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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 | * | |
bfcdcef8 | 5 | * See Documentation/core-api/padata.rst for more information. |
107f8bda | 6 | * |
16295bec SK |
7 | * Copyright (C) 2008, 2009 secunet Security Networks AG |
8 | * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> | |
9 | * | |
004ed426 DJ |
10 | * Copyright (c) 2020 Oracle and/or its affiliates. |
11 | * Author: Daniel Jordan <daniel.m.jordan@oracle.com> | |
12 | * | |
16295bec SK |
13 | * This program is free software; you can redistribute it and/or modify it |
14 | * under the terms and conditions of the GNU General Public License, | |
15 | * version 2, as published by the Free Software Foundation. | |
16 | * | |
17 | * This program is distributed in the hope it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
20 | * more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along with | |
23 | * this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
25 | */ | |
26 | ||
004ed426 | 27 | #include <linux/completion.h> |
9984de1a | 28 | #include <linux/export.h> |
16295bec SK |
29 | #include <linux/cpumask.h> |
30 | #include <linux/err.h> | |
31 | #include <linux/cpu.h> | |
32 | #include <linux/padata.h> | |
33 | #include <linux/mutex.h> | |
34 | #include <linux/sched.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
5e017dc3 | 36 | #include <linux/sysfs.h> |
16295bec SK |
37 | #include <linux/rcupdate.h> |
38 | ||
004ed426 DJ |
39 | #define PADATA_WORK_ONSTACK 1 /* Work's memory is on stack */ |
40 | ||
4611ce22 DJ |
41 | struct padata_work { |
42 | struct work_struct pw_work; | |
43 | struct list_head pw_list; /* padata_free_works linkage */ | |
44 | void *pw_data; | |
45 | }; | |
46 | ||
47 | static DEFINE_SPINLOCK(padata_works_lock); | |
48 | static struct padata_work *padata_works; | |
49 | static LIST_HEAD(padata_free_works); | |
16295bec | 50 | |
004ed426 DJ |
51 | struct padata_mt_job_state { |
52 | spinlock_t lock; | |
53 | struct completion completion; | |
54 | struct padata_mt_job *job; | |
55 | int nworks; | |
56 | int nworks_fini; | |
57 | unsigned long chunk_size; | |
58 | }; | |
59 | ||
07928d9b | 60 | static void padata_free_pd(struct parallel_data *pd); |
004ed426 | 61 | static void __init padata_mt_helper(struct work_struct *work); |
07928d9b | 62 | |
16295bec SK |
63 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) |
64 | { | |
65 | int cpu, target_cpu; | |
66 | ||
e15bacbe | 67 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
16295bec | 68 | for (cpu = 0; cpu < cpu_index; cpu++) |
e15bacbe | 69 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
16295bec SK |
70 | |
71 | return target_cpu; | |
72 | } | |
73 | ||
bfde23ce | 74 | static int padata_cpu_hash(struct parallel_data *pd, unsigned int seq_nr) |
16295bec | 75 | { |
16295bec SK |
76 | /* |
77 | * Hash the sequence numbers to the cpus by taking | |
78 | * seq_nr mod. number of cpus in use. | |
79 | */ | |
bfde23ce | 80 | int cpu_index = seq_nr % cpumask_weight(pd->cpumask.pcpu); |
16295bec SK |
81 | |
82 | return padata_index_to_cpu(pd, cpu_index); | |
83 | } | |
84 | ||
4611ce22 | 85 | static struct padata_work *padata_work_alloc(void) |
16295bec | 86 | { |
4611ce22 | 87 | struct padata_work *pw; |
16295bec | 88 | |
4611ce22 | 89 | lockdep_assert_held(&padata_works_lock); |
16295bec | 90 | |
4611ce22 DJ |
91 | if (list_empty(&padata_free_works)) |
92 | return NULL; /* No more work items allowed to be queued. */ | |
16295bec | 93 | |
4611ce22 DJ |
94 | pw = list_first_entry(&padata_free_works, struct padata_work, pw_list); |
95 | list_del(&pw->pw_list); | |
96 | return pw; | |
97 | } | |
16295bec | 98 | |
4611ce22 | 99 | static void padata_work_init(struct padata_work *pw, work_func_t work_fn, |
004ed426 | 100 | void *data, int flags) |
4611ce22 | 101 | { |
004ed426 DJ |
102 | if (flags & PADATA_WORK_ONSTACK) |
103 | INIT_WORK_ONSTACK(&pw->pw_work, work_fn); | |
104 | else | |
105 | INIT_WORK(&pw->pw_work, work_fn); | |
4611ce22 DJ |
106 | pw->pw_data = data; |
107 | } | |
16295bec | 108 | |
004ed426 DJ |
109 | static int __init padata_work_alloc_mt(int nworks, void *data, |
110 | struct list_head *head) | |
111 | { | |
112 | int i; | |
113 | ||
114 | spin_lock(&padata_works_lock); | |
115 | /* Start at 1 because the current task participates in the job. */ | |
116 | for (i = 1; i < nworks; ++i) { | |
117 | struct padata_work *pw = padata_work_alloc(); | |
118 | ||
119 | if (!pw) | |
120 | break; | |
121 | padata_work_init(pw, padata_mt_helper, data, 0); | |
122 | list_add(&pw->pw_list, head); | |
123 | } | |
124 | spin_unlock(&padata_works_lock); | |
125 | ||
126 | return i; | |
127 | } | |
128 | ||
4611ce22 DJ |
129 | static void padata_work_free(struct padata_work *pw) |
130 | { | |
131 | lockdep_assert_held(&padata_works_lock); | |
132 | list_add(&pw->pw_list, &padata_free_works); | |
133 | } | |
16295bec | 134 | |
004ed426 DJ |
135 | static void __init padata_works_free(struct list_head *works) |
136 | { | |
137 | struct padata_work *cur, *next; | |
138 | ||
139 | if (list_empty(works)) | |
140 | return; | |
141 | ||
142 | spin_lock(&padata_works_lock); | |
143 | list_for_each_entry_safe(cur, next, works, pw_list) { | |
144 | list_del(&cur->pw_list); | |
