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16295bec SK |
1 | /* |
2 | * padata.c - generic interface to process data streams in parallel | |
3 | * | |
4 | * Copyright (C) 2008, 2009 secunet Security Networks AG | |
5 | * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/cpumask.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/cpu.h> | |
25 | #include <linux/padata.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/sched.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
5e017dc3 | 29 | #include <linux/sysfs.h> |
16295bec SK |
30 | #include <linux/rcupdate.h> |
31 | ||
749d811f | 32 | #define MAX_SEQ_NR (INT_MAX - NR_CPUS) |
97e3d94a | 33 | #define MAX_OBJ_NUM 1000 |
16295bec SK |
34 | |
35 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) | |
36 | { | |
37 | int cpu, target_cpu; | |
38 | ||
e15bacbe | 39 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
16295bec | 40 | for (cpu = 0; cpu < cpu_index; cpu++) |
e15bacbe | 41 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
16295bec SK |
42 | |
43 | return target_cpu; | |
44 | } | |
45 | ||
46 | static int padata_cpu_hash(struct padata_priv *padata) | |
47 | { | |
48 | int cpu_index; | |
49 | struct parallel_data *pd; | |
50 | ||
51 | pd = padata->pd; | |
52 | ||
53 | /* | |
54 | * Hash the sequence numbers to the cpus by taking | |
55 | * seq_nr mod. number of cpus in use. | |
56 | */ | |
e15bacbe | 57 | cpu_index = padata->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 | struct parallel_data *pd; |
66 | struct padata_instance *pinst; | |
67 | LIST_HEAD(local_list); | |
68 | ||
69 | local_bh_disable(); | |
e15bacbe DK |
70 | pqueue = container_of(parallel_work, |
71 | struct padata_parallel_queue, work); | |
72 | pd = pqueue->pd; | |
16295bec SK |
73 | pinst = pd->pinst; |
74 | ||
e15bacbe DK |
75 | spin_lock(&pqueue->parallel.lock); |
76 | list_replace_init(&pqueue->parallel.list, &local_list); | |
77 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
78 | |
79 | while (!list_empty(&local_list)) { | |
80 | struct padata_priv *padata; | |
81 | ||
82 | padata = list_entry(local_list.next, | |
83 | struct padata_priv, list); | |
84 | ||
85 | list_del_init(&padata->list); | |
86 | ||
87 | padata->parallel(padata); | |
88 | } | |
89 | ||
90 | local_bh_enable(); | |
91 | } | |
92 | ||
0198ffd1 | 93 | /** |
16295bec SK |
94 | * padata_do_parallel - padata parallelization function |
95 | * | |
96 | * @pinst: padata instance | |
97 | * @padata: object to be parallelized | |
98 | * @cb_cpu: cpu the serialization callback function will run on, | |
e15bacbe | 99 | * must be in the serial cpumask of padata(i.e. cpumask.cbcpu). |
16295bec SK |
100 | * |
101 | * The parallelization callback function will run with BHs off. | |
102 | * Note: Every object which is parallelized by padata_do_parallel | |
103 | * must be seen by padata_do_serial. | |
104 | */ | |
105 | int padata_do_parallel(struct padata_instance *pinst, | |
106 | struct padata_priv *padata, int cb_cpu) | |
107 | { | |
108 | int target_cpu, err; | |
e15bacbe | 109 | struct padata_parallel_queue *queue; |
16295bec SK |
110 | struct parallel_data *pd; |
111 | ||
112 | rcu_read_lock_bh(); | |
113 | ||
114 | pd = rcu_dereference(pinst->pd); | |
115 | ||
83f619f3 | 116 | err = -EINVAL; |
16295bec SK |
117 | if (!(pinst->flags & PADATA_INIT)) |
118 | goto out; | |
119 | ||
e15bacbe | 120 | if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu)) |
83f619f3 SK |
121 | goto out; |
122 | ||
16295bec SK |
123 | err = -EBUSY; |
124 | if ((pinst->flags & PADATA_RESET)) | |
125 | goto out; | |
126 | ||
127 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
128 | goto out; | |
129 | ||
83f619f3 | 130 | err = 0; |
16295bec SK |
131 | atomic_inc(&pd->refcnt); |
132 | padata->pd = pd; | |
133 | padata->cb_cpu = cb_cpu; | |
134 | ||
135 | if (unlikely(atomic_read(&pd->seq_nr) == pd->max_seq_nr)) | |
136 | atomic_set(&pd->seq_nr, -1); | |
137 | ||
138 | padata->seq_nr = atomic_inc_return(&pd->seq_nr); | |
139 | ||
140 | target_cpu = padata_cpu_hash(padata); | |
e15bacbe | 141 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
142 | |
143 | spin_lock(&queue->parallel.lock); | |
144 | list_add_tail(&padata->list, &queue->parallel.list); | |
145 | spin_unlock(&queue->parallel.lock); | |
146 | ||
e15bacbe | 147 | queue_work_on(target_cpu, pinst->wq, &queue->work); |
16295bec SK |
148 | |
149 | out: | |
150 | rcu_read_unlock_bh(); | |
151 | ||
152 | return err; | |
153 | } | |
154 | EXPORT_SYMBOL(padata_do_parallel); | |
155 | ||
0198ffd1 SK |
156 | /* |
157 | * padata_get_next - Get the next object that needs serialization. | |
158 | * | |
159 | * Return values are: | |
160 | * | |
161 | * A pointer to the control struct of the next object that needs | |
162 | * serialization, if present in one of the percpu reorder queues. | |
163 | * | |
164 | * NULL, if all percpu reorder queues are empty. | |
