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 | ||
bfde23ce | 49 | static int padata_cpu_hash(struct parallel_data *pd, unsigned int seq_nr) |
16295bec | 50 | { |
16295bec SK |
51 | /* |
52 | * Hash the sequence numbers to the cpus by taking | |
53 | * seq_nr mod. number of cpus in use. | |
54 | */ | |
bfde23ce | 55 | int cpu_index = seq_nr % cpumask_weight(pd->cpumask.pcpu); |
16295bec SK |
56 | |
57 | return padata_index_to_cpu(pd, cpu_index); | |
58 | } | |
59 | ||
e15bacbe | 60 | static void padata_parallel_worker(struct work_struct *parallel_work) |
16295bec | 61 | { |
e15bacbe | 62 | struct padata_parallel_queue *pqueue; |
16295bec SK |
63 | LIST_HEAD(local_list); |
64 | ||
65 | local_bh_disable(); | |
e15bacbe DK |
66 | pqueue = container_of(parallel_work, |
67 | struct padata_parallel_queue, work); | |
16295bec | 68 | |
e15bacbe DK |
69 | spin_lock(&pqueue->parallel.lock); |
70 | list_replace_init(&pqueue->parallel.list, &local_list); | |
71 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
72 | |
73 | while (!list_empty(&local_list)) { | |
74 | struct padata_priv *padata; | |
75 | ||
76 | padata = list_entry(local_list.next, | |
77 | struct padata_priv, list); | |
78 | ||
79 | list_del_init(&padata->list); | |
80 | ||
81 | padata->parallel(padata); | |
82 | } | |
83 | ||
84 | local_bh_enable(); | |
85 | } | |
86 | ||
0198ffd1 | 87 | /** |
16295bec SK |
88 | * padata_do_parallel - padata parallelization function |
89 | * | |
90 | * @pinst: padata instance | |
91 | * @padata: object to be parallelized | |
e6ce0e08 DJ |
92 | * @cb_cpu: pointer to the CPU that the serialization callback function should |
93 | * run on. If it's not in the serial cpumask of @pinst | |
94 | * (i.e. cpumask.cbcpu), this function selects a fallback CPU and if | |
95 | * none found, returns -EINVAL. | |
16295bec SK |
96 | * |
97 | * The parallelization callback function will run with BHs off. | |
98 | * Note: Every object which is parallelized by padata_do_parallel | |
99 | * must be seen by padata_do_serial. | |
100 | */ | |
101 | int padata_do_parallel(struct padata_instance *pinst, | |
e6ce0e08 | 102 | struct padata_priv *padata, int *cb_cpu) |
16295bec | 103 | { |
e6ce0e08 | 104 | int i, cpu, cpu_index, target_cpu, err; |
e15bacbe | 105 | struct padata_parallel_queue *queue; |
16295bec SK |
106 | struct parallel_data *pd; |
107 | ||
108 | rcu_read_lock_bh(); | |
109 | ||
c0e656b7 | 110 | pd = rcu_dereference_bh(pinst->pd); |
16295bec | 111 | |
83f619f3 | 112 | err = -EINVAL; |
7424713b | 113 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
114 | goto out; |
115 | ||
e6ce0e08 DJ |
116 | if (!cpumask_test_cpu(*cb_cpu, pd->cpumask.cbcpu)) { |
117 | if (!cpumask_weight(pd->cpumask.cbcpu)) | |
118 | goto out; | |
119 | ||
120 | /* Select an alternate fallback CPU and notify the caller. */ | |
121 | cpu_index = *cb_cpu % cpumask_weight(pd->cpumask.cbcpu); | |
122 | ||
123 | cpu = cpumask_first(pd->cpumask.cbcpu); | |
124 | for (i = 0; i < cpu_index; i++) | |
125 | cpu = cpumask_next(cpu, pd->cpumask.cbcpu); | |
126 | ||
127 | *cb_cpu = cpu; | |
128 | } | |
16295bec SK |
129 | |
130 | err = -EBUSY; | |
131 | if ((pinst->flags & PADATA_RESET)) | |
132 | goto out; | |
133 | ||
134 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
135 | goto out; | |
136 | ||
83f619f3 | 137 | err = 0; |
16295bec SK |
138 | atomic_inc(&pd->refcnt); |
139 | padata->pd = pd; | |
e6ce0e08 | 140 | padata->cb_cpu = *cb_cpu; |
16295bec | 141 | |
bfde23ce DJ |
142 | padata->seq_nr = atomic_inc_return(&pd->seq_nr); |
143 | target_cpu = padata_cpu_hash(pd, padata->seq_nr); | |
350ef88e | 144 | padata->cpu = target_cpu; |
e15bacbe | 145 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
146 | |
147 | spin_lock(&queue->parallel.lock); | |
148 | list_add_tail(&padata->list, &queue->parallel.list); | |
149 | spin_unlock(&queue->parallel.lock); | |
150 | ||
bfde23ce | 151 | queue_work(pinst->parallel_wq, &queue->work); |
16295bec SK |
152 | |
153 | out: | |
154 | rcu_read_unlock_bh(); | |
155 | ||
156 | return err; | |
157 | } | |
158 | EXPORT_SYMBOL(padata_do_parallel); | |
159 | ||
0198ffd1 | 160 | /* |
bfde23ce | 161 | * padata_find_next - Find the next object that needs serialization. |
0198ffd1 SK |
162 | * |
163 | * Return values are: | |
164 | * | |
165 | * A pointer to the control struct of the next object that needs | |
166 | * serialization, if present in one of the percpu reorder queues. | |
167 | * | |
