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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 | 37 | |
07928d9b HX |
38 | static void padata_free_pd(struct parallel_data *pd); |
39 | ||
16295bec SK |
40 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) |
41 | { | |
42 | int cpu, target_cpu; | |
43 | ||
e15bacbe | 44 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
16295bec | 45 | for (cpu = 0; cpu < cpu_index; cpu++) |
e15bacbe | 46 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
16295bec SK |
47 | |
48 | return target_cpu; | |
49 | } | |
50 | ||
bfde23ce | 51 | static int padata_cpu_hash(struct parallel_data *pd, unsigned int seq_nr) |
16295bec | 52 | { |
16295bec SK |
53 | /* |
54 | * Hash the sequence numbers to the cpus by taking | |
55 | * seq_nr mod. number of cpus in use. | |
56 | */ | |
bfde23ce | 57 | int cpu_index = seq_nr % cpumask_weight(pd->cpumask.pcpu); |
16295bec SK |
58 | |
59 | return padata_index_to_cpu(pd, cpu_index); | |
60 | } | |
61 | ||
e15bacbe | 62 | static void padata_parallel_worker(struct work_struct *parallel_work) |
16295bec | 63 | { |
e15bacbe | 64 | struct padata_parallel_queue *pqueue; |
16295bec SK |
65 | LIST_HEAD(local_list); |
66 | ||
67 | local_bh_disable(); | |
e15bacbe DK |
68 | pqueue = container_of(parallel_work, |
69 | struct padata_parallel_queue, work); | |
16295bec | 70 | |
e15bacbe DK |
71 | spin_lock(&pqueue->parallel.lock); |
72 | list_replace_init(&pqueue->parallel.list, &local_list); | |
73 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
74 | |
75 | while (!list_empty(&local_list)) { | |
76 | struct padata_priv *padata; | |
77 | ||
78 | padata = list_entry(local_list.next, | |
79 | struct padata_priv, list); | |
80 | ||
81 | list_del_init(&padata->list); | |
82 | ||
83 | padata->parallel(padata); | |
84 | } | |
85 | ||
86 | local_bh_enable(); | |
87 | } | |
88 | ||
0198ffd1 | 89 | /** |
16295bec SK |
90 | * padata_do_parallel - padata parallelization function |
91 | * | |
bbefa1dd | 92 | * @ps: padatashell |
16295bec | 93 | * @padata: object to be parallelized |
e6ce0e08 DJ |
94 | * @cb_cpu: pointer to the CPU that the serialization callback function should |
95 | * run on. If it's not in the serial cpumask of @pinst | |
96 | * (i.e. cpumask.cbcpu), this function selects a fallback CPU and if | |
97 | * none found, returns -EINVAL. | |
16295bec SK |
98 | * |
99 | * The parallelization callback function will run with BHs off. | |
100 | * Note: Every object which is parallelized by padata_do_parallel | |
101 | * must be seen by padata_do_serial. | |
102 | */ | |
bbefa1dd | 103 | int padata_do_parallel(struct padata_shell *ps, |
e6ce0e08 | 104 | struct padata_priv *padata, int *cb_cpu) |
16295bec | 105 | { |
bbefa1dd | 106 | struct padata_instance *pinst = ps->pinst; |
e6ce0e08 | 107 | int i, cpu, cpu_index, target_cpu, err; |
e15bacbe | 108 | struct padata_parallel_queue *queue; |
16295bec SK |
109 | struct parallel_data *pd; |
110 | ||
111 | rcu_read_lock_bh(); | |
112 | ||
bbefa1dd | 113 | pd = rcu_dereference_bh(ps->pd); |
16295bec | 114 | |
83f619f3 | 115 | err = -EINVAL; |
7424713b | 116 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
117 | goto out; |
118 | ||
e6ce0e08 DJ |
119 | if (!cpumask_test_cpu(*cb_cpu, pd->cpumask.cbcpu)) { |
120 | if (!cpumask_weight(pd->cpumask.cbcpu)) | |
121 | goto out; | |
122 | ||
123 | /* Select an alternate fallback CPU and notify the caller. */ | |
124 | cpu_index = *cb_cpu % cpumask_weight(pd->cpumask.cbcpu); | |
125 | ||
126 | cpu = cpumask_first(pd->cpumask.cbcpu); | |
127 | for (i = 0; i < cpu_index; i++) | |
128 | cpu = cpumask_next(cpu, pd->cpumask.cbcpu); | |
129 | ||
130 | *cb_cpu = cpu; | |
131 | } | |
16295bec SK |
132 | |
133 | err = -EBUSY; | |
134 | if ((pinst->flags & PADATA_RESET)) | |
135 | goto out; | |
136 | ||
137 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
138 | goto out; | |
139 | ||
83f619f3 | 140 | err = 0; |
16295bec SK |
141 | atomic_inc(&pd->refcnt); |
142 | padata->pd = pd; | |
e6ce0e08 | 143 | padata->cb_cpu = *cb_cpu; |
16295bec | 144 | |
bfde23ce DJ |
145 | padata->seq_nr = atomic_inc_return(&pd->seq_nr); |
146 | target_cpu = padata_cpu_hash(pd, padata->seq_nr); | |
350ef88e | 147 | padata->cpu = target_cpu; |
e15bacbe | 148 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
149 | |
150 | spin_lock(&queue->parallel.lock); | |
151 | list_add_tail(&padata->list, &queue->parallel.list); | |
152 | spin_unlock(&queue->parallel.lock); | |
153 | ||
bfde23ce | 154 | queue_work(pinst->parallel_wq, &queue->work); |
16295bec SK |
155 | |
156 | out: | |
157 | rcu_read_unlock_bh(); | |
158 | ||
159 | return err; | |