145 | padata_work_free(cur); | |
146 | } | |
147 | spin_unlock(&padata_works_lock); | |
148 | } | |
149 | ||
4611ce22 DJ |
150 | static void padata_parallel_worker(struct work_struct *parallel_work) |
151 | { | |
152 | struct padata_work *pw = container_of(parallel_work, struct padata_work, | |
153 | pw_work); | |
154 | struct padata_priv *padata = pw->pw_data; | |
16295bec | 155 | |
4611ce22 DJ |
156 | local_bh_disable(); |
157 | padata->parallel(padata); | |
158 | spin_lock(&padata_works_lock); | |
159 | padata_work_free(pw); | |
160 | spin_unlock(&padata_works_lock); | |
16295bec SK |
161 | local_bh_enable(); |
162 | } | |
163 | ||
0198ffd1 | 164 | /** |
16295bec SK |
165 | * padata_do_parallel - padata parallelization function |
166 | * | |
bbefa1dd | 167 | * @ps: padatashell |
16295bec | 168 | * @padata: object to be parallelized |
e6ce0e08 DJ |
169 | * @cb_cpu: pointer to the CPU that the serialization callback function should |
170 | * run on. If it's not in the serial cpumask of @pinst | |
171 | * (i.e. cpumask.cbcpu), this function selects a fallback CPU and if | |
172 | * none found, returns -EINVAL. | |
16295bec SK |
173 | * |
174 | * The parallelization callback function will run with BHs off. | |
175 | * Note: Every object which is parallelized by padata_do_parallel | |
176 | * must be seen by padata_do_serial. | |
bfcdcef8 DJ |
177 | * |
178 | * Return: 0 on success or else negative error code. | |
16295bec | 179 | */ |
bbefa1dd | 180 | int padata_do_parallel(struct padata_shell *ps, |
e6ce0e08 | 181 | struct padata_priv *padata, int *cb_cpu) |
16295bec | 182 | { |
bbefa1dd | 183 | struct padata_instance *pinst = ps->pinst; |
4611ce22 | 184 | int i, cpu, cpu_index, err; |
16295bec | 185 | struct parallel_data *pd; |
4611ce22 | 186 | struct padata_work *pw; |
16295bec SK |
187 | |
188 | rcu_read_lock_bh(); | |
189 | ||
bbefa1dd | 190 | pd = rcu_dereference_bh(ps->pd); |
16295bec | 191 | |
83f619f3 | 192 | err = -EINVAL; |
7424713b | 193 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
194 | goto out; |
195 | ||
e6ce0e08 DJ |
196 | if (!cpumask_test_cpu(*cb_cpu, pd->cpumask.cbcpu)) { |
197 | if (!cpumask_weight(pd->cpumask.cbcpu)) | |
198 | goto out; | |
199 | ||
200 | /* Select an alternate fallback CPU and notify the caller. */ | |
201 | cpu_index = *cb_cpu % cpumask_weight(pd->cpumask.cbcpu); | |
202 | ||
203 | cpu = cpumask_first(pd->cpumask.cbcpu); | |
204 | for (i = 0; i < cpu_index; i++) | |
205 | cpu = cpumask_next(cpu, pd->cpumask.cbcpu); | |
206 | ||
207 | *cb_cpu = cpu; | |
208 | } | |
16295bec SK |
209 | |
210 | err = -EBUSY; | |
211 | if ((pinst->flags & PADATA_RESET)) | |
212 | goto out; | |
213 | ||
16295bec SK |
214 | atomic_inc(&pd->refcnt); |
215 | padata->pd = pd; | |
e6ce0e08 | 216 | padata->cb_cpu = *cb_cpu; |
16295bec | 217 | |
4611ce22 DJ |
218 | spin_lock(&padata_works_lock); |
219 | padata->seq_nr = ++pd->seq_nr; | |
220 | pw = padata_work_alloc(); | |
221 | spin_unlock(&padata_works_lock); | |
1b0df11f DJ |
222 | |
223 | rcu_read_unlock_bh(); | |
224 | ||
4611ce22 | 225 | if (pw) { |
004ed426 | 226 | padata_work_init(pw, padata_parallel_worker, padata, 0); |
4611ce22 DJ |
227 | queue_work(pinst->parallel_wq, &pw->pw_work); |
228 | } else { | |
229 | /* Maximum works limit exceeded, run in the current task. */ | |
230 | padata->parallel(padata); | |
231 | } | |
16295bec | 232 | |
4611ce22 | 233 | return 0; |
16295bec SK |
234 | out: |
235 | rcu_read_unlock_bh(); | |
236 | ||
237 | return err; | |
238 | } | |
239 | EXPORT_SYMBOL(padata_do_parallel); | |
240 | ||
0198ffd1 | 241 | /* |
bfde23ce | 242 | * padata_find_next - Find the next object that needs serialization. |
0198ffd1 | 243 | * |
bfcdcef8 DJ |
244 | * Return: |
245 | * * A pointer to the control struct of the next object that needs | |
246 | * serialization, if present in one of the percpu reorder queues. | |
247 | * * NULL, if the next object that needs serialization will | |
248 | * be parallel processed by another cpu and is not yet present in | |
249 | * the cpu's reorder queue. | |
0198ffd1 | 250 | */ |
bfde23ce DJ |
251 | static struct padata_priv *padata_find_next(struct parallel_data *pd, |
252 | bool remove_object) | |
16295bec | 253 | { |
16295bec SK |
254 | struct padata_priv *padata; |
255 | struct padata_list *reorder; | |
6fc4dbcf | 256 | int cpu = pd->cpu; |
16295bec | 257 | |
f601c725 | 258 | reorder = per_cpu_ptr(pd->reorder_list, cpu); |
16295bec | 259 | |
de5540d0 | 260 | spin_lock(&reorder->lock); |
bfde23ce DJ |
261 | if (list_empty(&reorder->list)) { |
262 | spin_unlock(&reorder->lock); | |
263 | return NULL; | |
264 | } | |
16295bec | 265 | |
bfde23ce | 266 | padata = list_entry(reorder->list.next, struct padata_priv, list); |
16295bec | 267 | |
bfde23ce DJ |
268 | /* |
269 | * Checks the rare case where two or more parallel jobs have hashed to | |
270 | * the same CPU and one of the later ones finishes first. | |
271 | */ | |
272 | if (padata->seq_nr != pd->processed) { | |
de5540d0 | 273 | spin_unlock(&reorder->lock); |
bfde23ce | 274 | return NULL; |
16295bec SK |
275 | } |
276 | ||
bfde23ce DJ |
277 | if (remove_object) { |
278 | list_del_init(&padata->list); | |
bfde23ce DJ |
279 | ++pd->processed; |
