool, | |
83 | int index, int new_max) | |
84 | { | |
85 | if (new_max == S32_MAX) { | |
86 | if (rpool->resources[index].max != S32_MAX) | |
87 | rpool->num_max_cnt++; | |
88 | } else { | |
89 | if (rpool->resources[index].max == S32_MAX) | |
90 | rpool->num_max_cnt--; | |
91 | } | |
92 | rpool->resources[index].max = new_max; | |
93 | } | |
94 | ||
95 | static void set_all_resource_max_limit(struct rdmacg_resource_pool *rpool) | |
96 | { | |
97 | int i; | |
98 | ||
99 | for (i = 0; i < RDMACG_RESOURCE_MAX; i++) | |
100 | set_resource_limit(rpool, i, S32_MAX); | |
101 | } | |
102 | ||
103 | static void free_cg_rpool_locked(struct rdmacg_resource_pool *rpool) | |
104 | { | |
105 | lockdep_assert_held(&rdmacg_mutex); | |
106 | ||
107 | list_del(&rpool->cg_node); | |
108 | list_del(&rpool->dev_node); | |
109 | kfree(rpool); | |
110 | } | |
111 | ||
112 | static struct rdmacg_resource_pool * | |
113 | find_cg_rpool_locked(struct rdma_cgroup *cg, | |
114 | struct rdmacg_device *device) | |
115 | ||
116 | { | |
117 | struct rdmacg_resource_pool *pool; | |
118 | ||
119 | lockdep_assert_held(&rdmacg_mutex); | |
120 | ||
121 | list_for_each_entry(pool, &cg->rpools, cg_node) | |
122 | if (pool->device == device) | |
123 | return pool; | |
124 | ||
125 | return NULL; | |
126 | } | |
127 | ||
128 | static struct rdmacg_resource_pool * | |
129 | get_cg_rpool_locked(struct rdma_cgroup *cg, struct rdmacg_device *device) | |
130 | { | |
131 | struct rdmacg_resource_pool *rpool; | |
132 | ||
133 | rpool = find_cg_rpool_locked(cg, device); | |
134 | if (rpool) | |
135 | return rpool; | |
136 | ||
137 | rpool = kzalloc(sizeof(*rpool), GFP_KERNEL); | |
138 | if (!rpool) | |
139 | return ERR_PTR(-ENOMEM); | |
140 | ||
141 | rpool->device = device; | |
142 | set_all_resource_max_limit(rpool); | |
143 | ||
144 | INIT_LIST_HEAD(&rpool->cg_node); | |
145 | INIT_LIST_HEAD(&rpool->dev_node); | |
146 | list_add_tail(&rpool->cg_node, &cg->rpools); | |
147 | list_add_tail(&rpool->dev_node, &device->rpools); | |
148 | return rpool; | |
149 | } | |
150 | ||
151 | /** | |
152 | * uncharge_cg_locked - uncharge resource for rdma cgroup | |
153 | * @cg: pointer to cg to uncharge and all parents in hierarchy | |
154 | * @device: pointer to rdmacg device | |
155 | * @index: index of the resource to uncharge in cg (resource pool) | |
156 | * | |
157 | * It also frees the resource pool which was created as part of | |
158 | * charging operation when there are no resources attached to | |
159 | * resource pool. | |
160 | */ | |
161 | static void | |
162 | uncharge_cg_locked(struct rdma_cgroup *cg, | |
163 | struct rdmacg_device *device, | |
164 | enum rdmacg_resource_type index) | |
165 | { | |
166 | struct rdmacg_resource_pool *rpool; | |
167 | ||
168 | rpool = find_cg_rpool_locked(cg, device); | |
169 | ||
170 | /* | |
171 | * rpool cannot be null at this stage. Let kernel operate in case | |
172 | * if there a bug in IB stack or rdma controller, instead of crashing | |
173 | * the system. | |
174 | */ | |
175 | if (unlikely(!rpool)) { | |
176 | pr_warn("Invalid device %p or rdma cgroup %p\n", cg, device); | |
177 | return; | |
178 | } | |
179 | ||
180 | rpool->resources[index].usage--; | |
181 | ||
182 | /* | |
183 | * A negative count (or overflow) is invalid, | |
184 | * it indicates a bug in the rdma controller. | |
185 | */ | |
186 | WARN_ON_ONCE(rpool->resources[index].usage < 0); | |
187 | rpool->usage_sum--; | |
188 | if (rpool->usage_sum == 0 && | |