160 | } | |
161 | EXPORT_SYMBOL(padata_do_parallel); | |
162 | ||
0198ffd1 | 163 | /* |
bfde23ce | 164 | * padata_find_next - Find the next object that needs serialization. |
0198ffd1 SK |
165 | * |
166 | * Return values are: | |
167 | * | |
168 | * A pointer to the control struct of the next object that needs | |
169 | * serialization, if present in one of the percpu reorder queues. | |
170 | * | |
bfde23ce | 171 | * NULL, if the next object that needs serialization will |
0198ffd1 SK |
172 | * be parallel processed by another cpu and is not yet present in |
173 | * the cpu's reorder queue. | |
0198ffd1 | 174 | */ |
bfde23ce DJ |
175 | static struct padata_priv *padata_find_next(struct parallel_data *pd, |
176 | bool remove_object) | |
16295bec | 177 | { |
f0fcf200 | 178 | struct padata_parallel_queue *next_queue; |
16295bec SK |
179 | struct padata_priv *padata; |
180 | struct padata_list *reorder; | |
6fc4dbcf | 181 | int cpu = pd->cpu; |
16295bec | 182 | |
e15bacbe | 183 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec SK |
184 | reorder = &next_queue->reorder; |
185 | ||
de5540d0 | 186 | spin_lock(&reorder->lock); |
bfde23ce DJ |
187 | if (list_empty(&reorder->list)) { |
188 | spin_unlock(&reorder->lock); | |
189 | return NULL; | |
190 | } | |
16295bec | 191 | |
bfde23ce | 192 | padata = list_entry(reorder->list.next, struct padata_priv, list); |
16295bec | 193 | |
bfde23ce DJ |
194 | /* |
195 | * Checks the rare case where two or more parallel jobs have hashed to | |
196 | * the same CPU and one of the later ones finishes first. | |
197 | */ | |
198 | if (padata->seq_nr != pd->processed) { | |
de5540d0 | 199 | spin_unlock(&reorder->lock); |
bfde23ce | 200 | return NULL; |
16295bec SK |
201 | } |
202 | ||
bfde23ce DJ |
203 | if (remove_object) { |
204 | list_del_init(&padata->list); | |
bfde23ce DJ |
205 | ++pd->processed; |
206 | pd->cpu = cpumask_next_wrap(cpu, pd->cpumask.pcpu, -1, false); | |
16295bec SK |
207 | } |
208 | ||
bfde23ce | 209 | spin_unlock(&reorder->lock); |
16295bec SK |
210 | return padata; |
211 | } | |
212 | ||
213 | static void padata_reorder(struct parallel_data *pd) | |
214 | { | |
bbefa1dd | 215 | struct padata_instance *pinst = pd->ps->pinst; |
3047817b | 216 | int cb_cpu; |
16295bec | 217 | struct padata_priv *padata; |
e15bacbe | 218 | struct padata_serial_queue *squeue; |
6fc4dbcf | 219 | struct padata_parallel_queue *next_queue; |
16295bec | 220 | |
0198ffd1 SK |
221 | /* |
222 | * We need to ensure that only one cpu can work on dequeueing of | |
223 | * the reorder queue the time. Calculating in which percpu reorder | |
224 | * queue the next object will arrive takes some time. A spinlock | |
225 | * would be highly contended. Also it is not clear in which order | |
226 | * the objects arrive to the reorder queues. So a cpu could wait to | |
227 | * get the lock just to notice that there is nothing to do at the | |
228 | * moment. Therefore we use a trylock and let the holder of the lock | |
229 | * care for all the objects enqueued during the holdtime of the lock. | |
230 | */ | |
16295bec | 231 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 232 | return; |
16295bec SK |
233 | |
234 | while (1) { | |
bfde23ce | 235 | padata = padata_find_next(pd, true); |
16295bec | 236 | |
0198ffd1 | 237 | /* |
69b34844 JD |
238 | * If the next object that needs serialization is parallel |
239 | * processed by another cpu and is still on it's way to the | |
240 | * cpu's reorder queue, nothing to do for now. | |
0198ffd1 | 241 | */ |
bfde23ce | 242 | if (!padata) |
16295bec SK |
243 | break; |
244 | ||
3047817b SK |
245 | cb_cpu = padata->cb_cpu; |
246 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 247 | |
e15bacbe DK |
248 | spin_lock(&squeue->serial.lock); |
249 | list_add_tail(&padata->list, &squeue->serial.list); | |
250 | spin_unlock(&squeue->serial.lock); | |
16295bec | 251 | |
45d153c0 | 252 | queue_work_on(cb_cpu, pinst->serial_wq, &squeue->work); |
16295bec SK |
253 | } |
254 | ||
255 | spin_unlock_bh(&pd->lock); | |
256 | ||
0198ffd1 SK |
257 | /* |
258 | * The next object that needs serialization might have arrived to | |
6fc4dbcf | 259 | * the reorder queues in the meantime. |
cf144f81 | 260 | * |
6fc4dbcf HX |
261 | * Ensure reorder queue is read after pd->lock is dropped so we see |
262 | * new objects from another task in padata_do_serial. Pairs with | |
cf144f81 | 263 | * smp_mb__after_atomic in padata_do_serial. |
0198ffd1 | 264 | */ |
cf144f81 | 265 | smp_mb(); |
16295bec | 266 | |
6fc4dbcf | 267 | next_queue = per_cpu_ptr(pd->pqueue, pd->cpu); |
bfde23ce DJ |
268 | if (!list_empty(&next_queue->reorder.list) && |