bfde23ce | 168 | * NULL, if the next object that needs serialization will |
0198ffd1 SK |
169 | * be parallel processed by another cpu and is not yet present in |
170 | * the cpu's reorder queue. | |
0198ffd1 | 171 | */ |
bfde23ce DJ |
172 | static struct padata_priv *padata_find_next(struct parallel_data *pd, |
173 | bool remove_object) | |
16295bec | 174 | { |
f0fcf200 | 175 | struct padata_parallel_queue *next_queue; |
16295bec SK |
176 | struct padata_priv *padata; |
177 | struct padata_list *reorder; | |
6fc4dbcf | 178 | int cpu = pd->cpu; |
16295bec | 179 | |
e15bacbe | 180 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec SK |
181 | reorder = &next_queue->reorder; |
182 | ||
de5540d0 | 183 | spin_lock(&reorder->lock); |
bfde23ce DJ |
184 | if (list_empty(&reorder->list)) { |
185 | spin_unlock(&reorder->lock); | |
186 | return NULL; | |
187 | } | |
16295bec | 188 | |
bfde23ce | 189 | padata = list_entry(reorder->list.next, struct padata_priv, list); |
16295bec | 190 | |
bfde23ce DJ |
191 | /* |
192 | * Checks the rare case where two or more parallel jobs have hashed to | |
193 | * the same CPU and one of the later ones finishes first. | |
194 | */ | |
195 | if (padata->seq_nr != pd->processed) { | |
de5540d0 | 196 | spin_unlock(&reorder->lock); |
bfde23ce | 197 | return NULL; |
16295bec SK |
198 | } |
199 | ||
bfde23ce DJ |
200 | if (remove_object) { |
201 | list_del_init(&padata->list); | |
202 | atomic_dec(&pd->reorder_objects); | |
203 | ++pd->processed; | |
204 | pd->cpu = cpumask_next_wrap(cpu, pd->cpumask.pcpu, -1, false); | |
16295bec SK |
205 | } |
206 | ||
bfde23ce | 207 | spin_unlock(&reorder->lock); |
16295bec SK |
208 | return padata; |
209 | } | |
210 | ||
211 | static void padata_reorder(struct parallel_data *pd) | |
212 | { | |
3047817b | 213 | int cb_cpu; |
16295bec | 214 | struct padata_priv *padata; |
e15bacbe | 215 | struct padata_serial_queue *squeue; |
16295bec | 216 | struct padata_instance *pinst = pd->pinst; |
6fc4dbcf | 217 | struct padata_parallel_queue *next_queue; |
16295bec | 218 | |
0198ffd1 SK |
219 | /* |
220 | * We need to ensure that only one cpu can work on dequeueing of | |
221 | * the reorder queue the time. Calculating in which percpu reorder | |
222 | * queue the next object will arrive takes some time. A spinlock | |
223 | * would be highly contended. Also it is not clear in which order | |
224 | * the objects arrive to the reorder queues. So a cpu could wait to | |
225 | * get the lock just to notice that there is nothing to do at the | |
226 | * moment. Therefore we use a trylock and let the holder of the lock | |
227 | * care for all the objects enqueued during the holdtime of the lock. | |
228 | */ | |
16295bec | 229 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 230 | return; |
16295bec SK |
231 | |
232 | while (1) { | |
bfde23ce | 233 | padata = padata_find_next(pd, true); |
16295bec | 234 | |
0198ffd1 | 235 | /* |
69b34844 JD |
236 | * If the next object that needs serialization is parallel |
237 | * processed by another cpu and is still on it's way to the | |
238 | * cpu's reorder queue, nothing to do for now. | |
0198ffd1 | 239 | */ |
bfde23ce | 240 | if (!padata) |
16295bec SK |
241 | break; |
242 | ||
3047817b SK |
243 | cb_cpu = padata->cb_cpu; |
244 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 245 | |
e15bacbe DK |
246 | spin_lock(&squeue->serial.lock); |
247 | list_add_tail(&padata->list, &squeue->serial.list); | |
248 | spin_unlock(&squeue->serial.lock); | |
16295bec | 249 | |
45d153c0 | 250 | queue_work_on(cb_cpu, pinst->serial_wq, &squeue->work); |
16295bec SK |
251 | } |
252 | ||
253 | spin_unlock_bh(&pd->lock); | |
254 | ||
0198ffd1 SK |
255 | /* |
256 | * The next object that needs serialization might have arrived to | |
6fc4dbcf | 257 | * the reorder queues in the meantime. |
cf144f81 | 258 | * |
6fc4dbcf HX |
259 | * Ensure reorder queue is read after pd->lock is dropped so we see |
260 | * new objects from another task in padata_do_serial. Pairs with | |
cf144f81 | 261 | * smp_mb__after_atomic in padata_do_serial. |
0198ffd1 | 262 | */ |
cf144f81 | 263 | smp_mb(); |
16295bec | 264 | |
6fc4dbcf | 265 | next_queue = per_cpu_ptr(pd->pqueue, pd->cpu); |
bfde23ce DJ |
266 | if (!list_empty(&next_queue->reorder.list) && |
267 | padata_find_next(pd, false)) | |
45d153c0 | 268 | queue_work(pinst->serial_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 | { | |
065cf577 DJ |
319 | struct parallel_data *pd = padata->pd; |
320 | struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue, | |
