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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 | ||
2dc9b5db | 49 | static int padata_cpu_hash(struct parallel_data *pd) |
16295bec | 50 | { |
0b6b098e | 51 | unsigned int seq_nr; |
16295bec | 52 | int cpu_index; |
16295bec SK |
53 | |
54 | /* | |
55 | * Hash the sequence numbers to the cpus by taking | |
56 | * seq_nr mod. number of cpus in use. | |
57 | */ | |
2dc9b5db | 58 | |
0b6b098e MK |
59 | seq_nr = atomic_inc_return(&pd->seq_nr); |
60 | cpu_index = seq_nr % cpumask_weight(pd->cpumask.pcpu); | |
16295bec SK |
61 | |
62 | return padata_index_to_cpu(pd, cpu_index); | |
63 | } | |
64 | ||
e15bacbe | 65 | static void padata_parallel_worker(struct work_struct *parallel_work) |
16295bec | 66 | { |
e15bacbe | 67 | struct padata_parallel_queue *pqueue; |
16295bec SK |
68 | LIST_HEAD(local_list); |
69 | ||
70 | local_bh_disable(); | |
e15bacbe DK |
71 | pqueue = container_of(parallel_work, |
72 | struct padata_parallel_queue, work); | |
16295bec | 73 | |
e15bacbe DK |
74 | spin_lock(&pqueue->parallel.lock); |
75 | list_replace_init(&pqueue->parallel.list, &local_list); | |
76 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
77 | |
78 | while (!list_empty(&local_list)) { | |
79 | struct padata_priv *padata; | |
80 | ||
81 | padata = list_entry(local_list.next, | |
82 | struct padata_priv, list); | |
83 | ||
84 | list_del_init(&padata->list); | |
85 | ||
86 | padata->parallel(padata); | |
87 | } | |
88 | ||
89 | local_bh_enable(); | |
90 | } | |
91 | ||
0198ffd1 | 92 | /** |
16295bec SK |
93 | * padata_do_parallel - padata parallelization function |
94 | * | |
95 | * @pinst: padata instance | |
96 | * @padata: object to be parallelized | |
97 | * @cb_cpu: cpu the serialization callback function will run on, | |
e15bacbe | 98 | * must be in the serial cpumask of padata(i.e. cpumask.cbcpu). |
16295bec SK |
99 | * |
100 | * The parallelization callback function will run with BHs off. | |
101 | * Note: Every object which is parallelized by padata_do_parallel | |
102 | * must be seen by padata_do_serial. | |
103 | */ | |
104 | int padata_do_parallel(struct padata_instance *pinst, | |
105 | struct padata_priv *padata, int cb_cpu) | |
106 | { | |
107 | int target_cpu, err; | |
e15bacbe | 108 | struct padata_parallel_queue *queue; |
16295bec SK |
109 | struct parallel_data *pd; |
110 | ||
111 | rcu_read_lock_bh(); | |
112 | ||
c0e656b7 | 113 | pd = rcu_dereference_bh(pinst->pd); |
16295bec | 114 | |
83f619f3 | 115 | err = -EINVAL; |
7424713b | 116 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
117 | goto out; |
118 | ||
e15bacbe | 119 | if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu)) |
16295bec SK |
120 | goto out; |
121 | ||
122 | err = -EBUSY; | |
123 | if ((pinst->flags & PADATA_RESET)) | |
124 | goto out; | |
125 | ||
126 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
127 | goto out; | |
128 | ||
83f619f3 | 129 | err = 0; |
16295bec SK |
130 | atomic_inc(&pd->refcnt); |
131 | padata->pd = pd; | |
132 | padata->cb_cpu = cb_cpu; | |
133 | ||
2dc9b5db | 134 | target_cpu = padata_cpu_hash(pd); |
350ef88e | 135 | padata->cpu = target_cpu; |
e15bacbe | 136 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
137 | |
138 | spin_lock(&queue->parallel.lock); | |
139 | list_add_tail(&padata->list, &queue->parallel.list); | |
140 | spin_unlock(&queue->parallel.lock); | |
141 | ||
e15bacbe | 142 | queue_work_on(target_cpu, pinst->wq, &queue->work); |
16295bec SK |
143 | |
144 | out: | |
145 | rcu_read_unlock_bh(); | |
146 | ||
147 | return err; | |
148 | } | |
149 | EXPORT_SYMBOL(padata_do_parallel); | |
150 | ||
0198ffd1 SK |
151 | /* |
152 | * padata_get_next - Get the next object that needs serialization. | |
153 | * | |
154 | * Return values are: | |
155 | * | |
156 | * A pointer to the control struct of the next object that needs | |
157 | * serialization, if present in one of the percpu reorder queues. | |
158 | * | |
0198ffd1 SK |
159 | * -EINPROGRESS, if the next object that needs serialization will |
160 | * be parallel processed by another cpu and is not yet present in | |
161 | * the cpu's reorder queue. | |
162 | * | |
163 | * -ENODATA, if this cpu has to do the parallel processing for | |
164 | * the next object. | |
165 | */ | |
16295bec SK |
166 | static struct padata_priv *padata_get_next(struct parallel_data *pd) |
167 | { | |
5f1a8c1b | 168 | int cpu, num_cpus; |
2dc9b5db | 169 | unsigned int next_nr, next_index; |
f0fcf200 | 170 | struct padata_parallel_queue *next_queue; |
16295bec SK |
171 | struct padata_priv *padata; |
172 | struct padata_list *reorder; | |
173 | ||
e15bacbe | 174 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
