Commit | Line | Data |
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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 DK |
419 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
420 | pd->max_seq_nr = (MAX_SEQ_NR / num_cpus) * num_cpus - 1; | |
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(); | |
e15bacbe DK |
530 | if (!pd_old) |
531 | goto out; | |
16295bec | 532 | |
e15bacbe DK |
533 | padata_flush_queues(pd_old); |
534 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) | |
535 | notification_mask |= PADATA_CPU_PARALLEL; | |
536 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) | |
537 | notification_mask |= PADATA_CPU_SERIAL; | |
538 | ||
539 | padata_free_pd(pd_old); | |
540 | if (notification_mask) | |
541 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
542 | notification_mask, pinst); | |
16295bec | 543 | |
e15bacbe | 544 | out: |
16295bec SK |
545 | pinst->flags &= ~PADATA_RESET; |
546 | } | |
547 | ||
e15bacbe DK |
548 | /** |
549 | * padata_register_cpumask_notifier - Registers a notifier that will be called | |
550 | * if either pcpu or cbcpu or both cpumasks change. | |
551 | * | |
552 | * @pinst: A poineter to padata instance | |
553 | * @nblock: A pointer to notifier block. | |
554 | */ | |
555 | int padata_register_cpumask_notifier(struct padata_instance *pinst, | |
556 | struct notifier_block *nblock) | |
557 | { | |
558 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, | |
559 | nblock); | |
560 | } | |
561 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
562 | ||
563 | /** | |
564 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
565 | * registered earlier using padata_register_cpumask_notifier | |
566 | * | |
567 | * @pinst: A pointer to data instance. | |
568 | * @nlock: A pointer to notifier block. | |
569 | */ | |
570 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
571 | struct notifier_block *nblock) | |
572 | { | |
573 | return blocking_notifier_chain_unregister( | |
574 | &pinst->cpumask_change_notifier, | |
575 | nblock); | |
576 | } | |
577 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
578 | ||
579 | ||
33e54450 SK |
580 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
581 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
582 | const struct cpumask *cpumask) | |
583 | { | |
584 | if (!cpumask_intersects(cpumask, cpu_active_mask)) { | |
585 | pinst->flags |= PADATA_INVALID; | |
586 | return false; | |
587 | } | |
588 | ||
589 | pinst->flags &= ~PADATA_INVALID; | |
590 | return true; | |
591 | } | |
592 | ||
0198ffd1 | 593 | /** |
e15bacbe DK |
594 | * padata_get_cpumask: Fetch serial or parallel cpumask from the |
595 | * given padata instance and copy it to @out_mask | |
596 | * | |
597 | * @pinst: A pointer to padata instance | |
598 | * @cpumask_type: Specifies which cpumask will be copied. | |
599 | * Possible values are PADATA_CPU_SERIAL *or* PADATA_CPU_PARALLEL | |
600 | * corresponding to serial and parallel cpumask respectively. | |
601 | * @out_mask: A pointer to cpumask structure where selected | |
602 | * cpumask will be copied. | |
603 | */ | |
604 | int padata_get_cpumask(struct padata_instance *pinst, | |
605 | int cpumask_type, struct cpumask *out_mask) | |
606 | { | |
607 | struct parallel_data *pd; | |
608 | int ret = 0; | |
609 | ||
610 | rcu_read_lock_bh(); | |
611 | pd = rcu_dereference(pinst->pd); | |
612 | switch (cpumask_type) { | |
613 | case PADATA_CPU_SERIAL: | |
614 | cpumask_copy(out_mask, pd->cpumask.cbcpu); | |
615 | break; | |
616 | case PADATA_CPU_PARALLEL: | |
617 | cpumask_copy(out_mask, pd->cpumask.pcpu); | |
618 | break; | |
619 | default: | |
620 | ret = -EINVAL; | |
621 | } | |