165 | * | |
166 | * -EINPROGRESS, if the next object that needs serialization will | |
167 | * be parallel processed by another cpu and is not yet present in | |
168 | * the cpu's reorder queue. | |
169 | * | |
170 | * -ENODATA, if this cpu has to do the parallel processing for | |
171 | * the next object. | |
172 | */ | |
16295bec SK |
173 | static struct padata_priv *padata_get_next(struct parallel_data *pd) |
174 | { | |
5f1a8c1b SK |
175 | int cpu, num_cpus; |
176 | int next_nr, next_index; | |
e15bacbe | 177 | struct padata_parallel_queue *queue, *next_queue; |
16295bec SK |
178 | struct padata_priv *padata; |
179 | struct padata_list *reorder; | |
180 | ||
e15bacbe | 181 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
16295bec | 182 | |
5f1a8c1b SK |
183 | /* |
184 | * Calculate the percpu reorder queue and the sequence | |
185 | * number of the next object. | |
186 | */ | |
187 | next_nr = pd->processed; | |
188 | next_index = next_nr % num_cpus; | |
189 | cpu = padata_index_to_cpu(pd, next_index); | |
e15bacbe | 190 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
5f1a8c1b SK |
191 | |
192 | if (unlikely(next_nr > pd->max_seq_nr)) { | |
193 | next_nr = next_nr - pd->max_seq_nr - 1; | |
194 | next_index = next_nr % num_cpus; | |
195 | cpu = padata_index_to_cpu(pd, next_index); | |
e15bacbe | 196 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
5f1a8c1b | 197 | pd->processed = 0; |
16295bec SK |
198 | } |
199 | ||
200 | padata = NULL; | |
201 | ||
16295bec SK |
202 | reorder = &next_queue->reorder; |
203 | ||
204 | if (!list_empty(&reorder->list)) { | |
205 | padata = list_entry(reorder->list.next, | |
206 | struct padata_priv, list); | |
207 | ||
5f1a8c1b | 208 | BUG_ON(next_nr != padata->seq_nr); |
16295bec SK |
209 | |
210 | spin_lock(&reorder->lock); | |
211 | list_del_init(&padata->list); | |
212 | atomic_dec(&pd->reorder_objects); | |
213 | spin_unlock(&reorder->lock); | |
214 | ||
5f1a8c1b | 215 | pd->processed++; |
16295bec SK |
216 | |
217 | goto out; | |
218 | } | |
219 | ||
e15bacbe | 220 | queue = per_cpu_ptr(pd->pqueue, smp_processor_id()); |
d46a5ac7 | 221 | if (queue->cpu_index == next_queue->cpu_index) { |
16295bec SK |
222 | padata = ERR_PTR(-ENODATA); |
223 | goto out; | |
224 | } | |
225 | ||
226 | padata = ERR_PTR(-EINPROGRESS); | |
227 | out: | |
228 | return padata; | |
229 | } | |
230 | ||
231 | static void padata_reorder(struct parallel_data *pd) | |
232 | { | |
233 | struct padata_priv *padata; | |
e15bacbe | 234 | struct padata_serial_queue *squeue; |
16295bec SK |
235 | struct padata_instance *pinst = pd->pinst; |
236 | ||
0198ffd1 SK |
237 | /* |
238 | * We need to ensure that only one cpu can work on dequeueing of | |
239 | * the reorder queue the time. Calculating in which percpu reorder | |
240 | * queue the next object will arrive takes some time. A spinlock | |
241 | * would be highly contended. Also it is not clear in which order | |
242 | * the objects arrive to the reorder queues. So a cpu could wait to | |
243 | * get the lock just to notice that there is nothing to do at the | |
244 | * moment. Therefore we use a trylock and let the holder of the lock | |
245 | * care for all the objects enqueued during the holdtime of the lock. | |
246 | */ | |
16295bec | 247 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 248 | return; |
16295bec SK |
249 | |
250 | while (1) { | |
251 | padata = padata_get_next(pd); | |
252 | ||
0198ffd1 SK |
253 | /* |
254 | * All reorder queues are empty, or the next object that needs | |
255 | * serialization is parallel processed by another cpu and is | |
256 | * still on it's way to the cpu's reorder queue, nothing to | |
257 | * do for now. | |
258 | */ | |
16295bec SK |
259 | if (!padata || PTR_ERR(padata) == -EINPROGRESS) |
260 | break; | |
261 | ||
0198ffd1 SK |
262 | /* |
263 | * This cpu has to do the parallel processing of the next | |
264 | * object. It's waiting in the cpu's parallelization queue, | |
265 | * so exit imediately. | |
266 | */ | |
16295bec | 267 | if (PTR_ERR(padata) == -ENODATA) { |
d46a5ac7 | 268 | del_timer(&pd->timer); |
16295bec | 269 | spin_unlock_bh(&pd->lock); |
d46a5ac7 | 270 | return; |
16295bec SK |
271 | } |
272 | ||
e15bacbe | 273 | squeue = per_cpu_ptr(pd->squeue, padata->cb_cpu); |
16295bec | 274 | |
e15bacbe DK |
275 | spin_lock(&squeue->serial.lock); |
276 | list_add_tail(&padata->list, &squeue->serial.list); | |
277 | spin_unlock(&squeue->serial.lock); | |
16295bec | 278 | |
e15bacbe | 279 | queue_work_on(padata->cb_cpu, pinst->wq, &squeue->work); |
16295bec SK |
280 | } |
281 | ||
282 | spin_unlock_bh(&pd->lock); | |
283 | ||
0198ffd1 SK |
284 | /* |
285 | * The next object that needs serialization might have arrived to | |
286 | * the reorder queues in the meantime, we will be called again | |
287 | * from the timer function if noone else cares for it. | |
288 | */ | |
d46a5ac7 SK |