280 | pd->cpu = cpumask_next_wrap(cpu, pd->cpumask.pcpu, -1, false); | |
16295bec SK |
281 | } |
282 | ||
bfde23ce | 283 | spin_unlock(&reorder->lock); |
16295bec SK |
284 | return padata; |
285 | } | |
286 | ||
287 | static void padata_reorder(struct parallel_data *pd) | |
288 | { | |
bbefa1dd | 289 | struct padata_instance *pinst = pd->ps->pinst; |
3047817b | 290 | int cb_cpu; |
16295bec | 291 | struct padata_priv *padata; |
e15bacbe | 292 | struct padata_serial_queue *squeue; |
f601c725 | 293 | struct padata_list *reorder; |
16295bec | 294 | |
0198ffd1 SK |
295 | /* |
296 | * We need to ensure that only one cpu can work on dequeueing of | |
297 | * the reorder queue the time. Calculating in which percpu reorder | |
298 | * queue the next object will arrive takes some time. A spinlock | |
299 | * would be highly contended. Also it is not clear in which order | |
300 | * the objects arrive to the reorder queues. So a cpu could wait to | |
301 | * get the lock just to notice that there is nothing to do at the | |
302 | * moment. Therefore we use a trylock and let the holder of the lock | |
303 | * care for all the objects enqueued during the holdtime of the lock. | |
304 | */ | |
16295bec | 305 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 306 | return; |
16295bec SK |
307 | |
308 | while (1) { | |
bfde23ce | 309 | padata = padata_find_next(pd, true); |
16295bec | 310 | |
0198ffd1 | 311 | /* |
69b34844 JD |
312 | * If the next object that needs serialization is parallel |
313 | * processed by another cpu and is still on it's way to the | |
314 | * cpu's reorder queue, nothing to do for now. | |
0198ffd1 | 315 | */ |
bfde23ce | 316 | if (!padata) |
16295bec SK |
317 | break; |
318 | ||
3047817b SK |
319 | cb_cpu = padata->cb_cpu; |
320 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 321 | |
e15bacbe DK |
322 | spin_lock(&squeue->serial.lock); |
323 | list_add_tail(&padata->list, &squeue->serial.list); | |
324 | spin_unlock(&squeue->serial.lock); | |
16295bec | 325 | |
45d153c0 | 326 | queue_work_on(cb_cpu, pinst->serial_wq, &squeue->work); |
16295bec SK |
327 | } |
328 | ||
329 | spin_unlock_bh(&pd->lock); | |
330 | ||
0198ffd1 SK |
331 | /* |
332 | * The next object that needs serialization might have arrived to | |
6fc4dbcf | 333 | * the reorder queues in the meantime. |
cf144f81 | 334 | * |
6fc4dbcf HX |
335 | * Ensure reorder queue is read after pd->lock is dropped so we see |
336 | * new objects from another task in padata_do_serial. Pairs with | |
e04ec0de | 337 | * smp_mb in padata_do_serial. |
0198ffd1 | 338 | */ |
cf144f81 | 339 | smp_mb(); |
16295bec | 340 | |
f601c725 DJ |
341 | reorder = per_cpu_ptr(pd->reorder_list, pd->cpu); |
342 | if (!list_empty(&reorder->list) && padata_find_next(pd, false)) | |
45d153c0 | 343 | queue_work(pinst->serial_wq, &pd->reorder_work); |
16295bec SK |
344 | } |
345 | ||
cf5868c8 MK |
346 | static void invoke_padata_reorder(struct work_struct *work) |
347 | { | |
cf5868c8 MK |
348 | struct parallel_data *pd; |
349 | ||
350 | local_bh_disable(); | |
6fc4dbcf | 351 | pd = container_of(work, struct parallel_data, reorder_work); |
cf5868c8 MK |
352 | padata_reorder(pd); |
353 | local_bh_enable(); | |
354 | } | |
355 | ||
e15bacbe | 356 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 357 | { |
e15bacbe | 358 | struct padata_serial_queue *squeue; |
16295bec SK |
359 | struct parallel_data *pd; |
360 | LIST_HEAD(local_list); | |
07928d9b | 361 | int cnt; |
16295bec SK |
362 | |
363 | local_bh_disable(); | |
e15bacbe DK |
364 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
365 | pd = squeue->pd; | |
16295bec | 366 | |
e15bacbe DK |
367 | spin_lock(&squeue->serial.lock); |
368 | list_replace_init(&squeue->serial.list, &local_list); | |
369 | spin_unlock(&squeue->serial.lock); | |
16295bec | 370 | |
07928d9b HX |
371 | cnt = 0; |
372 | ||
16295bec SK |
373 | while (!list_empty(&local_list)) { |
374 | struct padata_priv *padata; | |
375 | ||
376 | padata = list_entry(local_list.next, | |
377 | struct padata_priv, list); | |
378 | ||
379 | list_del_init(&padata->list); | |
380 | ||
381 | padata->serial(padata); | |
07928d9b | 382 | cnt++; |
16295bec SK |
383 | } |
384 | local_bh_enable(); | |
07928d9b HX |
385 | |
386 | if (atomic_sub_and_test(cnt, &pd->refcnt)) | |
387 | padata_free_pd(pd); | |
16295bec SK |
388 | } |
389 | ||
0198ffd1 | 390 | /** |
16295bec SK |
391 | * padata_do_serial - padata serialization function |
392 | * | |
393 | * @padata: object to be serialized. | |
394 | * | |
395 | * padata_do_serial must be called for every parallelized object. | |
396 | * The serialization callback function will run with BHs off. | |
397 | */ | |
398 | void padata_do_serial(struct padata_priv *padata) | |
399 | { | |
065cf577 | 400 | struct parallel_data *pd = padata->pd; |
4611ce22 | 401 | int hashed_cpu = padata_cpu_hash(pd, padata->seq_nr); |
f601c725 | 402 | struct padata_list *reorder = per_cpu_ptr(pd->reorder_list, hashed_cpu); |
bfde23ce | 403 | struct padata_priv *cur; |
16295bec | 404 | |
f601c725 | 405 | spin_lock(&reorder->lock); |
bfde23ce | 406 | /* Sort in ascending order of sequence number. */ |
f601c725 | 407 | list_for_each_entry_reverse(cur, &reorder->list, list) |
bfde23ce DJ |
408 | if (cur->seq_nr < padata->seq_nr) |
409 | break; | |
