Commit | Line | Data |
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08b21fbf | 1 | // SPDX-License-Identifier: GPL-2.0 |
16295bec SK |
2 | /* |
3 | * padata.c - generic interface to process data streams in parallel | |
4 | * | |
107f8bda SK |
5 | * See Documentation/padata.txt for an api documentation. |
6 | * | |
16295bec SK |
7 | * Copyright (C) 2008, 2009 secunet Security Networks AG |
8 | * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms and conditions of the GNU General Public License, | |
12 | * version 2, as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | * more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along with | |
20 | * this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
9984de1a | 24 | #include <linux/export.h> |
16295bec SK |
25 | #include <linux/cpumask.h> |
26 | #include <linux/err.h> | |
27 | #include <linux/cpu.h> | |
28 | #include <linux/padata.h> | |
29 | #include <linux/mutex.h> | |
30 | #include <linux/sched.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
5e017dc3 | 32 | #include <linux/sysfs.h> |
16295bec | 33 | #include <linux/rcupdate.h> |
30e92153 | 34 | #include <linux/module.h> |
16295bec | 35 | |
97e3d94a | 36 | #define MAX_OBJ_NUM 1000 |
16295bec SK |
37 | |
38 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) | |
39 | { | |
40 | int cpu, target_cpu; | |
41 | ||
e15bacbe | 42 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
16295bec | 43 | for (cpu = 0; cpu < cpu_index; cpu++) |
e15bacbe | 44 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
16295bec SK |
45 | |
46 | return target_cpu; | |
47 | } | |
48 | ||
2dc9b5db | 49 | static int padata_cpu_hash(struct parallel_data *pd) |
16295bec | 50 | { |
0b6b098e | 51 | unsigned int seq_nr; |
16295bec | 52 | int cpu_index; |
16295bec SK |
53 | |
54 | /* | |
55 | * Hash the sequence numbers to the cpus by taking | |
56 | * seq_nr mod. number of cpus in use. | |
57 | */ | |
2dc9b5db | 58 | |
0b6b098e MK |
59 | seq_nr = atomic_inc_return(&pd->seq_nr); |
60 | cpu_index = seq_nr % cpumask_weight(pd->cpumask.pcpu); | |
16295bec SK |
61 | |
62 | return padata_index_to_cpu(pd, cpu_index); | |
63 | } | |
64 | ||
e15bacbe | 65 | static void padata_parallel_worker(struct work_struct *parallel_work) |
16295bec | 66 | { |
e15bacbe | 67 | struct padata_parallel_queue *pqueue; |
16295bec SK |
68 | LIST_HEAD(local_list); |
69 | ||
70 | local_bh_disable(); | |
e15bacbe DK |
71 | pqueue = container_of(parallel_work, |
72 | struct padata_parallel_queue, work); | |
16295bec | 73 | |
e15bacbe DK |
74 | spin_lock(&pqueue->parallel.lock); |
75 | list_replace_init(&pqueue->parallel.list, &local_list); | |
76 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
77 | |
78 | while (!list_empty(&local_list)) { | |
79 | struct padata_priv *padata; | |
80 | ||
81 | padata = list_entry(local_list.next, | |
82 | struct padata_priv, list); | |
83 | ||
84 | list_del_init(&padata->list); | |
85 | ||
86 | padata->parallel(padata); | |
87 | } | |
88 | ||
89 | local_bh_enable(); | |
90 | } | |
91 | ||
0198ffd1 | 92 | /** |
16295bec SK |
93 | * padata_do_parallel - padata parallelization function |
94 | * | |
95 | * @pinst: padata instance | |
96 | * @padata: object to be parallelized | |
97 | * @cb_cpu: cpu the serialization callback function will run on, | |
e15bacbe | 98 | * must be in the serial cpumask of padata(i.e. cpumask.cbcpu). |
16295bec SK |
99 | * |
100 | * The parallelization callback function will run with BHs off. | |
101 | * Note: Every object which is parallelized by padata_do_parallel | |
102 | * must be seen by padata_do_serial. | |
103 | */ | |
104 | int padata_do_parallel(struct padata_instance *pinst, | |
105 | struct padata_priv *padata, int cb_cpu) | |
106 | { | |
107 | int target_cpu, err; | |
e15bacbe | 108 | struct padata_parallel_queue *queue; |
16295bec SK |
109 | struct parallel_data *pd; |
110 | ||
111 | rcu_read_lock_bh(); | |
112 | ||
c0e656b7 | 113 | pd = rcu_dereference_bh(pinst->pd); |
16295bec | 114 | |
83f619f3 | 115 | err = -EINVAL; |
7424713b | 116 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
117 | goto out; |
118 | ||
e15bacbe | 119 | if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu)) |
16295bec SK |
120 | goto out; |
121 | ||
122 | err = -EBUSY; | |
123 | if ((pinst->flags & PADATA_RESET)) | |
124 | goto out; | |
125 | ||
126 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
127 | goto out; | |
128 | ||
83f619f3 | 129 | err = 0; |
16295bec SK |
130 | atomic_inc(&pd->refcnt); |
131 | padata->pd = pd; | |
132 | padata->cb_cpu = cb_cpu; | |
133 | ||
2dc9b5db | 134 | target_cpu = padata_cpu_hash(pd); |
350ef88e | 135 | padata->cpu = target_cpu; |
e15bacbe | 136 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