321 | padata->cpu); | |
bfde23ce | 322 | struct padata_priv *cur; |
16295bec | 323 | |
e15bacbe | 324 | spin_lock(&pqueue->reorder.lock); |
bfde23ce DJ |
325 | /* Sort in ascending order of sequence number. */ |
326 | list_for_each_entry_reverse(cur, &pqueue->reorder.list, list) | |
327 | if (cur->seq_nr < padata->seq_nr) | |
328 | break; | |
329 | list_add(&padata->list, &cur->list); | |
6fc4dbcf | 330 | atomic_inc(&pd->reorder_objects); |
e15bacbe | 331 | spin_unlock(&pqueue->reorder.lock); |
16295bec | 332 | |
cf144f81 | 333 | /* |
6fc4dbcf | 334 | * Ensure the addition to the reorder list is ordered correctly |
cf144f81 DJ |
335 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb |
336 | * in padata_reorder. | |
337 | */ | |
338 | smp_mb__after_atomic(); | |
339 | ||
6fc4dbcf | 340 | padata_reorder(pd); |
16295bec SK |
341 | } |
342 | EXPORT_SYMBOL(padata_do_serial); | |
343 | ||
e15bacbe DK |
344 | static int padata_setup_cpumasks(struct parallel_data *pd, |
345 | const struct cpumask *pcpumask, | |
346 | const struct cpumask *cbcpumask) | |
16295bec | 347 | { |
bfde23ce DJ |
348 | struct workqueue_attrs *attrs; |
349 | int err = -ENOMEM; | |
16295bec | 350 | |
bfde23ce DJ |
351 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
352 | goto out; | |
13614e0f | 353 | cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_online_mask); |
16295bec | 354 | |
bfde23ce DJ |
355 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) |
356 | goto free_pcpu_mask; | |
13614e0f | 357 | cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_online_mask); |
bfde23ce DJ |
358 | |
359 | attrs = alloc_workqueue_attrs(); | |
360 | if (!attrs) | |
361 | goto free_cbcpu_mask; | |
362 | ||
363 | /* Restrict parallel_wq workers to pd->cpumask.pcpu. */ | |
364 | cpumask_copy(attrs->cpumask, pd->cpumask.pcpu); | |
365 | err = apply_workqueue_attrs(pd->pinst->parallel_wq, attrs); | |
366 | free_workqueue_attrs(attrs); | |
367 | if (err < 0) | |
368 | goto free_cbcpu_mask; | |
369 | ||
e15bacbe | 370 | return 0; |
bfde23ce DJ |
371 | |
372 | free_cbcpu_mask: | |
373 | free_cpumask_var(pd->cpumask.cbcpu); | |
374 | free_pcpu_mask: | |
375 | free_cpumask_var(pd->cpumask.pcpu); | |
376 | out: | |
377 | return err; | |
e15bacbe | 378 | } |
16295bec | 379 | |
e15bacbe DK |
380 | static void __padata_list_init(struct padata_list *pd_list) |
381 | { | |
382 | INIT_LIST_HEAD(&pd_list->list); | |
383 | spin_lock_init(&pd_list->lock); | |
384 | } | |
16295bec | 385 | |
e15bacbe DK |
386 | /* Initialize all percpu queues used by serial workers */ |
387 | static void padata_init_squeues(struct parallel_data *pd) | |
388 | { | |
389 | int cpu; | |
390 | struct padata_serial_queue *squeue; | |
7b389b2c | 391 | |
e15bacbe DK |
392 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
393 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
394 | squeue->pd = pd; | |
395 | __padata_list_init(&squeue->serial); | |
396 | INIT_WORK(&squeue->work, padata_serial_worker); | |
397 | } | |
398 | } | |
16295bec | 399 | |
e15bacbe DK |
400 | /* Initialize all percpu queues used by parallel workers */ |
401 | static void padata_init_pqueues(struct parallel_data *pd) | |
402 | { | |
2dc9b5db | 403 | int cpu_index, cpu; |
e15bacbe | 404 | struct padata_parallel_queue *pqueue; |
16295bec | 405 | |
e15bacbe | 406 | cpu_index = 0; |
1bd845bc | 407 | for_each_possible_cpu(cpu) { |
e15bacbe | 408 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
1bd845bc MK |
409 | |
410 | if (!cpumask_test_cpu(cpu, pd->cpumask.pcpu)) { | |
411 | pqueue->cpu_index = -1; | |
412 | continue; | |
413 | } | |
414 | ||
e15bacbe | 415 | pqueue->cpu_index = cpu_index; |
7b389b2c | 416 | cpu_index++; |
16295bec | 417 | |
e15bacbe DK |
418 | __padata_list_init(&pqueue->reorder); |
419 | __padata_list_init(&pqueue->parallel); | |
420 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
421 | atomic_set(&pqueue->num_obj, 0); | |
16295bec | 422 | } |
e15bacbe | 423 | } |
16295bec | 424 | |
e15bacbe DK |
425 | /* Allocate and initialize the internal cpumask dependend resources. */ |
426 | static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, | |
427 | const struct cpumask *pcpumask, | |
428 | const struct cpumask *cbcpumask) | |
429 | { | |
430 | struct parallel_data *pd; | |
16295bec | 431 | |
e15bacbe DK |
432 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
433 | if (!pd) | |
434 | goto err; | |
16295bec | 435 | |
e15bacbe DK |