289 | if (atomic_read(&pd->reorder_objects) |
290 | && !(pinst->flags & PADATA_RESET)) | |
291 | mod_timer(&pd->timer, jiffies + HZ); | |
292 | else | |
293 | del_timer(&pd->timer); | |
16295bec | 294 | |
16295bec SK |
295 | return; |
296 | } | |
297 | ||
d46a5ac7 SK |
298 | static void padata_reorder_timer(unsigned long arg) |
299 | { | |
300 | struct parallel_data *pd = (struct parallel_data *)arg; | |
301 | ||
302 | padata_reorder(pd); | |
303 | } | |
304 | ||
e15bacbe | 305 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 306 | { |
e15bacbe | 307 | struct padata_serial_queue *squeue; |
16295bec SK |
308 | struct parallel_data *pd; |
309 | LIST_HEAD(local_list); | |
310 | ||
311 | local_bh_disable(); | |
e15bacbe DK |
312 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
313 | pd = squeue->pd; | |
16295bec | 314 | |
e15bacbe DK |
315 | spin_lock(&squeue->serial.lock); |
316 | list_replace_init(&squeue->serial.list, &local_list); | |
317 | spin_unlock(&squeue->serial.lock); | |
16295bec SK |
318 | |
319 | while (!list_empty(&local_list)) { | |
320 | struct padata_priv *padata; | |
321 | ||
322 | padata = list_entry(local_list.next, | |
323 | struct padata_priv, list); | |
324 | ||
325 | list_del_init(&padata->list); | |
326 | ||
327 | padata->serial(padata); | |
328 | atomic_dec(&pd->refcnt); | |
329 | } | |
330 | local_bh_enable(); | |
331 | } | |
332 | ||
0198ffd1 | 333 | /** |
16295bec SK |
334 | * padata_do_serial - padata serialization function |
335 | * | |
336 | * @padata: object to be serialized. | |
337 | * | |
338 | * padata_do_serial must be called for every parallelized object. | |
339 | * The serialization callback function will run with BHs off. | |
340 | */ | |
341 | void padata_do_serial(struct padata_priv *padata) | |
342 | { | |
343 | int cpu; | |
e15bacbe | 344 | struct padata_parallel_queue *pqueue; |
16295bec SK |
345 | struct parallel_data *pd; |
346 | ||
347 | pd = padata->pd; | |
348 | ||
349 | cpu = get_cpu(); | |
e15bacbe | 350 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec | 351 | |
e15bacbe | 352 | spin_lock(&pqueue->reorder.lock); |
16295bec | 353 | atomic_inc(&pd->reorder_objects); |
e15bacbe DK |
354 | list_add_tail(&padata->list, &pqueue->reorder.list); |
355 | spin_unlock(&pqueue->reorder.lock); | |
16295bec SK |
356 | |
357 | put_cpu(); | |
358 | ||
359 | padata_reorder(pd); | |
360 | } | |
361 | EXPORT_SYMBOL(padata_do_serial); | |
362 | ||
e15bacbe DK |
363 | static int padata_setup_cpumasks(struct parallel_data *pd, |
364 | const struct cpumask *pcpumask, | |
365 | const struct cpumask *cbcpumask) | |
16295bec | 366 | { |
e15bacbe DK |
367 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
368 | return -ENOMEM; | |
16295bec | 369 | |
e15bacbe DK |
370 | cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_active_mask); |
371 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) { | |
372 | free_cpumask_var(pd->cpumask.cbcpu); | |
373 | return -ENOMEM; | |
374 | } | |
16295bec | 375 | |
e15bacbe DK |
376 | cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_active_mask); |
377 | return 0; | |
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; | |
16295bec | 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 | } | |
7b389b2c | 399 | |
e15bacbe DK |
400 | /* Initialize all percpu queues used by parallel workers */ |
401 | static void padata_init_pqueues(struct parallel_data *pd) | |
402 | { | |
403 | int cpu_index, num_cpus, cpu; | |
404 | struct padata_parallel_queue *pqueue; | |
16295bec | 405 | |
e15bacbe DK |
406 | cpu_index = 0; |
407 | for_each_cpu(cpu, pd->cpumask.pcpu) { | |
408 | pqueue = per_cpu_ptr(pd->pqueue, cpu); | |
409 | pqueue->pd = pd; | |
410 | pqueue->cpu_index = cpu_index; | |
fad3a906 | 411 | cpu_index++; |
e15bacbe DK |
412 | |
413 | __padata_list_init(&pqueue->reorder); | |
414 | __padata_list_init(&pqueue->parallel); | |
415 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
416 | atomic_set(&pqueue->num_obj, 0); | |
417 | } | |
16295bec | 418 | |
e15bacbe | 419 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
b89661df | 420 | pd->max_seq_nr = num_cpus ? (MAX_SEQ_NR / num_cpus) * num_cpus - 1 : 0; |
e15bacbe | 421 | } |
16295bec | 422 | |
e15bacbe DK |
423 | /* Allocate and initialize the internal cpumask dependend resources. */ |
424 | static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, | |
425 | const struct cpumask *pcpumask, | |
426 | const struct cpumask *cbcpumask) | |
427 | { | |
428 | struct parallel_data *pd; | |
16295bec | 429 | |
e15bacbe DK |
430 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
431 | if (!pd) | |
432 | goto err; | |
16295bec | 433 | |
e15bacbe DK |
434 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
435 | if (!pd->pqueue) | |
436 | goto err_free_pd; | |
437 | ||
438 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
439 | if (!pd->squeue) | |
440 | goto err_free_pqueue; | |