16295bec | 175 | |
5f1a8c1b SK |
176 | /* |
177 | * Calculate the percpu reorder queue and the sequence | |
178 | * number of the next object. | |
179 | */ | |
180 | next_nr = pd->processed; | |
181 | next_index = next_nr % num_cpus; | |
182 | cpu = padata_index_to_cpu(pd, next_index); | |
e15bacbe | 183 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
5f1a8c1b | 184 | |
16295bec SK |
185 | reorder = &next_queue->reorder; |
186 | ||
de5540d0 | 187 | spin_lock(&reorder->lock); |
16295bec SK |
188 | if (!list_empty(&reorder->list)) { |
189 | padata = list_entry(reorder->list.next, | |
190 | struct padata_priv, list); | |
191 | ||
16295bec SK |
192 | list_del_init(&padata->list); |
193 | atomic_dec(&pd->reorder_objects); | |
16295bec | 194 | |
5f1a8c1b | 195 | pd->processed++; |
16295bec | 196 | |
de5540d0 | 197 | spin_unlock(&reorder->lock); |
16295bec SK |
198 | goto out; |
199 | } | |
de5540d0 | 200 | spin_unlock(&reorder->lock); |
16295bec | 201 | |
f0fcf200 | 202 | if (__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index) { |
16295bec SK |
203 | padata = ERR_PTR(-ENODATA); |
204 | goto out; | |
205 | } | |
206 | ||
207 | padata = ERR_PTR(-EINPROGRESS); | |
208 | out: | |
209 | return padata; | |
210 | } | |
211 | ||
212 | static void padata_reorder(struct parallel_data *pd) | |
213 | { | |
3047817b | 214 | int cb_cpu; |
16295bec | 215 | struct padata_priv *padata; |
e15bacbe | 216 | struct padata_serial_queue *squeue; |
16295bec SK |
217 | struct padata_instance *pinst = pd->pinst; |
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) { | |
233 | padata = padata_get_next(pd); | |
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 | */ |
69b34844 | 240 | if (PTR_ERR(padata) == -EINPROGRESS) |
16295bec SK |
241 | break; |
242 | ||
0198ffd1 SK |
243 | /* |
244 | * This cpu has to do the parallel processing of the next | |
245 | * object. It's waiting in the cpu's parallelization queue, | |
25985edc | 246 | * so exit immediately. |
0198ffd1 | 247 | */ |
16295bec | 248 | if (PTR_ERR(padata) == -ENODATA) { |
d46a5ac7 | 249 | del_timer(&pd->timer); |
16295bec | 250 | spin_unlock_bh(&pd->lock); |
d46a5ac7 | 251 | return; |
16295bec SK |
252 | } |
253 | ||
3047817b SK |
254 | cb_cpu = padata->cb_cpu; |
255 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 256 | |
e15bacbe DK |
257 | spin_lock(&squeue->serial.lock); |
258 | list_add_tail(&padata->list, &squeue->serial.list); | |
259 | spin_unlock(&squeue->serial.lock); | |
16295bec | 260 | |
3047817b | 261 | queue_work_on(cb_cpu, pinst->wq, &squeue->work); |
16295bec SK |
262 | } |
263 | ||
264 | spin_unlock_bh(&pd->lock); | |
265 | ||
0198ffd1 SK |
266 | /* |
267 | * The next object that needs serialization might have arrived to | |
268 | * the reorder queues in the meantime, we will be called again | |
25985edc | 269 | * from the timer function if no one else cares for it. |
cf144f81 DJ |
270 | * |
271 | * Ensure reorder_objects is read after pd->lock is dropped so we see | |
272 | * an increment from another task in padata_do_serial. Pairs with | |
273 | * smp_mb__after_atomic in padata_do_serial. | |
0198ffd1 | 274 | */ |
cf144f81 | 275 | smp_mb(); |
d46a5ac7 SK |
276 | if (atomic_read(&pd->reorder_objects) |
277 | && !(pinst->flags & PADATA_RESET)) | |
278 | mod_timer(&pd->timer, jiffies + HZ); | |
279 | else | |
280 | del_timer(&pd->timer); | |
16295bec | 281 | |
16295bec SK |
282 | return; |
283 | } | |
284 | ||
cf5868c8 MK |
285 | static void invoke_padata_reorder(struct work_struct *work) |
286 | { | |
287 | struct padata_parallel_queue *pqueue; | |
288 | struct parallel_data *pd; | |
289 | ||
290 | local_bh_disable(); | |
291 | pqueue = container_of(work, struct padata_parallel_queue, reorder_work); | |
292 | pd = pqueue->pd; | |
293 | padata_reorder(pd); | |
294 | local_bh_enable(); | |
295 | } | |
296 | ||
e99e88a9 | 297 | static void padata_reorder_timer(struct timer_list *t) |
d46a5ac7 | 298 | { |
e99e88a9 | 299 | struct parallel_data *pd = from_timer(pd, t, timer); |
cf5868c8 MK |
300 | unsigned int weight; |
301 | int target_cpu, cpu; | |
d46a5ac7 | 302 | |
cf5868c8 MK |
303 | cpu = get_cpu(); |
304 | ||
305 | /* We don't lock pd here to not interfere with parallel processing | |
306 | * padata_reorder() calls on other CPUs. We just need any CPU out of | |
307 | * the cpumask.pcpu set. It would be nice if it's the right one but | |
308 | * it doesn't matter if we're off to the next one by using an outdated | |
309 | * pd->processed value. | |
310 | */ | |
311 | weight = cpumask_weight(pd->cpumask.pcpu); | |
312 | target_cpu = padata_index_to_cpu(pd, pd->processed % weight); | |
313 | ||
314 | /* ensure to call the reorder callback on the correct CPU */ | |