269 | padata_find_next(pd, false)) | |
45d153c0 | 270 | queue_work(pinst->serial_wq, &pd->reorder_work); |
16295bec SK |
271 | } |
272 | ||
cf5868c8 MK |
273 | static void invoke_padata_reorder(struct work_struct *work) |
274 | { | |
cf5868c8 MK |
275 | struct parallel_data *pd; |
276 | ||
277 | local_bh_disable(); | |
6fc4dbcf | 278 | pd = container_of(work, struct parallel_data, reorder_work); |
cf5868c8 MK |
279 | padata_reorder(pd); |
280 | local_bh_enable(); | |
281 | } | |
282 | ||
e15bacbe | 283 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 284 | { |
e15bacbe | 285 | struct padata_serial_queue *squeue; |
16295bec SK |
286 | struct parallel_data *pd; |
287 | LIST_HEAD(local_list); | |
07928d9b | 288 | int cnt; |
16295bec SK |
289 | |
290 | local_bh_disable(); | |
e15bacbe DK |
291 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
292 | pd = squeue->pd; | |
16295bec | 293 | |
e15bacbe DK |
294 | spin_lock(&squeue->serial.lock); |
295 | list_replace_init(&squeue->serial.list, &local_list); | |
296 | spin_unlock(&squeue->serial.lock); | |
16295bec | 297 | |
07928d9b HX |
298 | cnt = 0; |
299 | ||
16295bec SK |
300 | while (!list_empty(&local_list)) { |
301 | struct padata_priv *padata; | |
302 | ||
303 | padata = list_entry(local_list.next, | |
304 | struct padata_priv, list); | |
305 | ||
306 | list_del_init(&padata->list); | |
307 | ||
308 | padata->serial(padata); | |
07928d9b | 309 | cnt++; |
16295bec SK |
310 | } |
311 | local_bh_enable(); | |
07928d9b HX |
312 | |
313 | if (atomic_sub_and_test(cnt, &pd->refcnt)) | |
314 | padata_free_pd(pd); | |
16295bec SK |
315 | } |
316 | ||
0198ffd1 | 317 | /** |
16295bec SK |
318 | * padata_do_serial - padata serialization function |
319 | * | |
320 | * @padata: object to be serialized. | |
321 | * | |
322 | * padata_do_serial must be called for every parallelized object. | |
323 | * The serialization callback function will run with BHs off. | |
324 | */ | |
325 | void padata_do_serial(struct padata_priv *padata) | |
326 | { | |
065cf577 DJ |
327 | struct parallel_data *pd = padata->pd; |
328 | struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue, | |
329 | padata->cpu); | |
bfde23ce | 330 | struct padata_priv *cur; |
16295bec | 331 | |
e15bacbe | 332 | spin_lock(&pqueue->reorder.lock); |
bfde23ce DJ |
333 | /* Sort in ascending order of sequence number. */ |
334 | list_for_each_entry_reverse(cur, &pqueue->reorder.list, list) | |
335 | if (cur->seq_nr < padata->seq_nr) | |
336 | break; | |
337 | list_add(&padata->list, &cur->list); | |
e15bacbe | 338 | spin_unlock(&pqueue->reorder.lock); |
16295bec | 339 | |
cf144f81 | 340 | /* |
6fc4dbcf | 341 | * Ensure the addition to the reorder list is ordered correctly |
cf144f81 DJ |
342 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb |
343 | * in padata_reorder. | |
344 | */ | |
345 | smp_mb__after_atomic(); | |
346 | ||
6fc4dbcf | 347 | padata_reorder(pd); |
16295bec SK |
348 | } |
349 | EXPORT_SYMBOL(padata_do_serial); | |
350 | ||
bbefa1dd | 351 | static int padata_setup_cpumasks(struct padata_instance *pinst) |
16295bec | 352 | { |
bfde23ce | 353 | struct workqueue_attrs *attrs; |
bbefa1dd HX |
354 | int err; |
355 | ||
356 | attrs = alloc_workqueue_attrs(); | |
357 | if (!attrs) | |
358 | return -ENOMEM; | |
359 | ||
360 | /* Restrict parallel_wq workers to pd->cpumask.pcpu. */ | |
361 | cpumask_copy(attrs->cpumask, pinst->cpumask.pcpu); | |
362 | err = apply_workqueue_attrs(pinst->parallel_wq, attrs); | |
363 | free_workqueue_attrs(attrs); | |
364 | ||
365 | return err; | |
366 | } | |
367 | ||
368 | static int pd_setup_cpumasks(struct parallel_data *pd, | |
369 | const struct cpumask *pcpumask, | |
370 | const struct cpumask *cbcpumask) | |
371 | { | |
bfde23ce | 372 | int err = -ENOMEM; |
16295bec | 373 | |
bfde23ce DJ |
374 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
375 | goto out; | |
bfde23ce DJ |
376 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) |
377 | goto free_pcpu_mask; | |
bfde23ce | 378 | |
bbefa1dd HX |
379 | cpumask_copy(pd->cpumask.pcpu, pcpumask); |
380 | cpumask_copy(pd->cpumask.cbcpu, cbcpumask); | |
bfde23ce | 381 | |
e15bacbe | 382 | return 0; |
bfde23ce | 383 | |
bfde23ce DJ |
384 | free_pcpu_mask: |
385 | free_cpumask_var(pd->cpumask.pcpu); | |
386 | out: | |
387 | return err; | |
e15bacbe | 388 | } |
16295bec | 389 | |
e15bacbe DK |
390 | static void __padata_list_init(struct padata_list *pd_list) |
391 | { | |
392 | INIT_LIST_HEAD(&pd_list->list); | |
393 | spin_lock_init(&pd_list->lock); | |
394 | } | |
16295bec | 395 | |
e15bacbe DK |
396 | /* Initialize all percpu queues used by serial workers */ |