189 | rpool->num_max_cnt == RDMACG_RESOURCE_MAX) { | |
190 | /* | |
191 | * No user of the rpool and all entries are set to max, so | |
192 | * safe to delete this rpool. | |
193 | */ | |
194 | free_cg_rpool_locked(rpool); | |
195 | } | |
196 | } | |
197 | ||
198 | /** | |
199 | * rdmacg_uncharge_hierarchy - hierarchically uncharge rdma resource count | |
200 | * @device: pointer to rdmacg device | |
201 | * @stop_cg: while traversing hirerchy, when meet with stop_cg cgroup | |
202 | * stop uncharging | |
203 | * @index: index of the resource to uncharge in cg in given resource pool | |
204 | */ | |
205 | static void rdmacg_uncharge_hierarchy(struct rdma_cgroup *cg, | |
206 | struct rdmacg_device *device, | |
207 | struct rdma_cgroup *stop_cg, | |
208 | enum rdmacg_resource_type index) | |
209 | { | |
210 | struct rdma_cgroup *p; | |
211 | ||
212 | mutex_lock(&rdmacg_mutex); | |
213 | ||
214 | for (p = cg; p != stop_cg; p = parent_rdmacg(p)) | |
215 | uncharge_cg_locked(p, device, index); | |
216 | ||
217 | mutex_unlock(&rdmacg_mutex); | |
218 | ||
219 | css_put(&cg->css); | |
220 | } | |
221 | ||
222 | /** | |
223 | * rdmacg_uncharge - hierarchically uncharge rdma resource count | |
224 | * @device: pointer to rdmacg device | |
225 | * @index: index of the resource to uncharge in cgroup in given resource pool | |
226 | */ | |
227 | void rdmacg_uncharge(struct rdma_cgroup *cg, | |
228 | struct rdmacg_device *device, | |
229 | enum rdmacg_resource_type index) | |
230 | { | |
231 | if (index >= RDMACG_RESOURCE_MAX) | |
232 | return; | |
233 | ||
234 | rdmacg_uncharge_hierarchy(cg, device, NULL, index); | |
235 | } | |
236 | EXPORT_SYMBOL(rdmacg_uncharge); | |
237 | ||
238 | /** | |
239 | * rdmacg_try_charge - hierarchically try to charge the rdma resource | |
240 | * @rdmacg: pointer to rdma cgroup which will own this resource | |
241 | * @device: pointer to rdmacg device | |
242 | * @index: index of the resource to charge in cgroup (resource pool) | |
243 | * | |
244 | * This function follows charging resource in hierarchical way. | |
245 | * It will fail if the charge would cause the new value to exceed the | |
246 | * hierarchical limit. | |
247 | * Returns 0 if the charge succeded, otherwise -EAGAIN, -ENOMEM or -EINVAL. | |
248 | * Returns pointer to rdmacg for this resource when charging is successful. | |
249 | * | |
250 | * Charger needs to account resources on two criteria. | |
251 | * (a) per cgroup & (b) per device resource usage. | |
252 | * Per cgroup resource usage ensures that tasks of cgroup doesn't cross | |
253 | * the configured limits. Per device provides granular configuration | |
254 | * in multi device usage. It allocates resource pool in the hierarchy | |
255 | * for each parent it come across for first resource. Later on resource | |
256 | * pool will be available. Therefore it will be much faster thereon | |
257 | * to charge/uncharge. | |
258 | */ | |
259 | int rdmacg_try_charge(struct rdma_cgroup **rdmacg, | |
260 | struct rdmacg_device *device, | |
261 | enum rdmacg_resource_type index) | |
262 | { | |
263 | struct rdma_cgroup *cg, *p; | |
264 | struct rdmacg_resource_pool *rpool; | |
265 | s64 new; | |
266 | int ret = 0; | |
267 | ||
268 | if (index >= RDMACG_RESOURCE_MAX) | |
269 | return -EINVAL; | |
270 | ||
271 | /* | |
272 | * hold on to css, as cgroup can be removed but resource | |
273 | * accounting happens on css. | |
274 | */ | |
275 | cg = get_current_rdmacg(); | |
276 | ||
277 | mutex_lock(&rdmacg_mutex); | |
