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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 | 37 | |
b5b4d5d2 HX |
38 | static void padata_free_pd(struct parallel_data *pd); |
39 | ||
16295bec SK |
40 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) |
41 | { | |
42 | int cpu, target_cpu; | |
43 | ||
e15bacbe | 44 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
16295bec | 45 | for (cpu = 0; cpu < cpu_index; cpu++) |
e15bacbe | 46 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
16295bec SK |
47 | |
48 | return target_cpu; | |
49 | } | |
50 | ||
bfde23ce | 51 | static int padata_cpu_hash(struct parallel_data *pd, unsigned int seq_nr) |
16295bec | 52 | { |
16295bec SK |
53 | /* |
54 | * Hash the sequence numbers to the cpus by taking | |
55 | * seq_nr mod. number of cpus in use. | |
56 | */ | |
bfde23ce | 57 | int cpu_index = 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 | LIST_HEAD(local_list); |
66 | ||
67 | local_bh_disable(); | |
e15bacbe DK |
68 | pqueue = container_of(parallel_work, |
69 | struct padata_parallel_queue, work); | |
16295bec | 70 | |
e15bacbe DK |
71 | spin_lock(&pqueue->parallel.lock); |
72 | list_replace_init(&pqueue->parallel.list, &local_list); | |
73 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
74 | |
75 | while (!list_empty(&local_list)) { | |
76 | struct padata_priv *padata; | |
77 | ||
78 | padata = list_entry(local_list.next, | |
79 | struct padata_priv, list); | |
80 | ||
81 | list_del_init(&padata->list); | |
82 | ||
83 | padata->parallel(padata); | |
84 | } | |
85 | ||
86 | local_bh_enable(); | |
87 | } | |
88 | ||
0198ffd1 | 89 | /** |
16295bec SK |
90 | * padata_do_parallel - padata parallelization function |
91 | * | |
b77a06e6 | 92 | * @ps: padatashell |
16295bec | 93 | * @padata: object to be parallelized |
e6ce0e08 DJ |
94 | * @cb_cpu: pointer to the CPU that the serialization callback function should |
95 | * run on. If it's not in the serial cpumask of @pinst | |
96 | * (i.e. cpumask.cbcpu), this function selects a fallback CPU and if | |
97 | * none found, returns -EINVAL. | |
16295bec SK |
98 | * |
99 | * The parallelization callback function will run with BHs off. | |
100 | * Note: Every object which is parallelized by padata_do_parallel | |
101 | * must be seen by padata_do_serial. | |
102 | */ | |
b77a06e6 | 103 | int padata_do_parallel(struct padata_shell *ps, |
e6ce0e08 | 104 | struct padata_priv *padata, int *cb_cpu) |
16295bec | 105 | { |
b77a06e6 | 106 | struct padata_instance *pinst = ps->pinst; |
e6ce0e08 | 107 | int i, cpu, cpu_index, target_cpu, err; |
e15bacbe | 108 | struct padata_parallel_queue *queue; |
16295bec SK |
109 | struct parallel_data *pd; |
110 | ||
111 | rcu_read_lock_bh(); | |
112 | ||
b77a06e6 | 113 | pd = rcu_dereference_bh(ps->pd); |
16295bec | 114 | |
83f619f3 | 115 | err = -EINVAL; |
7424713b | 116 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
117 | goto out; |
118 | ||
e6ce0e08 DJ |
119 | if (!cpumask_test_cpu(*cb_cpu, pd->cpumask.cbcpu)) { |
120 | if (!cpumask_weight(pd->cpumask.cbcpu)) | |
121 | goto out; | |
122 | ||
123 | /* Select an alternate fallback CPU and notify the caller. */ | |
124 | cpu_index = *cb_cpu % cpumask_weight(pd->cpumask.cbcpu); | |
125 | ||
126 | cpu = cpumask_first(pd->cpumask.cbcpu); | |
127 | for (i = 0; i < cpu_index; i++) | |
128 | cpu = cpumask_next(cpu, pd->cpumask.cbcpu); | |
129 | ||
130 | *cb_cpu = cpu; | |
131 | } | |
16295bec SK |
132 | |
133 | err = -EBUSY; | |
134 | if ((pinst->flags & PADATA_RESET)) | |
135 | goto out; | |
136 | ||
137 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
138 | goto out; | |
139 | ||
83f619f3 | 140 | err = 0; |
16295bec SK |
141 | atomic_inc(&pd->refcnt); |
142 | padata->pd = pd; | |
e6ce0e08 | 143 | padata->cb_cpu = *cb_cpu; |
16295bec | 144 | |
bfde23ce DJ |
145 | padata->seq_nr = atomic_inc_return(&pd->seq_nr); |
146 | target_cpu = padata_cpu_hash(pd, padata->seq_nr); | |
350ef88e | 147 | padata->cpu = target_cpu; |
e15bacbe | 148 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
149 | |
150 | spin_lock(&queue->parallel.lock); | |
151 | list_add_tail(&padata->list, &queue->parallel.list); | |
152 | spin_unlock(&queue->parallel.lock); | |
153 | ||
bfde23ce | 154 | queue_work(pinst->parallel_wq, &queue->work); |
16295bec SK |
155 | |
156 | out: | |
157 | rcu_read_unlock_bh(); | |
158 | ||
159 | return err; | |
160 | } | |
161 | EXPORT_SYMBOL(padata_do_parallel); | |
162 | ||
0198ffd1 | 163 | /* |
bfde23ce | 164 | * padata_find_next - Find the next object that needs serialization. |
0198ffd1 SK |
165 | * |
166 | * Return values are: | |
167 | * | |
168 | * A pointer to the control struct of the next object that needs | |
169 | * serialization, if present in one of the percpu reorder queues. | |
170 | * | |
bfde23ce | 171 | * NULL, if the next object that needs serialization will |
0198ffd1 SK |
172 | * be parallel processed by another cpu and is not yet present in |
173 | * the cpu's reorder queue. | |
0198ffd1 | 174 | */ |
bfde23ce DJ |
175 | static struct padata_priv *padata_find_next(struct parallel_data *pd, |