622 | ||
623 | rcu_read_unlock_bh(); | |
624 | return ret; | |
625 | } | |
626 | EXPORT_SYMBOL(padata_get_cpumask); | |
627 | ||
628 | /** | |
629 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
630 | * equivalent to @cpumask. | |
16295bec SK |
631 | * |
632 | * @pinst: padata instance | |
e15bacbe DK |
633 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
634 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
635 | * @cpumask: the cpumask to use |
636 | */ | |
e15bacbe DK |
637 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
638 | cpumask_var_t cpumask) | |
639 | { | |
640 | struct cpumask *serial_mask, *parallel_mask; | |
641 | ||
642 | switch (cpumask_type) { | |
643 | case PADATA_CPU_PARALLEL: | |
644 | serial_mask = pinst->cpumask.cbcpu; | |
645 | parallel_mask = cpumask; | |
646 | break; | |
647 | case PADATA_CPU_SERIAL: | |
648 | parallel_mask = pinst->cpumask.pcpu; | |
649 | serial_mask = cpumask; | |
650 | break; | |
651 | default: | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | return __padata_set_cpumasks(pinst, parallel_mask, serial_mask); | |
656 | } | |
657 | EXPORT_SYMBOL(padata_set_cpumask); | |
658 | ||
659 | /** | |
660 | * __padata_set_cpumasks - Set both parallel and serial cpumasks. The first | |
661 | * one is used by parallel workers and the second one | |
662 | * by the wokers doing serialization. | |
663 | * | |
664 | * @pinst: padata instance | |
665 | * @pcpumask: the cpumask to use for parallel workers | |
666 | * @cbcpumask: the cpumsak to use for serial workers | |
667 | */ | |
668 | int __padata_set_cpumasks(struct padata_instance *pinst, | |
669 | cpumask_var_t pcpumask, cpumask_var_t cbcpumask) | |
16295bec | 670 | { |
33e54450 | 671 | int valid; |
16295bec | 672 | int err = 0; |
33e54450 | 673 | struct parallel_data *pd = NULL; |
16295bec | 674 | |
16295bec SK |
675 | mutex_lock(&pinst->lock); |
676 | ||
e15bacbe DK |
677 | valid = padata_validate_cpumask(pinst, pcpumask); |
678 | if (!valid) { | |
679 | __padata_stop(pinst); | |
680 | goto out_replace; | |
681 | } | |
682 | ||
683 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
33e54450 SK |
684 | if (!valid) { |
685 | __padata_stop(pinst); | |
686 | goto out_replace; | |
687 | } | |
688 | ||
6751fb3c SK |
689 | get_online_cpus(); |
690 | ||
e15bacbe | 691 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
16295bec SK |
692 | if (!pd) { |
693 | err = -ENOMEM; | |
694 | goto out; | |
695 | } | |
696 | ||
33e54450 | 697 | out_replace: |
e15bacbe DK |
698 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
699 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
700 | |
701 | padata_replace(pinst, pd); | |
702 | ||
33e54450 SK |
703 | if (valid) |
704 | __padata_start(pinst); | |
705 | ||
16295bec | 706 | out: |
6751fb3c SK |
707 | put_online_cpus(); |
708 | ||
16295bec SK |
709 | mutex_unlock(&pinst->lock); |
710 | ||
711 | return err; | |
e15bacbe | 712 | |
16295bec | 713 | } |
e15bacbe | 714 | EXPORT_SYMBOL(__padata_set_cpumasks); |
16295bec SK |
715 | |
716 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) | |
717 | { | |
718 | struct parallel_data *pd; | |
719 | ||
720 | if (cpumask_test_cpu(cpu, cpu_active_mask)) { | |
e15bacbe DK |
721 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
722 | pinst->cpumask.cbcpu); | |
16295bec SK |
723 | if (!pd) |
724 | return -ENOMEM; | |
725 | ||
726 | padata_replace(pinst, pd); | |
33e54450 | 727 | |
e15bacbe DK |
728 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
729 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 730 | __padata_start(pinst); |
16295bec SK |
731 | } |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