278 | for (p = cg; p; p = parent_rdmacg(p)) { | |
279 | rpool = get_cg_rpool_locked(p, device); | |
280 | if (IS_ERR(rpool)) { | |
281 | ret = PTR_ERR(rpool); | |
282 | goto err; | |
283 | } else { | |
284 | new = rpool->resources[index].usage + 1; | |
285 | if (new > rpool->resources[index].max) { | |
286 | ret = -EAGAIN; | |
287 | goto err; | |
288 | } else { | |
289 | rpool->resources[index].usage = new; | |
290 | rpool->usage_sum++; | |
291 | } | |
292 | } | |
293 | } | |
294 | mutex_unlock(&rdmacg_mutex); | |
295 | ||
296 | *rdmacg = cg; | |
297 | return 0; | |
298 | ||
299 | err: | |
300 | mutex_unlock(&rdmacg_mutex); | |
301 | rdmacg_uncharge_hierarchy(cg, device, p, index); | |
302 | return ret; | |
303 | } | |
304 | EXPORT_SYMBOL(rdmacg_try_charge); | |
305 | ||
306 | /** | |
307 | * rdmacg_register_device - register rdmacg device to rdma controller. | |
308 | * @device: pointer to rdmacg device whose resources need to be accounted. | |
309 | * | |
310 | * If IB stack wish a device to participate in rdma cgroup resource | |
311 | * tracking, it must invoke this API to register with rdma cgroup before | |
312 | * any user space application can start using the RDMA resources. | |
39d3e758 | 313 | */ |
7527a7b1 | 314 | void rdmacg_register_device(struct rdmacg_device *device) |
39d3e758 PP |
315 | { |
316 | INIT_LIST_HEAD(&device->dev_node); | |
317 | INIT_LIST_HEAD(&device->rpools); | |
318 | ||
319 | mutex_lock(&rdmacg_mutex); | |
320 | list_add_tail(&device->dev_node, &rdmacg_devices); | |
321 | mutex_unlock(&rdmacg_mutex); | |
39d3e758 PP |
322 | } |
323 | EXPORT_SYMBOL(rdmacg_register_device); | |
324 | ||
325 | /** | |
326 | * rdmacg_unregister_device - unregister rdmacg device from rdma controller. | |
327 | * @device: pointer to rdmacg device which was previously registered with rdma | |
328 | * controller using rdmacg_register_device(). | |
329 | * | |
330 | * IB stack must invoke this after all the resources of the IB device | |
331 | * are destroyed and after ensuring that no more resources will be created | |
332 | * when this API is invoked. | |
333 | */ | |
334 | void rdmacg_unregister_device(struct rdmacg_device *device) | |
335 | { | |
336 | struct rdmacg_resource_pool *rpool, *tmp; | |
337 | ||
338 | /* | |
339 | * Synchronize with any active resource settings, | |
340 | * usage query happening via configfs. | |
341 | */ | |
342 | mutex_lock(&rdmacg_mutex); | |
343 | list_del_init(&device->dev_node); | |
344 | ||
345 | /* | |
346 | * Now that this device is off the cgroup list, its safe to free | |
347 | * all the rpool resources. | |
348 | */ | |
349 | list_for_each_entry_safe(rpool, tmp, &device->rpools, dev_node) | |
350 | free_cg_rpool_locked(rpool); | |
351 | ||
352 | mutex_unlock(&rdmacg_mutex); | |
353 | } | |
354 | EXPORT_SYMBOL(rdmacg_unregister_device); | |
355 | ||
356 | static int parse_resource(char *c, int *intval) | |
357 | { | |
358 | substring_t argstr; | |
39d3e758 PP |
359 | char *name, *value = c; |
360 | size_t len; | |
cc659e76 | 361 | int ret, i; |
39d3e758 PP |
362 | |
363 | name = strsep(&value, "="); | |
364 | if (!name || !value) | |
365 | return -EINVAL; | |
366 | ||
cc659e76 AS |
367 | i = match_string(rdmacg_resource_names, RDMACG_RESOURCE_MAX, name); |
368 | if (i < 0) | |
369 | return i; | |
39d3e758 | 370 | |
cc659e76 | 371 | len = strlen(value); |
39d3e758 | 372 | |
cc659e76 AS |
373 | argstr.from = value; |
374 | argstr.to = value + len; | |
39d3e758 | 375 | |
cc659e76 AS |
376 | ret = match_int(&argstr, intval); |