410 | list_add(&padata->list, &cur->list); | |
f601c725 | 411 | spin_unlock(&reorder->lock); |
16295bec | 412 | |
cf144f81 | 413 | /* |
6fc4dbcf | 414 | * Ensure the addition to the reorder list is ordered correctly |
cf144f81 DJ |
415 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb |
416 | * in padata_reorder. | |
417 | */ | |
e04ec0de | 418 | smp_mb(); |
cf144f81 | 419 | |
6fc4dbcf | 420 | padata_reorder(pd); |
16295bec SK |
421 | } |
422 | EXPORT_SYMBOL(padata_do_serial); | |
423 | ||
bbefa1dd | 424 | static int padata_setup_cpumasks(struct padata_instance *pinst) |
16295bec | 425 | { |
bfde23ce | 426 | struct workqueue_attrs *attrs; |
bbefa1dd HX |
427 | int err; |
428 | ||
429 | attrs = alloc_workqueue_attrs(); | |
430 | if (!attrs) | |
431 | return -ENOMEM; | |
432 | ||
433 | /* Restrict parallel_wq workers to pd->cpumask.pcpu. */ | |
434 | cpumask_copy(attrs->cpumask, pinst->cpumask.pcpu); | |
435 | err = apply_workqueue_attrs(pinst->parallel_wq, attrs); | |
436 | free_workqueue_attrs(attrs); | |
437 | ||
438 | return err; | |
439 | } | |
440 | ||
004ed426 DJ |
441 | static void __init padata_mt_helper(struct work_struct *w) |
442 | { | |
443 | struct padata_work *pw = container_of(w, struct padata_work, pw_work); | |
444 | struct padata_mt_job_state *ps = pw->pw_data; | |
445 | struct padata_mt_job *job = ps->job; | |
446 | bool done; | |
447 | ||
448 | spin_lock(&ps->lock); | |
449 | ||
450 | while (job->size > 0) { | |
451 | unsigned long start, size, end; | |
452 | ||
453 | start = job->start; | |
454 | /* So end is chunk size aligned if enough work remains. */ | |
455 | size = roundup(start + 1, ps->chunk_size) - start; | |
456 | size = min(size, job->size); | |
457 | end = start + size; | |
458 | ||
459 | job->start = end; | |
460 | job->size -= size; | |
461 | ||
462 | spin_unlock(&ps->lock); | |
463 | job->thread_fn(start, end, job->fn_arg); | |
464 | spin_lock(&ps->lock); | |
465 | } | |
466 | ||
467 | ++ps->nworks_fini; | |
468 | done = (ps->nworks_fini == ps->nworks); | |
469 | spin_unlock(&ps->lock); | |
470 | ||
471 | if (done) | |
472 | complete(&ps->completion); | |
473 | } | |
474 | ||
475 | /** | |
476 | * padata_do_multithreaded - run a multithreaded job | |
477 | * @job: Description of the job. | |
478 | * | |
479 | * See the definition of struct padata_mt_job for more details. | |
480 | */ | |
481 | void __init padata_do_multithreaded(struct padata_mt_job *job) | |
482 | { | |
483 | /* In case threads finish at different times. */ | |
484 | static const unsigned long load_balance_factor = 4; | |
485 | struct padata_work my_work, *pw; | |
486 | struct padata_mt_job_state ps; | |
487 | LIST_HEAD(works); | |
488 | int nworks; | |
489 | ||
490 | if (job->size == 0) | |
491 | return; | |
492 | ||
493 | /* Ensure at least one thread when size < min_chunk. */ | |
494 | nworks = max(job->size / job->min_chunk, 1ul); | |
495 | nworks = min(nworks, job->max_threads); | |
496 | ||
497 | if (nworks == 1) { | |
498 | /* Single thread, no coordination needed, cut to the chase. */ | |
499 | job->thread_fn(job->start, job->start + job->size, job->fn_arg); | |
500 | return; | |
501 | } | |
502 | ||
503 | spin_lock_init(&ps.lock); | |
504 | init_completion(&ps.completion); | |
505 | ps.job = job; | |
506 | ps.nworks = padata_work_alloc_mt(nworks, &ps, &works); | |
507 | ps.nworks_fini = 0; | |
508 | ||
509 | /* | |
510 | * Chunk size is the amount of work a helper does per call to the | |
511 | * thread function. Load balance large jobs between threads by | |
512 | * increasing the number of chunks, guarantee at least the minimum | |
513 | * chunk size from the caller, and honor the caller's alignment. | |
514 | */ | |
515 | ps.chunk_size = job->size / (ps.nworks * load_balance_factor); | |
516 | ps.chunk_size = max(ps.chunk_size, job->min_chunk); | |
517 | ps.chunk_size = roundup(ps.chunk_size, job->align); | |
518 | ||
519 | list_for_each_entry(pw, &works, pw_list) | |
520 | queue_work(system_unbound_wq, &pw->pw_work); | |
521 | ||
522 | /* Use the current thread, which saves starting a workqueue worker. */ | |
523 | padata_work_init(&my_work, padata_mt_helper, &ps, PADATA_WORK_ONSTACK); | |
524 | padata_mt_helper(&my_work.pw_work); | |
525 | ||
526 | /* Wait for all the helpers to finish. */ | |
527 | wait_for_completion(&ps.completion); | |
528 | ||
529 | destroy_work_on_stack(&my_work.pw_work); | |
530 | padata_works_free(&works); | |
531 | } | |
532 | ||
e15bacbe DK |
533 | static void __padata_list_init(struct padata_list *pd_list) |
534 | { | |
535 | INIT_LIST_HEAD(&pd_list->list); | |
536 | spin_lock_init(&pd_list->lock); | |
537 | } | |
16295bec | 538 | |
e15bacbe DK |
539 | /* Initialize all percpu queues used by serial workers */ |
540 | static void padata_init_squeues(struct parallel_data *pd) | |
541 | { | |
542 | int cpu; | |
543 | struct padata_serial_queue *squeue; | |
7b389b2c | 544 | |
e15bacbe DK |
545 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
546 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
547 | squeue->pd = pd; | |
548 | __padata_list_init(&squeue->serial); | |
549 | INIT_WORK(&squeue->work, padata_serial_worker); | |
550 | } | |
551 | } | |
16295bec | 552 | |
f601c725 DJ |
553 | /* Initialize per-CPU reorder lists */ |