397 | static void padata_init_squeues(struct parallel_data *pd) | |
398 | { | |
399 | int cpu; | |
400 | struct padata_serial_queue *squeue; | |
7b389b2c | 401 | |
e15bacbe DK |
402 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
403 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
404 | squeue->pd = pd; | |
405 | __padata_list_init(&squeue->serial); | |
406 | INIT_WORK(&squeue->work, padata_serial_worker); | |
407 | } | |
408 | } | |
16295bec | 409 | |
e15bacbe DK |
410 | /* Initialize all percpu queues used by parallel workers */ |
411 | static void padata_init_pqueues(struct parallel_data *pd) | |
412 | { | |
c51636a3 | 413 | int cpu; |
e15bacbe | 414 | struct padata_parallel_queue *pqueue; |
16295bec | 415 | |
c51636a3 | 416 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
e15bacbe | 417 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
1bd845bc | 418 | |
e15bacbe DK |
419 | __padata_list_init(&pqueue->reorder); |
420 | __padata_list_init(&pqueue->parallel); | |
421 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
422 | atomic_set(&pqueue->num_obj, 0); | |
16295bec | 423 | } |
e15bacbe | 424 | } |
16295bec | 425 | |
e15bacbe | 426 | /* Allocate and initialize the internal cpumask dependend resources. */ |
bbefa1dd | 427 | static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) |
e15bacbe | 428 | { |
bbefa1dd HX |
429 | struct padata_instance *pinst = ps->pinst; |
430 | const struct cpumask *cbcpumask; | |
431 | const struct cpumask *pcpumask; | |
e15bacbe | 432 | struct parallel_data *pd; |
16295bec | 433 | |
bbefa1dd HX |
434 | cbcpumask = pinst->rcpumask.cbcpu; |
435 | pcpumask = pinst->rcpumask.pcpu; | |
436 | ||
e15bacbe DK |
437 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
438 | if (!pd) | |
439 | goto err; | |
16295bec | 440 | |
e15bacbe DK |
441 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
442 | if (!pd->pqueue) | |
443 | goto err_free_pd; | |
444 | ||
445 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
446 | if (!pd->squeue) | |
447 | goto err_free_pqueue; | |
bfde23ce | 448 | |
bbefa1dd HX |
449 | pd->ps = ps; |
450 | if (pd_setup_cpumasks(pd, pcpumask, cbcpumask)) | |
e15bacbe | 451 | goto err_free_squeue; |
16295bec | 452 | |
e15bacbe DK |
453 | padata_init_pqueues(pd); |
454 | padata_init_squeues(pd); | |
0b6b098e | 455 | atomic_set(&pd->seq_nr, -1); |
07928d9b | 456 | atomic_set(&pd->refcnt, 1); |
16295bec | 457 | spin_lock_init(&pd->lock); |
ec9c7d19 | 458 | pd->cpu = cpumask_first(pd->cpumask.pcpu); |
6fc4dbcf | 459 | INIT_WORK(&pd->reorder_work, invoke_padata_reorder); |
16295bec SK |
460 | |
461 | return pd; | |
462 | ||
e15bacbe DK |
463 | err_free_squeue: |
464 | free_percpu(pd->squeue); | |
465 | err_free_pqueue: | |
466 | free_percpu(pd->pqueue); | |
16295bec SK |
467 | err_free_pd: |
468 | kfree(pd); | |
469 | err: | |
470 | return NULL; | |
471 | } | |
472 | ||
473 | static void padata_free_pd(struct parallel_data *pd) | |
474 | { | |
e15bacbe DK |
475 | free_cpumask_var(pd->cpumask.pcpu); |
476 | free_cpumask_var(pd->cpumask.cbcpu); | |
477 | free_percpu(pd->pqueue); | |
478 | free_percpu(pd->squeue); | |
16295bec SK |
479 | kfree(pd); |
480 | } | |
481 | ||
4c879170 SK |
482 | static void __padata_start(struct padata_instance *pinst) |
483 | { | |
484 | pinst->flags |= PADATA_INIT; | |
485 | } | |
486 | ||
ee836555 SK |
487 | static void __padata_stop(struct padata_instance *pinst) |
488 | { | |
489 | if (!(pinst->flags & PADATA_INIT)) | |
490 | return; | |
491 | ||
492 | pinst->flags &= ~PADATA_INIT; | |
493 | ||
494 | synchronize_rcu(); | |
ee836555 SK |
495 | } |
496 | ||
25985edc | 497 | /* Replace the internal control structure with a new one. */ |
bbefa1dd | 498 | static int padata_replace_one(struct padata_shell *ps) |
16295bec | 499 | { |
bbefa1dd | 500 | struct parallel_data *pd_new; |
16295bec | 501 | |
bbefa1dd HX |
502 | pd_new = padata_alloc_pd(ps); |
503 | if (!pd_new) | |
504 | return -ENOMEM; | |
16295bec | 505 | |
bbefa1dd HX |
506 | ps->opd = rcu_dereference_protected(ps->pd, 1); |
507 | rcu_assign_pointer(ps->pd, pd_new); | |
16295bec | 508 | |
bbefa1dd HX |
509 | return 0; |
510 | } | |
511 | ||
894c9ef9 | 512 | static int padata_replace(struct padata_instance *pinst) |
bbefa1dd | 513 | { |
bbefa1dd HX |
514 | struct padata_shell *ps; |
515 | int err; | |
516 | ||
517 | pinst->flags |= PADATA_RESET; | |
16295bec | 518 | |
bbefa1dd HX |
519 | cpumask_and(pinst->rcpumask.pcpu, pinst->cpumask.pcpu, |
520 | cpu_online_mask); | |
bbefa1dd | 521 | |
bbefa1dd HX |
522 | cpumask_and(pinst->rcpumask.cbcpu, pinst->cpumask.cbcpu, |
523 | cpu_online_mask); | |
e15bacbe | 524 | |
bbefa1dd HX |