441 | if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0) | |
442 | goto err_free_squeue; | |
16295bec | 443 | |
e15bacbe DK |
444 | padata_init_pqueues(pd); |
445 | padata_init_squeues(pd); | |
d46a5ac7 | 446 | setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd); |
16295bec SK |
447 | atomic_set(&pd->seq_nr, -1); |
448 | atomic_set(&pd->reorder_objects, 0); | |
449 | atomic_set(&pd->refcnt, 0); | |
450 | pd->pinst = pinst; | |
451 | spin_lock_init(&pd->lock); | |
452 | ||
453 | return pd; | |
454 | ||
e15bacbe DK |
455 | err_free_squeue: |
456 | free_percpu(pd->squeue); | |
457 | err_free_pqueue: | |
458 | free_percpu(pd->pqueue); | |
16295bec SK |
459 | err_free_pd: |
460 | kfree(pd); | |
461 | err: | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | static void padata_free_pd(struct parallel_data *pd) | |
466 | { | |
e15bacbe DK |
467 | free_cpumask_var(pd->cpumask.pcpu); |
468 | free_cpumask_var(pd->cpumask.cbcpu); | |
469 | free_percpu(pd->pqueue); | |
470 | free_percpu(pd->squeue); | |
16295bec SK |
471 | kfree(pd); |
472 | } | |
473 | ||
0198ffd1 | 474 | /* Flush all objects out of the padata queues. */ |
2b73b07a SK |
475 | static void padata_flush_queues(struct parallel_data *pd) |
476 | { | |
477 | int cpu; | |
e15bacbe DK |
478 | struct padata_parallel_queue *pqueue; |
479 | struct padata_serial_queue *squeue; | |
2b73b07a | 480 | |
e15bacbe DK |
481 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
482 | pqueue = per_cpu_ptr(pd->pqueue, cpu); | |
483 | flush_work(&pqueue->work); | |
2b73b07a SK |
484 | } |
485 | ||
486 | del_timer_sync(&pd->timer); | |
487 | ||
488 | if (atomic_read(&pd->reorder_objects)) | |
489 | padata_reorder(pd); | |
490 | ||
e15bacbe DK |
491 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
492 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
493 | flush_work(&squeue->work); | |
2b73b07a SK |
494 | } |
495 | ||
496 | BUG_ON(atomic_read(&pd->refcnt) != 0); | |
497 | } | |
498 | ||
4c879170 SK |
499 | static void __padata_start(struct padata_instance *pinst) |
500 | { | |
501 | pinst->flags |= PADATA_INIT; | |
502 | } | |
503 | ||
ee836555 SK |
504 | static void __padata_stop(struct padata_instance *pinst) |
505 | { | |
506 | if (!(pinst->flags & PADATA_INIT)) | |
507 | return; | |
508 | ||
509 | pinst->flags &= ~PADATA_INIT; | |
510 | ||
511 | synchronize_rcu(); | |
512 | ||
513 | get_online_cpus(); | |
514 | padata_flush_queues(pinst->pd); | |
515 | put_online_cpus(); | |
516 | } | |
517 | ||
0198ffd1 | 518 | /* Replace the internal control stucture with a new one. */ |
16295bec SK |
519 | static void padata_replace(struct padata_instance *pinst, |
520 | struct parallel_data *pd_new) | |
521 | { | |
522 | struct parallel_data *pd_old = pinst->pd; | |
e15bacbe | 523 | int notification_mask = 0; |
16295bec SK |
524 | |
525 | pinst->flags |= PADATA_RESET; | |
526 | ||
527 | rcu_assign_pointer(pinst->pd, pd_new); | |
528 | ||
529 | synchronize_rcu(); | |
530 | ||
e15bacbe DK |
531 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) |
532 | notification_mask |= PADATA_CPU_PARALLEL; | |
533 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) | |
534 | notification_mask |= PADATA_CPU_SERIAL; | |
535 | ||
b89661df | 536 | padata_flush_queues(pd_old); |
e15bacbe | 537 | padata_free_pd(pd_old); |
b89661df | 538 | |
e15bacbe DK |
539 | if (notification_mask) |
540 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
541 | notification_mask, pinst); | |
16295bec SK |
542 | |
543 | pinst->flags &= ~PADATA_RESET; | |
544 | } | |
545 | ||
e15bacbe DK |
546 | /** |
547 | * padata_register_cpumask_notifier - Registers a notifier that will be called | |
548 | * if either pcpu or cbcpu or both cpumasks change. | |
549 | * | |
550 | * @pinst: A poineter to padata instance | |
551 | * @nblock: A pointer to notifier block. | |
552 | */ | |
553 | int padata_register_cpumask_notifier(struct padata_instance *pinst, | |
554 | struct notifier_block *nblock) | |
555 | { | |
556 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, | |
557 | nblock); | |
558 | } | |
559 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
560 | ||
561 | /** | |
562 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
563 | * registered earlier using padata_register_cpumask_notifier | |
564 | * | |
565 | * @pinst: A pointer to data instance. | |
566 | * @nlock: A pointer to notifier block. | |
567 | */ | |
568 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
569 | struct notifier_block *nblock) | |
570 | { | |
571 | return blocking_notifier_chain_unregister( | |
572 | &pinst->cpumask_change_notifier, | |
573 | nblock); | |
574 | } | |
575 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
576 | ||
577 | ||
33e54450 SK |
578 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
579 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
580 | const struct cpumask *cpumask) | |
581 | { | |