176 | bool remove_object) | |
16295bec | 177 | { |
f0fcf200 | 178 | struct padata_parallel_queue *next_queue; |
16295bec SK |
179 | struct padata_priv *padata; |
180 | struct padata_list *reorder; | |
6fc4dbcf | 181 | int cpu = pd->cpu; |
16295bec | 182 | |
e15bacbe | 183 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec SK |
184 | reorder = &next_queue->reorder; |
185 | ||
de5540d0 | 186 | spin_lock(&reorder->lock); |
bfde23ce DJ |
187 | if (list_empty(&reorder->list)) { |
188 | spin_unlock(&reorder->lock); | |
189 | return NULL; | |
190 | } | |
16295bec | 191 | |
bfde23ce | 192 | padata = list_entry(reorder->list.next, struct padata_priv, list); |
16295bec | 193 | |
bfde23ce DJ |
194 | /* |
195 | * Checks the rare case where two or more parallel jobs have hashed to | |
196 | * the same CPU and one of the later ones finishes first. | |
197 | */ | |
198 | if (padata->seq_nr != pd->processed) { | |
de5540d0 | 199 | spin_unlock(&reorder->lock); |
bfde23ce | 200 | return NULL; |
16295bec SK |
201 | } |
202 | ||
bfde23ce DJ |
203 | if (remove_object) { |
204 | list_del_init(&padata->list); | |
205 | atomic_dec(&pd->reorder_objects); | |
206 | ++pd->processed; | |
207 | pd->cpu = cpumask_next_wrap(cpu, pd->cpumask.pcpu, -1, false); | |
16295bec SK |
208 | } |
209 | ||
bfde23ce | 210 | spin_unlock(&reorder->lock); |
16295bec SK |
211 | return padata; |
212 | } | |
213 | ||
214 | static void padata_reorder(struct parallel_data *pd) | |
215 | { | |
b77a06e6 | 216 | struct padata_instance *pinst = pd->ps->pinst; |
3047817b | 217 | int cb_cpu; |
16295bec | 218 | struct padata_priv *padata; |
e15bacbe | 219 | struct padata_serial_queue *squeue; |
6fc4dbcf | 220 | struct padata_parallel_queue *next_queue; |
16295bec | 221 | |
0198ffd1 SK |
222 | /* |
223 | * We need to ensure that only one cpu can work on dequeueing of | |
224 | * the reorder queue the time. Calculating in which percpu reorder | |
225 | * queue the next object will arrive takes some time. A spinlock | |
226 | * would be highly contended. Also it is not clear in which order | |
227 | * the objects arrive to the reorder queues. So a cpu could wait to | |
228 | * get the lock just to notice that there is nothing to do at the | |
229 | * moment. Therefore we use a trylock and let the holder of the lock | |
230 | * care for all the objects enqueued during the holdtime of the lock. | |
231 | */ | |
16295bec | 232 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 233 | return; |
16295bec SK |
234 | |
235 | while (1) { | |
bfde23ce | 236 | padata = padata_find_next(pd, true); |
16295bec | 237 | |
0198ffd1 | 238 | /* |
69b34844 JD |
239 | * If the next object that needs serialization is parallel |
240 | * processed by another cpu and is still on it's way to the | |
241 | * cpu's reorder queue, nothing to do for now. | |
0198ffd1 | 242 | */ |
bfde23ce | 243 | if (!padata) |
16295bec SK |
244 | break; |
245 | ||
3047817b SK |
246 | cb_cpu = padata->cb_cpu; |
247 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 248 | |
e15bacbe DK |
249 | spin_lock(&squeue->serial.lock); |
250 | list_add_tail(&padata->list, &squeue->serial.list); | |
251 | spin_unlock(&squeue->serial.lock); | |
16295bec | 252 | |
45d153c0 | 253 | queue_work_on(cb_cpu, pinst->serial_wq, &squeue->work); |
16295bec SK |
254 | } |
255 | ||
256 | spin_unlock_bh(&pd->lock); | |
257 | ||
0198ffd1 SK |
258 | /* |
259 | * The next object that needs serialization might have arrived to | |
6fc4dbcf | 260 | * the reorder queues in the meantime. |
cf144f81 | 261 | * |
6fc4dbcf HX |
262 | * Ensure reorder queue is read after pd->lock is dropped so we see |
263 | * new objects from another task in padata_do_serial. Pairs with | |
cf144f81 | 264 | * smp_mb__after_atomic in padata_do_serial. |
0198ffd1 | 265 | */ |
cf144f81 | 266 | smp_mb(); |
16295bec | 267 | |
6fc4dbcf | 268 | next_queue = per_cpu_ptr(pd->pqueue, pd->cpu); |
bfde23ce DJ |
269 | if (!list_empty(&next_queue->reorder.list) && |
270 | padata_find_next(pd, false)) | |
45d153c0 | 271 | queue_work(pinst->serial_wq, &pd->reorder_work); |
16295bec SK |
272 | } |
273 | ||
cf5868c8 MK |
274 | static void invoke_padata_reorder(struct work_struct *work) |
275 | { | |
cf5868c8 MK |
276 | struct parallel_data *pd; |
277 | ||
278 | local_bh_disable(); | |
6fc4dbcf | 279 | pd = container_of(work, struct parallel_data, reorder_work); |
cf5868c8 MK |
280 | padata_reorder(pd); |
281 | local_bh_enable(); | |
282 | } | |
283 | ||
e15bacbe | 284 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 285 | { |
e15bacbe | 286 | struct padata_serial_queue *squeue; |
16295bec SK |
287 | struct parallel_data *pd; |
288 | LIST_HEAD(local_list); | |
b5b4d5d2 | 289 | int cnt; |
16295bec SK |
290 | |
291 | local_bh_disable(); | |
e15bacbe DK |
292 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
293 | pd = squeue->pd; | |
16295bec | 294 | |
e15bacbe DK |
295 | spin_lock(&squeue->serial.lock); |
296 | list_replace_init(&squeue->serial.list, &local_list); | |
297 | spin_unlock(&squeue->serial.lock); | |
16295bec | 298 | |
b5b4d5d2 HX |
299 | cnt = 0; |
300 | ||
16295bec SK |