436 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
437 | if (!pd->pqueue) | |
438 | goto err_free_pd; | |
439 | ||
440 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
441 | if (!pd->squeue) | |
442 | goto err_free_pqueue; | |
bfde23ce DJ |
443 | |
444 | pd->pinst = pinst; | |
e15bacbe DK |
445 | if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0) |
446 | goto err_free_squeue; | |
16295bec | 447 | |
e15bacbe DK |
448 | padata_init_pqueues(pd); |
449 | padata_init_squeues(pd); | |
0b6b098e | 450 | atomic_set(&pd->seq_nr, -1); |
16295bec SK |
451 | atomic_set(&pd->reorder_objects, 0); |
452 | atomic_set(&pd->refcnt, 0); | |
16295bec | 453 | spin_lock_init(&pd->lock); |
ec9c7d19 | 454 | pd->cpu = cpumask_first(pd->cpumask.pcpu); |
6fc4dbcf | 455 | INIT_WORK(&pd->reorder_work, invoke_padata_reorder); |
16295bec SK |
456 | |
457 | return pd; | |
458 | ||
e15bacbe DK |
459 | err_free_squeue: |
460 | free_percpu(pd->squeue); | |
461 | err_free_pqueue: | |
462 | free_percpu(pd->pqueue); | |
16295bec SK |
463 | err_free_pd: |
464 | kfree(pd); | |
465 | err: | |
466 | return NULL; | |
467 | } | |
468 | ||
469 | static void padata_free_pd(struct parallel_data *pd) | |
470 | { | |
e15bacbe DK |
471 | free_cpumask_var(pd->cpumask.pcpu); |
472 | free_cpumask_var(pd->cpumask.cbcpu); | |
473 | free_percpu(pd->pqueue); | |
474 | free_percpu(pd->squeue); | |
16295bec SK |
475 | kfree(pd); |
476 | } | |
477 | ||
0198ffd1 | 478 | /* Flush all objects out of the padata queues. */ |
2b73b07a SK |
479 | static void padata_flush_queues(struct parallel_data *pd) |
480 | { | |
481 | int cpu; | |
e15bacbe DK |
482 | struct padata_parallel_queue *pqueue; |
483 | struct padata_serial_queue *squeue; | |
2b73b07a | 484 | |
e15bacbe DK |
485 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
486 | pqueue = per_cpu_ptr(pd->pqueue, cpu); | |
487 | flush_work(&pqueue->work); | |
2b73b07a SK |
488 | } |
489 | ||
2b73b07a SK |
490 | if (atomic_read(&pd->reorder_objects)) |
491 | padata_reorder(pd); | |
492 | ||
e15bacbe DK |
493 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
494 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
495 | flush_work(&squeue->work); | |
2b73b07a SK |
496 | } |
497 | ||
498 | BUG_ON(atomic_read(&pd->refcnt) != 0); | |
499 | } | |
500 | ||
4c879170 SK |
501 | static void __padata_start(struct padata_instance *pinst) |
502 | { | |
503 | pinst->flags |= PADATA_INIT; | |
504 | } | |
505 | ||
ee836555 SK |
506 | static void __padata_stop(struct padata_instance *pinst) |
507 | { | |
508 | if (!(pinst->flags & PADATA_INIT)) | |
509 | return; | |
510 | ||
511 | pinst->flags &= ~PADATA_INIT; | |
512 | ||
513 | synchronize_rcu(); | |
514 | ||
515 | get_online_cpus(); | |
516 | padata_flush_queues(pinst->pd); | |
517 | put_online_cpus(); | |
518 | } | |
519 | ||
25985edc | 520 | /* Replace the internal control structure with a new one. */ |
16295bec SK |
521 | static void padata_replace(struct padata_instance *pinst, |
522 | struct parallel_data *pd_new) | |
523 | { | |
524 | struct parallel_data *pd_old = pinst->pd; | |
e15bacbe | 525 | int notification_mask = 0; |
16295bec SK |
526 | |
527 | pinst->flags |= PADATA_RESET; | |
528 | ||
529 | rcu_assign_pointer(pinst->pd, pd_new); | |
530 | ||
531 | synchronize_rcu(); | |
532 | ||
e15bacbe DK |
533 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) |
534 | notification_mask |= PADATA_CPU_PARALLEL; | |
535 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) | |
536 | notification_mask |= PADATA_CPU_SERIAL; | |
537 | ||
2b73b07a | 538 | padata_flush_queues(pd_old); |
16295bec SK |
539 | padata_free_pd(pd_old); |
540 | ||
e15bacbe DK |
541 | if (notification_mask) |
542 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
c635696c SK |
543 | notification_mask, |
544 | &pd_new->cpumask); | |
16295bec SK |
545 | |
546 | pinst->flags &= ~PADATA_RESET; | |
547 | } | |
548 | ||
0198ffd1 | 549 | /** |
e15bacbe DK |
550 | * padata_register_cpumask_notifier - Registers a notifier that will be called |
551 | * if either pcpu or cbcpu or both cpumasks change. | |
16295bec | 552 | * |
e15bacbe DK |
553 | * @pinst: A poineter to padata instance |
554 | * @nblock: A pointer to notifier block. | |
16295bec | 555 | */ |
e15bacbe DK |
556 | int padata_register_cpumask_notifier(struct padata_instance *pinst, |
557 | struct notifier_block *nblock) | |
16295bec | 558 | { |
e15bacbe DK |
559 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, |
560 | nblock); | |
561 | } | |