e15bacbe DK |
736 | /** |
737 | * padata_add_cpu - add a cpu to one or both(parallel and serial) | |
738 | * padata cpumasks. | |
16295bec SK |
739 | * |
740 | * @pinst: padata instance | |
741 | * @cpu: cpu to add | |
e15bacbe DK |
742 | * @mask: bitmask of flags specifying to which cpumask @cpu shuld be added. |
743 | * The @mask may be any combination of the following flags: | |
744 | * PADATA_CPU_SERIAL - serial cpumask | |
745 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 746 | */ |
e15bacbe DK |
747 | |
748 | int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask) | |
16295bec SK |
749 | { |
750 | int err; | |
751 | ||
e15bacbe DK |
752 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
753 | return -EINVAL; | |
754 | ||
16295bec SK |
755 | mutex_lock(&pinst->lock); |
756 | ||
6751fb3c | 757 | get_online_cpus(); |
e15bacbe DK |
758 | if (mask & PADATA_CPU_SERIAL) |
759 | cpumask_set_cpu(cpu, pinst->cpumask.cbcpu); | |
760 | if (mask & PADATA_CPU_PARALLEL) | |
761 | cpumask_set_cpu(cpu, pinst->cpumask.pcpu); | |
762 | ||
16295bec | 763 | err = __padata_add_cpu(pinst, cpu); |
6751fb3c | 764 | put_online_cpus(); |
16295bec SK |
765 | |
766 | mutex_unlock(&pinst->lock); | |
767 | ||
768 | return err; | |
769 | } | |
770 | EXPORT_SYMBOL(padata_add_cpu); | |
771 | ||
772 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) | |
773 | { | |
33e54450 | 774 | struct parallel_data *pd = NULL; |
16295bec SK |
775 | |
776 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { | |
33e54450 | 777 | |
e15bacbe DK |
778 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
779 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) { | |
33e54450 SK |
780 | __padata_stop(pinst); |
781 | padata_replace(pinst, pd); | |
782 | goto out; | |
783 | } | |
784 | ||
e15bacbe DK |
785 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
786 | pinst->cpumask.cbcpu); | |
16295bec SK |
787 | if (!pd) |
788 | return -ENOMEM; | |
789 | ||
790 | padata_replace(pinst, pd); | |
791 | } | |
792 | ||
33e54450 | 793 | out: |
16295bec SK |
794 | return 0; |
795 | } | |
796 | ||
e15bacbe DK |
797 | /** |
798 | * padata_remove_cpu - remove a cpu from the one or both(serial and paralell) | |
799 | * padata cpumasks. | |
16295bec SK |
800 | * |
801 | * @pinst: padata instance | |
802 | * @cpu: cpu to remove | |
e15bacbe DK |
803 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
804 | * The @mask may be any combination of the following flags: | |
805 | * PADATA_CPU_SERIAL - serial cpumask | |
806 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 807 | */ |
e15bacbe | 808 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
809 | { |
810 | int err; | |
811 | ||
e15bacbe DK |
812 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
813 | return -EINVAL; | |
814 | ||
16295bec SK |
815 | mutex_lock(&pinst->lock); |
816 | ||
6751fb3c | 817 | get_online_cpus(); |
e15bacbe DK |
818 | if (mask & PADATA_CPU_SERIAL) |
819 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
820 | if (mask & PADATA_CPU_PARALLEL) | |
821 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
822 | ||
16295bec | 823 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 824 | put_online_cpus(); |
16295bec SK |
825 | |
826 | mutex_unlock(&pinst->lock); | |
827 | ||
828 | return err; | |
829 | } | |
830 | EXPORT_SYMBOL(padata_remove_cpu); | |
831 | ||
0198ffd1 | 832 | /** |
16295bec SK |
833 | * padata_start - start the parallel processing |
834 | * | |
835 | * @pinst: padata instance to start | |
836 | */ | |
4c879170 | 837 | int padata_start(struct padata_instance *pinst) |
16295bec | 838 | { |
4c879170 SK |
839 | int err = 0; |
840 | ||