301 | while (!list_empty(&local_list)) { |
302 | struct padata_priv *padata; | |
303 | ||
304 | padata = list_entry(local_list.next, | |
305 | struct padata_priv, list); | |
306 | ||
307 | list_del_init(&padata->list); | |
308 | ||
309 | padata->serial(padata); | |
b5b4d5d2 | 310 | cnt++; |
16295bec SK |
311 | } |
312 | local_bh_enable(); | |
b5b4d5d2 HX |
313 | |
314 | if (atomic_sub_and_test(cnt, &pd->refcnt)) | |
315 | padata_free_pd(pd); | |
16295bec SK |
316 | } |
317 | ||
0198ffd1 | 318 | /** |
16295bec SK |
319 | * padata_do_serial - padata serialization function |
320 | * | |
321 | * @padata: object to be serialized. | |
322 | * | |
323 | * padata_do_serial must be called for every parallelized object. | |
324 | * The serialization callback function will run with BHs off. | |
325 | */ | |
326 | void padata_do_serial(struct padata_priv *padata) | |
327 | { | |
065cf577 DJ |
328 | struct parallel_data *pd = padata->pd; |
329 | struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue, | |
330 | padata->cpu); | |
bfde23ce | 331 | struct padata_priv *cur; |
16295bec | 332 | |
e15bacbe | 333 | spin_lock(&pqueue->reorder.lock); |
bfde23ce DJ |
334 | /* Sort in ascending order of sequence number. */ |
335 | list_for_each_entry_reverse(cur, &pqueue->reorder.list, list) | |
336 | if (cur->seq_nr < padata->seq_nr) | |
337 | break; | |
338 | list_add(&padata->list, &cur->list); | |
6fc4dbcf | 339 | atomic_inc(&pd->reorder_objects); |
e15bacbe | 340 | spin_unlock(&pqueue->reorder.lock); |
16295bec | 341 | |
cf144f81 | 342 | /* |
6fc4dbcf | 343 | * Ensure the addition to the reorder list is ordered correctly |
cf144f81 DJ |
344 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb |
345 | * in padata_reorder. | |
346 | */ | |
347 | smp_mb__after_atomic(); | |
348 | ||
6fc4dbcf | 349 | padata_reorder(pd); |
16295bec SK |
350 | } |
351 | EXPORT_SYMBOL(padata_do_serial); | |
352 | ||
b77a06e6 | 353 | static int padata_setup_cpumasks(struct padata_instance *pinst) |
16295bec | 354 | { |
bfde23ce | 355 | struct workqueue_attrs *attrs; |
b77a06e6 HX |
356 | int err; |
357 | ||
358 | attrs = alloc_workqueue_attrs(); | |
359 | if (!attrs) | |
360 | return -ENOMEM; | |
361 | ||
362 | /* Restrict parallel_wq workers to pd->cpumask.pcpu. */ | |
363 | cpumask_copy(attrs->cpumask, pinst->cpumask.pcpu); | |
364 | err = apply_workqueue_attrs(pinst->parallel_wq, attrs); | |
365 | free_workqueue_attrs(attrs); | |
366 | ||
367 | return err; | |
368 | } | |
369 | ||
370 | static int pd_setup_cpumasks(struct parallel_data *pd, | |
371 | const struct cpumask *pcpumask, | |
372 | const struct cpumask *cbcpumask) | |
373 | { | |
bfde23ce | 374 | int err = -ENOMEM; |
16295bec | 375 | |
bfde23ce DJ |
376 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
377 | goto out; | |
bfde23ce DJ |
378 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) |
379 | goto free_pcpu_mask; | |
bfde23ce | 380 | |
b77a06e6 HX |
381 | cpumask_copy(pd->cpumask.pcpu, pcpumask); |
382 | cpumask_copy(pd->cpumask.cbcpu, cbcpumask); | |
bfde23ce | 383 | |
e15bacbe | 384 | return 0; |
bfde23ce | 385 | |
bfde23ce DJ |
386 | free_pcpu_mask: |
387 | free_cpumask_var(pd->cpumask.pcpu); | |
388 | out: | |
389 | return err; | |
e15bacbe | 390 | } |
16295bec | 391 | |
e15bacbe DK |
392 | static void __padata_list_init(struct padata_list *pd_list) |
393 | { | |
394 | INIT_LIST_HEAD(&pd_list->list); | |
395 | spin_lock_init(&pd_list->lock); | |
396 | } | |
16295bec | 397 | |
e15bacbe DK |
398 | /* Initialize all percpu queues used by serial workers */ |
399 | static void padata_init_squeues(struct parallel_data *pd) | |
400 | { | |
401 | int cpu; | |
402 | struct padata_serial_queue *squeue; | |
7b389b2c | 403 | |
e15bacbe DK |
404 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
405 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
406 | squeue->pd = pd; | |
407 | __padata_list_init(&squeue->serial); | |
408 | INIT_WORK(&squeue->work, padata_serial_worker); | |
409 | } | |
410 | } | |
16295bec | 411 | |
e15bacbe DK |
412 | /* Initialize all percpu queues used by parallel workers */ |
413 | static void padata_init_pqueues(struct parallel_data *pd) | |
414 | { | |
c51636a3 | 415 | int cpu; |
e15bacbe | 416 | struct padata_parallel_queue *pqueue; |
16295bec | 417 | |
c51636a3 | 418 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
e15bacbe | 419 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
1bd845bc | 420 | |
e15bacbe DK |
421 | __padata_list_init(&pqueue->reorder); |
422 | __padata_list_init(&pqueue->parallel); | |
423 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
424 | atomic_set(&pqueue->num_obj, 0); | |
16295bec | 425 | } |
e15bacbe | 426 | } |
16295bec | 427 | |
e15bacbe | 428 | /* Allocate and initialize the internal cpumask dependend resources. */ |
b77a06e6 | 429 | static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) |
e15bacbe | 430 | { |
b77a06e6 HX |
431 | struct padata_instance *pinst = ps->pinst; |
432 | const struct cpumask *cbcpumask; | |
433 | const struct cpumask *pcpumask; | |
e15bacbe | 434 | struct parallel_data *pd; |