554 | static void padata_init_reorder_list(struct parallel_data *pd) | |
e15bacbe | 555 | { |
c51636a3 | 556 | int cpu; |
f601c725 | 557 | struct padata_list *list; |
16295bec | 558 | |
c51636a3 | 559 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
f601c725 DJ |
560 | list = per_cpu_ptr(pd->reorder_list, cpu); |
561 | __padata_list_init(list); | |
16295bec | 562 | } |
e15bacbe | 563 | } |
16295bec | 564 | |
e15bacbe | 565 | /* Allocate and initialize the internal cpumask dependend resources. */ |
bbefa1dd | 566 | static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) |
e15bacbe | 567 | { |
bbefa1dd | 568 | struct padata_instance *pinst = ps->pinst; |
e15bacbe | 569 | struct parallel_data *pd; |
16295bec | 570 | |
e15bacbe DK |
571 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
572 | if (!pd) | |
573 | goto err; | |
16295bec | 574 | |
f601c725 DJ |
575 | pd->reorder_list = alloc_percpu(struct padata_list); |
576 | if (!pd->reorder_list) | |
e15bacbe DK |
577 | goto err_free_pd; |
578 | ||
579 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
580 | if (!pd->squeue) | |
f601c725 | 581 | goto err_free_reorder_list; |
bfde23ce | 582 | |
bbefa1dd | 583 | pd->ps = ps; |
cec00e6e DJ |
584 | |
585 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) | |
e15bacbe | 586 | goto err_free_squeue; |
cec00e6e DJ |
587 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) |
588 | goto err_free_pcpu; | |
589 | ||
d69e037b DJ |
590 | cpumask_and(pd->cpumask.pcpu, pinst->cpumask.pcpu, cpu_online_mask); |
591 | cpumask_and(pd->cpumask.cbcpu, pinst->cpumask.cbcpu, cpu_online_mask); | |
16295bec | 592 | |
f601c725 | 593 | padata_init_reorder_list(pd); |
e15bacbe | 594 | padata_init_squeues(pd); |
4611ce22 | 595 | pd->seq_nr = -1; |
07928d9b | 596 | atomic_set(&pd->refcnt, 1); |
16295bec | 597 | spin_lock_init(&pd->lock); |
ec9c7d19 | 598 | pd->cpu = cpumask_first(pd->cpumask.pcpu); |
6fc4dbcf | 599 | INIT_WORK(&pd->reorder_work, invoke_padata_reorder); |
16295bec SK |
600 | |
601 | return pd; | |
602 | ||
cec00e6e DJ |
603 | err_free_pcpu: |
604 | free_cpumask_var(pd->cpumask.pcpu); | |
e15bacbe DK |
605 | err_free_squeue: |
606 | free_percpu(pd->squeue); | |
f601c725 DJ |
607 | err_free_reorder_list: |
608 | free_percpu(pd->reorder_list); | |
16295bec SK |
609 | err_free_pd: |
610 | kfree(pd); | |
611 | err: | |
612 | return NULL; | |
613 | } | |
614 | ||
615 | static void padata_free_pd(struct parallel_data *pd) | |
616 | { | |
e15bacbe DK |
617 | free_cpumask_var(pd->cpumask.pcpu); |
618 | free_cpumask_var(pd->cpumask.cbcpu); | |
f601c725 | 619 | free_percpu(pd->reorder_list); |
e15bacbe | 620 | free_percpu(pd->squeue); |
16295bec SK |
621 | kfree(pd); |
622 | } | |
623 | ||
4c879170 SK |
624 | static void __padata_start(struct padata_instance *pinst) |
625 | { | |
626 | pinst->flags |= PADATA_INIT; | |
627 | } | |
628 | ||
ee836555 SK |
629 | static void __padata_stop(struct padata_instance *pinst) |
630 | { | |
631 | if (!(pinst->flags & PADATA_INIT)) | |
632 | return; | |
633 | ||
634 | pinst->flags &= ~PADATA_INIT; | |
635 | ||
636 | synchronize_rcu(); | |
ee836555 SK |
637 | } |
638 | ||
25985edc | 639 | /* Replace the internal control structure with a new one. */ |
bbefa1dd | 640 | static int padata_replace_one(struct padata_shell *ps) |
16295bec | 641 | { |
bbefa1dd | 642 | struct parallel_data *pd_new; |
16295bec | 643 | |
bbefa1dd HX |
644 | pd_new = padata_alloc_pd(ps); |
645 | if (!pd_new) | |
646 | return -ENOMEM; | |
16295bec | 647 | |
bbefa1dd HX |
648 | ps->opd = rcu_dereference_protected(ps->pd, 1); |
649 | rcu_assign_pointer(ps->pd, pd_new); | |
16295bec | 650 | |
bbefa1dd HX |
651 | return 0; |
652 | } | |
653 | ||
894c9ef9 | 654 | static int padata_replace(struct padata_instance *pinst) |
bbefa1dd | 655 | { |
bbefa1dd | 656 | struct padata_shell *ps; |
41ccdbfd | 657 | int err = 0; |
bbefa1dd HX |
658 | |
659 | pinst->flags |= PADATA_RESET; | |
16295bec | 660 | |
bbefa1dd HX |
661 | list_for_each_entry(ps, &pinst->pslist, list) { |
662 | err = padata_replace_one(ps); | |
663 | if (err) | |
664 | break; | |
665 | } | |
666 | ||
667 | synchronize_rcu(); | |
668 | ||
669 | list_for_each_entry_continue_reverse(ps, &pinst->pslist, list) | |
670 | if (atomic_dec_and_test(&ps->opd->refcnt)) | |
671 | padata_free_pd(ps->opd); | |
16295bec SK |
672 | |
673 | pinst->flags &= ~PADATA_RESET; | |
bbefa1dd HX |
674 | |
675 | return err; | |
16295bec SK |
676 | } |
677 | ||
33e54450 SK |
678 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
679 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
680 | const struct cpumask *cpumask) | |
681 | { | |
13614e0f | 682 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
683 | pinst->flags |= PADATA_INVALID; |
684 | return false; | |
685 | } | |
686 | ||
687 | pinst->flags &= ~PADATA_INVALID; | |
688 | return true; | |
689 | } | |
690 | ||
65ff577e SK |
691 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
692 | cpumask_var_t pcpumask, | |
693 | cpumask_var_t cbcpumask) | |
694 | { | |
695 | int valid; | |
bbefa1dd | 696 | int err; |
65ff577e SK |
697 | |
698 | valid = padata_validate_cpumask(pinst, pcpumask); | |
699 | if (!valid) { | |
700 | __padata_stop(pinst); | |
701 | goto out_replace; | |
702 | } | |