377 | if (ret >= 0) { | |
378 | if (*intval < 0) | |
379 | return -EINVAL; | |
380 | return i; | |
381 | } | |
382 | if (strncmp(value, RDMACG_MAX_STR, len) == 0) { | |
383 | *intval = S32_MAX; | |
384 | return i; | |
39d3e758 PP |
385 | } |
386 | return -EINVAL; | |
387 | } | |
388 | ||
389 | static int rdmacg_parse_limits(char *options, | |
390 | int *new_limits, unsigned long *enables) | |
391 | { | |
392 | char *c; | |
393 | int err = -EINVAL; | |
394 | ||
395 | /* parse resource options */ | |
396 | while ((c = strsep(&options, " ")) != NULL) { | |
397 | int index, intval; | |
398 | ||
399 | index = parse_resource(c, &intval); | |
400 | if (index < 0) | |
401 | goto err; | |
402 | ||
403 | new_limits[index] = intval; | |
404 | *enables |= BIT(index); | |
405 | } | |
406 | return 0; | |
407 | ||
408 | err: | |
409 | return err; | |
410 | } | |
411 | ||
412 | static struct rdmacg_device *rdmacg_get_device_locked(const char *name) | |
413 | { | |
414 | struct rdmacg_device *device; | |
415 | ||
416 | lockdep_assert_held(&rdmacg_mutex); | |
417 | ||
418 | list_for_each_entry(device, &rdmacg_devices, dev_node) | |
419 | if (!strcmp(name, device->name)) | |
420 | return device; | |
421 | ||
422 | return NULL; | |
423 | } | |
424 | ||
425 | static ssize_t rdmacg_resource_set_max(struct kernfs_open_file *of, | |
426 | char *buf, size_t nbytes, loff_t off) | |
427 | { | |
428 | struct rdma_cgroup *cg = css_rdmacg(of_css(of)); | |
429 | const char *dev_name; | |
430 | struct rdmacg_resource_pool *rpool; | |
431 | struct rdmacg_device *device; | |
432 | char *options = strstrip(buf); | |
433 | int *new_limits; | |
434 | unsigned long enables = 0; | |
435 | int i = 0, ret = 0; | |
436 | ||
437 | /* extract the device name first */ | |
438 | dev_name = strsep(&options, " "); | |
439 | if (!dev_name) { | |
440 | ret = -EINVAL; | |
441 | goto err; | |
442 | } | |
443 | ||
444 | new_limits = kcalloc(RDMACG_RESOURCE_MAX, sizeof(int), GFP_KERNEL); | |
445 | if (!new_limits) { | |
446 | ret = -ENOMEM; | |
447 | goto err; | |
448 | } | |
449 | ||
450 | ret = rdmacg_parse_limits(options, new_limits, &enables); | |
451 | if (ret) | |
452 | goto parse_err; | |
453 | ||
454 | /* acquire lock to synchronize with hot plug devices */ | |
455 | mutex_lock(&rdmacg_mutex); | |
456 | ||
457 | device = rdmacg_get_device_locked(dev_name); | |
458 | if (!device) { | |
459 | ret = -ENODEV; | |
460 | goto dev_err; | |
461 | } | |
462 | ||
463 | rpool = get_cg_rpool_locked(cg, device); | |
464 | if (IS_ERR(rpool)) { | |
465 | ret = PTR_ERR(rpool); | |
466 | goto dev_err; | |
467 | } | |
468 | ||
469 | /* now set the new limits of the rpool */ | |
470 | for_each_set_bit(i, &enables, RDMACG_RESOURCE_MAX) | |
471 | set_resource_limit(rpool, i, new_limits[i]); | |
472 | ||
473 | if (rpool->usage_sum == 0 && | |
474 | rpool->num_max_cnt == RDMACG_RESOURCE_MAX) { | |
475 | /* | |
476 | * No user of the rpool and all entries are set to max, so | |
477 | * safe to delete this rpool. | |
478 | */ | |
479 | free_cg_rpool_locked(rpool); | |
480 | } | |
481 | ||
482 | dev_err: | |
483 | mutex_unlock(&rdmacg_mutex); | |
484 | ||
485 | parse_err: | |
486 | kfree(new_limits); | |
487 | ||
488 | err: | |
489 | return ret ?: nbytes; | |
490 | } | |
491 | ||
492 | static void print_rpool_values(struct seq_file *sf, | |
493 | struct rdmacg_resource_pool *rpool) | |
494 | { | |
495 | enum rdmacg_file_type sf_type; | |
496 | int i; | |
497 | u32 value; | |
498 | ||
499 | sf_type = seq_cft(sf)->private; | |