562 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
563 | ||
564 | /** | |
565 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
566 | * registered earlier using padata_register_cpumask_notifier | |
567 | * | |
568 | * @pinst: A pointer to data instance. | |
569 | * @nlock: A pointer to notifier block. | |
570 | */ | |
571 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
572 | struct notifier_block *nblock) | |
573 | { | |
574 | return blocking_notifier_chain_unregister( | |
575 | &pinst->cpumask_change_notifier, | |
576 | nblock); | |
577 | } | |
578 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
579 | ||
580 | ||
33e54450 SK |
581 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
582 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
583 | const struct cpumask *cpumask) | |
584 | { | |
13614e0f | 585 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
586 | pinst->flags |= PADATA_INVALID; |
587 | return false; | |
588 | } | |
589 | ||
590 | pinst->flags &= ~PADATA_INVALID; | |
591 | return true; | |
592 | } | |
593 | ||
65ff577e SK |
594 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
595 | cpumask_var_t pcpumask, | |
596 | cpumask_var_t cbcpumask) | |
597 | { | |
598 | int valid; | |
16295bec | 599 | struct parallel_data *pd; |
65ff577e SK |
600 | |
601 | valid = padata_validate_cpumask(pinst, pcpumask); | |
602 | if (!valid) { | |
603 | __padata_stop(pinst); | |
604 | goto out_replace; | |
605 | } | |
606 | ||
607 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
608 | if (!valid) | |
609 | __padata_stop(pinst); | |
610 | ||
611 | out_replace: | |
612 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); | |
613 | if (!pd) | |
614 | return -ENOMEM; | |
615 | ||
616 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); | |
617 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
618 | ||
619 | padata_replace(pinst, pd); | |
620 | ||
621 | if (valid) | |
622 | __padata_start(pinst); | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
e15bacbe DK |
627 | /** |
628 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
629 | * equivalent to @cpumask. | |
16295bec SK |
630 | * |
631 | * @pinst: padata instance | |
e15bacbe DK |
632 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
633 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
634 | * @cpumask: the cpumask to use |
635 | */ | |
e15bacbe DK |
636 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
637 | cpumask_var_t cpumask) | |
638 | { | |
639 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
640 | int err = -EINVAL; |
641 | ||
642 | mutex_lock(&pinst->lock); | |
6751fb3c SK |
643 | get_online_cpus(); |
644 | ||
e15bacbe DK |
645 | switch (cpumask_type) { |
646 | case PADATA_CPU_PARALLEL: | |
647 | serial_mask = pinst->cpumask.cbcpu; | |
648 | parallel_mask = cpumask; | |
649 | break; | |
650 | case PADATA_CPU_SERIAL: | |
651 | parallel_mask = pinst->cpumask.pcpu; | |
652 | serial_mask = cpumask; | |
653 | break; | |
654 | default: | |
65ff577e | 655 | goto out; |
16295bec SK |
656 | } |
657 | ||
65ff577e | 658 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
659 | |
660 | out: | |
6751fb3c | 661 | put_online_cpus(); |
16295bec SK |
662 | mutex_unlock(&pinst->lock); |
663 | ||
664 | return err; | |
665 | } | |
666 | EXPORT_SYMBOL(padata_set_cpumask); | |
667 | ||
19d795b6 AB |
668 | /** |
669 | * padata_start - start the parallel processing | |
670 | * | |
671 | * @pinst: padata instance to start | |
672 | */ | |
673 | int padata_start(struct padata_instance *pinst) | |
674 | { | |
675 | int err = 0; | |
676 | ||
677 | mutex_lock(&pinst->lock); | |
678 | ||
679 | if (pinst->flags & PADATA_INVALID) | |
680 | err = -EINVAL; | |
681 | ||
8ddab428 | 682 | __padata_start(pinst); |
19d795b6 AB |
683 | |
684 | mutex_unlock(&pinst->lock); | |
685 | ||
686 | return err; | |
687 | } | |
688 | EXPORT_SYMBOL(padata_start); | |
689 | ||
690 | /** | |
691 | * padata_stop - stop the parallel processing | |
692 | * | |
693 | * @pinst: padata instance to stop | |
694 | */ | |
695 | void padata_stop(struct padata_instance *pinst) | |
696 | { | |
697 | mutex_lock(&pinst->lock); | |
698 | __padata_stop(pinst); | |
699 | mutex_unlock(&pinst->lock); | |
700 | } | |
701 | EXPORT_SYMBOL(padata_stop); | |
702 | ||
703 | #ifdef CONFIG_HOTPLUG_CPU | |
704 | ||
16295bec SK |
705 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
706 | { | |
707 | struct parallel_data *pd; | |
708 | ||
13614e0f | 709 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe DK |