137 | |
138 | spin_lock(&queue->parallel.lock); | |
139 | list_add_tail(&padata->list, &queue->parallel.list); | |
140 | spin_unlock(&queue->parallel.lock); | |
141 | ||
e15bacbe | 142 | queue_work_on(target_cpu, pinst->wq, &queue->work); |
16295bec SK |
143 | |
144 | out: | |
145 | rcu_read_unlock_bh(); | |
146 | ||
147 | return err; | |
148 | } | |
149 | EXPORT_SYMBOL(padata_do_parallel); | |
150 | ||
0198ffd1 SK |
151 | /* |
152 | * padata_get_next - Get the next object that needs serialization. | |
153 | * | |
154 | * Return values are: | |
155 | * | |
156 | * A pointer to the control struct of the next object that needs | |
157 | * serialization, if present in one of the percpu reorder queues. | |
158 | * | |
0198ffd1 SK |
159 | * -EINPROGRESS, if the next object that needs serialization will |
160 | * be parallel processed by another cpu and is not yet present in | |
161 | * the cpu's reorder queue. | |
162 | * | |
163 | * -ENODATA, if this cpu has to do the parallel processing for | |
164 | * the next object. | |
165 | */ | |
16295bec SK |
166 | static struct padata_priv *padata_get_next(struct parallel_data *pd) |
167 | { | |
f0fcf200 | 168 | struct padata_parallel_queue *next_queue; |
16295bec SK |
169 | struct padata_priv *padata; |
170 | struct padata_list *reorder; | |
6fc4dbcf | 171 | int cpu = pd->cpu; |
16295bec | 172 | |
e15bacbe | 173 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec SK |
174 | reorder = &next_queue->reorder; |
175 | ||
de5540d0 | 176 | spin_lock(&reorder->lock); |
16295bec SK |
177 | if (!list_empty(&reorder->list)) { |
178 | padata = list_entry(reorder->list.next, | |
179 | struct padata_priv, list); | |
180 | ||
16295bec SK |
181 | list_del_init(&padata->list); |
182 | atomic_dec(&pd->reorder_objects); | |
16295bec | 183 | |
6fc4dbcf HX |
184 | pd->cpu = cpumask_next_wrap(cpu, pd->cpumask.pcpu, -1, |
185 | false); | |
16295bec | 186 | |
de5540d0 | 187 | spin_unlock(&reorder->lock); |
16295bec SK |
188 | goto out; |
189 | } | |
de5540d0 | 190 | spin_unlock(&reorder->lock); |
16295bec | 191 | |
f0fcf200 | 192 | if (__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index) { |
16295bec SK |
193 | padata = ERR_PTR(-ENODATA); |
194 | goto out; | |
195 | } | |
196 | ||
197 | padata = ERR_PTR(-EINPROGRESS); | |
198 | out: | |
199 | return padata; | |
200 | } | |
201 | ||
202 | static void padata_reorder(struct parallel_data *pd) | |
203 | { | |
3047817b | 204 | int cb_cpu; |
16295bec | 205 | struct padata_priv *padata; |
e15bacbe | 206 | struct padata_serial_queue *squeue; |
16295bec | 207 | struct padata_instance *pinst = pd->pinst; |
6fc4dbcf | 208 | struct padata_parallel_queue *next_queue; |
16295bec | 209 | |
0198ffd1 SK |
210 | /* |
211 | * We need to ensure that only one cpu can work on dequeueing of | |
212 | * the reorder queue the time. Calculating in which percpu reorder | |
213 | * queue the next object will arrive takes some time. A spinlock | |
214 | * would be highly contended. Also it is not clear in which order | |
215 | * the objects arrive to the reorder queues. So a cpu could wait to | |
216 | * get the lock just to notice that there is nothing to do at the | |
217 | * moment. Therefore we use a trylock and let the holder of the lock | |
218 | * care for all the objects enqueued during the holdtime of the lock. | |
219 | */ | |
16295bec | 220 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 221 | return; |
16295bec SK |
222 | |
223 | while (1) { | |
224 | padata = padata_get_next(pd); | |
225 | ||
0198ffd1 | 226 | /* |
69b34844 JD |
227 | * If the next object that needs serialization is parallel |
228 | * processed by another cpu and is still on it's way to the | |
229 | * cpu's reorder queue, nothing to do for now. | |
0198ffd1 | 230 | */ |
69b34844 | 231 | if (PTR_ERR(padata) == -EINPROGRESS) |
16295bec SK |
232 | break; |
233 | ||
0198ffd1 SK |
234 | /* |
235 | * This cpu has to do the parallel processing of the next | |
236 | * object. It's waiting in the cpu's parallelization queue, | |
25985edc | 237 | * so exit immediately. |
0198ffd1 | 238 | */ |
16295bec SK |
239 | if (PTR_ERR(padata) == -ENODATA) { |
240 | spin_unlock_bh(&pd->lock); | |
d46a5ac7 | 241 | return; |
16295bec SK |
242 | } |
243 | ||
3047817b SK |
244 | cb_cpu = padata->cb_cpu; |
245 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 246 | |
e15bacbe DK |
247 | spin_lock(&squeue->serial.lock); |
248 | list_add_tail(&padata->list, &squeue->serial.list); | |
249 | spin_unlock(&squeue->serial.lock); | |
16295bec | 250 | |
3047817b | 251 | queue_work_on(cb_cpu, pinst->wq, &squeue->work); |
16295bec SK |
252 | } |
253 | ||
254 | spin_unlock_bh(&pd->lock); | |
255 | ||
0198ffd1 SK |
256 | /* |