16295bec | 435 | |
b77a06e6 HX |
436 | cbcpumask = pinst->rcpumask.cbcpu; |
437 | pcpumask = pinst->rcpumask.pcpu; | |
438 | ||
e15bacbe DK |
439 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
440 | if (!pd) | |
441 | goto err; | |
16295bec | 442 | |
e15bacbe DK |
443 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
444 | if (!pd->pqueue) | |
445 | goto err_free_pd; | |
446 | ||
447 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
448 | if (!pd->squeue) | |
449 | goto err_free_pqueue; | |
bfde23ce | 450 | |
b77a06e6 HX |
451 | pd->ps = ps; |
452 | if (pd_setup_cpumasks(pd, pcpumask, cbcpumask)) | |
e15bacbe | 453 | goto err_free_squeue; |
16295bec | 454 | |
e15bacbe DK |
455 | padata_init_pqueues(pd); |
456 | padata_init_squeues(pd); | |
0b6b098e | 457 | atomic_set(&pd->seq_nr, -1); |
16295bec | 458 | atomic_set(&pd->reorder_objects, 0); |
b5b4d5d2 | 459 | atomic_set(&pd->refcnt, 1); |
16295bec | 460 | spin_lock_init(&pd->lock); |
ec9c7d19 | 461 | pd->cpu = cpumask_first(pd->cpumask.pcpu); |
6fc4dbcf | 462 | INIT_WORK(&pd->reorder_work, invoke_padata_reorder); |
16295bec SK |
463 | |
464 | return pd; | |
465 | ||
e15bacbe DK |
466 | err_free_squeue: |
467 | free_percpu(pd->squeue); | |
468 | err_free_pqueue: | |
469 | free_percpu(pd->pqueue); | |
16295bec SK |
470 | err_free_pd: |
471 | kfree(pd); | |
472 | err: | |
473 | return NULL; | |
474 | } | |
475 | ||
476 | static void padata_free_pd(struct parallel_data *pd) | |
477 | { | |
e15bacbe DK |
478 | free_cpumask_var(pd->cpumask.pcpu); |
479 | free_cpumask_var(pd->cpumask.cbcpu); | |
480 | free_percpu(pd->pqueue); | |
481 | free_percpu(pd->squeue); | |
16295bec SK |
482 | kfree(pd); |
483 | } | |
484 | ||
4c879170 SK |
485 | static void __padata_start(struct padata_instance *pinst) |
486 | { | |
487 | pinst->flags |= PADATA_INIT; | |
488 | } | |
489 | ||
ee836555 SK |
490 | static void __padata_stop(struct padata_instance *pinst) |
491 | { | |
492 | if (!(pinst->flags & PADATA_INIT)) | |
493 | return; | |
494 | ||
495 | pinst->flags &= ~PADATA_INIT; | |
496 | ||
497 | synchronize_rcu(); | |
ee836555 SK |
498 | } |
499 | ||
25985edc | 500 | /* Replace the internal control structure with a new one. */ |
b77a06e6 | 501 | static int padata_replace_one(struct padata_shell *ps) |
16295bec | 502 | { |
b77a06e6 | 503 | struct parallel_data *pd_new; |
16295bec | 504 | |
b77a06e6 HX |
505 | pd_new = padata_alloc_pd(ps); |
506 | if (!pd_new) | |
507 | return -ENOMEM; | |
16295bec | 508 | |
b77a06e6 HX |
509 | ps->opd = rcu_dereference_protected(ps->pd, 1); |
510 | rcu_assign_pointer(ps->pd, pd_new); | |
16295bec | 511 | |
b77a06e6 HX |
512 | return 0; |
513 | } | |
514 | ||
d03702c3 | 515 | static int padata_replace(struct padata_instance *pinst) |
b77a06e6 HX |
516 | { |
517 | int notification_mask = 0; | |
518 | struct padata_shell *ps; | |
b8b78470 | 519 | int err = 0; |
b77a06e6 HX |
520 | |
521 | pinst->flags |= PADATA_RESET; | |
16295bec | 522 | |
b77a06e6 HX |
523 | cpumask_copy(pinst->omask, pinst->rcpumask.pcpu); |
524 | cpumask_and(pinst->rcpumask.pcpu, pinst->cpumask.pcpu, | |
525 | cpu_online_mask); | |
b77a06e6 | 526 | if (!cpumask_equal(pinst->omask, pinst->rcpumask.pcpu)) |
e15bacbe | 527 | notification_mask |= PADATA_CPU_PARALLEL; |
b77a06e6 HX |
528 | |
529 | cpumask_copy(pinst->omask, pinst->rcpumask.cbcpu); | |
530 | cpumask_and(pinst->rcpumask.cbcpu, pinst->cpumask.cbcpu, | |
531 | cpu_online_mask); | |
b77a06e6 | 532 | if (!cpumask_equal(pinst->omask, pinst->rcpumask.cbcpu)) |
e15bacbe DK |
533 | notification_mask |= PADATA_CPU_SERIAL; |
534 | ||
b77a06e6 HX |
535 | list_for_each_entry(ps, &pinst->pslist, list) { |
536 | err = padata_replace_one(ps); | |
537 | if (err) | |
538 | break; | |
539 | } | |
540 | ||
541 | synchronize_rcu(); | |
542 | ||
543 | list_for_each_entry_continue_reverse(ps, &pinst->pslist, list) | |
544 | if (atomic_dec_and_test(&ps->opd->refcnt)) | |
545 | padata_free_pd(ps->opd); | |
16295bec | 546 | |
e15bacbe DK |
547 | if (notification_mask) |
548 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
c635696c | 549 | notification_mask, |
b77a06e6 | 550 | &pinst->cpumask); |
16295bec SK |
551 | |
552 | pinst->flags &= ~PADATA_RESET; | |
b77a06e6 HX |
553 | |
554 | return err; | |
16295bec SK |
555 | } |
556 | ||
0198ffd1 | 557 | /** |
e15bacbe DK |
558 | * padata_register_cpumask_notifier - Registers a notifier that will be called |
559 | * if either pcpu or cbcpu or both cpumasks change. | |
16295bec | 560 | * |
e15bacbe DK |
561 | * @pinst: A poineter to padata instance |
562 | * @nblock: A pointer to notifier block. | |
16295bec | 563 | */ |
e15bacbe DK |
564 | int padata_register_cpumask_notifier(struct padata_instance *pinst, |
565 | struct notifier_block *nblock) | |
16295bec | 566 | { |
e15bacbe DK |
567 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, |
568 | nblock); | |
569 | } | |
570 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
571 | ||
572 | /** | |
573 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
574 | * registered earlier using padata_register_cpumask_notifier | |
575 | * | |