582 | if (!cpumask_intersects(cpumask, cpu_active_mask)) { | |
583 | pinst->flags |= PADATA_INVALID; | |
584 | return false; | |
585 | } | |
586 | ||
587 | pinst->flags &= ~PADATA_INVALID; | |
588 | return true; | |
589 | } | |
590 | ||
0198ffd1 | 591 | /** |
e15bacbe DK |
592 | * padata_get_cpumask: Fetch serial or parallel cpumask from the |
593 | * given padata instance and copy it to @out_mask | |
594 | * | |
595 | * @pinst: A pointer to padata instance | |
596 | * @cpumask_type: Specifies which cpumask will be copied. | |
597 | * Possible values are PADATA_CPU_SERIAL *or* PADATA_CPU_PARALLEL | |
598 | * corresponding to serial and parallel cpumask respectively. | |
599 | * @out_mask: A pointer to cpumask structure where selected | |
600 | * cpumask will be copied. | |
601 | */ | |
602 | int padata_get_cpumask(struct padata_instance *pinst, | |
603 | int cpumask_type, struct cpumask *out_mask) | |
604 | { | |
605 | struct parallel_data *pd; | |
606 | int ret = 0; | |
607 | ||
608 | rcu_read_lock_bh(); | |
609 | pd = rcu_dereference(pinst->pd); | |
610 | switch (cpumask_type) { | |
611 | case PADATA_CPU_SERIAL: | |
612 | cpumask_copy(out_mask, pd->cpumask.cbcpu); | |
613 | break; | |
614 | case PADATA_CPU_PARALLEL: | |
615 | cpumask_copy(out_mask, pd->cpumask.pcpu); | |
616 | break; | |
617 | default: | |
618 | ret = -EINVAL; | |
619 | } | |
620 | ||
621 | rcu_read_unlock_bh(); | |
622 | return ret; | |
623 | } | |
624 | EXPORT_SYMBOL(padata_get_cpumask); | |
625 | ||
626 | /** | |
627 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
628 | * equivalent to @cpumask. | |
16295bec SK |
629 | * |
630 | * @pinst: padata instance | |
e15bacbe DK |
631 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
632 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
633 | * @cpumask: the cpumask to use |
634 | */ | |
e15bacbe DK |
635 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
636 | cpumask_var_t cpumask) | |
637 | { | |
638 | struct cpumask *serial_mask, *parallel_mask; | |
639 | ||
640 | switch (cpumask_type) { | |
641 | case PADATA_CPU_PARALLEL: | |
642 | serial_mask = pinst->cpumask.cbcpu; | |
643 | parallel_mask = cpumask; | |
644 | break; | |
645 | case PADATA_CPU_SERIAL: | |
646 | parallel_mask = pinst->cpumask.pcpu; | |
647 | serial_mask = cpumask; | |
648 | break; | |
649 | default: | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
653 | return __padata_set_cpumasks(pinst, parallel_mask, serial_mask); | |
654 | } | |
655 | EXPORT_SYMBOL(padata_set_cpumask); | |
656 | ||
657 | /** | |
658 | * __padata_set_cpumasks - Set both parallel and serial cpumasks. The first | |
659 | * one is used by parallel workers and the second one | |
660 | * by the wokers doing serialization. | |
661 | * | |
662 | * @pinst: padata instance | |
663 | * @pcpumask: the cpumask to use for parallel workers | |
664 | * @cbcpumask: the cpumsak to use for serial workers | |
665 | */ | |
666 | int __padata_set_cpumasks(struct padata_instance *pinst, | |
667 | cpumask_var_t pcpumask, cpumask_var_t cbcpumask) | |
16295bec | 668 | { |
33e54450 | 669 | int valid; |
16295bec | 670 | int err = 0; |
33e54450 | 671 | struct parallel_data *pd = NULL; |
16295bec | 672 | |
16295bec | 673 | mutex_lock(&pinst->lock); |
b89661df | 674 | get_online_cpus(); |
16295bec | 675 | |
e15bacbe DK |
676 | valid = padata_validate_cpumask(pinst, pcpumask); |
677 | if (!valid) { | |
678 | __padata_stop(pinst); | |
679 | goto out_replace; | |
680 | } | |
681 | ||
682 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
b89661df | 683 | if (!valid) |
33e54450 | 684 | __padata_stop(pinst); |
6751fb3c | 685 | |
b89661df | 686 | out_replace: |
e15bacbe | 687 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
16295bec SK |
688 | if (!pd) { |
689 | err = -ENOMEM; | |
690 | goto out; | |
691 | } | |
692 | ||
e15bacbe DK |
693 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
694 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
695 | |
696 | padata_replace(pinst, pd); | |
697 | ||
33e54450 SK |
698 | if (valid) |
699 | __padata_start(pinst); | |
700 | ||
16295bec | 701 | out: |
6751fb3c | 702 | put_online_cpus(); |
16295bec SK |
703 | mutex_unlock(&pinst->lock); |
704 | ||
705 | return err; | |
e15bacbe | 706 | |
16295bec | 707 | } |
e15bacbe | 708 | EXPORT_SYMBOL(__padata_set_cpumasks); |
16295bec SK |
709 | |
710 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) | |
711 | { | |
712 | struct parallel_data *pd; | |
713 | ||
714 | if (cpumask_test_cpu(cpu, cpu_active_mask)) { | |
e15bacbe DK |
715 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
716 | pinst->cpumask.cbcpu); | |
16295bec SK |
717 | if (!pd) |
718 | return -ENOMEM; | |
719 | ||
720 | padata_replace(pinst, pd); | |
33e54450 | 721 | |
e15bacbe DK |
722 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
723 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 724 | __padata_start(pinst); |