315 | if (cpu != target_cpu) { | |
316 | struct padata_parallel_queue *pqueue; | |
317 | struct padata_instance *pinst; | |
318 | ||
319 | /* The timer function is serialized wrt itself -- no locking | |
320 | * needed. | |
321 | */ | |
322 | pinst = pd->pinst; | |
323 | pqueue = per_cpu_ptr(pd->pqueue, target_cpu); | |
324 | queue_work_on(target_cpu, pinst->wq, &pqueue->reorder_work); | |
325 | } else { | |
326 | padata_reorder(pd); | |
327 | } | |
328 | ||
329 | put_cpu(); | |
d46a5ac7 SK |
330 | } |
331 | ||
e15bacbe | 332 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 333 | { |
e15bacbe | 334 | struct padata_serial_queue *squeue; |
16295bec SK |
335 | struct parallel_data *pd; |
336 | LIST_HEAD(local_list); | |
337 | ||
338 | local_bh_disable(); | |
e15bacbe DK |
339 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
340 | pd = squeue->pd; | |
16295bec | 341 | |
e15bacbe DK |
342 | spin_lock(&squeue->serial.lock); |
343 | list_replace_init(&squeue->serial.list, &local_list); | |
344 | spin_unlock(&squeue->serial.lock); | |
16295bec SK |
345 | |
346 | while (!list_empty(&local_list)) { | |
347 | struct padata_priv *padata; | |
348 | ||
349 | padata = list_entry(local_list.next, | |
350 | struct padata_priv, list); | |
351 | ||
352 | list_del_init(&padata->list); | |
353 | ||
354 | padata->serial(padata); | |
355 | atomic_dec(&pd->refcnt); | |
356 | } | |
357 | local_bh_enable(); | |
358 | } | |
359 | ||
0198ffd1 | 360 | /** |
16295bec SK |
361 | * padata_do_serial - padata serialization function |
362 | * | |
363 | * @padata: object to be serialized. | |
364 | * | |
365 | * padata_do_serial must be called for every parallelized object. | |
366 | * The serialization callback function will run with BHs off. | |
367 | */ | |
368 | void padata_do_serial(struct padata_priv *padata) | |
369 | { | |
370 | int cpu; | |
e15bacbe | 371 | struct padata_parallel_queue *pqueue; |
16295bec | 372 | struct parallel_data *pd; |
350ef88e | 373 | int reorder_via_wq = 0; |
16295bec SK |
374 | |
375 | pd = padata->pd; | |
376 | ||
377 | cpu = get_cpu(); | |
350ef88e MK |
378 | |
379 | /* We need to run on the same CPU padata_do_parallel(.., padata, ..) | |
380 | * was called on -- or, at least, enqueue the padata object into the | |
381 | * correct per-cpu queue. | |
382 | */ | |
383 | if (cpu != padata->cpu) { | |
384 | reorder_via_wq = 1; | |
385 | cpu = padata->cpu; | |
386 | } | |
387 | ||
e15bacbe | 388 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec | 389 | |
e15bacbe | 390 | spin_lock(&pqueue->reorder.lock); |
16295bec | 391 | atomic_inc(&pd->reorder_objects); |
e15bacbe DK |
392 | list_add_tail(&padata->list, &pqueue->reorder.list); |
393 | spin_unlock(&pqueue->reorder.lock); | |
16295bec | 394 | |
cf144f81 DJ |
395 | /* |
396 | * Ensure the atomic_inc of reorder_objects above is ordered correctly | |
397 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb | |
398 | * in padata_reorder. | |
399 | */ | |
400 | smp_mb__after_atomic(); | |
401 | ||
16295bec SK |
402 | put_cpu(); |
403 | ||
350ef88e MK |
404 | /* If we're running on the wrong CPU, call padata_reorder() via a |
405 | * kernel worker. | |
406 | */ | |
407 | if (reorder_via_wq) | |
408 | queue_work_on(cpu, pd->pinst->wq, &pqueue->reorder_work); | |
409 | else | |
410 | padata_reorder(pd); | |
16295bec SK |
411 | } |
412 | EXPORT_SYMBOL(padata_do_serial); | |
413 | ||
e15bacbe DK |
414 | static int padata_setup_cpumasks(struct parallel_data *pd, |
415 | const struct cpumask *pcpumask, | |
416 | const struct cpumask *cbcpumask) | |
16295bec | 417 | { |
e15bacbe DK |
418 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
419 | return -ENOMEM; | |
16295bec | 420 | |
13614e0f | 421 | cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_online_mask); |
e15bacbe | 422 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) { |
07a77929 | 423 | free_cpumask_var(pd->cpumask.pcpu); |
e15bacbe DK |
424 | return -ENOMEM; |
425 | } | |
16295bec | 426 | |
13614e0f | 427 | cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_online_mask); |
e15bacbe DK |
428 | return 0; |
429 | } | |
16295bec | 430 | |
e15bacbe DK |
431 | static void __padata_list_init(struct padata_list *pd_list) |
432 | { | |
433 | INIT_LIST_HEAD(&pd_list->list); | |
434 | spin_lock_init(&pd_list->lock); | |
435 | } | |
16295bec | 436 | |
e15bacbe DK |
437 | /* Initialize all percpu queues used by serial workers */ |
438 | static void padata_init_squeues(struct parallel_data *pd) | |
439 | { | |
440 | int cpu; | |
441 | struct padata_serial_queue *squeue; | |
7b389b2c | 442 | |
e15bacbe DK |
443 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
444 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