576 | * @pinst: A pointer to data instance. | |
577 | * @nlock: A pointer to notifier block. | |
578 | */ | |
579 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
580 | struct notifier_block *nblock) | |
581 | { | |
582 | return blocking_notifier_chain_unregister( | |
583 | &pinst->cpumask_change_notifier, | |
584 | nblock); | |
585 | } | |
586 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
587 | ||
588 | ||
33e54450 SK |
589 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
590 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
591 | const struct cpumask *cpumask) | |
592 | { | |
13614e0f | 593 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
594 | pinst->flags |= PADATA_INVALID; |
595 | return false; | |
596 | } | |
597 | ||
598 | pinst->flags &= ~PADATA_INVALID; | |
599 | return true; | |
600 | } | |
601 | ||
65ff577e SK |
602 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
603 | cpumask_var_t pcpumask, | |
604 | cpumask_var_t cbcpumask) | |
605 | { | |
606 | int valid; | |
b77a06e6 | 607 | int err; |
65ff577e SK |
608 | |
609 | valid = padata_validate_cpumask(pinst, pcpumask); | |
610 | if (!valid) { | |
611 | __padata_stop(pinst); | |
612 | goto out_replace; | |
613 | } | |
614 | ||
615 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
616 | if (!valid) | |
617 | __padata_stop(pinst); | |
618 | ||
619 | out_replace: | |
65ff577e SK |
620 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
621 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
622 | ||
d03702c3 | 623 | err = padata_setup_cpumasks(pinst) ?: padata_replace(pinst); |
65ff577e SK |
624 | |
625 | if (valid) | |
626 | __padata_start(pinst); | |
627 | ||
b77a06e6 | 628 | return err; |
65ff577e SK |
629 | } |
630 | ||
e15bacbe DK |
631 | /** |
632 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
633 | * equivalent to @cpumask. | |
16295bec SK |
634 | * |
635 | * @pinst: padata instance | |
e15bacbe DK |
636 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
637 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
638 | * @cpumask: the cpumask to use |
639 | */ | |
e15bacbe DK |
640 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
641 | cpumask_var_t cpumask) | |
642 | { | |
643 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
644 | int err = -EINVAL; |
645 | ||
6751fb3c | 646 | get_online_cpus(); |
1f779a87 | 647 | mutex_lock(&pinst->lock); |
6751fb3c | 648 | |
e15bacbe DK |
649 | switch (cpumask_type) { |
650 | case PADATA_CPU_PARALLEL: | |
651 | serial_mask = pinst->cpumask.cbcpu; | |
652 | parallel_mask = cpumask; | |
653 | break; | |
654 | case PADATA_CPU_SERIAL: | |
655 | parallel_mask = pinst->cpumask.pcpu; | |
656 | serial_mask = cpumask; | |
657 | break; | |
658 | default: | |
65ff577e | 659 | goto out; |
16295bec SK |
660 | } |
661 | ||
65ff577e | 662 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
663 | |
664 | out: | |
665 | mutex_unlock(&pinst->lock); | |
1f779a87 | 666 | put_online_cpus(); |
16295bec SK |
667 | |
668 | return err; | |
669 | } | |
670 | EXPORT_SYMBOL(padata_set_cpumask); | |
671 | ||
19d795b6 AB |
672 | /** |
673 | * padata_start - start the parallel processing | |
674 | * | |
675 | * @pinst: padata instance to start | |
676 | */ | |
677 | int padata_start(struct padata_instance *pinst) | |
678 | { | |
679 | int err = 0; | |
680 | ||
681 | mutex_lock(&pinst->lock); | |
682 | ||
683 | if (pinst->flags & PADATA_INVALID) | |
684 | err = -EINVAL; | |
685 | ||
8ddab428 | 686 | __padata_start(pinst); |
19d795b6 AB |
687 | |
688 | mutex_unlock(&pinst->lock); | |
689 | ||
690 | return err; | |
691 | } | |
692 | EXPORT_SYMBOL(padata_start); | |
693 | ||
694 | /** | |
695 | * padata_stop - stop the parallel processing | |
696 | * | |
697 | * @pinst: padata instance to stop | |
698 | */ | |
699 | void padata_stop(struct padata_instance *pinst) | |
700 | { | |
701 | mutex_lock(&pinst->lock); | |
702 | __padata_stop(pinst); | |
703 | mutex_unlock(&pinst->lock); | |
704 | } | |
705 | EXPORT_SYMBOL(padata_stop); | |
706 | ||
707 | #ifdef CONFIG_HOTPLUG_CPU | |
708 | ||
16295bec SK |
709 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
710 | { | |
b77a06e6 | 711 | int err = 0; |
16295bec | 712 | |
13614e0f | 713 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
d03702c3 | 714 | err = padata_replace(pinst); |
33e54450 | 715 | |
e15bacbe DK |
716 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
717 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 718 | __padata_start(pinst); |
16295bec SK |
719 | } |
720 | ||
b77a06e6 | 721 | return err; |
16295bec SK |
722 | } |
723 | ||
16295bec SK |
724 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
725 | { | |
b77a06e6 | 726 | int err = 0; |
16295bec | 727 | |
d03702c3 | 728 | if (!cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe | 729 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 730 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 731 | __padata_stop(pinst); |
33e54450 | 732 | |
d03702c3 | 733 | err = padata_replace(pinst); |
16295bec SK |
734 | } |
735 | ||
b77a06e6 | 736 | return err; |
16295bec SK |