257 | * The next object that needs serialization might have arrived to | |
6fc4dbcf | 258 | * the reorder queues in the meantime. |
cf144f81 | 259 | * |
6fc4dbcf HX |
260 | * Ensure reorder queue is read after pd->lock is dropped so we see |
261 | * new objects from another task in padata_do_serial. Pairs with | |
cf144f81 | 262 | * smp_mb__after_atomic in padata_do_serial. |
0198ffd1 | 263 | */ |
cf144f81 | 264 | smp_mb(); |
16295bec | 265 | |
6fc4dbcf HX |
266 | next_queue = per_cpu_ptr(pd->pqueue, pd->cpu); |
267 | if (!list_empty(&next_queue->reorder.list)) | |
268 | queue_work(pinst->wq, &pd->reorder_work); | |
16295bec SK |
269 | } |
270 | ||
cf5868c8 MK |
271 | static void invoke_padata_reorder(struct work_struct *work) |
272 | { | |
cf5868c8 MK |
273 | struct parallel_data *pd; |
274 | ||
275 | local_bh_disable(); | |
6fc4dbcf | 276 | pd = container_of(work, struct parallel_data, reorder_work); |
cf5868c8 MK |
277 | padata_reorder(pd); |
278 | local_bh_enable(); | |
279 | } | |
280 | ||
e15bacbe | 281 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 282 | { |
e15bacbe | 283 | struct padata_serial_queue *squeue; |
16295bec SK |
284 | struct parallel_data *pd; |
285 | LIST_HEAD(local_list); | |
286 | ||
287 | local_bh_disable(); | |
e15bacbe DK |
288 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
289 | pd = squeue->pd; | |
16295bec | 290 | |
e15bacbe DK |
291 | spin_lock(&squeue->serial.lock); |
292 | list_replace_init(&squeue->serial.list, &local_list); | |
293 | spin_unlock(&squeue->serial.lock); | |
16295bec SK |
294 | |
295 | while (!list_empty(&local_list)) { | |
296 | struct padata_priv *padata; | |
297 | ||
298 | padata = list_entry(local_list.next, | |
299 | struct padata_priv, list); | |
300 | ||
301 | list_del_init(&padata->list); | |
302 | ||
303 | padata->serial(padata); | |
304 | atomic_dec(&pd->refcnt); | |
305 | } | |
306 | local_bh_enable(); | |
307 | } | |
308 | ||
0198ffd1 | 309 | /** |
16295bec SK |
310 | * padata_do_serial - padata serialization function |
311 | * | |
312 | * @padata: object to be serialized. | |
313 | * | |
314 | * padata_do_serial must be called for every parallelized object. | |
315 | * The serialization callback function will run with BHs off. | |
316 | */ | |
317 | void padata_do_serial(struct padata_priv *padata) | |
318 | { | |
319 | int cpu; | |
e15bacbe | 320 | struct padata_parallel_queue *pqueue; |
16295bec | 321 | struct parallel_data *pd; |
350ef88e | 322 | int reorder_via_wq = 0; |
16295bec SK |
323 | |
324 | pd = padata->pd; | |
325 | ||
326 | cpu = get_cpu(); | |
350ef88e | 327 | |
6fc4dbcf HX |
328 | /* We need to enqueue the padata object into the correct |
329 | * per-cpu queue. | |
350ef88e MK |
330 | */ |
331 | if (cpu != padata->cpu) { | |
332 | reorder_via_wq = 1; | |
333 | cpu = padata->cpu; | |
334 | } | |
335 | ||
e15bacbe | 336 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec | 337 | |
e15bacbe | 338 | spin_lock(&pqueue->reorder.lock); |
e15bacbe | 339 | list_add_tail(&padata->list, &pqueue->reorder.list); |
6fc4dbcf | 340 | atomic_inc(&pd->reorder_objects); |
e15bacbe | 341 | spin_unlock(&pqueue->reorder.lock); |
16295bec | 342 | |
cf144f81 | 343 | /* |
6fc4dbcf | 344 | * Ensure the addition to the reorder list is ordered correctly |
cf144f81 DJ |
345 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb |
346 | * in padata_reorder. | |
347 | */ | |
348 | smp_mb__after_atomic(); | |
349 | ||
16295bec SK |
350 | put_cpu(); |
351 | ||
6fc4dbcf | 352 | padata_reorder(pd); |
16295bec SK |
353 | } |
354 | EXPORT_SYMBOL(padata_do_serial); | |
355 | ||
e15bacbe DK |
356 | static int padata_setup_cpumasks(struct parallel_data *pd, |
357 | const struct cpumask *pcpumask, | |
358 | const struct cpumask *cbcpumask) | |
16295bec | 359 | { |
e15bacbe DK |
360 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
361 | return -ENOMEM; | |
16295bec | 362 | |
13614e0f | 363 | cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_online_mask); |
e15bacbe | 364 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) { |
07a77929 | 365 | free_cpumask_var(pd->cpumask.pcpu); |
e15bacbe DK |
366 | return -ENOMEM; |
367 | } | |
16295bec | 368 | |
13614e0f | 369 | cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_online_mask); |
e15bacbe DK |
370 | return 0; |
371 | } | |
16295bec | 372 | |
e15bacbe DK |
373 | static void __padata_list_init(struct padata_list *pd_list) |
374 | { | |
375 | INIT_LIST_HEAD(&pd_list->list); | |
376 | spin_lock_init(&pd_list->lock); | |
377 | } | |
16295bec | 378 | |
e15bacbe DK |
379 | /* Initialize all percpu queues used by serial workers */ |
380 | static void padata_init_squeues(struct parallel_data *pd) | |
381 | { | |
382 | int cpu; | |