16295bec SK |
725 | } |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
e15bacbe DK |
730 | /** |
731 | * padata_add_cpu - add a cpu to one or both(parallel and serial) | |
732 | * padata cpumasks. | |
16295bec SK |
733 | * |
734 | * @pinst: padata instance | |
735 | * @cpu: cpu to add | |
e15bacbe DK |
736 | * @mask: bitmask of flags specifying to which cpumask @cpu shuld be added. |
737 | * The @mask may be any combination of the following flags: | |
738 | * PADATA_CPU_SERIAL - serial cpumask | |
739 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 740 | */ |
e15bacbe DK |
741 | |
742 | int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask) | |
16295bec SK |
743 | { |
744 | int err; | |
745 | ||
e15bacbe DK |
746 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
747 | return -EINVAL; | |
748 | ||
16295bec SK |
749 | mutex_lock(&pinst->lock); |
750 | ||
6751fb3c | 751 | get_online_cpus(); |
e15bacbe DK |
752 | if (mask & PADATA_CPU_SERIAL) |
753 | cpumask_set_cpu(cpu, pinst->cpumask.cbcpu); | |
754 | if (mask & PADATA_CPU_PARALLEL) | |
755 | cpumask_set_cpu(cpu, pinst->cpumask.pcpu); | |
756 | ||
16295bec | 757 | err = __padata_add_cpu(pinst, cpu); |
6751fb3c | 758 | put_online_cpus(); |
16295bec SK |
759 | |
760 | mutex_unlock(&pinst->lock); | |
761 | ||
762 | return err; | |
763 | } | |
764 | EXPORT_SYMBOL(padata_add_cpu); | |
765 | ||
766 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) | |
767 | { | |
33e54450 | 768 | struct parallel_data *pd = NULL; |
16295bec SK |
769 | |
770 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { | |
33e54450 | 771 | |
e15bacbe | 772 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 773 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 774 | __padata_stop(pinst); |
33e54450 | 775 | |
e15bacbe DK |
776 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
777 | pinst->cpumask.cbcpu); | |
16295bec SK |
778 | if (!pd) |
779 | return -ENOMEM; | |
780 | ||
781 | padata_replace(pinst, pd); | |
782 | } | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
e15bacbe DK |
787 | /** |
788 | * padata_remove_cpu - remove a cpu from the one or both(serial and paralell) | |
789 | * padata cpumasks. | |
16295bec SK |
790 | * |
791 | * @pinst: padata instance | |
792 | * @cpu: cpu to remove | |
e15bacbe DK |
793 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
794 | * The @mask may be any combination of the following flags: | |
795 | * PADATA_CPU_SERIAL - serial cpumask | |
796 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 797 | */ |
e15bacbe | 798 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
799 | { |
800 | int err; | |
801 | ||
e15bacbe DK |
802 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
803 | return -EINVAL; | |
804 | ||
16295bec SK |
805 | mutex_lock(&pinst->lock); |
806 | ||
6751fb3c | 807 | get_online_cpus(); |
e15bacbe DK |
808 | if (mask & PADATA_CPU_SERIAL) |
809 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
810 | if (mask & PADATA_CPU_PARALLEL) | |
811 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
812 | ||
16295bec | 813 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 814 | put_online_cpus(); |
16295bec SK |
815 | |
816 | mutex_unlock(&pinst->lock); | |
817 | ||
818 | return err; | |
819 | } | |
820 | EXPORT_SYMBOL(padata_remove_cpu); | |
821 | ||
0198ffd1 | 822 | /** |
16295bec SK |
823 | * padata_start - start the parallel processing |
824 | * | |
825 | * @pinst: padata instance to start | |
826 | */ | |
4c879170 | 827 | int padata_start(struct padata_instance *pinst) |
16295bec | 828 | { |
4c879170 SK |
829 | int err = 0; |
830 | ||
16295bec | 831 | mutex_lock(&pinst->lock); |
4c879170 SK |
832 | |
833 | if (pinst->flags & PADATA_INVALID) | |
834 | err =-EINVAL; | |
835 | ||
836 | __padata_start(pinst); | |
837 | ||
16295bec | 838 | mutex_unlock(&pinst->lock); |
4c879170 SK |
839 | |
840 | return err; | |
16295bec SK |
841 | } |
842 | EXPORT_SYMBOL(padata_start); | |
843 | ||
0198ffd1 | 844 | /** |
16295bec SK |
845 | * padata_stop - stop the parallel processing |
846 | * | |
847 | * @pinst: padata instance to stop | |
848 | */ | |
849 | void padata_stop(struct padata_instance *pinst) | |
850 | { | |
16295bec | 851 | mutex_lock(&pinst->lock); |
ee836555 | 852 | __padata_stop(pinst); |
16295bec SK |
853 | mutex_unlock(&pinst->lock); |
854 | } | |
855 | EXPORT_SYMBOL(padata_stop); | |
856 | ||
e2cb2f1c | 857 | #ifdef CONFIG_HOTPLUG_CPU |
e15bacbe DK |
858 | |
859 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) | |
860 | { | |
861 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
862 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
863 | } | |
864 | ||
865 | ||
975d2603 HK |
866 | static int padata_cpu_callback(struct notifier_block *nfb, |
867 | unsigned long action, void *hcpu) | |
16295bec SK |
868 | { |
869 | int err; | |
870 | struct padata_instance *pinst; | |