500 | ||
501 | for (i = 0; i < RDMACG_RESOURCE_MAX; i++) { | |
502 | seq_puts(sf, rdmacg_resource_names[i]); | |
503 | seq_putc(sf, '='); | |
504 | if (sf_type == RDMACG_RESOURCE_TYPE_MAX) { | |
505 | if (rpool) | |
506 | value = rpool->resources[i].max; | |
507 | else | |
508 | value = S32_MAX; | |
509 | } else { | |
510 | if (rpool) | |
511 | value = rpool->resources[i].usage; | |
7896dfb0 PP |
512 | else |
513 | value = 0; | |
39d3e758 PP |
514 | } |
515 | ||
516 | if (value == S32_MAX) | |
517 | seq_puts(sf, RDMACG_MAX_STR); | |
518 | else | |
519 | seq_printf(sf, "%d", value); | |
520 | seq_putc(sf, ' '); | |
521 | } | |
522 | } | |
523 | ||
524 | static int rdmacg_resource_read(struct seq_file *sf, void *v) | |
525 | { | |
526 | struct rdmacg_device *device; | |
527 | struct rdmacg_resource_pool *rpool; | |
528 | struct rdma_cgroup *cg = css_rdmacg(seq_css(sf)); | |
529 | ||
530 | mutex_lock(&rdmacg_mutex); | |
531 | ||
532 | list_for_each_entry(device, &rdmacg_devices, dev_node) { | |
533 | seq_printf(sf, "%s ", device->name); | |
534 | ||
535 | rpool = find_cg_rpool_locked(cg, device); | |
536 | print_rpool_values(sf, rpool); | |
537 | ||
538 | seq_putc(sf, '\n'); | |
539 | } | |
540 | ||
541 | mutex_unlock(&rdmacg_mutex); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static struct cftype rdmacg_files[] = { | |
546 | { | |
547 | .name = "max", | |
548 | .write = rdmacg_resource_set_max, | |
549 | .seq_show = rdmacg_resource_read, | |
550 | .private = RDMACG_RESOURCE_TYPE_MAX, | |
551 | .flags = CFTYPE_NOT_ON_ROOT, | |
552 | }, | |
553 | { | |
554 | .name = "current", | |
555 | .seq_show = rdmacg_resource_read, | |
556 | .private = RDMACG_RESOURCE_TYPE_STAT, | |
557 | .flags = CFTYPE_NOT_ON_ROOT, | |
558 | }, | |
559 | { } /* terminate */ | |
560 | }; | |
561 | ||
562 | static struct cgroup_subsys_state * | |
563 | rdmacg_css_alloc(struct cgroup_subsys_state *parent) | |
564 | { | |
565 | struct rdma_cgroup *cg; | |
566 | ||
567 | cg = kzalloc(sizeof(*cg), GFP_KERNEL); | |
568 | if (!cg) | |
569 | return ERR_PTR(-ENOMEM); | |
570 | ||
571 | INIT_LIST_HEAD(&cg->rpools); | |
572 | return &cg->css; | |
573 | } | |
574 | ||
575 | static void rdmacg_css_free(struct cgroup_subsys_state *css) | |
576 | { | |
577 | struct rdma_cgroup *cg = css_rdmacg(css); | |
578 | ||
579 | kfree(cg); | |
580 | } | |
581 | ||
582 | /** | |
583 | * rdmacg_css_offline - cgroup css_offline callback | |
584 | * @css: css of interest | |
585 | * | |
586 | * This function is called when @css is about to go away and responsible | |
587 | * for shooting down all rdmacg associated with @css. As part of that it | |
588 | * marks all the resource pool entries to max value, so that when resources are | |
589 | * uncharged, associated resource pool can be freed as well. | |
590 | */ | |
591 | static void rdmacg_css_offline(struct cgroup_subsys_state *css) | |
592 | { | |
593 | struct rdma_cgroup *cg = css_rdmacg(css); | |
594 | struct rdmacg_resource_pool *rpool; | |
595 | ||
596 | mutex_lock(&rdmacg_mutex); | |
597 | ||
598 | list_for_each_entry(rpool, &cg->rpools, cg_node) | |
599 | set_all_resource_max_limit(rpool); | |
600 | ||
601 | mutex_unlock(&rdmacg_mutex); | |
602 | } | |
603 | ||
604 | struct cgroup_subsys rdma_cgrp_subsys = { | |
605 | .css_alloc = rdmacg_css_alloc, | |
606 | .css_free = rdmacg_css_free, | |
607 | .css_offline = rdmacg_css_offline, | |
608 | .legacy_cftypes = rdmacg_files, | |
609 | .dfl_cftypes = rdmacg_files, | |
610 | }; |