383 | struct padata_serial_queue *squeue; | |
7b389b2c | 384 | |
e15bacbe DK |
385 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
386 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
387 | squeue->pd = pd; | |
388 | __padata_list_init(&squeue->serial); | |
389 | INIT_WORK(&squeue->work, padata_serial_worker); | |
390 | } | |
391 | } | |
16295bec | 392 | |
e15bacbe DK |
393 | /* Initialize all percpu queues used by parallel workers */ |
394 | static void padata_init_pqueues(struct parallel_data *pd) | |
395 | { | |
2dc9b5db | 396 | int cpu_index, cpu; |
e15bacbe | 397 | struct padata_parallel_queue *pqueue; |
16295bec | 398 | |
e15bacbe | 399 | cpu_index = 0; |
1bd845bc | 400 | for_each_possible_cpu(cpu) { |
e15bacbe | 401 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
1bd845bc MK |
402 | |
403 | if (!cpumask_test_cpu(cpu, pd->cpumask.pcpu)) { | |
404 | pqueue->cpu_index = -1; | |
405 | continue; | |
406 | } | |
407 | ||
e15bacbe | 408 | pqueue->cpu_index = cpu_index; |
7b389b2c | 409 | cpu_index++; |
16295bec | 410 | |
e15bacbe DK |
411 | __padata_list_init(&pqueue->reorder); |
412 | __padata_list_init(&pqueue->parallel); | |
413 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
414 | atomic_set(&pqueue->num_obj, 0); | |
16295bec | 415 | } |
e15bacbe | 416 | } |
16295bec | 417 | |
e15bacbe DK |
418 | /* Allocate and initialize the internal cpumask dependend resources. */ |
419 | static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, | |
420 | const struct cpumask *pcpumask, | |
421 | const struct cpumask *cbcpumask) | |
422 | { | |
423 | struct parallel_data *pd; | |
16295bec | 424 | |
e15bacbe DK |
425 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
426 | if (!pd) | |
427 | goto err; | |
16295bec | 428 | |
e15bacbe DK |
429 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
430 | if (!pd->pqueue) | |
431 | goto err_free_pd; | |
432 | ||
433 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
434 | if (!pd->squeue) | |
435 | goto err_free_pqueue; | |
436 | if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0) | |
437 | goto err_free_squeue; | |
16295bec | 438 | |
e15bacbe DK |
439 | padata_init_pqueues(pd); |
440 | padata_init_squeues(pd); | |
0b6b098e | 441 | atomic_set(&pd->seq_nr, -1); |
16295bec SK |
442 | atomic_set(&pd->reorder_objects, 0); |
443 | atomic_set(&pd->refcnt, 0); | |
444 | pd->pinst = pinst; | |
445 | spin_lock_init(&pd->lock); | |
6fc4dbcf HX |
446 | pd->cpu = cpumask_first(pcpumask); |
447 | INIT_WORK(&pd->reorder_work, invoke_padata_reorder); | |
16295bec SK |
448 | |
449 | return pd; | |
450 | ||
e15bacbe DK |
451 | err_free_squeue: |
452 | free_percpu(pd->squeue); | |
453 | err_free_pqueue: | |
454 | free_percpu(pd->pqueue); | |
16295bec SK |
455 | err_free_pd: |
456 | kfree(pd); | |
457 | err: | |
458 | return NULL; | |
459 | } | |
460 | ||
461 | static void padata_free_pd(struct parallel_data *pd) | |
462 | { | |
e15bacbe DK |
463 | free_cpumask_var(pd->cpumask.pcpu); |
464 | free_cpumask_var(pd->cpumask.cbcpu); | |
465 | free_percpu(pd->pqueue); | |
466 | free_percpu(pd->squeue); | |
16295bec SK |
467 | kfree(pd); |
468 | } | |
469 | ||
0198ffd1 | 470 | /* Flush all objects out of the padata queues. */ |
2b73b07a SK |
471 | static void padata_flush_queues(struct parallel_data *pd) |
472 | { | |
473 | int cpu; | |
e15bacbe DK |
474 | struct padata_parallel_queue *pqueue; |
475 | struct padata_serial_queue *squeue; | |
2b73b07a | 476 | |
e15bacbe DK |
477 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
478 | pqueue = per_cpu_ptr(pd->pqueue, cpu); | |
479 | flush_work(&pqueue->work); | |
2b73b07a SK |
480 | } |
481 | ||
2b73b07a SK |
482 | if (atomic_read(&pd->reorder_objects)) |
483 | padata_reorder(pd); | |
484 | ||
e15bacbe DK |
485 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
486 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
487 | flush_work(&squeue->work); | |
2b73b07a SK |
488 | } |
489 | ||
490 | BUG_ON(atomic_read(&pd->refcnt) != 0); | |
491 | } | |
492 | ||
4c879170 SK |
493 | static void __padata_start(struct padata_instance *pinst) |
494 | { | |
495 | pinst->flags |= PADATA_INIT; | |
496 | } | |
497 | ||
ee836555 SK |
498 | static void __padata_stop(struct padata_instance *pinst) |
499 | { | |
500 | if (!(pinst->flags & PADATA_INIT)) | |
501 | return; | |
502 | ||
503 | pinst->flags &= ~PADATA_INIT; | |
504 | ||
505 | synchronize_rcu(); | |
506 | ||
507 | get_online_cpus(); | |
508 | padata_flush_queues(pinst->pd); | |
509 | put_online_cpus(); | |
510 | } | |
511 | ||
25985edc | 512 | /* Replace the internal control structure with a new one. */ |
16295bec SK |
513 | static void padata_replace(struct padata_instance *pinst, |