871 | int cpu = (unsigned long)hcpu; | |
872 | ||
873 | pinst = container_of(nfb, struct padata_instance, cpu_notifier); | |
874 | ||
875 | switch (action) { | |
876 | case CPU_ONLINE: | |
877 | case CPU_ONLINE_FROZEN: | |
e15bacbe | 878 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
879 | break; |
880 | mutex_lock(&pinst->lock); | |
881 | err = __padata_add_cpu(pinst, cpu); | |
882 | mutex_unlock(&pinst->lock); | |
883 | if (err) | |
884 | return NOTIFY_BAD; | |
885 | break; | |
886 | ||
887 | case CPU_DOWN_PREPARE: | |
888 | case CPU_DOWN_PREPARE_FROZEN: | |
e15bacbe | 889 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
890 | break; |
891 | mutex_lock(&pinst->lock); | |
892 | err = __padata_remove_cpu(pinst, cpu); | |
893 | mutex_unlock(&pinst->lock); | |
894 | if (err) | |
895 | return NOTIFY_BAD; | |
896 | break; | |
897 | ||
898 | case CPU_UP_CANCELED: | |
899 | case CPU_UP_CANCELED_FROZEN: | |
e15bacbe | 900 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
901 | break; |
902 | mutex_lock(&pinst->lock); | |
903 | __padata_remove_cpu(pinst, cpu); | |
904 | mutex_unlock(&pinst->lock); | |
905 | ||
906 | case CPU_DOWN_FAILED: | |
907 | case CPU_DOWN_FAILED_FROZEN: | |
e15bacbe | 908 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
909 | break; |
910 | mutex_lock(&pinst->lock); | |
911 | __padata_add_cpu(pinst, cpu); | |
912 | mutex_unlock(&pinst->lock); | |
913 | } | |
914 | ||
915 | return NOTIFY_OK; | |
916 | } | |
e2cb2f1c | 917 | #endif |
16295bec | 918 | |
5e017dc3 DK |
919 | static void __padata_free(struct padata_instance *pinst) |
920 | { | |
921 | #ifdef CONFIG_HOTPLUG_CPU | |
922 | unregister_hotcpu_notifier(&pinst->cpu_notifier); | |
923 | #endif | |
924 | ||
925 | padata_stop(pinst); | |
926 | padata_free_pd(pinst->pd); | |
927 | free_cpumask_var(pinst->cpumask.pcpu); | |
928 | free_cpumask_var(pinst->cpumask.cbcpu); | |
929 | kfree(pinst); | |
930 | } | |
931 | ||
932 | #define kobj2pinst(_kobj) \ | |
933 | container_of(_kobj, struct padata_instance, kobj) | |
934 | #define attr2pentry(_attr) \ | |
935 | container_of(_attr, struct padata_sysfs_entry, attr) | |
936 | ||
937 | static void padata_sysfs_release(struct kobject *kobj) | |
938 | { | |
939 | struct padata_instance *pinst = kobj2pinst(kobj); | |
940 | __padata_free(pinst); | |
941 | } | |
942 | ||
943 | struct padata_sysfs_entry { | |
944 | struct attribute attr; | |
945 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
946 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
947 | const char *, size_t); | |
948 | }; | |
949 | ||
950 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
951 | struct attribute *attr, char *buf) | |
952 | { | |
953 | struct cpumask *cpumask; | |
954 | ssize_t len; | |
955 | ||
956 | mutex_lock(&pinst->lock); | |
957 | if (!strcmp(attr->name, "serial_cpumask")) | |
958 | cpumask = pinst->cpumask.cbcpu; | |
959 | else | |
960 | cpumask = pinst->cpumask.pcpu; | |
961 | ||
962 | len = bitmap_scnprintf(buf, PAGE_SIZE, cpumask_bits(cpumask), | |
963 | nr_cpu_ids); | |
964 | if (PAGE_SIZE - len < 2) | |
965 | len = -EINVAL; | |
966 | else | |
967 | len += sprintf(buf + len, "\n"); | |
968 | ||
969 | mutex_unlock(&pinst->lock); | |
970 | return len; | |
971 | } | |
972 | ||
973 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
974 | struct attribute *attr, | |
975 | const char *buf, size_t count) | |
976 | { | |
977 | cpumask_var_t new_cpumask; | |
978 | ssize_t ret; | |
979 | int mask_type; | |
980 | ||
981 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
982 | return -ENOMEM; | |
983 | ||
984 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
985 | nr_cpumask_bits); | |
986 | if (ret < 0) | |
987 | goto out; | |
988 | ||
989 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
990 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
991 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
992 | if (!ret) | |
993 | ret = count; | |
994 | ||
995 | out: | |
996 | free_cpumask_var(new_cpumask); | |
997 | return ret; | |
998 | } | |
999 | ||
1000 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
1001 | static struct padata_sysfs_entry _name##_attr = \ | |
1002 | __ATTR(_name, 0644, _show_name, _store_name) | |
1003 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
1004 | static struct padata_sysfs_entry _name##_attr = \ | |
1005 | __ATTR(_name, 0400, _show_name, NULL) | |
1006 | ||
1007 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
1008 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
1009 | ||
1010 | /* | |
1011 | * Padata sysfs provides the following objects: | |
1012 | * serial_cpumask [RW] - cpumask for serial workers | |
1013 | * parallel_cpumask [RW] - cpumask for parallel workers | |
1014 | */ | |
1015 | static struct attribute *padata_default_attrs[] = { | |
1016 | &serial_cpumask_attr.attr, | |
1017 | ¶llel_cpumask_attr.attr, | |
1018 | NULL, | |
1019 | }; | |