710 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
711 | pinst->cpumask.cbcpu); | |
16295bec SK |
712 | if (!pd) |
713 | return -ENOMEM; | |
714 | ||
715 | padata_replace(pinst, pd); | |
33e54450 | 716 | |
e15bacbe DK |
717 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
718 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 719 | __padata_start(pinst); |
16295bec SK |
720 | } |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
16295bec SK |
725 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
726 | { | |
33e54450 | 727 | struct parallel_data *pd = NULL; |
16295bec SK |
728 | |
729 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { | |
33e54450 | 730 | |
e15bacbe | 731 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 732 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 733 | __padata_stop(pinst); |
33e54450 | 734 | |
e15bacbe DK |
735 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
736 | pinst->cpumask.cbcpu); | |
16295bec SK |
737 | if (!pd) |
738 | return -ENOMEM; | |
739 | ||
740 | padata_replace(pinst, pd); | |
96120905 SK |
741 | |
742 | cpumask_clear_cpu(cpu, pd->cpumask.cbcpu); | |
743 | cpumask_clear_cpu(cpu, pd->cpumask.pcpu); | |
16295bec SK |
744 | } |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
e15bacbe | 749 | /** |
25985edc | 750 | * padata_remove_cpu - remove a cpu from the one or both(serial and parallel) |
e15bacbe | 751 | * padata cpumasks. |
16295bec SK |
752 | * |
753 | * @pinst: padata instance | |
754 | * @cpu: cpu to remove | |
e15bacbe DK |
755 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
756 | * The @mask may be any combination of the following flags: | |
757 | * PADATA_CPU_SERIAL - serial cpumask | |
758 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 759 | */ |
e15bacbe | 760 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
761 | { |
762 | int err; | |
763 | ||
e15bacbe DK |
764 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
765 | return -EINVAL; | |
766 | ||
16295bec SK |
767 | mutex_lock(&pinst->lock); |
768 | ||
6751fb3c | 769 | get_online_cpus(); |
e15bacbe DK |
770 | if (mask & PADATA_CPU_SERIAL) |
771 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
772 | if (mask & PADATA_CPU_PARALLEL) | |
773 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
774 | ||
16295bec | 775 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 776 | put_online_cpus(); |
16295bec SK |
777 | |
778 | mutex_unlock(&pinst->lock); | |
779 | ||
780 | return err; | |
781 | } | |
782 | EXPORT_SYMBOL(padata_remove_cpu); | |
783 | ||
e15bacbe DK |
784 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
785 | { | |
786 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
787 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
788 | } | |
789 | ||
30e92153 | 790 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 791 | { |
16295bec | 792 | struct padata_instance *pinst; |
30e92153 | 793 | int ret; |
16295bec | 794 | |
30e92153 SAS |
795 | pinst = hlist_entry_safe(node, struct padata_instance, node); |
796 | if (!pinst_has_cpu(pinst, cpu)) | |
797 | return 0; | |
16295bec | 798 | |
30e92153 SAS |
799 | mutex_lock(&pinst->lock); |
800 | ret = __padata_add_cpu(pinst, cpu); | |
801 | mutex_unlock(&pinst->lock); | |
802 | return ret; | |
803 | } | |
16295bec | 804 | |
30e92153 SAS |
805 | static int padata_cpu_prep_down(unsigned int cpu, struct hlist_node *node) |
806 | { | |
807 | struct padata_instance *pinst; | |
808 | int ret; | |
809 | ||
810 | pinst = hlist_entry_safe(node, struct padata_instance, node); | |
811 | if (!pinst_has_cpu(pinst, cpu)) | |
812 | return 0; | |
16295bec | 813 | |
30e92153 SAS |
814 | mutex_lock(&pinst->lock); |
815 | ret = __padata_remove_cpu(pinst, cpu); | |
816 | mutex_unlock(&pinst->lock); | |
817 | return ret; | |
16295bec | 818 | } |
30e92153 SAS |
819 | |
820 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 821 | #endif |
16295bec | 822 | |
5e017dc3 DK |
823 | static void __padata_free(struct padata_instance *pinst) |
824 | { | |
825 | #ifdef CONFIG_HOTPLUG_CPU | |
30e92153 | 826 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node); |
5e017dc3 DK |
827 | #endif |
828 | ||
829 | padata_stop(pinst); | |
830 | padata_free_pd(pinst->pd); | |
831 | free_cpumask_var(pinst->cpumask.pcpu); | |
832 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
833 | destroy_workqueue(pinst->serial_wq); |
834 | destroy_workqueue(pinst->parallel_wq); | |
5e017dc3 DK |