514 | struct parallel_data *pd_new) | |
515 | { | |
516 | struct parallel_data *pd_old = pinst->pd; | |
e15bacbe | 517 | int notification_mask = 0; |
16295bec SK |
518 | |
519 | pinst->flags |= PADATA_RESET; | |
520 | ||
521 | rcu_assign_pointer(pinst->pd, pd_new); | |
522 | ||
523 | synchronize_rcu(); | |
524 | ||
e15bacbe DK |
525 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) |
526 | notification_mask |= PADATA_CPU_PARALLEL; | |
527 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) | |
528 | notification_mask |= PADATA_CPU_SERIAL; | |
529 | ||
2b73b07a | 530 | padata_flush_queues(pd_old); |
16295bec SK |
531 | padata_free_pd(pd_old); |
532 | ||
e15bacbe DK |
533 | if (notification_mask) |
534 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
c635696c SK |
535 | notification_mask, |
536 | &pd_new->cpumask); | |
16295bec SK |
537 | |
538 | pinst->flags &= ~PADATA_RESET; | |
539 | } | |
540 | ||
0198ffd1 | 541 | /** |
e15bacbe DK |
542 | * padata_register_cpumask_notifier - Registers a notifier that will be called |
543 | * if either pcpu or cbcpu or both cpumasks change. | |
16295bec | 544 | * |
e15bacbe DK |
545 | * @pinst: A poineter to padata instance |
546 | * @nblock: A pointer to notifier block. | |
16295bec | 547 | */ |
e15bacbe DK |
548 | int padata_register_cpumask_notifier(struct padata_instance *pinst, |
549 | struct notifier_block *nblock) | |
16295bec | 550 | { |
e15bacbe DK |
551 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, |
552 | nblock); | |
553 | } | |
554 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
555 | ||
556 | /** | |
557 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
558 | * registered earlier using padata_register_cpumask_notifier | |
559 | * | |
560 | * @pinst: A pointer to data instance. | |
561 | * @nlock: A pointer to notifier block. | |
562 | */ | |
563 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
564 | struct notifier_block *nblock) | |
565 | { | |
566 | return blocking_notifier_chain_unregister( | |
567 | &pinst->cpumask_change_notifier, | |
568 | nblock); | |
569 | } | |
570 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
571 | ||
572 | ||
33e54450 SK |
573 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
574 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
575 | const struct cpumask *cpumask) | |
576 | { | |
13614e0f | 577 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
578 | pinst->flags |= PADATA_INVALID; |
579 | return false; | |
580 | } | |
581 | ||
582 | pinst->flags &= ~PADATA_INVALID; | |
583 | return true; | |
584 | } | |
585 | ||
65ff577e SK |
586 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
587 | cpumask_var_t pcpumask, | |
588 | cpumask_var_t cbcpumask) | |
589 | { | |
590 | int valid; | |
16295bec | 591 | struct parallel_data *pd; |
65ff577e SK |
592 | |
593 | valid = padata_validate_cpumask(pinst, pcpumask); | |
594 | if (!valid) { | |
595 | __padata_stop(pinst); | |
596 | goto out_replace; | |
597 | } | |
598 | ||
599 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
600 | if (!valid) | |
601 | __padata_stop(pinst); | |
602 | ||
603 | out_replace: | |
604 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); | |
605 | if (!pd) | |
606 | return -ENOMEM; | |
607 | ||
608 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); | |
609 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
610 | ||
611 | padata_replace(pinst, pd); | |
612 | ||
613 | if (valid) | |
614 | __padata_start(pinst); | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
e15bacbe DK |
619 | /** |
620 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
621 | * equivalent to @cpumask. | |
16295bec SK |
622 | * |
623 | * @pinst: padata instance | |
e15bacbe DK |
624 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
625 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
626 | * @cpumask: the cpumask to use |
627 | */ | |
e15bacbe DK |
628 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
629 | cpumask_var_t cpumask) | |
630 | { | |
631 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
632 | int err = -EINVAL; |
633 | ||
634 | mutex_lock(&pinst->lock); | |
6751fb3c SK |
635 | get_online_cpus(); |
636 | ||
e15bacbe DK |
637 | switch (cpumask_type) { |
638 | case PADATA_CPU_PARALLEL: | |
639 | serial_mask = pinst->cpumask.cbcpu; | |
640 | parallel_mask = cpumask; | |
641 | break; | |
642 | case PADATA_CPU_SERIAL: | |
643 | parallel_mask = pinst->cpumask.pcpu; | |
644 | serial_mask = cpumask; | |
645 | break; | |
646 | default: | |
65ff577e | 647 | goto out; |
16295bec SK |
648 | } |
649 | ||
65ff577e | 650 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
651 | |
652 | out: | |
6751fb3c | 653 | put_online_cpus(); |
16295bec SK |