737 | } |
738 | ||
e15bacbe | 739 | /** |
25985edc | 740 | * padata_remove_cpu - remove a cpu from the one or both(serial and parallel) |
e15bacbe | 741 | * padata cpumasks. |
16295bec SK |
742 | * |
743 | * @pinst: padata instance | |
744 | * @cpu: cpu to remove | |
e15bacbe DK |
745 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
746 | * The @mask may be any combination of the following flags: | |
747 | * PADATA_CPU_SERIAL - serial cpumask | |
748 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 749 | */ |
e15bacbe | 750 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
751 | { |
752 | int err; | |
753 | ||
e15bacbe DK |
754 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
755 | return -EINVAL; | |
756 | ||
16295bec SK |
757 | mutex_lock(&pinst->lock); |
758 | ||
6751fb3c | 759 | get_online_cpus(); |
e15bacbe DK |
760 | if (mask & PADATA_CPU_SERIAL) |
761 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
762 | if (mask & PADATA_CPU_PARALLEL) | |
763 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
764 | ||
16295bec | 765 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 766 | put_online_cpus(); |
16295bec SK |
767 | |
768 | mutex_unlock(&pinst->lock); | |
769 | ||
770 | return err; | |
771 | } | |
772 | EXPORT_SYMBOL(padata_remove_cpu); | |
773 | ||
e15bacbe DK |
774 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
775 | { | |
776 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
777 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
778 | } | |
779 | ||
30e92153 | 780 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 781 | { |
16295bec | 782 | struct padata_instance *pinst; |
30e92153 | 783 | int ret; |
16295bec | 784 | |
1c9a1814 | 785 | pinst = hlist_entry_safe(node, struct padata_instance, cpu_online_node); |
30e92153 SAS |
786 | if (!pinst_has_cpu(pinst, cpu)) |
787 | return 0; | |
16295bec | 788 | |
30e92153 SAS |
789 | mutex_lock(&pinst->lock); |
790 | ret = __padata_add_cpu(pinst, cpu); | |
791 | mutex_unlock(&pinst->lock); | |
792 | return ret; | |
793 | } | |
16295bec | 794 | |
d03702c3 | 795 | static int padata_cpu_dead(unsigned int cpu, struct hlist_node *node) |
30e92153 SAS |
796 | { |
797 | struct padata_instance *pinst; | |
798 | int ret; | |
799 | ||
1c9a1814 | 800 | pinst = hlist_entry_safe(node, struct padata_instance, cpu_dead_node); |
30e92153 SAS |
801 | if (!pinst_has_cpu(pinst, cpu)) |
802 | return 0; | |
16295bec | 803 | |
30e92153 SAS |
804 | mutex_lock(&pinst->lock); |
805 | ret = __padata_remove_cpu(pinst, cpu); | |
806 | mutex_unlock(&pinst->lock); | |
807 | return ret; | |
16295bec | 808 | } |
30e92153 SAS |
809 | |
810 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 811 | #endif |
16295bec | 812 | |
5e017dc3 DK |
813 | static void __padata_free(struct padata_instance *pinst) |
814 | { | |
815 | #ifdef CONFIG_HOTPLUG_CPU | |
1c9a1814 DJ |
816 | cpuhp_state_remove_instance_nocalls(CPUHP_PADATA_DEAD, |
817 | &pinst->cpu_dead_node); | |
818 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->cpu_online_node); | |
5e017dc3 DK |
819 | #endif |
820 | ||
b77a06e6 HX |
821 | WARN_ON(!list_empty(&pinst->pslist)); |
822 | ||
5e017dc3 | 823 | padata_stop(pinst); |
b77a06e6 HX |
824 | free_cpumask_var(pinst->omask); |
825 | free_cpumask_var(pinst->rcpumask.cbcpu); | |
826 | free_cpumask_var(pinst->rcpumask.pcpu); | |
5e017dc3 DK |
827 | free_cpumask_var(pinst->cpumask.pcpu); |
828 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
829 | destroy_workqueue(pinst->serial_wq); |
830 | destroy_workqueue(pinst->parallel_wq); | |
5e017dc3 DK |
831 | kfree(pinst); |
832 | } | |
833 | ||
834 | #define kobj2pinst(_kobj) \ | |
835 | container_of(_kobj, struct padata_instance, kobj) | |
836 | #define attr2pentry(_attr) \ | |
837 | container_of(_attr, struct padata_sysfs_entry, attr) | |
838 | ||
839 | static void padata_sysfs_release(struct kobject *kobj) | |
840 | { | |
841 | struct padata_instance *pinst = kobj2pinst(kobj); | |
842 | __padata_free(pinst); | |
843 | } | |
844 | ||
845 | struct padata_sysfs_entry { | |
846 | struct attribute attr; | |
847 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
848 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
849 | const char *, size_t); | |
850 | }; | |
851 | ||
852 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
853 | struct attribute *attr, char *buf) | |
854 | { | |
855 | struct cpumask *cpumask; | |
856 | ssize_t len; | |
857 | ||
858 | mutex_lock(&pinst->lock); | |
859 | if (!strcmp(attr->name, "serial_cpumask")) | |
860 | cpumask = pinst->cpumask.cbcpu; | |
861 | else | |
862 | cpumask = pinst->cpumask.pcpu; | |
863 | ||
4497da6f TH |
864 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
865 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 866 | mutex_unlock(&pinst->lock); |
4497da6f | 867 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
868 | } |
869 | ||
870 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
871 | struct attribute *attr, | |
872 | const char *buf, size_t count) | |
873 | { | |
874 | cpumask_var_t new_cpumask; | |
875 | ssize_t ret; | |
876 | int mask_type; | |