445 | squeue->pd = pd; | |
446 | __padata_list_init(&squeue->serial); | |
447 | INIT_WORK(&squeue->work, padata_serial_worker); | |
448 | } | |
449 | } | |
16295bec | 450 | |
e15bacbe DK |
451 | /* Initialize all percpu queues used by parallel workers */ |
452 | static void padata_init_pqueues(struct parallel_data *pd) | |
453 | { | |
2dc9b5db | 454 | int cpu_index, cpu; |
e15bacbe | 455 | struct padata_parallel_queue *pqueue; |
16295bec | 456 | |
e15bacbe | 457 | cpu_index = 0; |
1bd845bc | 458 | for_each_possible_cpu(cpu) { |
e15bacbe | 459 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
1bd845bc MK |
460 | |
461 | if (!cpumask_test_cpu(cpu, pd->cpumask.pcpu)) { | |
462 | pqueue->cpu_index = -1; | |
463 | continue; | |
464 | } | |
465 | ||
e15bacbe DK |
466 | pqueue->pd = pd; |
467 | pqueue->cpu_index = cpu_index; | |
7b389b2c | 468 | cpu_index++; |
16295bec | 469 | |
e15bacbe DK |
470 | __padata_list_init(&pqueue->reorder); |
471 | __padata_list_init(&pqueue->parallel); | |
472 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
cf5868c8 | 473 | INIT_WORK(&pqueue->reorder_work, invoke_padata_reorder); |
e15bacbe | 474 | atomic_set(&pqueue->num_obj, 0); |
16295bec | 475 | } |
e15bacbe | 476 | } |
16295bec | 477 | |
e15bacbe DK |
478 | /* Allocate and initialize the internal cpumask dependend resources. */ |
479 | static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, | |
480 | const struct cpumask *pcpumask, | |
481 | const struct cpumask *cbcpumask) | |
482 | { | |
483 | struct parallel_data *pd; | |
16295bec | 484 | |
e15bacbe DK |
485 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
486 | if (!pd) | |
487 | goto err; | |
16295bec | 488 | |
e15bacbe DK |
489 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
490 | if (!pd->pqueue) | |
491 | goto err_free_pd; | |
492 | ||
493 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
494 | if (!pd->squeue) | |
495 | goto err_free_pqueue; | |
496 | if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0) | |
497 | goto err_free_squeue; | |
16295bec | 498 | |
e15bacbe DK |
499 | padata_init_pqueues(pd); |
500 | padata_init_squeues(pd); | |
e99e88a9 | 501 | timer_setup(&pd->timer, padata_reorder_timer, 0); |
0b6b098e | 502 | atomic_set(&pd->seq_nr, -1); |
16295bec SK |
503 | atomic_set(&pd->reorder_objects, 0); |
504 | atomic_set(&pd->refcnt, 0); | |
505 | pd->pinst = pinst; | |
506 | spin_lock_init(&pd->lock); | |
507 | ||
508 | return pd; | |
509 | ||
e15bacbe DK |
510 | err_free_squeue: |
511 | free_percpu(pd->squeue); | |
512 | err_free_pqueue: | |
513 | free_percpu(pd->pqueue); | |
16295bec SK |
514 | err_free_pd: |
515 | kfree(pd); | |
516 | err: | |
517 | return NULL; | |
518 | } | |
519 | ||
520 | static void padata_free_pd(struct parallel_data *pd) | |
521 | { | |
e15bacbe DK |
522 | free_cpumask_var(pd->cpumask.pcpu); |
523 | free_cpumask_var(pd->cpumask.cbcpu); | |
524 | free_percpu(pd->pqueue); | |
525 | free_percpu(pd->squeue); | |
16295bec SK |
526 | kfree(pd); |
527 | } | |
528 | ||
0198ffd1 | 529 | /* Flush all objects out of the padata queues. */ |
2b73b07a SK |
530 | static void padata_flush_queues(struct parallel_data *pd) |
531 | { | |
532 | int cpu; | |
e15bacbe DK |
533 | struct padata_parallel_queue *pqueue; |
534 | struct padata_serial_queue *squeue; | |
2b73b07a | 535 | |
e15bacbe DK |
536 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
537 | pqueue = per_cpu_ptr(pd->pqueue, cpu); | |
538 | flush_work(&pqueue->work); | |
2b73b07a SK |
539 | } |
540 | ||
541 | del_timer_sync(&pd->timer); | |
542 | ||
543 | if (atomic_read(&pd->reorder_objects)) | |
544 | padata_reorder(pd); | |
545 | ||
e15bacbe DK |
546 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
547 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
548 | flush_work(&squeue->work); | |
2b73b07a SK |
549 | } |
550 | ||
551 | BUG_ON(atomic_read(&pd->refcnt) != 0); | |
552 | } | |
553 | ||
4c879170 SK |
554 | static void __padata_start(struct padata_instance *pinst) |
555 | { | |
556 | pinst->flags |= PADATA_INIT; | |
557 | } | |
558 | ||
ee836555 SK |
559 | static void __padata_stop(struct padata_instance *pinst) |
560 | { | |
561 | if (!(pinst->flags & PADATA_INIT)) | |
562 | return; | |
563 | ||
564 | pinst->flags &= ~PADATA_INIT; | |
565 | ||
566 | synchronize_rcu(); | |
567 | ||
568 | get_online_cpus(); | |
569 | padata_flush_queues(pinst->pd); | |
570 | put_online_cpus(); | |
571 | } | |
572 | ||
25985edc | 573 | /* Replace the internal control structure with a new one. */ |
16295bec SK |
574 | static void padata_replace(struct padata_instance *pinst, |
575 | struct parallel_data *pd_new) | |
576 | { | |
577 | struct parallel_data *pd_old = pinst->pd; | |