525 | list_for_each_entry(ps, &pinst->pslist, list) { |
526 | err = padata_replace_one(ps); | |
527 | if (err) | |
528 | break; | |
529 | } | |
530 | ||
531 | synchronize_rcu(); | |
532 | ||
533 | list_for_each_entry_continue_reverse(ps, &pinst->pslist, list) | |
534 | if (atomic_dec_and_test(&ps->opd->refcnt)) | |
535 | padata_free_pd(ps->opd); | |
16295bec SK |
536 | |
537 | pinst->flags &= ~PADATA_RESET; | |
bbefa1dd HX |
538 | |
539 | return err; | |
16295bec SK |
540 | } |
541 | ||
33e54450 SK |
542 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
543 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
544 | const struct cpumask *cpumask) | |
545 | { | |
13614e0f | 546 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
547 | pinst->flags |= PADATA_INVALID; |
548 | return false; | |
549 | } | |
550 | ||
551 | pinst->flags &= ~PADATA_INVALID; | |
552 | return true; | |
553 | } | |
554 | ||
65ff577e SK |
555 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
556 | cpumask_var_t pcpumask, | |
557 | cpumask_var_t cbcpumask) | |
558 | { | |
559 | int valid; | |
bbefa1dd | 560 | int err; |
65ff577e SK |
561 | |
562 | valid = padata_validate_cpumask(pinst, pcpumask); | |
563 | if (!valid) { | |
564 | __padata_stop(pinst); | |
565 | goto out_replace; | |
566 | } | |
567 | ||
568 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
569 | if (!valid) | |
570 | __padata_stop(pinst); | |
571 | ||
572 | out_replace: | |
65ff577e SK |
573 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
574 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
575 | ||
894c9ef9 | 576 | err = padata_setup_cpumasks(pinst) ?: padata_replace(pinst); |
65ff577e SK |
577 | |
578 | if (valid) | |
579 | __padata_start(pinst); | |
580 | ||
bbefa1dd | 581 | return err; |
65ff577e SK |
582 | } |
583 | ||
e15bacbe DK |
584 | /** |
585 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
586 | * equivalent to @cpumask. | |
16295bec SK |
587 | * |
588 | * @pinst: padata instance | |
e15bacbe DK |
589 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
590 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
591 | * @cpumask: the cpumask to use |
592 | */ | |
e15bacbe DK |
593 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
594 | cpumask_var_t cpumask) | |
595 | { | |
596 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
597 | int err = -EINVAL; |
598 | ||
6751fb3c | 599 | get_online_cpus(); |
38228e88 | 600 | mutex_lock(&pinst->lock); |
6751fb3c | 601 | |
e15bacbe DK |
602 | switch (cpumask_type) { |
603 | case PADATA_CPU_PARALLEL: | |
604 | serial_mask = pinst->cpumask.cbcpu; | |
605 | parallel_mask = cpumask; | |
606 | break; | |
607 | case PADATA_CPU_SERIAL: | |
608 | parallel_mask = pinst->cpumask.pcpu; | |
609 | serial_mask = cpumask; | |
610 | break; | |
611 | default: | |
65ff577e | 612 | goto out; |
16295bec SK |
613 | } |
614 | ||
65ff577e | 615 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
616 | |
617 | out: | |
618 | mutex_unlock(&pinst->lock); | |
38228e88 | 619 | put_online_cpus(); |
16295bec SK |
620 | |
621 | return err; | |
622 | } | |
623 | EXPORT_SYMBOL(padata_set_cpumask); | |
624 | ||
19d795b6 AB |
625 | /** |
626 | * padata_start - start the parallel processing | |
627 | * | |
628 | * @pinst: padata instance to start | |
629 | */ | |
630 | int padata_start(struct padata_instance *pinst) | |
631 | { | |
632 | int err = 0; | |
633 | ||
634 | mutex_lock(&pinst->lock); | |
635 | ||
636 | if (pinst->flags & PADATA_INVALID) | |
637 | err = -EINVAL; | |
638 | ||
8ddab428 | 639 | __padata_start(pinst); |
19d795b6 AB |
640 | |
641 | mutex_unlock(&pinst->lock); | |
642 | ||
643 | return err; | |
644 | } | |
645 | EXPORT_SYMBOL(padata_start); | |
646 | ||
647 | /** | |
648 | * padata_stop - stop the parallel processing | |
649 | * | |
650 | * @pinst: padata instance to stop | |
651 | */ | |
652 | void padata_stop(struct padata_instance *pinst) | |
653 | { | |
654 | mutex_lock(&pinst->lock); | |
655 | __padata_stop(pinst); | |
656 | mutex_unlock(&pinst->lock); | |
657 | } | |
658 | EXPORT_SYMBOL(padata_stop); | |
659 | ||
660 | #ifdef CONFIG_HOTPLUG_CPU | |
661 | ||
16295bec SK |
662 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
663 | { | |
bbefa1dd | 664 | int err = 0; |
16295bec | 665 | |
13614e0f | 666 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
894c9ef9 | 667 | err = padata_replace(pinst); |
33e54450 | 668 | |
e15bacbe DK |
669 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
670 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 671 | __padata_start(pinst); |
16295bec SK |
672 | } |
673 | ||
bbefa1dd | 674 | return err; |