703 | ||
704 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
705 | if (!valid) | |
706 | __padata_stop(pinst); | |
707 | ||
708 | out_replace: | |
65ff577e SK |
709 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
710 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
711 | ||
894c9ef9 | 712 | err = padata_setup_cpumasks(pinst) ?: padata_replace(pinst); |
65ff577e SK |
713 | |
714 | if (valid) | |
715 | __padata_start(pinst); | |
716 | ||
bbefa1dd | 717 | return err; |
65ff577e SK |
718 | } |
719 | ||
e15bacbe | 720 | /** |
bfcdcef8 DJ |
721 | * padata_set_cpumask - Sets specified by @cpumask_type cpumask to the value |
722 | * equivalent to @cpumask. | |
16295bec | 723 | * @pinst: padata instance |
e15bacbe DK |
724 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
725 | * to parallel and serial cpumasks respectively. | |
16295bec | 726 | * @cpumask: the cpumask to use |
bfcdcef8 DJ |
727 | * |
728 | * Return: 0 on success or negative error code | |
16295bec | 729 | */ |
e15bacbe DK |
730 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
731 | cpumask_var_t cpumask) | |
732 | { | |
733 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
734 | int err = -EINVAL; |
735 | ||
6751fb3c | 736 | get_online_cpus(); |
38228e88 | 737 | mutex_lock(&pinst->lock); |
6751fb3c | 738 | |
e15bacbe DK |
739 | switch (cpumask_type) { |
740 | case PADATA_CPU_PARALLEL: | |
741 | serial_mask = pinst->cpumask.cbcpu; | |
742 | parallel_mask = cpumask; | |
743 | break; | |
744 | case PADATA_CPU_SERIAL: | |
745 | parallel_mask = pinst->cpumask.pcpu; | |
746 | serial_mask = cpumask; | |
747 | break; | |
748 | default: | |
65ff577e | 749 | goto out; |
16295bec SK |
750 | } |
751 | ||
65ff577e | 752 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
753 | |
754 | out: | |
755 | mutex_unlock(&pinst->lock); | |
38228e88 | 756 | put_online_cpus(); |
16295bec SK |
757 | |
758 | return err; | |
759 | } | |
760 | EXPORT_SYMBOL(padata_set_cpumask); | |
761 | ||
19d795b6 AB |
762 | #ifdef CONFIG_HOTPLUG_CPU |
763 | ||
16295bec SK |
764 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
765 | { | |
bbefa1dd | 766 | int err = 0; |
16295bec | 767 | |
13614e0f | 768 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
894c9ef9 | 769 | err = padata_replace(pinst); |
33e54450 | 770 | |
e15bacbe DK |
771 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
772 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 773 | __padata_start(pinst); |
16295bec SK |
774 | } |
775 | ||
bbefa1dd | 776 | return err; |
16295bec SK |
777 | } |
778 | ||
16295bec SK |
779 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
780 | { | |
bbefa1dd | 781 | int err = 0; |
16295bec | 782 | |
894c9ef9 | 783 | if (!cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe | 784 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 785 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 786 | __padata_stop(pinst); |
33e54450 | 787 | |
894c9ef9 | 788 | err = padata_replace(pinst); |
16295bec SK |
789 | } |
790 | ||
bbefa1dd | 791 | return err; |
16295bec SK |
792 | } |
793 | ||
e15bacbe DK |
794 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
795 | { | |
796 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
797 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
798 | } | |
799 | ||
30e92153 | 800 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 801 | { |
16295bec | 802 | struct padata_instance *pinst; |
30e92153 | 803 | int ret; |
16295bec | 804 | |
3c2214b6 | 805 | pinst = hlist_entry_safe(node, struct padata_instance, cpu_online_node); |
30e92153 SAS |
806 | if (!pinst_has_cpu(pinst, cpu)) |
807 | return 0; | |
16295bec | 808 | |
30e92153 SAS |
809 | mutex_lock(&pinst->lock); |
810 | ret = __padata_add_cpu(pinst, cpu); | |
811 | mutex_unlock(&pinst->lock); | |
812 | return ret; | |
813 | } | |
16295bec | 814 | |
894c9ef9 | 815 | static int padata_cpu_dead(unsigned int cpu, struct hlist_node *node) |
30e92153 SAS |
816 | { |
817 | struct padata_instance *pinst; | |
818 | int ret; | |
819 | ||
3c2214b6 | 820 | pinst = hlist_entry_safe(node, struct padata_instance, cpu_dead_node); |
30e92153 SAS |
821 | if (!pinst_has_cpu(pinst, cpu)) |
822 | return 0; | |
16295bec | 823 | |
30e92153 SAS |
824 | mutex_lock(&pinst->lock); |
825 | ret = __padata_remove_cpu(pinst, cpu); | |
826 | mutex_unlock(&pinst->lock); | |
827 | return ret; | |
16295bec | 828 | } |
30e92153 SAS |
829 | |
830 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 831 | #endif |
16295bec | 832 | |
5e017dc3 DK |
833 | static void __padata_free(struct padata_instance *pinst) |
834 | { | |
835 | #ifdef CONFIG_HOTPLUG_CPU | |
3c2214b6 DJ |
836 | cpuhp_state_remove_instance_nocalls(CPUHP_PADATA_DEAD, |
837 | &pinst->cpu_dead_node); | |
838 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->cpu_online_node); | |
5e017dc3 DK |
839 | #endif |
840 | ||
bbefa1dd HX |
841 | WARN_ON(!list_empty(&pinst->pslist)); |
842 | ||
5e017dc3 DK |
843 | free_cpumask_var(pinst->cpumask.pcpu); |
844 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
845 | destroy_workqueue(pinst->serial_wq); |
846 | destroy_workqueue(pinst->parallel_wq); | |
5e017dc3 DK |
847 | kfree(pinst); |
848 | } | |
849 | ||
850 | #define kobj2pinst(_kobj) \ | |