e15bacbe | 578 | int notification_mask = 0; |
16295bec SK |
579 | |
580 | pinst->flags |= PADATA_RESET; | |
581 | ||
582 | rcu_assign_pointer(pinst->pd, pd_new); | |
583 | ||
584 | synchronize_rcu(); | |
585 | ||
e15bacbe DK |
586 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) |
587 | notification_mask |= PADATA_CPU_PARALLEL; | |
588 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) | |
589 | notification_mask |= PADATA_CPU_SERIAL; | |
590 | ||
2b73b07a | 591 | padata_flush_queues(pd_old); |
16295bec SK |
592 | padata_free_pd(pd_old); |
593 | ||
e15bacbe DK |
594 | if (notification_mask) |
595 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
c635696c SK |
596 | notification_mask, |
597 | &pd_new->cpumask); | |
16295bec SK |
598 | |
599 | pinst->flags &= ~PADATA_RESET; | |
600 | } | |
601 | ||
0198ffd1 | 602 | /** |
e15bacbe DK |
603 | * padata_register_cpumask_notifier - Registers a notifier that will be called |
604 | * if either pcpu or cbcpu or both cpumasks change. | |
16295bec | 605 | * |
e15bacbe DK |
606 | * @pinst: A poineter to padata instance |
607 | * @nblock: A pointer to notifier block. | |
16295bec | 608 | */ |
e15bacbe DK |
609 | int padata_register_cpumask_notifier(struct padata_instance *pinst, |
610 | struct notifier_block *nblock) | |
16295bec | 611 | { |
e15bacbe DK |
612 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, |
613 | nblock); | |
614 | } | |
615 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
616 | ||
617 | /** | |
618 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
619 | * registered earlier using padata_register_cpumask_notifier | |
620 | * | |
621 | * @pinst: A pointer to data instance. | |
622 | * @nlock: A pointer to notifier block. | |
623 | */ | |
624 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
625 | struct notifier_block *nblock) | |
626 | { | |
627 | return blocking_notifier_chain_unregister( | |
628 | &pinst->cpumask_change_notifier, | |
629 | nblock); | |
630 | } | |
631 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
632 | ||
633 | ||
33e54450 SK |
634 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
635 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
636 | const struct cpumask *cpumask) | |
637 | { | |
13614e0f | 638 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
639 | pinst->flags |= PADATA_INVALID; |
640 | return false; | |
641 | } | |
642 | ||
643 | pinst->flags &= ~PADATA_INVALID; | |
644 | return true; | |
645 | } | |
646 | ||
65ff577e SK |
647 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
648 | cpumask_var_t pcpumask, | |
649 | cpumask_var_t cbcpumask) | |
650 | { | |
651 | int valid; | |
16295bec | 652 | struct parallel_data *pd; |
65ff577e SK |
653 | |
654 | valid = padata_validate_cpumask(pinst, pcpumask); | |
655 | if (!valid) { | |
656 | __padata_stop(pinst); | |
657 | goto out_replace; | |
658 | } | |
659 | ||
660 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
661 | if (!valid) | |
662 | __padata_stop(pinst); | |
663 | ||
664 | out_replace: | |
665 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); | |
666 | if (!pd) | |
667 | return -ENOMEM; | |
668 | ||
669 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); | |
670 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
671 | ||
672 | padata_replace(pinst, pd); | |
673 | ||
674 | if (valid) | |
675 | __padata_start(pinst); | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
e15bacbe DK |
680 | /** |
681 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
682 | * equivalent to @cpumask. | |
16295bec SK |
683 | * |
684 | * @pinst: padata instance | |
e15bacbe DK |
685 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
686 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
687 | * @cpumask: the cpumask to use |
688 | */ | |
e15bacbe DK |
689 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
690 | cpumask_var_t cpumask) | |
691 | { | |
692 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
693 | int err = -EINVAL; |
694 | ||
695 | mutex_lock(&pinst->lock); | |
6751fb3c SK |
696 | get_online_cpus(); |
697 | ||
e15bacbe DK |
698 | switch (cpumask_type) { |
699 | case PADATA_CPU_PARALLEL: | |
700 | serial_mask = pinst->cpumask.cbcpu; | |
701 | parallel_mask = cpumask; | |
702 | break; | |
703 | case PADATA_CPU_SERIAL: | |
704 | parallel_mask = pinst->cpumask.pcpu; | |
705 | serial_mask = cpumask; | |
706 | break; | |
707 | default: | |
65ff577e | 708 | goto out; |
16295bec SK |
709 | } |
710 | ||
65ff577e | 711 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
712 | |
713 | out: | |
6751fb3c | 714 | put_online_cpus(); |
16295bec SK |
715 | mutex_unlock(&pinst->lock); |
716 | ||
717 | return err; | |
718 | } | |
719 | EXPORT_SYMBOL(padata_set_cpumask); | |