654 | mutex_unlock(&pinst->lock); |
655 | ||
656 | return err; | |
657 | } | |
658 | EXPORT_SYMBOL(padata_set_cpumask); | |
659 | ||
19d795b6 AB |
660 | /** |
661 | * padata_start - start the parallel processing | |
662 | * | |
663 | * @pinst: padata instance to start | |
664 | */ | |
665 | int padata_start(struct padata_instance *pinst) | |
666 | { | |
667 | int err = 0; | |
668 | ||
669 | mutex_lock(&pinst->lock); | |
670 | ||
671 | if (pinst->flags & PADATA_INVALID) | |
672 | err = -EINVAL; | |
673 | ||
8ddab428 | 674 | __padata_start(pinst); |
19d795b6 AB |
675 | |
676 | mutex_unlock(&pinst->lock); | |
677 | ||
678 | return err; | |
679 | } | |
680 | EXPORT_SYMBOL(padata_start); | |
681 | ||
682 | /** | |
683 | * padata_stop - stop the parallel processing | |
684 | * | |
685 | * @pinst: padata instance to stop | |
686 | */ | |
687 | void padata_stop(struct padata_instance *pinst) | |
688 | { | |
689 | mutex_lock(&pinst->lock); | |
690 | __padata_stop(pinst); | |
691 | mutex_unlock(&pinst->lock); | |
692 | } | |
693 | EXPORT_SYMBOL(padata_stop); | |
694 | ||
695 | #ifdef CONFIG_HOTPLUG_CPU | |
696 | ||
16295bec SK |
697 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
698 | { | |
699 | struct parallel_data *pd; | |
700 | ||
13614e0f | 701 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe DK |
702 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
703 | pinst->cpumask.cbcpu); | |
16295bec SK |
704 | if (!pd) |
705 | return -ENOMEM; | |
706 | ||
707 | padata_replace(pinst, pd); | |
33e54450 | 708 | |
e15bacbe DK |
709 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
710 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 711 | __padata_start(pinst); |
16295bec SK |
712 | } |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
16295bec SK |
717 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
718 | { | |
33e54450 | 719 | struct parallel_data *pd = NULL; |
16295bec SK |
720 | |
721 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { | |
33e54450 | 722 | |
e15bacbe | 723 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 724 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 725 | __padata_stop(pinst); |
33e54450 | 726 | |
e15bacbe DK |
727 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
728 | pinst->cpumask.cbcpu); | |
16295bec SK |
729 | if (!pd) |
730 | return -ENOMEM; | |
731 | ||
732 | padata_replace(pinst, pd); | |
96120905 SK |
733 | |
734 | cpumask_clear_cpu(cpu, pd->cpumask.cbcpu); | |
735 | cpumask_clear_cpu(cpu, pd->cpumask.pcpu); | |
16295bec SK |
736 | } |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
e15bacbe | 741 | /** |
25985edc | 742 | * padata_remove_cpu - remove a cpu from the one or both(serial and parallel) |
e15bacbe | 743 | * padata cpumasks. |
16295bec SK |
744 | * |
745 | * @pinst: padata instance | |
746 | * @cpu: cpu to remove | |
e15bacbe DK |
747 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
748 | * The @mask may be any combination of the following flags: | |
749 | * PADATA_CPU_SERIAL - serial cpumask | |
750 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 751 | */ |
e15bacbe | 752 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
753 | { |
754 | int err; | |
755 | ||
e15bacbe DK |
756 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
757 | return -EINVAL; | |
758 | ||
16295bec SK |
759 | mutex_lock(&pinst->lock); |
760 | ||
6751fb3c | 761 | get_online_cpus(); |
e15bacbe DK |
762 | if (mask & PADATA_CPU_SERIAL) |
763 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
764 | if (mask & PADATA_CPU_PARALLEL) | |
765 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
766 | ||
16295bec | 767 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 768 | put_online_cpus(); |
16295bec SK |
769 | |
770 | mutex_unlock(&pinst->lock); | |
771 | ||
772 | return err; | |
773 | } | |
774 | EXPORT_SYMBOL(padata_remove_cpu); | |
775 | ||
e15bacbe DK |
776 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
777 | { | |
778 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
779 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
780 | } | |
781 | ||
30e92153 | 782 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 783 | { |
16295bec | 784 | struct padata_instance *pinst; |
30e92153 | 785 | int ret; |
16295bec | 786 | |
30e92153 SAS |
787 | pinst = hlist_entry_safe(node, struct padata_instance, node); |
788 | if (!pinst_has_cpu(pinst, cpu)) | |
789 | return 0; | |
16295bec | 790 | |
30e92153 SAS |
791 | mutex_lock(&pinst->lock); |
792 | ret = __padata_add_cpu(pinst, cpu); | |
793 | mutex_unlock(&pinst->lock); | |
794 | return ret; | |
795 | } | |
16295bec | 796 | |
30e92153 SAS |
797 | static int padata_cpu_prep_down(unsigned int cpu, struct hlist_node *node) |
798 | { | |