16295bec SK |
675 | } |
676 | ||
16295bec SK |
677 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
678 | { | |
bbefa1dd | 679 | int err = 0; |
16295bec | 680 | |
894c9ef9 | 681 | if (!cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe | 682 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 683 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 684 | __padata_stop(pinst); |
33e54450 | 685 | |
894c9ef9 | 686 | err = padata_replace(pinst); |
16295bec SK |
687 | } |
688 | ||
bbefa1dd | 689 | return err; |
16295bec SK |
690 | } |
691 | ||
e15bacbe DK |
692 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
693 | { | |
694 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
695 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
696 | } | |
697 | ||
30e92153 | 698 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 699 | { |
16295bec | 700 | struct padata_instance *pinst; |
30e92153 | 701 | int ret; |
16295bec | 702 | |
30e92153 SAS |
703 | pinst = hlist_entry_safe(node, struct padata_instance, node); |
704 | if (!pinst_has_cpu(pinst, cpu)) | |
705 | return 0; | |
16295bec | 706 | |
30e92153 SAS |
707 | mutex_lock(&pinst->lock); |
708 | ret = __padata_add_cpu(pinst, cpu); | |
709 | mutex_unlock(&pinst->lock); | |
710 | return ret; | |
711 | } | |
16295bec | 712 | |
894c9ef9 | 713 | static int padata_cpu_dead(unsigned int cpu, struct hlist_node *node) |
30e92153 SAS |
714 | { |
715 | struct padata_instance *pinst; | |
716 | int ret; | |
717 | ||
718 | pinst = hlist_entry_safe(node, struct padata_instance, node); | |
719 | if (!pinst_has_cpu(pinst, cpu)) | |
720 | return 0; | |
16295bec | 721 | |
30e92153 SAS |
722 | mutex_lock(&pinst->lock); |
723 | ret = __padata_remove_cpu(pinst, cpu); | |
724 | mutex_unlock(&pinst->lock); | |
725 | return ret; | |
16295bec | 726 | } |
30e92153 SAS |
727 | |
728 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 729 | #endif |
16295bec | 730 | |
5e017dc3 DK |
731 | static void __padata_free(struct padata_instance *pinst) |
732 | { | |
733 | #ifdef CONFIG_HOTPLUG_CPU | |
894c9ef9 | 734 | cpuhp_state_remove_instance_nocalls(CPUHP_PADATA_DEAD, &pinst->node); |
30e92153 | 735 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node); |
5e017dc3 DK |
736 | #endif |
737 | ||
bbefa1dd HX |
738 | WARN_ON(!list_empty(&pinst->pslist)); |
739 | ||
5e017dc3 | 740 | padata_stop(pinst); |
bbefa1dd HX |
741 | free_cpumask_var(pinst->rcpumask.cbcpu); |
742 | free_cpumask_var(pinst->rcpumask.pcpu); | |
5e017dc3 DK |
743 | free_cpumask_var(pinst->cpumask.pcpu); |
744 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
745 | destroy_workqueue(pinst->serial_wq); |
746 | destroy_workqueue(pinst->parallel_wq); | |
5e017dc3 DK |
747 | kfree(pinst); |
748 | } | |
749 | ||
750 | #define kobj2pinst(_kobj) \ | |
751 | container_of(_kobj, struct padata_instance, kobj) | |
752 | #define attr2pentry(_attr) \ | |
753 | container_of(_attr, struct padata_sysfs_entry, attr) | |
754 | ||
755 | static void padata_sysfs_release(struct kobject *kobj) | |
756 | { | |
757 | struct padata_instance *pinst = kobj2pinst(kobj); | |
758 | __padata_free(pinst); | |
759 | } | |
760 | ||
761 | struct padata_sysfs_entry { | |
762 | struct attribute attr; | |
763 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
764 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
765 | const char *, size_t); | |
766 | }; | |
767 | ||
768 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
769 | struct attribute *attr, char *buf) | |
770 | { | |
771 | struct cpumask *cpumask; | |
772 | ssize_t len; | |
773 | ||
774 | mutex_lock(&pinst->lock); | |
775 | if (!strcmp(attr->name, "serial_cpumask")) | |
776 | cpumask = pinst->cpumask.cbcpu; | |
777 | else | |
778 | cpumask = pinst->cpumask.pcpu; | |
779 | ||
4497da6f TH |
780 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
781 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 782 | mutex_unlock(&pinst->lock); |
4497da6f | 783 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
784 | } |
785 | ||
786 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
787 | struct attribute *attr, | |
788 | const char *buf, size_t count) | |
789 | { | |
790 | cpumask_var_t new_cpumask; | |
791 | ssize_t ret; | |
792 | int mask_type; | |
793 | ||
794 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
795 | return -ENOMEM; | |
796 | ||
797 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
798 | nr_cpumask_bits); | |
799 | if (ret < 0) | |
800 | goto out; | |
801 | ||
802 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
803 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
804 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