835 | kfree(pinst); |
836 | } | |
837 | ||
838 | #define kobj2pinst(_kobj) \ | |
839 | container_of(_kobj, struct padata_instance, kobj) | |
840 | #define attr2pentry(_attr) \ | |
841 | container_of(_attr, struct padata_sysfs_entry, attr) | |
842 | ||
843 | static void padata_sysfs_release(struct kobject *kobj) | |
844 | { | |
845 | struct padata_instance *pinst = kobj2pinst(kobj); | |
846 | __padata_free(pinst); | |
847 | } | |
848 | ||
849 | struct padata_sysfs_entry { | |
850 | struct attribute attr; | |
851 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
852 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
853 | const char *, size_t); | |
854 | }; | |
855 | ||
856 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
857 | struct attribute *attr, char *buf) | |
858 | { | |
859 | struct cpumask *cpumask; | |
860 | ssize_t len; | |
861 | ||
862 | mutex_lock(&pinst->lock); | |
863 | if (!strcmp(attr->name, "serial_cpumask")) | |
864 | cpumask = pinst->cpumask.cbcpu; | |
865 | else | |
866 | cpumask = pinst->cpumask.pcpu; | |
867 | ||
4497da6f TH |
868 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
869 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 870 | mutex_unlock(&pinst->lock); |
4497da6f | 871 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
872 | } |
873 | ||
874 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
875 | struct attribute *attr, | |
876 | const char *buf, size_t count) | |
877 | { | |
878 | cpumask_var_t new_cpumask; | |
879 | ssize_t ret; | |
880 | int mask_type; | |
881 | ||
882 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
883 | return -ENOMEM; | |
884 | ||
885 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
886 | nr_cpumask_bits); | |
887 | if (ret < 0) | |
888 | goto out; | |
889 | ||
890 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
891 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
892 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
893 | if (!ret) | |
894 | ret = count; | |
895 | ||
896 | out: | |
897 | free_cpumask_var(new_cpumask); | |
898 | return ret; | |
899 | } | |
900 | ||
901 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
902 | static struct padata_sysfs_entry _name##_attr = \ | |
903 | __ATTR(_name, 0644, _show_name, _store_name) | |
904 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
905 | static struct padata_sysfs_entry _name##_attr = \ | |
906 | __ATTR(_name, 0400, _show_name, NULL) | |
907 | ||
908 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
909 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
910 | ||
911 | /* | |
912 | * Padata sysfs provides the following objects: | |
913 | * serial_cpumask [RW] - cpumask for serial workers | |
914 | * parallel_cpumask [RW] - cpumask for parallel workers | |
915 | */ | |
916 | static struct attribute *padata_default_attrs[] = { | |
917 | &serial_cpumask_attr.attr, | |
918 | ¶llel_cpumask_attr.attr, | |
919 | NULL, | |
920 | }; | |
2064fbc7 | 921 | ATTRIBUTE_GROUPS(padata_default); |
5e017dc3 DK |
922 | |
923 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
924 | struct attribute *attr, char *buf) | |
925 | { | |
926 | struct padata_instance *pinst; | |
927 | struct padata_sysfs_entry *pentry; | |
928 | ssize_t ret = -EIO; | |
929 | ||
930 | pinst = kobj2pinst(kobj); | |
931 | pentry = attr2pentry(attr); | |
932 | if (pentry->show) | |
933 | ret = pentry->show(pinst, attr, buf); | |
934 | ||
935 | return ret; | |
936 | } | |
937 | ||
938 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
939 | const char *buf, size_t count) | |
940 | { | |
941 | struct padata_instance *pinst; | |
942 | struct padata_sysfs_entry *pentry; | |
943 | ssize_t ret = -EIO; | |
944 | ||
945 | pinst = kobj2pinst(kobj); | |
946 | pentry = attr2pentry(attr); | |
947 | if (pentry->show) | |
948 | ret = pentry->store(pinst, attr, buf, count); | |
949 | ||
950 | return ret; | |
951 | } | |
952 | ||
953 | static const struct sysfs_ops padata_sysfs_ops = { | |
954 | .show = padata_sysfs_show, | |
955 | .store = padata_sysfs_store, | |
956 | }; | |
957 | ||
958 | static struct kobj_type padata_attr_type = { | |
959 | .sysfs_ops = &padata_sysfs_ops, | |
2064fbc7 | 960 | .default_groups = padata_default_groups, |
5e017dc3 DK |
961 | .release = padata_sysfs_release, |
962 | }; | |
963 | ||
e15bacbe | 964 | /** |
e6cc1170 SK |
965 | * padata_alloc - allocate and initialize a padata instance and specify |
966 | * cpumasks for serial and parallel workers. | |
16295bec | 967 | * |