877 | ||
878 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
879 | return -ENOMEM; | |
880 | ||
881 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
882 | nr_cpumask_bits); | |
883 | if (ret < 0) | |
884 | goto out; | |
885 | ||
886 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
887 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
888 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
889 | if (!ret) | |
890 | ret = count; | |
891 | ||
892 | out: | |
893 | free_cpumask_var(new_cpumask); | |
894 | return ret; | |
895 | } | |
896 | ||
897 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
898 | static struct padata_sysfs_entry _name##_attr = \ | |
899 | __ATTR(_name, 0644, _show_name, _store_name) | |
900 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
901 | static struct padata_sysfs_entry _name##_attr = \ | |
902 | __ATTR(_name, 0400, _show_name, NULL) | |
903 | ||
904 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
905 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
906 | ||
907 | /* | |
908 | * Padata sysfs provides the following objects: | |
909 | * serial_cpumask [RW] - cpumask for serial workers | |
910 | * parallel_cpumask [RW] - cpumask for parallel workers | |
911 | */ | |
912 | static struct attribute *padata_default_attrs[] = { | |
913 | &serial_cpumask_attr.attr, | |
914 | ¶llel_cpumask_attr.attr, | |
915 | NULL, | |
916 | }; | |
2064fbc7 | 917 | ATTRIBUTE_GROUPS(padata_default); |
5e017dc3 DK |
918 | |
919 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
920 | struct attribute *attr, char *buf) | |
921 | { | |
922 | struct padata_instance *pinst; | |
923 | struct padata_sysfs_entry *pentry; | |
924 | ssize_t ret = -EIO; | |
925 | ||
926 | pinst = kobj2pinst(kobj); | |
927 | pentry = attr2pentry(attr); | |
928 | if (pentry->show) | |
929 | ret = pentry->show(pinst, attr, buf); | |
930 | ||
931 | return ret; | |
932 | } | |
933 | ||
934 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
935 | const char *buf, size_t count) | |
936 | { | |
937 | struct padata_instance *pinst; | |
938 | struct padata_sysfs_entry *pentry; | |
939 | ssize_t ret = -EIO; | |
940 | ||
941 | pinst = kobj2pinst(kobj); | |
942 | pentry = attr2pentry(attr); | |
943 | if (pentry->show) | |
944 | ret = pentry->store(pinst, attr, buf, count); | |
945 | ||
946 | return ret; | |
947 | } | |
948 | ||
949 | static const struct sysfs_ops padata_sysfs_ops = { | |
950 | .show = padata_sysfs_show, | |
951 | .store = padata_sysfs_store, | |
952 | }; | |
953 | ||
954 | static struct kobj_type padata_attr_type = { | |
955 | .sysfs_ops = &padata_sysfs_ops, | |
2064fbc7 | 956 | .default_groups = padata_default_groups, |
5e017dc3 DK |
957 | .release = padata_sysfs_release, |
958 | }; | |
959 | ||
e15bacbe | 960 | /** |
e6cc1170 SK |
961 | * padata_alloc - allocate and initialize a padata instance and specify |
962 | * cpumasks for serial and parallel workers. | |
16295bec | 963 | * |
b128a304 | 964 | * @name: used to identify the instance |
e15bacbe DK |
965 | * @pcpumask: cpumask that will be used for padata parallelization |
966 | * @cbcpumask: cpumask that will be used for padata serialization | |
16295bec | 967 | */ |
b128a304 | 968 | static struct padata_instance *padata_alloc(const char *name, |
9596695e TG |
969 | const struct cpumask *pcpumask, |
970 | const struct cpumask *cbcpumask) | |
16295bec | 971 | { |
16295bec | 972 | struct padata_instance *pinst; |
16295bec SK |
973 | |
974 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
975 | if (!pinst) | |
976 | goto err; | |
977 | ||
bfde23ce DJ |
978 | pinst->parallel_wq = alloc_workqueue("%s_parallel", WQ_UNBOUND, 0, |
979 | name); | |
45d153c0 | 980 | if (!pinst->parallel_wq) |
16295bec | 981 | goto err_free_inst; |
b128a304 | 982 | |
cc491d8e DJ |
983 | get_online_cpus(); |
984 | ||
45d153c0 DJ |
985 | pinst->serial_wq = alloc_workqueue("%s_serial", WQ_MEM_RECLAIM | |
986 | WQ_CPU_INTENSIVE, 1, name); | |
987 | if (!pinst->serial_wq) | |
cc491d8e | 988 | goto err_put_cpus; |
45d153c0 DJ |
989 | |
990 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) | |
991 | goto err_free_serial_wq; | |
e15bacbe DK |
992 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
993 | free_cpumask_var(pinst->cpumask.pcpu); | |
45d153c0 | 994 | goto err_free_serial_wq; |
33e54450 | 995 | } |
e15bacbe DK |
996 | if (!padata_validate_cpumask(pinst, pcpumask) || |
997 | !padata_validate_cpumask(pinst, cbcpumask)) | |
998 | goto err_free_masks; | |
16295bec | 999 | |
b77a06e6 | 1000 | if (!alloc_cpumask_var(&pinst->rcpumask.pcpu, GFP_KERNEL)) |
e15bacbe | 1001 | goto err_free_masks; |
b77a06e6 HX |
1002 | if (!alloc_cpumask_var(&pinst->rcpumask.cbcpu, GFP_KERNEL)) |
1003 | goto err_free_rcpumask_pcpu; | |
1004 | if (!alloc_cpumask_var(&pinst->omask, GFP_KERNEL)) | |
1005 | goto err_free_rcpumask_cbcpu; | |
74781387 | 1006 | |
b77a06e6 | 1007 | INIT_LIST_HEAD(&pinst->pslist); |
16295bec | 1008 | |
e15bacbe DK |
1009 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
1010 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
b77a06e6 HX |