799 | struct padata_instance *pinst; | |
800 | int ret; | |
801 | ||
802 | pinst = hlist_entry_safe(node, struct padata_instance, node); | |
803 | if (!pinst_has_cpu(pinst, cpu)) | |
804 | return 0; | |
16295bec | 805 | |
30e92153 SAS |
806 | mutex_lock(&pinst->lock); |
807 | ret = __padata_remove_cpu(pinst, cpu); | |
808 | mutex_unlock(&pinst->lock); | |
809 | return ret; | |
16295bec | 810 | } |
30e92153 SAS |
811 | |
812 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 813 | #endif |
16295bec | 814 | |
5e017dc3 DK |
815 | static void __padata_free(struct padata_instance *pinst) |
816 | { | |
817 | #ifdef CONFIG_HOTPLUG_CPU | |
30e92153 | 818 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node); |
5e017dc3 DK |
819 | #endif |
820 | ||
821 | padata_stop(pinst); | |
822 | padata_free_pd(pinst->pd); | |
823 | free_cpumask_var(pinst->cpumask.pcpu); | |
824 | free_cpumask_var(pinst->cpumask.cbcpu); | |
825 | kfree(pinst); | |
826 | } | |
827 | ||
828 | #define kobj2pinst(_kobj) \ | |
829 | container_of(_kobj, struct padata_instance, kobj) | |
830 | #define attr2pentry(_attr) \ | |
831 | container_of(_attr, struct padata_sysfs_entry, attr) | |
832 | ||
833 | static void padata_sysfs_release(struct kobject *kobj) | |
834 | { | |
835 | struct padata_instance *pinst = kobj2pinst(kobj); | |
836 | __padata_free(pinst); | |
837 | } | |
838 | ||
839 | struct padata_sysfs_entry { | |
840 | struct attribute attr; | |
841 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
842 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
843 | const char *, size_t); | |
844 | }; | |
845 | ||
846 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
847 | struct attribute *attr, char *buf) | |
848 | { | |
849 | struct cpumask *cpumask; | |
850 | ssize_t len; | |
851 | ||
852 | mutex_lock(&pinst->lock); | |
853 | if (!strcmp(attr->name, "serial_cpumask")) | |
854 | cpumask = pinst->cpumask.cbcpu; | |
855 | else | |
856 | cpumask = pinst->cpumask.pcpu; | |
857 | ||
4497da6f TH |
858 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
859 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 860 | mutex_unlock(&pinst->lock); |
4497da6f | 861 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
862 | } |
863 | ||
864 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
865 | struct attribute *attr, | |
866 | const char *buf, size_t count) | |
867 | { | |
868 | cpumask_var_t new_cpumask; | |
869 | ssize_t ret; | |
870 | int mask_type; | |
871 | ||
872 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
873 | return -ENOMEM; | |
874 | ||
875 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
876 | nr_cpumask_bits); | |
877 | if (ret < 0) | |
878 | goto out; | |
879 | ||
880 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
881 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
882 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
883 | if (!ret) | |
884 | ret = count; | |
885 | ||
886 | out: | |
887 | free_cpumask_var(new_cpumask); | |
888 | return ret; | |
889 | } | |
890 | ||
891 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
892 | static struct padata_sysfs_entry _name##_attr = \ | |
893 | __ATTR(_name, 0644, _show_name, _store_name) | |
894 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
895 | static struct padata_sysfs_entry _name##_attr = \ | |
896 | __ATTR(_name, 0400, _show_name, NULL) | |
897 | ||
898 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
899 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
900 | ||
901 | /* | |
902 | * Padata sysfs provides the following objects: | |
903 | * serial_cpumask [RW] - cpumask for serial workers | |
904 | * parallel_cpumask [RW] - cpumask for parallel workers | |
905 | */ | |
906 | static struct attribute *padata_default_attrs[] = { | |
907 | &serial_cpumask_attr.attr, | |
908 | ¶llel_cpumask_attr.attr, | |
909 | NULL, | |
910 | }; | |
2064fbc7 | 911 | ATTRIBUTE_GROUPS(padata_default); |
5e017dc3 DK |
912 | |
913 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
914 | struct attribute *attr, char *buf) | |
915 | { | |
916 | struct padata_instance *pinst; | |
917 | struct padata_sysfs_entry *pentry; | |
918 | ssize_t ret = -EIO; | |
919 | ||
920 | pinst = kobj2pinst(kobj); | |
921 | pentry = attr2pentry(attr); | |
922 | if (pentry->show) | |
923 | ret = pentry->show(pinst, attr, buf); | |
924 | ||
925 | return ret; | |
926 | } | |
927 | ||
928 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
929 | const char *buf, size_t count) | |
930 | { | |
931 | struct padata_instance *pinst; | |
932 | struct padata_sysfs_entry *pentry; | |
933 | ssize_t ret = -EIO; | |
934 | ||
935 | pinst = kobj2pinst(kobj); | |
936 | pentry = attr2pentry(attr); | |
937 | if (pentry->show) | |