b128a304 | 968 | * @name: used to identify the instance |
e15bacbe DK |
969 | * @pcpumask: cpumask that will be used for padata parallelization |
970 | * @cbcpumask: cpumask that will be used for padata serialization | |
16295bec | 971 | */ |
b128a304 | 972 | static struct padata_instance *padata_alloc(const char *name, |
9596695e TG |
973 | const struct cpumask *pcpumask, |
974 | const struct cpumask *cbcpumask) | |
16295bec | 975 | { |
16295bec | 976 | struct padata_instance *pinst; |
33e54450 | 977 | struct parallel_data *pd = NULL; |
16295bec SK |
978 | |
979 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
980 | if (!pinst) | |
981 | goto err; | |
982 | ||
bfde23ce DJ |
983 | pinst->parallel_wq = alloc_workqueue("%s_parallel", WQ_UNBOUND, 0, |
984 | name); | |
45d153c0 | 985 | if (!pinst->parallel_wq) |
16295bec | 986 | goto err_free_inst; |
b128a304 | 987 | |
cc491d8e DJ |
988 | get_online_cpus(); |
989 | ||
45d153c0 DJ |
990 | pinst->serial_wq = alloc_workqueue("%s_serial", WQ_MEM_RECLAIM | |
991 | WQ_CPU_INTENSIVE, 1, name); | |
992 | if (!pinst->serial_wq) | |
cc491d8e | 993 | goto err_put_cpus; |
45d153c0 DJ |
994 | |
995 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) | |
996 | goto err_free_serial_wq; | |
e15bacbe DK |
997 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
998 | free_cpumask_var(pinst->cpumask.pcpu); | |
45d153c0 | 999 | goto err_free_serial_wq; |
33e54450 | 1000 | } |
e15bacbe DK |
1001 | if (!padata_validate_cpumask(pinst, pcpumask) || |
1002 | !padata_validate_cpumask(pinst, cbcpumask)) | |
1003 | goto err_free_masks; | |
16295bec | 1004 | |
e15bacbe DK |
1005 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
1006 | if (!pd) | |
1007 | goto err_free_masks; | |
74781387 | 1008 | |
16295bec SK |
1009 | rcu_assign_pointer(pinst->pd, pd); |
1010 | ||
e15bacbe DK |
1011 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
1012 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
1013 | |
1014 | pinst->flags = 0; | |
1015 | ||
e15bacbe | 1016 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 1017 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1018 | mutex_init(&pinst->lock); |
1019 | ||
b8b4a416 | 1020 | #ifdef CONFIG_HOTPLUG_CPU |
c5a81c8f | 1021 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node); |
b8b4a416 | 1022 | #endif |
cc491d8e DJ |
1023 | |
1024 | put_online_cpus(); | |
1025 | ||
16295bec SK |
1026 | return pinst; |
1027 | ||
e15bacbe DK |
1028 | err_free_masks: |
1029 | free_cpumask_var(pinst->cpumask.pcpu); | |
1030 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
1031 | err_free_serial_wq: |
1032 | destroy_workqueue(pinst->serial_wq); | |
cc491d8e DJ |
1033 | err_put_cpus: |
1034 | put_online_cpus(); | |
45d153c0 | 1035 | destroy_workqueue(pinst->parallel_wq); |
16295bec SK |
1036 | err_free_inst: |
1037 | kfree(pinst); | |
1038 | err: | |
1039 | return NULL; | |
1040 | } | |
16295bec | 1041 | |
9596695e TG |
1042 | /** |
1043 | * padata_alloc_possible - Allocate and initialize padata instance. | |
1044 | * Use the cpu_possible_mask for serial and | |
1045 | * parallel workers. | |
1046 | * | |
b128a304 | 1047 | * @name: used to identify the instance |
9596695e | 1048 | */ |
b128a304 | 1049 | struct padata_instance *padata_alloc_possible(const char *name) |
9596695e | 1050 | { |
b128a304 | 1051 | return padata_alloc(name, cpu_possible_mask, cpu_possible_mask); |
9596695e TG |
1052 | } |
1053 | EXPORT_SYMBOL(padata_alloc_possible); | |
1054 | ||
0198ffd1 | 1055 | /** |
16295bec SK |
1056 | * padata_free - free a padata instance |
1057 | * | |
0198ffd1 | 1058 | * @padata_inst: padata instance to free |
16295bec SK |
1059 | */ |
1060 | void padata_free(struct padata_instance *pinst) | |
1061 | { | |
5e017dc3 | 1062 | kobject_put(&pinst->kobj); |
16295bec SK |
1063 | } |
1064 | EXPORT_SYMBOL(padata_free); | |
30e92153 SAS |
1065 | |
1066 | #ifdef CONFIG_HOTPLUG_CPU | |
1067 | ||
1068 | static __init int padata_driver_init(void) | |
1069 | { | |
1070 | int ret; | |
1071 | ||
1072 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", | |
1073 | padata_cpu_online, | |
1074 | padata_cpu_prep_down); | |
1075 | if (ret < 0) | |
1076 | return ret; | |
1077 | hp_online = ret; | |
1078 | return 0; | |
1079 | } | |
1080 | module_init(padata_driver_init); | |
1081 | ||
1082 | static __exit void padata_driver_exit(void) | |
1083 | { | |
1084 | cpuhp_remove_multi_state(hp_online); | |
1085 | } | |
1086 | module_exit(padata_driver_exit); | |
1087 | #endif |