1011 | cpumask_and(pinst->rcpumask.pcpu, pcpumask, cpu_online_mask); |
1012 | cpumask_and(pinst->rcpumask.cbcpu, cbcpumask, cpu_online_mask); | |
1013 | ||
1014 | if (padata_setup_cpumasks(pinst)) | |
1015 | goto err_free_omask; | |
16295bec SK |
1016 | |
1017 | pinst->flags = 0; | |
1018 | ||
e15bacbe | 1019 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 1020 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1021 | mutex_init(&pinst->lock); |
1022 | ||
b8b4a416 | 1023 | #ifdef CONFIG_HOTPLUG_CPU |
1c9a1814 DJ |
1024 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, |
1025 | &pinst->cpu_online_node); | |
d03702c3 | 1026 | cpuhp_state_add_instance_nocalls_cpuslocked(CPUHP_PADATA_DEAD, |
1c9a1814 | 1027 | &pinst->cpu_dead_node); |
b8b4a416 | 1028 | #endif |
cc491d8e DJ |
1029 | |
1030 | put_online_cpus(); | |
1031 | ||
16295bec SK |
1032 | return pinst; |
1033 | ||
b77a06e6 HX |
1034 | err_free_omask: |
1035 | free_cpumask_var(pinst->omask); | |
1036 | err_free_rcpumask_cbcpu: | |
1037 | free_cpumask_var(pinst->rcpumask.cbcpu); | |
1038 | err_free_rcpumask_pcpu: | |
1039 | free_cpumask_var(pinst->rcpumask.pcpu); | |
e15bacbe DK |
1040 | err_free_masks: |
1041 | free_cpumask_var(pinst->cpumask.pcpu); | |
1042 | free_cpumask_var(pinst->cpumask.cbcpu); | |
45d153c0 DJ |
1043 | err_free_serial_wq: |
1044 | destroy_workqueue(pinst->serial_wq); | |
cc491d8e DJ |
1045 | err_put_cpus: |
1046 | put_online_cpus(); | |
45d153c0 | 1047 | destroy_workqueue(pinst->parallel_wq); |
16295bec SK |
1048 | err_free_inst: |
1049 | kfree(pinst); | |
1050 | err: | |
1051 | return NULL; | |
1052 | } | |
16295bec | 1053 | |
9596695e TG |
1054 | /** |
1055 | * padata_alloc_possible - Allocate and initialize padata instance. | |
1056 | * Use the cpu_possible_mask for serial and | |
1057 | * parallel workers. | |
1058 | * | |
b128a304 | 1059 | * @name: used to identify the instance |
9596695e | 1060 | */ |
b128a304 | 1061 | struct padata_instance *padata_alloc_possible(const char *name) |
9596695e | 1062 | { |
b128a304 | 1063 | return padata_alloc(name, cpu_possible_mask, cpu_possible_mask); |
9596695e TG |
1064 | } |
1065 | EXPORT_SYMBOL(padata_alloc_possible); | |
1066 | ||
0198ffd1 | 1067 | /** |
16295bec SK |
1068 | * padata_free - free a padata instance |
1069 | * | |
0198ffd1 | 1070 | * @padata_inst: padata instance to free |
16295bec SK |
1071 | */ |
1072 | void padata_free(struct padata_instance *pinst) | |
1073 | { | |
5e017dc3 | 1074 | kobject_put(&pinst->kobj); |
16295bec SK |
1075 | } |
1076 | EXPORT_SYMBOL(padata_free); | |
30e92153 | 1077 | |
b77a06e6 HX |
1078 | /** |
1079 | * padata_alloc_shell - Allocate and initialize padata shell. | |
1080 | * | |
1081 | * @pinst: Parent padata_instance object. | |
1082 | */ | |
1083 | struct padata_shell *padata_alloc_shell(struct padata_instance *pinst) | |
1084 | { | |
1085 | struct parallel_data *pd; | |
1086 | struct padata_shell *ps; | |
1087 | ||
1088 | ps = kzalloc(sizeof(*ps), GFP_KERNEL); | |
1089 | if (!ps) | |
1090 | goto out; | |
1091 | ||
1092 | ps->pinst = pinst; | |
1093 | ||
1094 | get_online_cpus(); | |
1095 | pd = padata_alloc_pd(ps); | |
1096 | put_online_cpus(); | |
1097 | ||
1098 | if (!pd) | |
1099 | goto out_free_ps; | |
1100 | ||
1101 | mutex_lock(&pinst->lock); | |
1102 | RCU_INIT_POINTER(ps->pd, pd); | |
1103 | list_add(&ps->list, &pinst->pslist); | |
1104 | mutex_unlock(&pinst->lock); | |
1105 | ||
1106 | return ps; | |
1107 | ||
1108 | out_free_ps: | |
1109 | kfree(ps); | |
1110 | out: | |
1111 | return NULL; | |
1112 | } | |
1113 | EXPORT_SYMBOL(padata_alloc_shell); | |
1114 | ||
1115 | /** | |
1116 | * padata_free_shell - free a padata shell | |
1117 | * | |
1118 | * @ps: padata shell to free | |
1119 | */ | |
1120 | void padata_free_shell(struct padata_shell *ps) | |
1121 | { | |
1122 | struct padata_instance *pinst = ps->pinst; | |
1123 | ||
1124 | mutex_lock(&pinst->lock); | |
1125 | list_del(&ps->list); | |
1126 | padata_free_pd(rcu_dereference_protected(ps->pd, 1)); | |
1127 | mutex_unlock(&pinst->lock); | |
1128 | ||
1129 | kfree(ps); | |
1130 | } | |
1131 | EXPORT_SYMBOL(padata_free_shell); | |
1132 | ||
30e92153 SAS |
1133 | #ifdef CONFIG_HOTPLUG_CPU |
1134 | ||
1135 | static __init int padata_driver_init(void) | |
1136 | { | |
1137 | int ret; | |
1138 | ||
1139 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", | |
d03702c3 | 1140 | padata_cpu_online, NULL); |
30e92153 SAS |
1141 | if (ret < 0) |
1142 | return ret; | |
1143 | hp_online = ret; | |
d03702c3 DJ |
1144 | |
1145 | ret = cpuhp_setup_state_multi(CPUHP_PADATA_DEAD, "padata:dead", | |
1146 | NULL, padata_cpu_dead); | |
1147 | if (ret < 0) { | |
1148 | cpuhp_remove_multi_state(hp_online); | |
1149 | return ret; | |
1150 | } | |
30e92153 SAS |
1151 | return 0; |
1152 | } | |
1153 | module_init(padata_driver_init); | |
1154 | ||
1155 | static __exit void padata_driver_exit(void) | |
1156 | { | |
d03702c3 | 1157 | cpuhp_remove_multi_state(CPUHP_PADATA_DEAD); |
30e92153 SAS |
1158 | cpuhp_remove_multi_state(hp_online); |
1159 | } | |
1160 | module_exit(padata_driver_exit); | |
1161 | #endif |