720 | ||
19d795b6 AB |
721 | /** |
722 | * padata_start - start the parallel processing | |
723 | * | |
724 | * @pinst: padata instance to start | |
725 | */ | |
726 | int padata_start(struct padata_instance *pinst) | |
727 | { | |
728 | int err = 0; | |
729 | ||
730 | mutex_lock(&pinst->lock); | |
731 | ||
732 | if (pinst->flags & PADATA_INVALID) | |
733 | err = -EINVAL; | |
734 | ||
8ddab428 | 735 | __padata_start(pinst); |
19d795b6 AB |
736 | |
737 | mutex_unlock(&pinst->lock); | |
738 | ||
739 | return err; | |
740 | } | |
741 | EXPORT_SYMBOL(padata_start); | |
742 | ||
743 | /** | |
744 | * padata_stop - stop the parallel processing | |
745 | * | |
746 | * @pinst: padata instance to stop | |
747 | */ | |
748 | void padata_stop(struct padata_instance *pinst) | |
749 | { | |
750 | mutex_lock(&pinst->lock); | |
751 | __padata_stop(pinst); | |
752 | mutex_unlock(&pinst->lock); | |
753 | } | |
754 | EXPORT_SYMBOL(padata_stop); | |
755 | ||
756 | #ifdef CONFIG_HOTPLUG_CPU | |
757 | ||
16295bec SK |
758 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
759 | { | |
760 | struct parallel_data *pd; | |
761 | ||
13614e0f | 762 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe DK |
763 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
764 | pinst->cpumask.cbcpu); | |
16295bec SK |
765 | if (!pd) |
766 | return -ENOMEM; | |
767 | ||
768 | padata_replace(pinst, pd); | |
33e54450 | 769 | |
e15bacbe DK |
770 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
771 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 772 | __padata_start(pinst); |
16295bec SK |
773 | } |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
16295bec SK |
778 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
779 | { | |
33e54450 | 780 | struct parallel_data *pd = NULL; |
16295bec SK |
781 | |
782 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { | |
33e54450 | 783 | |
e15bacbe | 784 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 785 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 786 | __padata_stop(pinst); |
33e54450 | 787 | |
e15bacbe DK |
788 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
789 | pinst->cpumask.cbcpu); | |
16295bec SK |
790 | if (!pd) |
791 | return -ENOMEM; | |
792 | ||
793 | padata_replace(pinst, pd); | |
96120905 SK |
794 | |
795 | cpumask_clear_cpu(cpu, pd->cpumask.cbcpu); | |
796 | cpumask_clear_cpu(cpu, pd->cpumask.pcpu); | |
16295bec SK |
797 | } |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
e15bacbe | 802 | /** |
25985edc | 803 | * padata_remove_cpu - remove a cpu from the one or both(serial and parallel) |
e15bacbe | 804 | * padata cpumasks. |
16295bec SK |
805 | * |
806 | * @pinst: padata instance | |
807 | * @cpu: cpu to remove | |
e15bacbe DK |
808 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
809 | * The @mask may be any combination of the following flags: | |
810 | * PADATA_CPU_SERIAL - serial cpumask | |
811 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 812 | */ |
e15bacbe | 813 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
814 | { |
815 | int err; | |
816 | ||
e15bacbe DK |
817 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
818 | return -EINVAL; | |
819 | ||
16295bec SK |
820 | mutex_lock(&pinst->lock); |
821 | ||
6751fb3c | 822 | get_online_cpus(); |
e15bacbe DK |
823 | if (mask & PADATA_CPU_SERIAL) |
824 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
825 | if (mask & PADATA_CPU_PARALLEL) | |
826 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
827 | ||
16295bec | 828 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 829 | put_online_cpus(); |
16295bec SK |
830 | |
831 | mutex_unlock(&pinst->lock); | |
832 | ||
833 | return err; | |
834 | } | |
835 | EXPORT_SYMBOL(padata_remove_cpu); | |
836 | ||
e15bacbe DK |
837 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
838 | { | |
839 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
840 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
841 | } | |
842 | ||
30e92153 | 843 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 844 | { |
16295bec | 845 | struct padata_instance *pinst; |
30e92153 | 846 | int ret; |
16295bec | 847 | |
30e92153 SAS |
848 | pinst = hlist_entry_safe(node, struct padata_instance, node); |
849 | if (!pinst_has_cpu(pinst, cpu)) | |
850 | return 0; | |
16295bec | 851 | |
30e92153 SAS |
852 | mutex_lock(&pinst->lock); |
853 | ret = __padata_add_cpu(pinst, cpu); | |
854 | mutex_unlock(&pinst->lock); | |
855 | return ret; | |
856 | } | |
16295bec | 857 | |
30e92153 SAS |
858 | static int padata_cpu_prep_down(unsigned int cpu, struct hlist_node *node) |
859 | { | |
860 | struct padata_instance *pinst; | |
861 | int ret; | |
862 | ||