16295bec | 841 | mutex_lock(&pinst->lock); |
4c879170 SK |
842 | |
843 | if (pinst->flags & PADATA_INVALID) | |
844 | err =-EINVAL; | |
845 | ||
846 | __padata_start(pinst); | |
847 | ||
16295bec | 848 | mutex_unlock(&pinst->lock); |
4c879170 SK |
849 | |
850 | return err; | |
16295bec SK |
851 | } |
852 | EXPORT_SYMBOL(padata_start); | |
853 | ||
0198ffd1 | 854 | /** |
16295bec SK |
855 | * padata_stop - stop the parallel processing |
856 | * | |
857 | * @pinst: padata instance to stop | |
858 | */ | |
859 | void padata_stop(struct padata_instance *pinst) | |
860 | { | |
16295bec | 861 | mutex_lock(&pinst->lock); |
ee836555 | 862 | __padata_stop(pinst); |
16295bec SK |
863 | mutex_unlock(&pinst->lock); |
864 | } | |
865 | EXPORT_SYMBOL(padata_stop); | |
866 | ||
e2cb2f1c | 867 | #ifdef CONFIG_HOTPLUG_CPU |
e15bacbe DK |
868 | |
869 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) | |
870 | { | |
871 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
872 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
873 | } | |
874 | ||
875 | ||
975d2603 HK |
876 | static int padata_cpu_callback(struct notifier_block *nfb, |
877 | unsigned long action, void *hcpu) | |
16295bec SK |
878 | { |
879 | int err; | |
880 | struct padata_instance *pinst; | |
881 | int cpu = (unsigned long)hcpu; | |
882 | ||
883 | pinst = container_of(nfb, struct padata_instance, cpu_notifier); | |
884 | ||
885 | switch (action) { | |
886 | case CPU_ONLINE: | |
887 | case CPU_ONLINE_FROZEN: | |
e15bacbe | 888 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
889 | break; |
890 | mutex_lock(&pinst->lock); | |
891 | err = __padata_add_cpu(pinst, cpu); | |
892 | mutex_unlock(&pinst->lock); | |
893 | if (err) | |
894 | return NOTIFY_BAD; | |
895 | break; | |
896 | ||
897 | case CPU_DOWN_PREPARE: | |
898 | case CPU_DOWN_PREPARE_FROZEN: | |
e15bacbe | 899 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
900 | break; |
901 | mutex_lock(&pinst->lock); | |
902 | err = __padata_remove_cpu(pinst, cpu); | |
903 | mutex_unlock(&pinst->lock); | |
904 | if (err) | |
905 | return NOTIFY_BAD; | |
906 | break; | |
907 | ||
908 | case CPU_UP_CANCELED: | |
909 | case CPU_UP_CANCELED_FROZEN: | |
e15bacbe | 910 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
911 | break; |
912 | mutex_lock(&pinst->lock); | |
913 | __padata_remove_cpu(pinst, cpu); | |
914 | mutex_unlock(&pinst->lock); | |
915 | ||
916 | case CPU_DOWN_FAILED: | |
917 | case CPU_DOWN_FAILED_FROZEN: | |
e15bacbe | 918 | if (!pinst_has_cpu(pinst, cpu)) |
16295bec SK |
919 | break; |
920 | mutex_lock(&pinst->lock); | |
921 | __padata_add_cpu(pinst, cpu); | |
922 | mutex_unlock(&pinst->lock); | |
923 | } | |
924 | ||
925 | return NOTIFY_OK; | |
926 | } | |
e2cb2f1c | 927 | #endif |
16295bec | 928 | |
5e017dc3 DK |
929 | static void __padata_free(struct padata_instance *pinst) |
930 | { | |
931 | #ifdef CONFIG_HOTPLUG_CPU | |
932 | unregister_hotcpu_notifier(&pinst->cpu_notifier); | |
933 | #endif | |
934 | ||
935 | padata_stop(pinst); | |
936 | padata_free_pd(pinst->pd); | |
937 | free_cpumask_var(pinst->cpumask.pcpu); | |
938 | free_cpumask_var(pinst->cpumask.cbcpu); | |
939 | kfree(pinst); | |
940 | } | |
941 | ||
942 | #define kobj2pinst(_kobj) \ | |
943 | container_of(_kobj, struct padata_instance, kobj) | |
944 | #define attr2pentry(_attr) \ | |
945 | container_of(_attr, struct padata_sysfs_entry, attr) | |
946 | ||
947 | static void padata_sysfs_release(struct kobject *kobj) | |
948 | { | |
949 | struct padata_instance *pinst = kobj2pinst(kobj); | |
950 | __padata_free(pinst); | |
951 | } | |
952 | ||
953 | struct padata_sysfs_entry { | |
954 | struct attribute attr; | |