805 | if (!ret) | |
806 | ret = count; | |
807 | ||
808 | out: | |
809 | free_cpumask_var(new_cpumask); | |
810 | return ret; | |
811 | } | |
812 | ||
813 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
814 | static struct padata_sysfs_entry _name##_attr = \ | |
815 | __ATTR(_name, 0644, _show_name, _store_name) | |
816 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
817 | static struct padata_sysfs_entry _name##_attr = \ | |
818 | __ATTR(_name, 0400, _show_name, NULL) | |
819 | ||
820 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
821 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
822 | ||
823 | /* | |
824 | * Padata sysfs provides the following objects: | |
825 | * serial_cpumask [RW] - cpumask for serial workers | |
826 | * parallel_cpumask [RW] - cpumask for parallel workers | |
827 | */ | |
828 | static struct attribute *padata_default_attrs[] = { | |
829 | &serial_cpumask_attr.attr, | |
830 | ¶llel_cpumask_attr.attr, | |
831 | NULL, | |
832 | }; | |
2064fbc7 | 833 | ATTRIBUTE_GROUPS(padata_default); |
5e017dc3 DK |
834 | |
835 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
836 | struct attribute *attr, char *buf) | |
837 | { | |
838 | struct padata_instance *pinst; | |
839 | struct padata_sysfs_entry *pentry; | |
840 | ssize_t ret = -EIO; | |
841 | ||
842 | pinst = kobj2pinst(kobj); | |
843 | pentry = attr2pentry(attr); | |
844 | if (pentry->show) | |
845 | ret = pentry->show(pinst, attr, buf); | |
846 | ||
847 | return ret; | |
848 | } | |
849 | ||
850 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
851 | const char *buf, size_t count) | |
852 | { | |
853 | struct padata_instance *pinst; | |
854 | struct padata_sysfs_entry *pentry; | |
855 | ssize_t ret = -EIO; | |
856 | ||
857 | pinst = kobj2pinst(kobj); | |
858 | pentry = attr2pentry(attr); | |
859 | if (pentry->show) | |
860 | ret = pentry->store(pinst, attr, buf, count); | |
861 | ||
862 | return ret; | |
863 | } | |
864 | ||
865 | static const struct sysfs_ops padata_sysfs_ops = { | |
866 | .show = padata_sysfs_show, | |
867 | .store = padata_sysfs_store, | |
868 | }; | |
869 | ||
870 | static struct kobj_type padata_attr_type = { | |
871 | .sysfs_ops = &padata_sysfs_ops, | |
2064fbc7 | 872 | .default_groups = padata_default_groups, |
5e017dc3 DK |
873 | .release = padata_sysfs_release, |
874 | }; | |
875 | ||
e15bacbe | 876 | /** |
e6cc1170 SK |
877 | * padata_alloc - allocate and initialize a padata instance and specify |
878 | * cpumasks for serial and parallel workers. | |
16295bec | 879 | * |
b128a304 | 880 | * @name: used to identify the instance |
e15bacbe DK |
881 | * @pcpumask: cpumask that will be used for padata parallelization |
882 | * @cbcpumask: cpumask that will be used for padata serialization | |
16295bec | 883 | */ |
b128a304 | 884 | static struct padata_instance *padata_alloc(const char *name, |
9596695e TG |
885 | const struct cpumask *pcpumask, |
886 | const struct cpumask *cbcpumask) | |
16295bec | 887 | { |
16295bec | 888 | struct padata_instance *pinst; |
16295bec SK |
889 | |
890 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
891 | if (!pinst) | |
892 | goto err; | |
893 | ||
bfde23ce DJ |
894 | pinst->parallel_wq = alloc_workqueue("%s_parallel", WQ_UNBOUND, 0, |
895 | name); | |
45d153c0 | 896 | if (!pinst->parallel_wq) |
16295bec | 897 | goto err_free_inst; |
b128a304 | 898 | |
cc491d8e DJ |
899 | get_online_cpus(); |
900 | ||
45d153c0 DJ |
901 | pinst->serial_wq = alloc_workqueue("%s_serial", WQ_MEM_RECLAIM | |
902 | WQ_CPU_INTENSIVE, 1, name); | |
903 | if (!pinst->serial_wq) | |
cc491d8e | 904 | goto err_put_cpus; |
45d153c0 DJ |
905 | |
906 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) | |
907 | goto err_free_serial_wq; | |
e15bacbe DK |
908 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
909 | free_cpumask_var(pinst->cpumask.pcpu); | |
45d153c0 | 910 | goto err_free_serial_wq; |
33e54450 | 911 | } |
e15bacbe DK |
912 | if (!padata_validate_cpumask(pinst, pcpumask) || |
913 | !padata_validate_cpumask(pinst, cbcpumask)) | |
914 | goto err_free_masks; | |
16295bec | 915 | |
bbefa1dd | 916 | if (!alloc_cpumask_var(&pinst->rcpumask.pcpu, GFP_KERNEL)) |
e15bacbe | 917 | goto err_free_masks; |
bbefa1dd HX |
918 | if (!alloc_cpumask_var(&pinst->rcpumask.cbcpu, GFP_KERNEL)) |
919 | goto err_free_rcpumask_pcpu; | |
74781387 | 920 | |
bbefa1dd | 921 | INIT_LIST_HEAD(&pinst->pslist); |
16295bec | 922 | |
e15bacbe DK |
923 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
924 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
bbefa1dd HX |
925 | cpumask_and(pinst->rcpumask.pcpu, pcpumask, cpu_online_mask); |