863 | pinst = hlist_entry_safe(node, struct padata_instance, node); | |
864 | if (!pinst_has_cpu(pinst, cpu)) | |
865 | return 0; | |
16295bec | 866 | |
30e92153 SAS |
867 | mutex_lock(&pinst->lock); |
868 | ret = __padata_remove_cpu(pinst, cpu); | |
869 | mutex_unlock(&pinst->lock); | |
870 | return ret; | |
16295bec | 871 | } |
30e92153 SAS |
872 | |
873 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 874 | #endif |
16295bec | 875 | |
5e017dc3 DK |
876 | static void __padata_free(struct padata_instance *pinst) |
877 | { | |
878 | #ifdef CONFIG_HOTPLUG_CPU | |
30e92153 | 879 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node); |
5e017dc3 DK |
880 | #endif |
881 | ||
882 | padata_stop(pinst); | |
883 | padata_free_pd(pinst->pd); | |
884 | free_cpumask_var(pinst->cpumask.pcpu); | |
885 | free_cpumask_var(pinst->cpumask.cbcpu); | |
886 | kfree(pinst); | |
887 | } | |
888 | ||
889 | #define kobj2pinst(_kobj) \ | |
890 | container_of(_kobj, struct padata_instance, kobj) | |
891 | #define attr2pentry(_attr) \ | |
892 | container_of(_attr, struct padata_sysfs_entry, attr) | |
893 | ||
894 | static void padata_sysfs_release(struct kobject *kobj) | |
895 | { | |
896 | struct padata_instance *pinst = kobj2pinst(kobj); | |
897 | __padata_free(pinst); | |
898 | } | |
899 | ||
900 | struct padata_sysfs_entry { | |
901 | struct attribute attr; | |
902 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
903 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
904 | const char *, size_t); | |
905 | }; | |
906 | ||
907 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
908 | struct attribute *attr, char *buf) | |
909 | { | |
910 | struct cpumask *cpumask; | |
911 | ssize_t len; | |
912 | ||
913 | mutex_lock(&pinst->lock); | |
914 | if (!strcmp(attr->name, "serial_cpumask")) | |
915 | cpumask = pinst->cpumask.cbcpu; | |
916 | else | |
917 | cpumask = pinst->cpumask.pcpu; | |
918 | ||
4497da6f TH |
919 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
920 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 921 | mutex_unlock(&pinst->lock); |
4497da6f | 922 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
923 | } |
924 | ||
925 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
926 | struct attribute *attr, | |
927 | const char *buf, size_t count) | |
928 | { | |
929 | cpumask_var_t new_cpumask; | |
930 | ssize_t ret; | |
931 | int mask_type; | |
932 | ||
933 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
934 | return -ENOMEM; | |
935 | ||
936 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
937 | nr_cpumask_bits); | |
938 | if (ret < 0) | |
939 | goto out; | |
940 | ||
941 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
942 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
943 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
944 | if (!ret) | |
945 | ret = count; | |
946 | ||
947 | out: | |
948 | free_cpumask_var(new_cpumask); | |
949 | return ret; | |
950 | } | |
951 | ||
952 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
953 | static struct padata_sysfs_entry _name##_attr = \ | |
954 | __ATTR(_name, 0644, _show_name, _store_name) | |
955 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
956 | static struct padata_sysfs_entry _name##_attr = \ | |
957 | __ATTR(_name, 0400, _show_name, NULL) | |
958 | ||
959 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
960 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
961 | ||
962 | /* | |
963 | * Padata sysfs provides the following objects: | |
964 | * serial_cpumask [RW] - cpumask for serial workers | |
965 | * parallel_cpumask [RW] - cpumask for parallel workers | |
966 | */ | |
967 | static struct attribute *padata_default_attrs[] = { | |
968 | &serial_cpumask_attr.attr, | |
969 | ¶llel_cpumask_attr.attr, | |
970 | NULL, | |
971 | }; | |
2064fbc7 | 972 | ATTRIBUTE_GROUPS(padata_default); |
5e017dc3 DK |
973 | |
974 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
975 | struct attribute *attr, char *buf) | |
976 | { | |
977 | struct padata_instance *pinst; | |
978 | struct padata_sysfs_entry *pentry; | |
979 | ssize_t ret = -EIO; | |
980 | ||
981 | pinst = kobj2pinst(kobj); | |
982 | pentry = attr2pentry(attr); | |
983 | if (pentry->show) | |
984 | ret = pentry->show(pinst, attr, buf); | |
985 | ||
986 | return ret; | |
987 | } | |
988 | ||
989 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
990 | const char *buf, size_t count) | |
991 | { | |
992 | struct padata_instance *pinst; | |
993 | struct padata_sysfs_entry *pentry; | |
994 | ssize_t ret = -EIO; | |
995 | ||
996 | pinst = kobj2pinst(kobj); | |
997 | pentry = attr2pentry(attr); | |
998 | if (pentry->show) | |
999 | ret = pentry->store(pinst, attr, buf, count); | |
1000 | ||