955 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
956 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
957 | const char *, size_t); | |
958 | }; | |
959 | ||
960 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
961 | struct attribute *attr, char *buf) | |
962 | { | |
963 | struct cpumask *cpumask; | |
964 | ssize_t len; | |
965 | ||
966 | mutex_lock(&pinst->lock); | |
967 | if (!strcmp(attr->name, "serial_cpumask")) | |
968 | cpumask = pinst->cpumask.cbcpu; | |
969 | else | |
970 | cpumask = pinst->cpumask.pcpu; | |
971 | ||
972 | len = bitmap_scnprintf(buf, PAGE_SIZE, cpumask_bits(cpumask), | |
973 | nr_cpu_ids); | |
974 | if (PAGE_SIZE - len < 2) | |
975 | len = -EINVAL; | |
976 | else | |
977 | len += sprintf(buf + len, "\n"); | |
978 | ||
979 | mutex_unlock(&pinst->lock); | |
980 | return len; | |
981 | } | |
982 | ||
983 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
984 | struct attribute *attr, | |
985 | const char *buf, size_t count) | |
986 | { | |
987 | cpumask_var_t new_cpumask; | |
988 | ssize_t ret; | |
989 | int mask_type; | |
990 | ||
991 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
992 | return -ENOMEM; | |
993 | ||
994 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
995 | nr_cpumask_bits); | |
996 | if (ret < 0) | |
997 | goto out; | |
998 | ||
999 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
1000 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
1001 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
1002 | if (!ret) | |
1003 | ret = count; | |
1004 | ||
1005 | out: | |
1006 | free_cpumask_var(new_cpumask); | |
1007 | return ret; | |
1008 | } | |
1009 | ||
1010 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
1011 | static struct padata_sysfs_entry _name##_attr = \ | |
1012 | __ATTR(_name, 0644, _show_name, _store_name) | |
1013 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
1014 | static struct padata_sysfs_entry _name##_attr = \ | |
1015 | __ATTR(_name, 0400, _show_name, NULL) | |
1016 | ||
1017 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
1018 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
1019 | ||
1020 | /* | |
1021 | * Padata sysfs provides the following objects: | |
1022 | * serial_cpumask [RW] - cpumask for serial workers | |
1023 | * parallel_cpumask [RW] - cpumask for parallel workers | |
1024 | */ | |
1025 | static struct attribute *padata_default_attrs[] = { | |
1026 | &serial_cpumask_attr.attr, | |
1027 | ¶llel_cpumask_attr.attr, | |
1028 | NULL, | |
1029 | }; | |
1030 | ||
1031 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
1032 | struct attribute *attr, char *buf) | |
1033 | { | |
1034 | struct padata_instance *pinst; | |
1035 | struct padata_sysfs_entry *pentry; | |
1036 | ssize_t ret = -EIO; | |
1037 | ||
1038 | pinst = kobj2pinst(kobj); | |
1039 | pentry = attr2pentry(attr); | |
1040 | if (pentry->show) | |
1041 | ret = pentry->show(pinst, attr, buf); | |
1042 | ||
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
1047 | const char *buf, size_t count) | |
1048 | { | |
1049 | struct padata_instance *pinst; | |
1050 | struct padata_sysfs_entry *pentry; | |
1051 | ssize_t ret = -EIO; | |
1052 | ||
1053 | pinst = kobj2pinst(kobj); | |
1054 | pentry = attr2pentry(attr); | |
1055 | if (pentry->show) | |
1056 | ret = pentry->store(pinst, attr, buf, count); | |
1057 | ||
1058 | return ret; | |
1059 | } | |
1060 | ||
1061 | static const struct sysfs_ops padata_sysfs_ops = { | |
1062 | .show = padata_sysfs_show, | |
1063 | .store = padata_sysfs_store, | |
1064 | }; | |
1065 | ||
1066 | static struct kobj_type padata_attr_type = { | |
1067 | .sysfs_ops = &padata_sysfs_ops, | |
1068 | .default_attrs = padata_default_attrs, | |