851 | container_of(_kobj, struct padata_instance, kobj) | |
852 | #define attr2pentry(_attr) \ | |
853 | container_of(_attr, struct padata_sysfs_entry, attr) | |
854 | ||
855 | static void padata_sysfs_release(struct kobject *kobj) | |
856 | { | |
857 | struct padata_instance *pinst = kobj2pinst(kobj); | |
858 | __padata_free(pinst); | |
859 | } | |
860 | ||
861 | struct padata_sysfs_entry { | |
862 | struct attribute attr; | |
863 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
864 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
865 | const char *, size_t); | |
866 | }; | |
867 | ||
868 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
869 | struct attribute *attr, char *buf) | |
870 | { | |
871 | struct cpumask *cpumask; | |
872 | ssize_t len; | |
873 | ||
874 | mutex_lock(&pinst->lock); | |
875 | if (!strcmp(attr->name, "serial_cpumask")) | |
876 | cpumask = pinst->cpumask.cbcpu; | |
877 | else | |
878 | cpumask = pinst->cpumask.pcpu; | |
879 | ||
4497da6f TH |
880 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
881 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 882 | mutex_unlock(&pinst->lock); |
4497da6f | 883 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
884 | } |
885 | ||
886 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
887 | struct attribute *attr, | |
888 | const char *buf, size_t count) | |
889 | { | |
890 | cpumask_var_t new_cpumask; | |
891 | ssize_t ret; | |
892 | int mask_type; | |
893 | ||
894 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
895 | return -ENOMEM; | |
896 | ||
897 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
898 | nr_cpumask_bits); | |
899 | if (ret < 0) | |
900 | goto out; | |
901 | ||
902 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
903 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
904 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
905 | if (!ret) | |
906 | ret = count; | |
907 | ||
908 | out: | |
909 | free_cpumask_var(new_cpumask); | |
910 | return ret; | |
911 | } | |
912 | ||
913 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
914 | static struct padata_sysfs_entry _name##_attr = \ | |
915 | __ATTR(_name, 0644, _show_name, _store_name) | |
916 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
917 | static struct padata_sysfs_entry _name##_attr = \ | |
918 | __ATTR(_name, 0400, _show_name, NULL) | |
919 | ||
920 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
921 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
922 | ||
923 | /* | |
924 | * Padata sysfs provides the following objects: | |
925 | * serial_cpumask [RW] - cpumask for serial workers | |
926 | * parallel_cpumask [RW] - cpumask for parallel workers | |
927 | */ | |
928 | static struct attribute *padata_default_attrs[] = { | |
929 | &serial_cpumask_attr.attr, | |
930 | ¶llel_cpumask_attr.attr, | |
931 | NULL, | |
932 | }; | |
2064fbc7 | 933 | ATTRIBUTE_GROUPS(padata_default); |
5e017dc3 DK |
934 | |
935 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
936 | struct attribute *attr, char *buf) | |
937 | { | |
938 | struct padata_instance *pinst; | |
939 | struct padata_sysfs_entry *pentry; | |
940 | ssize_t ret = -EIO; | |
941 | ||
942 | pinst = kobj2pinst(kobj); | |
943 | pentry = attr2pentry(attr); | |
944 | if (pentry->show) | |
945 | ret = pentry->show(pinst, attr, buf); | |
946 | ||
947 | return ret; | |
948 | } | |
949 | ||
950 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
951 | const char *buf, size_t count) | |
952 | { | |
953 | struct padata_instance *pinst; | |
954 | struct padata_sysfs_entry *pentry; | |
955 | ssize_t ret = -EIO; | |
956 | ||
957 | pinst = kobj2pinst(kobj); | |
958 | pentry = attr2pentry(attr); | |
959 | if (pentry->show) | |
960 | ret = pentry->store(pinst, attr, buf, count); | |
961 | ||
962 | return ret; | |
963 | } | |
964 | ||
965 | static const struct sysfs_ops padata_sysfs_ops = { | |
966 | .show = padata_sysfs_show, | |
967 | .store = padata_sysfs_store, | |
968 | }; | |
969 | ||
970 | static struct kobj_type padata_attr_type = { | |
971 | .sysfs_ops = &padata_sysfs_ops, | |
2064fbc7 | 972 | .default_groups = padata_default_groups, |
5e017dc3 DK |
973 | .release = padata_sysfs_release, |
974 | }; | |
975 | ||
e15bacbe | 976 | /** |
3f257191 | 977 | * padata_alloc - allocate and initialize a padata instance |
b128a304 | 978 | * @name: used to identify the instance |
bfcdcef8 DJ |
979 | * |
980 | * Return: new instance on success, NULL on error | |
16295bec | 981 | */ |
3f257191 | 982 | struct padata_instance *padata_alloc(const char *name) |
16295bec | 983 | { |
16295bec | 984 | struct padata_instance *pinst; |
16295bec SK |
985 | |
986 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
987 | if (!pinst) | |
988 | goto err; | |
989 | ||
bfde23ce DJ |
990 | pinst->parallel_wq = alloc_workqueue("%s_parallel", WQ_UNBOUND, 0, |
991 | name); | |
45d153c0 | 992 | if (!pinst->parallel_wq) |
16295bec | 993 | goto err_free_inst; |
b128a304 | 994 | |
cc491d8e DJ |
995 | get_online_cpus(); |
996 | ||
45d153c0 DJ |
997 | pinst->serial_wq = alloc_workqueue("%s_serial", WQ_MEM_RECLAIM | |
998 | WQ_CPU_INTENSIVE, 1, name); | |
999 | if (!pinst->serial_wq) | |
cc491d8e | 1000 | goto err_put_cpus; |
45d153c0 DJ |
1001 | |