938 | ret = pentry->store(pinst, attr, buf, count); | |
939 | ||
940 | return ret; | |
941 | } | |
942 | ||
943 | static const struct sysfs_ops padata_sysfs_ops = { | |
944 | .show = padata_sysfs_show, | |
945 | .store = padata_sysfs_store, | |
946 | }; | |
947 | ||
948 | static struct kobj_type padata_attr_type = { | |
949 | .sysfs_ops = &padata_sysfs_ops, | |
2064fbc7 | 950 | .default_groups = padata_default_groups, |
5e017dc3 DK |
951 | .release = padata_sysfs_release, |
952 | }; | |
953 | ||
e15bacbe | 954 | /** |
e6cc1170 SK |
955 | * padata_alloc - allocate and initialize a padata instance and specify |
956 | * cpumasks for serial and parallel workers. | |
16295bec | 957 | * |
16295bec | 958 | * @wq: workqueue to use for the allocated padata instance |
e15bacbe DK |
959 | * @pcpumask: cpumask that will be used for padata parallelization |
960 | * @cbcpumask: cpumask that will be used for padata serialization | |
c5a81c8f SAS |
961 | * |
962 | * Must be called from a cpus_read_lock() protected region | |
16295bec | 963 | */ |
9596695e TG |
964 | static struct padata_instance *padata_alloc(struct workqueue_struct *wq, |
965 | const struct cpumask *pcpumask, | |
966 | const struct cpumask *cbcpumask) | |
16295bec | 967 | { |
16295bec | 968 | struct padata_instance *pinst; |
33e54450 | 969 | struct parallel_data *pd = NULL; |
16295bec SK |
970 | |
971 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
972 | if (!pinst) | |
973 | goto err; | |
974 | ||
e15bacbe | 975 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) |
16295bec | 976 | goto err_free_inst; |
e15bacbe DK |
977 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
978 | free_cpumask_var(pinst->cpumask.pcpu); | |
16295bec | 979 | goto err_free_inst; |
33e54450 | 980 | } |
e15bacbe DK |
981 | if (!padata_validate_cpumask(pinst, pcpumask) || |
982 | !padata_validate_cpumask(pinst, cbcpumask)) | |
983 | goto err_free_masks; | |
16295bec | 984 | |
e15bacbe DK |
985 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
986 | if (!pd) | |
987 | goto err_free_masks; | |
74781387 | 988 | |
16295bec SK |
989 | rcu_assign_pointer(pinst->pd, pd); |
990 | ||
991 | pinst->wq = wq; | |
992 | ||
e15bacbe DK |
993 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
994 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
995 | |
996 | pinst->flags = 0; | |
997 | ||
e15bacbe | 998 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 999 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1000 | mutex_init(&pinst->lock); |
1001 | ||
b8b4a416 | 1002 | #ifdef CONFIG_HOTPLUG_CPU |
c5a81c8f | 1003 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node); |
b8b4a416 | 1004 | #endif |
16295bec SK |
1005 | return pinst; |
1006 | ||
e15bacbe DK |
1007 | err_free_masks: |
1008 | free_cpumask_var(pinst->cpumask.pcpu); | |
1009 | free_cpumask_var(pinst->cpumask.cbcpu); | |
16295bec SK |
1010 | err_free_inst: |
1011 | kfree(pinst); | |
1012 | err: | |
1013 | return NULL; | |
1014 | } | |
16295bec | 1015 | |
9596695e TG |
1016 | /** |
1017 | * padata_alloc_possible - Allocate and initialize padata instance. | |
1018 | * Use the cpu_possible_mask for serial and | |
1019 | * parallel workers. | |
1020 | * | |
1021 | * @wq: workqueue to use for the allocated padata instance | |
c5a81c8f SAS |
1022 | * |
1023 | * Must be called from a cpus_read_lock() protected region | |
9596695e TG |
1024 | */ |
1025 | struct padata_instance *padata_alloc_possible(struct workqueue_struct *wq) | |
1026 | { | |
c5a81c8f | 1027 | lockdep_assert_cpus_held(); |
9596695e TG |
1028 | return padata_alloc(wq, cpu_possible_mask, cpu_possible_mask); |
1029 | } | |
1030 | EXPORT_SYMBOL(padata_alloc_possible); | |
1031 | ||
0198ffd1 | 1032 | /** |
16295bec SK |
1033 | * padata_free - free a padata instance |
1034 | * | |
0198ffd1 | 1035 | * @padata_inst: padata instance to free |
16295bec SK |
1036 | */ |
1037 | void padata_free(struct padata_instance *pinst) | |
1038 | { | |
5e017dc3 | 1039 | kobject_put(&pinst->kobj); |
16295bec SK |
1040 | } |
1041 | EXPORT_SYMBOL(padata_free); | |
30e92153 SAS |
1042 | |
1043 | #ifdef CONFIG_HOTPLUG_CPU | |
1044 | ||
1045 | static __init int padata_driver_init(void) | |
1046 | { | |
1047 | int ret; | |
1048 | ||
1049 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", | |
1050 | padata_cpu_online, | |
1051 | padata_cpu_prep_down); | |
1052 | if (ret < 0) | |
1053 | return ret; | |
1054 | hp_online = ret; | |
1055 | return 0; | |
1056 | } | |
1057 | module_init(padata_driver_init); | |
1058 | ||
1059 | static __exit void padata_driver_exit(void) | |
1060 | { | |
1061 | cpuhp_remove_multi_state(hp_online); | |
1062 | } | |
1063 | module_exit(padata_driver_exit); | |
1064 | #endif |