1069 | .release = padata_sysfs_release, | |
1070 | }; | |
1071 | ||
0198ffd1 | 1072 | /** |
e15bacbe DK |
1073 | * padata_alloc - Allocate and initialize padata instance. |
1074 | * Use default cpumask(cpu_possible_mask) | |
1075 | * for serial and parallel workes. | |
1076 | * | |
1077 | * @wq: workqueue to use for the allocated padata instance | |
1078 | */ | |
1079 | struct padata_instance *padata_alloc(struct workqueue_struct *wq) | |
1080 | { | |
1081 | return __padata_alloc(wq, cpu_possible_mask, cpu_possible_mask); | |
1082 | } | |
1083 | EXPORT_SYMBOL(padata_alloc); | |
1084 | ||
1085 | /** | |
1086 | * __padata_alloc - allocate and initialize a padata instance | |
1087 | * and specify cpumasks for serial and parallel workers. | |
16295bec | 1088 | * |
16295bec | 1089 | * @wq: workqueue to use for the allocated padata instance |
e15bacbe DK |
1090 | * @pcpumask: cpumask that will be used for padata parallelization |
1091 | * @cbcpumask: cpumask that will be used for padata serialization | |
16295bec | 1092 | */ |
e15bacbe DK |
1093 | struct padata_instance *__padata_alloc(struct workqueue_struct *wq, |
1094 | const struct cpumask *pcpumask, | |
1095 | const struct cpumask *cbcpumask) | |
16295bec | 1096 | { |
16295bec | 1097 | struct padata_instance *pinst; |
33e54450 | 1098 | struct parallel_data *pd = NULL; |
16295bec SK |
1099 | |
1100 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
1101 | if (!pinst) | |
1102 | goto err; | |
1103 | ||
6751fb3c | 1104 | get_online_cpus(); |
e15bacbe DK |
1105 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) |
1106 | goto err_free_inst; | |
1107 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { | |
1108 | free_cpumask_var(pinst->cpumask.pcpu); | |
16295bec | 1109 | goto err_free_inst; |
33e54450 | 1110 | } |
e15bacbe DK |
1111 | if (!padata_validate_cpumask(pinst, pcpumask) || |
1112 | !padata_validate_cpumask(pinst, cbcpumask)) | |
1113 | goto err_free_masks; | |
1114 | ||
1115 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); | |
1116 | if (!pd) | |
1117 | goto err_free_masks; | |
74781387 | 1118 | |
16295bec SK |
1119 | rcu_assign_pointer(pinst->pd, pd); |
1120 | ||
1121 | pinst->wq = wq; | |
1122 | ||
e15bacbe DK |
1123 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
1124 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
1125 | |
1126 | pinst->flags = 0; | |
1127 | ||
e2cb2f1c | 1128 | #ifdef CONFIG_HOTPLUG_CPU |
16295bec SK |
1129 | pinst->cpu_notifier.notifier_call = padata_cpu_callback; |
1130 | pinst->cpu_notifier.priority = 0; | |
e2cb2f1c SK |
1131 | register_hotcpu_notifier(&pinst->cpu_notifier); |
1132 | #endif | |
16295bec | 1133 | |
6751fb3c SK |
1134 | put_online_cpus(); |
1135 | ||
e15bacbe | 1136 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 1137 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1138 | mutex_init(&pinst->lock); |
1139 | ||
1140 | return pinst; | |
1141 | ||
e15bacbe DK |
1142 | err_free_masks: |
1143 | free_cpumask_var(pinst->cpumask.pcpu); | |
1144 | free_cpumask_var(pinst->cpumask.cbcpu); | |
16295bec SK |
1145 | err_free_inst: |
1146 | kfree(pinst); | |
6751fb3c | 1147 | put_online_cpus(); |
16295bec SK |
1148 | err: |
1149 | return NULL; | |
1150 | } | |
e15bacbe | 1151 | EXPORT_SYMBOL(__padata_alloc); |
16295bec | 1152 | |
0198ffd1 | 1153 | /** |
16295bec SK |
1154 | * padata_free - free a padata instance |
1155 | * | |
0198ffd1 | 1156 | * @padata_inst: padata instance to free |
16295bec SK |
1157 | */ |
1158 | void padata_free(struct padata_instance *pinst) | |
1159 | { | |
5e017dc3 | 1160 | kobject_put(&pinst->kobj); |
16295bec SK |
1161 | } |
1162 | EXPORT_SYMBOL(padata_free); |