1001 | return ret; | |
1002 | } | |
1003 | ||
1004 | static const struct sysfs_ops padata_sysfs_ops = { | |
1005 | .show = padata_sysfs_show, | |
1006 | .store = padata_sysfs_store, | |
1007 | }; | |
1008 | ||
1009 | static struct kobj_type padata_attr_type = { | |
1010 | .sysfs_ops = &padata_sysfs_ops, | |
2064fbc7 | 1011 | .default_groups = padata_default_groups, |
5e017dc3 DK |
1012 | .release = padata_sysfs_release, |
1013 | }; | |
1014 | ||
e15bacbe | 1015 | /** |
e6cc1170 SK |
1016 | * padata_alloc - allocate and initialize a padata instance and specify |
1017 | * cpumasks for serial and parallel workers. | |
16295bec | 1018 | * |
16295bec | 1019 | * @wq: workqueue to use for the allocated padata instance |
e15bacbe DK |
1020 | * @pcpumask: cpumask that will be used for padata parallelization |
1021 | * @cbcpumask: cpumask that will be used for padata serialization | |
c5a81c8f SAS |
1022 | * |
1023 | * Must be called from a cpus_read_lock() protected region | |
16295bec | 1024 | */ |
9596695e TG |
1025 | static struct padata_instance *padata_alloc(struct workqueue_struct *wq, |
1026 | const struct cpumask *pcpumask, | |
1027 | const struct cpumask *cbcpumask) | |
16295bec | 1028 | { |
16295bec | 1029 | struct padata_instance *pinst; |
33e54450 | 1030 | struct parallel_data *pd = NULL; |
16295bec SK |
1031 | |
1032 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
1033 | if (!pinst) | |
1034 | goto err; | |
1035 | ||
e15bacbe | 1036 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) |
16295bec | 1037 | goto err_free_inst; |
e15bacbe DK |
1038 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
1039 | free_cpumask_var(pinst->cpumask.pcpu); | |
16295bec | 1040 | goto err_free_inst; |
33e54450 | 1041 | } |
e15bacbe DK |
1042 | if (!padata_validate_cpumask(pinst, pcpumask) || |
1043 | !padata_validate_cpumask(pinst, cbcpumask)) | |
1044 | goto err_free_masks; | |
16295bec | 1045 | |
e15bacbe DK |
1046 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
1047 | if (!pd) | |
1048 | goto err_free_masks; | |
74781387 | 1049 | |
16295bec SK |
1050 | rcu_assign_pointer(pinst->pd, pd); |
1051 | ||
1052 | pinst->wq = wq; | |
1053 | ||
e15bacbe DK |
1054 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
1055 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
1056 | |
1057 | pinst->flags = 0; | |
1058 | ||
e15bacbe | 1059 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 1060 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1061 | mutex_init(&pinst->lock); |
1062 | ||
b8b4a416 | 1063 | #ifdef CONFIG_HOTPLUG_CPU |
c5a81c8f | 1064 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node); |
b8b4a416 | 1065 | #endif |
16295bec SK |
1066 | return pinst; |
1067 | ||
e15bacbe DK |
1068 | err_free_masks: |
1069 | free_cpumask_var(pinst->cpumask.pcpu); | |
1070 | free_cpumask_var(pinst->cpumask.cbcpu); | |
16295bec SK |
1071 | err_free_inst: |
1072 | kfree(pinst); | |
1073 | err: | |
1074 | return NULL; | |
1075 | } | |
16295bec | 1076 | |
9596695e TG |
1077 | /** |
1078 | * padata_alloc_possible - Allocate and initialize padata instance. | |
1079 | * Use the cpu_possible_mask for serial and | |
1080 | * parallel workers. | |
1081 | * | |
1082 | * @wq: workqueue to use for the allocated padata instance | |
c5a81c8f SAS |
1083 | * |
1084 | * Must be called from a cpus_read_lock() protected region | |
9596695e TG |
1085 | */ |
1086 | struct padata_instance *padata_alloc_possible(struct workqueue_struct *wq) | |
1087 | { | |
c5a81c8f | 1088 | lockdep_assert_cpus_held(); |
9596695e TG |
1089 | return padata_alloc(wq, cpu_possible_mask, cpu_possible_mask); |
1090 | } | |
1091 | EXPORT_SYMBOL(padata_alloc_possible); | |
1092 | ||
0198ffd1 | 1093 | /** |
16295bec SK |
1094 | * padata_free - free a padata instance |
1095 | * | |
0198ffd1 | 1096 | * @padata_inst: padata instance to free |
16295bec SK |
1097 | */ |
1098 | void padata_free(struct padata_instance *pinst) | |
1099 | { | |
5e017dc3 | 1100 | kobject_put(&pinst->kobj); |
16295bec SK |
1101 | } |
1102 | EXPORT_SYMBOL(padata_free); | |
30e92153 SAS |
1103 | |
1104 | #ifdef CONFIG_HOTPLUG_CPU | |
1105 | ||
1106 | static __init int padata_driver_init(void) | |
1107 | { | |
1108 | int ret; | |
1109 | ||
1110 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", | |
1111 | padata_cpu_online, | |
1112 | padata_cpu_prep_down); | |
1113 | if (ret < 0) | |
1114 | return ret; | |
1115 | hp_online = ret; | |
1116 | return 0; | |
1117 | } | |
1118 | module_init(padata_driver_init); | |
1119 | ||
1120 | static __exit void padata_driver_exit(void) | |
1121 | { | |
1122 | cpuhp_remove_multi_state(hp_online); | |
1123 | } | |
1124 | module_exit(padata_driver_exit); | |
1125 | #endif |