1020 | ||
1021 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
1022 | struct attribute *attr, char *buf) | |
1023 | { | |
1024 | struct padata_instance *pinst; | |
1025 | struct padata_sysfs_entry *pentry; | |
1026 | ssize_t ret = -EIO; | |
1027 | ||
1028 | pinst = kobj2pinst(kobj); | |
1029 | pentry = attr2pentry(attr); | |
1030 | if (pentry->show) | |
1031 | ret = pentry->show(pinst, attr, buf); | |
1032 | ||
1033 | return ret; | |
1034 | } | |
1035 | ||
1036 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
1037 | const char *buf, size_t count) | |
1038 | { | |
1039 | struct padata_instance *pinst; | |
1040 | struct padata_sysfs_entry *pentry; | |
1041 | ssize_t ret = -EIO; | |
1042 | ||
1043 | pinst = kobj2pinst(kobj); | |
1044 | pentry = attr2pentry(attr); | |
1045 | if (pentry->show) | |
1046 | ret = pentry->store(pinst, attr, buf, count); | |
1047 | ||
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | static const struct sysfs_ops padata_sysfs_ops = { | |
1052 | .show = padata_sysfs_show, | |
1053 | .store = padata_sysfs_store, | |
1054 | }; | |
1055 | ||
1056 | static struct kobj_type padata_attr_type = { | |
1057 | .sysfs_ops = &padata_sysfs_ops, | |
1058 | .default_attrs = padata_default_attrs, | |
1059 | .release = padata_sysfs_release, | |
1060 | }; | |
1061 | ||
0198ffd1 | 1062 | /** |
e15bacbe DK |
1063 | * padata_alloc - Allocate and initialize padata instance. |
1064 | * Use default cpumask(cpu_possible_mask) | |
1065 | * for serial and parallel workes. | |
1066 | * | |
1067 | * @wq: workqueue to use for the allocated padata instance | |
1068 | */ | |
1069 | struct padata_instance *padata_alloc(struct workqueue_struct *wq) | |
1070 | { | |
1071 | return __padata_alloc(wq, cpu_possible_mask, cpu_possible_mask); | |
1072 | } | |
1073 | EXPORT_SYMBOL(padata_alloc); | |
1074 | ||
1075 | /** | |
1076 | * __padata_alloc - allocate and initialize a padata instance | |
1077 | * and specify cpumasks for serial and parallel workers. | |
16295bec | 1078 | * |
16295bec | 1079 | * @wq: workqueue to use for the allocated padata instance |
e15bacbe DK |
1080 | * @pcpumask: cpumask that will be used for padata parallelization |
1081 | * @cbcpumask: cpumask that will be used for padata serialization | |
16295bec | 1082 | */ |
e15bacbe DK |
1083 | struct padata_instance *__padata_alloc(struct workqueue_struct *wq, |
1084 | const struct cpumask *pcpumask, | |
1085 | const struct cpumask *cbcpumask) | |
16295bec | 1086 | { |
16295bec | 1087 | struct padata_instance *pinst; |
33e54450 | 1088 | struct parallel_data *pd = NULL; |
16295bec SK |
1089 | |
1090 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
1091 | if (!pinst) | |
1092 | goto err; | |
1093 | ||
6751fb3c | 1094 | get_online_cpus(); |
e15bacbe DK |
1095 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) |
1096 | goto err_free_inst; | |
1097 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { | |
1098 | free_cpumask_var(pinst->cpumask.pcpu); | |
16295bec | 1099 | goto err_free_inst; |
33e54450 | 1100 | } |
e15bacbe DK |
1101 | if (!padata_validate_cpumask(pinst, pcpumask) || |
1102 | !padata_validate_cpumask(pinst, cbcpumask)) | |
1103 | goto err_free_masks; | |
1104 | ||
1105 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); | |
1106 | if (!pd) | |
1107 | goto err_free_masks; | |
74781387 | 1108 | |
16295bec SK |
1109 | rcu_assign_pointer(pinst->pd, pd); |
1110 | ||
1111 | pinst->wq = wq; | |
1112 | ||
e15bacbe DK |
1113 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
1114 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
1115 | |
1116 | pinst->flags = 0; | |
1117 | ||
e2cb2f1c | 1118 | #ifdef CONFIG_HOTPLUG_CPU |
16295bec SK |
1119 | pinst->cpu_notifier.notifier_call = padata_cpu_callback; |
1120 | pinst->cpu_notifier.priority = 0; | |
e2cb2f1c SK |
1121 | register_hotcpu_notifier(&pinst->cpu_notifier); |
1122 | #endif | |
16295bec | 1123 | |
6751fb3c SK |
1124 | put_online_cpus(); |
1125 | ||
e15bacbe | 1126 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 1127 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1128 | mutex_init(&pinst->lock); |
1129 | ||
1130 | return pinst; | |
1131 | ||
e15bacbe DK |
1132 | err_free_masks: |
1133 | free_cpumask_var(pinst->cpumask.pcpu); | |
1134 | free_cpumask_var(pinst->cpumask.cbcpu); | |
16295bec SK |
1135 | err_free_inst: |
1136 | kfree(pinst); | |
6751fb3c | 1137 | put_online_cpus(); |
16295bec SK |
1138 | err: |
1139 | return NULL; | |
1140 | } | |
e15bacbe | 1141 | EXPORT_SYMBOL(__padata_alloc); |
16295bec | 1142 | |
0198ffd1 | 1143 | /** |
16295bec SK |
1144 | * padata_free - free a padata instance |
1145 | * | |
0198ffd1 | 1146 | * @padata_inst: padata instance to free |
16295bec SK |
1147 | */ |
1148 | void padata_free(struct padata_instance *pinst) | |
1149 | { | |
5e017dc3 | 1150 | kobject_put(&pinst->kobj); |
16295bec SK |
1151 | } |
1152 | EXPORT_SYMBOL(padata_free); |