1002 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) | |
1003 | goto err_free_serial_wq; | |
e15bacbe DK |
1004 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
1005 | free_cpumask_var(pinst->cpumask.pcpu); | |
45d153c0 | 1006 | goto err_free_serial_wq; |
33e54450 | 1007 | } |
16295bec | 1008 | |
bbefa1dd | 1009 | INIT_LIST_HEAD(&pinst->pslist); |
16295bec | 1010 | |
3f257191 DJ |
1011 | cpumask_copy(pinst->cpumask.pcpu, cpu_possible_mask); |
1012 | cpumask_copy(pinst->cpumask.cbcpu, cpu_possible_mask); | |
bbefa1dd HX |
1013 | |
1014 | if (padata_setup_cpumasks(pinst)) | |
d69e037b | 1015 | goto err_free_masks; |
16295bec | 1016 | |
bd25b488 | 1017 | __padata_start(pinst); |
16295bec | 1018 | |
5e017dc3 | 1019 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1020 | mutex_init(&pinst->lock); |
1021 | ||
b8b4a416 | 1022 | #ifdef CONFIG_HOTPLUG_CPU |
3c2214b6 DJ |
1023 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, |
1024 | &pinst->cpu_online_node); | |
894c9ef9 | 1025 | cpuhp_state_add_instance_nocalls_cpuslocked(CPUHP_PADATA_DEAD, |
3c2214b6 | 1026 | &pinst->cpu_dead_node); |
b8b4a416 | 1027 | #endif |
cc491d8e DJ |
1028 | |
1029 | put_online_cpus(); | |
1030 | ||
16295bec SK |
1031 | return pinst; |
1032 | ||
e15bacbe DK |
1033 | err_free_masks: |
1034 | free_cpumask_var(pinst->cpumask.pcpu); | |
1035 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
1036 | err_free_serial_wq: |
1037 | destroy_workqueue(pinst->serial_wq); | |
cc491d8e DJ |
1038 | err_put_cpus: |
1039 | put_online_cpus(); | |
45d153c0 | 1040 | destroy_workqueue(pinst->parallel_wq); |
16295bec SK |
1041 | err_free_inst: |
1042 | kfree(pinst); | |
1043 | err: | |
1044 | return NULL; | |
1045 | } | |
3f257191 | 1046 | EXPORT_SYMBOL(padata_alloc); |
9596695e | 1047 | |
0198ffd1 | 1048 | /** |
16295bec SK |
1049 | * padata_free - free a padata instance |
1050 | * | |
bfcdcef8 | 1051 | * @pinst: padata instance to free |
16295bec SK |
1052 | */ |
1053 | void padata_free(struct padata_instance *pinst) | |
1054 | { | |
5e017dc3 | 1055 | kobject_put(&pinst->kobj); |
16295bec SK |
1056 | } |
1057 | EXPORT_SYMBOL(padata_free); | |
30e92153 | 1058 | |
bbefa1dd HX |
1059 | /** |
1060 | * padata_alloc_shell - Allocate and initialize padata shell. | |
1061 | * | |
1062 | * @pinst: Parent padata_instance object. | |
bfcdcef8 DJ |
1063 | * |
1064 | * Return: new shell on success, NULL on error | |
bbefa1dd HX |
1065 | */ |
1066 | struct padata_shell *padata_alloc_shell(struct padata_instance *pinst) | |
1067 | { | |
1068 | struct parallel_data *pd; | |
1069 | struct padata_shell *ps; | |
1070 | ||
1071 | ps = kzalloc(sizeof(*ps), GFP_KERNEL); | |
1072 | if (!ps) | |
1073 | goto out; | |
1074 | ||
1075 | ps->pinst = pinst; | |
1076 | ||
1077 | get_online_cpus(); | |
1078 | pd = padata_alloc_pd(ps); | |
1079 | put_online_cpus(); | |
1080 | ||
1081 | if (!pd) | |
1082 | goto out_free_ps; | |
1083 | ||
1084 | mutex_lock(&pinst->lock); | |
1085 | RCU_INIT_POINTER(ps->pd, pd); | |
1086 | list_add(&ps->list, &pinst->pslist); | |
1087 | mutex_unlock(&pinst->lock); | |
1088 | ||
1089 | return ps; | |
1090 | ||
1091 | out_free_ps: | |
1092 | kfree(ps); | |
1093 | out: | |
1094 | return NULL; | |
1095 | } | |
1096 | EXPORT_SYMBOL(padata_alloc_shell); | |
1097 | ||
1098 | /** | |
1099 | * padata_free_shell - free a padata shell | |
1100 | * | |
1101 | * @ps: padata shell to free | |
1102 | */ | |
1103 | void padata_free_shell(struct padata_shell *ps) | |
1104 | { | |
07b24c7c EB |
1105 | if (!ps) |
1106 | return; | |
bbefa1dd | 1107 | |
07b24c7c | 1108 | mutex_lock(&ps->pinst->lock); |
bbefa1dd HX |
1109 | list_del(&ps->list); |
1110 | padata_free_pd(rcu_dereference_protected(ps->pd, 1)); | |
07b24c7c | 1111 | mutex_unlock(&ps->pinst->lock); |
bbefa1dd HX |
1112 | |
1113 | kfree(ps); | |
1114 | } | |
1115 | EXPORT_SYMBOL(padata_free_shell); | |
1116 | ||
f1b192b1 | 1117 | void __init padata_init(void) |
30e92153 | 1118 | { |
4611ce22 | 1119 | unsigned int i, possible_cpus; |
f1b192b1 | 1120 | #ifdef CONFIG_HOTPLUG_CPU |
30e92153 SAS |
1121 | int ret; |
1122 | ||
1123 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", | |
894c9ef9 | 1124 | padata_cpu_online, NULL); |
30e92153 | 1125 | if (ret < 0) |
f1b192b1 | 1126 | goto err; |
30e92153 | 1127 | hp_online = ret; |
894c9ef9 DJ |
1128 | |
1129 | ret = cpuhp_setup_state_multi(CPUHP_PADATA_DEAD, "padata:dead", | |
1130 | NULL, padata_cpu_dead); | |
4611ce22 DJ |
1131 | if (ret < 0) |
1132 | goto remove_online_state; | |
1133 | #endif | |
1134 | ||
1135 | possible_cpus = num_possible_cpus(); | |
1136 | padata_works = kmalloc_array(possible_cpus, sizeof(struct padata_work), | |
1137 | GFP_KERNEL); | |
1138 | if (!padata_works) | |
1139 | goto remove_dead_state; | |
1140 | ||
1141 | for (i = 0; i < possible_cpus; ++i) | |
1142 | list_add(&padata_works[i].pw_list, &padata_free_works); | |
30e92153 | 1143 | |
f1b192b1 | 1144 | return; |
4611ce22 DJ |
1145 | |
1146 | remove_dead_state: | |
1147 | #ifdef CONFIG_HOTPLUG_CPU | |
1148 | cpuhp_remove_multi_state(CPUHP_PADATA_DEAD); | |
1149 | remove_online_state: | |
1150 | cpuhp_remove_multi_state(hp_online); | |
f1b192b1 | 1151 | err: |
30e92153 | 1152 | #endif |
4611ce22 | 1153 | pr_warn("padata: initialization failed\n"); |
f1b192b1 | 1154 | } |