926 | cpumask_and(pinst->rcpumask.cbcpu, cbcpumask, cpu_online_mask); | |
927 | ||
928 | if (padata_setup_cpumasks(pinst)) | |
91a71d61 | 929 | goto err_free_rcpumask_cbcpu; |
16295bec SK |
930 | |
931 | pinst->flags = 0; | |
932 | ||
5e017dc3 | 933 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
934 | mutex_init(&pinst->lock); |
935 | ||
b8b4a416 | 936 | #ifdef CONFIG_HOTPLUG_CPU |
c5a81c8f | 937 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node); |
894c9ef9 DJ |
938 | cpuhp_state_add_instance_nocalls_cpuslocked(CPUHP_PADATA_DEAD, |
939 | &pinst->node); | |
b8b4a416 | 940 | #endif |
cc491d8e DJ |
941 | |
942 | put_online_cpus(); | |
943 | ||
16295bec SK |
944 | return pinst; |
945 | ||
bbefa1dd HX |
946 | err_free_rcpumask_cbcpu: |
947 | free_cpumask_var(pinst->rcpumask.cbcpu); | |
948 | err_free_rcpumask_pcpu: | |
949 | free_cpumask_var(pinst->rcpumask.pcpu); | |
e15bacbe DK |
950 | err_free_masks: |
951 | free_cpumask_var(pinst->cpumask.pcpu); | |
952 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
953 | err_free_serial_wq: |
954 | destroy_workqueue(pinst->serial_wq); | |
cc491d8e DJ |
955 | err_put_cpus: |
956 | put_online_cpus(); | |
45d153c0 | 957 | destroy_workqueue(pinst->parallel_wq); |
16295bec SK |
958 | err_free_inst: |
959 | kfree(pinst); | |
960 | err: | |
961 | return NULL; | |
962 | } | |
16295bec | 963 | |
9596695e TG |
964 | /** |
965 | * padata_alloc_possible - Allocate and initialize padata instance. | |
966 | * Use the cpu_possible_mask for serial and | |
967 | * parallel workers. | |
968 | * | |
b128a304 | 969 | * @name: used to identify the instance |
9596695e | 970 | */ |
b128a304 | 971 | struct padata_instance *padata_alloc_possible(const char *name) |
9596695e | 972 | { |
b128a304 | 973 | return padata_alloc(name, cpu_possible_mask, cpu_possible_mask); |
9596695e TG |
974 | } |
975 | EXPORT_SYMBOL(padata_alloc_possible); | |
976 | ||
0198ffd1 | 977 | /** |
16295bec SK |
978 | * padata_free - free a padata instance |
979 | * | |
0198ffd1 | 980 | * @padata_inst: padata instance to free |
16295bec SK |
981 | */ |
982 | void padata_free(struct padata_instance *pinst) | |
983 | { | |
5e017dc3 | 984 | kobject_put(&pinst->kobj); |
16295bec SK |
985 | } |
986 | EXPORT_SYMBOL(padata_free); | |
30e92153 | 987 | |
bbefa1dd HX |
988 | /** |
989 | * padata_alloc_shell - Allocate and initialize padata shell. | |
990 | * | |
991 | * @pinst: Parent padata_instance object. | |
992 | */ | |
993 | struct padata_shell *padata_alloc_shell(struct padata_instance *pinst) | |
994 | { | |
995 | struct parallel_data *pd; | |
996 | struct padata_shell *ps; | |
997 | ||
998 | ps = kzalloc(sizeof(*ps), GFP_KERNEL); | |
999 | if (!ps) | |
1000 | goto out; | |
1001 | ||
1002 | ps->pinst = pinst; | |
1003 | ||
1004 | get_online_cpus(); | |
1005 | pd = padata_alloc_pd(ps); | |
1006 | put_online_cpus(); | |
1007 | ||
1008 | if (!pd) | |
1009 | goto out_free_ps; | |
1010 | ||
1011 | mutex_lock(&pinst->lock); | |
1012 | RCU_INIT_POINTER(ps->pd, pd); | |
1013 | list_add(&ps->list, &pinst->pslist); | |
1014 | mutex_unlock(&pinst->lock); | |
1015 | ||
1016 | return ps; | |
1017 | ||
1018 | out_free_ps: | |
1019 | kfree(ps); | |
1020 | out: | |
1021 | return NULL; | |
1022 | } | |
1023 | EXPORT_SYMBOL(padata_alloc_shell); | |
1024 | ||
1025 | /** | |
1026 | * padata_free_shell - free a padata shell | |
1027 | * | |
1028 | * @ps: padata shell to free | |
1029 | */ | |
1030 | void padata_free_shell(struct padata_shell *ps) | |
1031 | { | |
1032 | struct padata_instance *pinst = ps->pinst; | |
1033 | ||
1034 | mutex_lock(&pinst->lock); | |
1035 | list_del(&ps->list); | |
1036 | padata_free_pd(rcu_dereference_protected(ps->pd, 1)); | |
1037 | mutex_unlock(&pinst->lock); | |
1038 | ||
1039 | kfree(ps); | |
1040 | } | |
1041 | EXPORT_SYMBOL(padata_free_shell); | |
1042 | ||
30e92153 SAS |
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", | |
894c9ef9 | 1050 | padata_cpu_online, NULL); |
30e92153 SAS |
1051 | if (ret < 0) |
1052 | return ret; | |
1053 | hp_online = ret; | |
894c9ef9 DJ |
1054 | |
1055 | ret = cpuhp_setup_state_multi(CPUHP_PADATA_DEAD, "padata:dead", | |
1056 | NULL, padata_cpu_dead); | |
1057 | if (ret < 0) { | |
1058 | cpuhp_remove_multi_state(hp_online); | |
1059 | return ret; | |
1060 | } | |
30e92153 SAS |
1061 | return 0; |
1062 | } | |
1063 | module_init(padata_driver_init); | |
1064 | ||
1065 | static __exit void padata_driver_exit(void) | |
1066 | { | |
894c9ef9 | 1067 | cpuhp_remove_multi_state(CPUHP_PADATA_DEAD); |
30e92153 SAS |
1068 | cpuhp_remove_multi_state(hp_online); |
1069 | } | |
1070 | module_exit(padata_driver_exit); | |
1071 | #endif |