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16295bec SK |
1 | /* |
2 | * padata.c - generic interface to process data streams in parallel | |
3 | * | |
107f8bda SK |
4 | * See Documentation/padata.txt for an api documentation. |
5 | * | |
16295bec SK |
6 | * Copyright (C) 2008, 2009 secunet Security Networks AG |
7 | * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms and conditions of the GNU General Public License, | |
11 | * version 2, as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along with | |
19 | * this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | ||
9984de1a | 23 | #include <linux/export.h> |
16295bec SK |
24 | #include <linux/cpumask.h> |
25 | #include <linux/err.h> | |
26 | #include <linux/cpu.h> | |
27 | #include <linux/padata.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/sched.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
5e017dc3 | 31 | #include <linux/sysfs.h> |
16295bec | 32 | #include <linux/rcupdate.h> |
30e92153 | 33 | #include <linux/module.h> |
16295bec | 34 | |
97e3d94a | 35 | #define MAX_OBJ_NUM 1000 |
16295bec SK |
36 | |
37 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) | |
38 | { | |
39 | int cpu, target_cpu; | |
40 | ||
e15bacbe | 41 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
16295bec | 42 | for (cpu = 0; cpu < cpu_index; cpu++) |
e15bacbe | 43 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
16295bec SK |
44 | |
45 | return target_cpu; | |
46 | } | |
47 | ||
2dc9b5db | 48 | static int padata_cpu_hash(struct parallel_data *pd) |
16295bec | 49 | { |
0b6b098e | 50 | unsigned int seq_nr; |
16295bec | 51 | int cpu_index; |
16295bec SK |
52 | |
53 | /* | |
54 | * Hash the sequence numbers to the cpus by taking | |
55 | * seq_nr mod. number of cpus in use. | |
56 | */ | |
2dc9b5db | 57 | |
0b6b098e MK |
58 | seq_nr = atomic_inc_return(&pd->seq_nr); |
59 | cpu_index = seq_nr % cpumask_weight(pd->cpumask.pcpu); | |
16295bec SK |
60 | |
61 | return padata_index_to_cpu(pd, cpu_index); | |
62 | } | |
63 | ||
e15bacbe | 64 | static void padata_parallel_worker(struct work_struct *parallel_work) |
16295bec | 65 | { |
e15bacbe | 66 | struct padata_parallel_queue *pqueue; |
16295bec SK |
67 | LIST_HEAD(local_list); |
68 | ||
69 | local_bh_disable(); | |
e15bacbe DK |
70 | pqueue = container_of(parallel_work, |
71 | struct padata_parallel_queue, work); | |
16295bec | 72 | |
e15bacbe DK |
73 | spin_lock(&pqueue->parallel.lock); |
74 | list_replace_init(&pqueue->parallel.list, &local_list); | |
75 | spin_unlock(&pqueue->parallel.lock); | |
16295bec SK |
76 | |
77 | while (!list_empty(&local_list)) { | |
78 | struct padata_priv *padata; | |
79 | ||
80 | padata = list_entry(local_list.next, | |
81 | struct padata_priv, list); | |
82 | ||
83 | list_del_init(&padata->list); | |
84 | ||
85 | padata->parallel(padata); | |
86 | } | |
87 | ||
88 | local_bh_enable(); | |
89 | } | |
90 | ||
0198ffd1 | 91 | /** |
16295bec SK |
92 | * padata_do_parallel - padata parallelization function |
93 | * | |
94 | * @pinst: padata instance | |
95 | * @padata: object to be parallelized | |
96 | * @cb_cpu: cpu the serialization callback function will run on, | |
e15bacbe | 97 | * must be in the serial cpumask of padata(i.e. cpumask.cbcpu). |
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 | */ | |
103 | int padata_do_parallel(struct padata_instance *pinst, | |
104 | struct padata_priv *padata, int cb_cpu) | |
105 | { | |
106 | int target_cpu, err; | |
e15bacbe | 107 | struct padata_parallel_queue *queue; |
16295bec SK |
108 | struct parallel_data *pd; |
109 | ||
110 | rcu_read_lock_bh(); | |
111 | ||
c0e656b7 | 112 | pd = rcu_dereference_bh(pinst->pd); |
16295bec | 113 | |
83f619f3 | 114 | err = -EINVAL; |
7424713b | 115 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
16295bec SK |
116 | goto out; |
117 | ||
e15bacbe | 118 | if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu)) |
16295bec SK |
119 | goto out; |
120 | ||
121 | err = -EBUSY; | |
122 | if ((pinst->flags & PADATA_RESET)) | |
123 | goto out; | |
124 | ||
125 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) | |
126 | goto out; | |
127 | ||
83f619f3 | 128 | err = 0; |
16295bec SK |
129 | atomic_inc(&pd->refcnt); |
130 | padata->pd = pd; | |
131 | padata->cb_cpu = cb_cpu; | |
132 | ||
2dc9b5db | 133 | target_cpu = padata_cpu_hash(pd); |
350ef88e | 134 | padata->cpu = target_cpu; |
e15bacbe | 135 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
16295bec SK |
136 | |
137 | spin_lock(&queue->parallel.lock); | |
138 | list_add_tail(&padata->list, &queue->parallel.list); | |
139 | spin_unlock(&queue->parallel.lock); | |
140 | ||
e15bacbe | 141 | queue_work_on(target_cpu, pinst->wq, &queue->work); |
16295bec SK |
142 | |
143 | out: | |
144 | rcu_read_unlock_bh(); | |
145 | ||
146 | return err; | |
147 | } | |
148 | EXPORT_SYMBOL(padata_do_parallel); | |
149 | ||
0198ffd1 SK |
150 | /* |
151 | * padata_get_next - Get the next object that needs serialization. | |
152 | * | |
153 | * Return values are: | |
154 | * | |
155 | * A pointer to the control struct of the next object that needs | |
156 | * serialization, if present in one of the percpu reorder queues. | |
157 | * | |
0198ffd1 SK |
158 | * -EINPROGRESS, if the next object that needs serialization will |
159 | * be parallel processed by another cpu and is not yet present in | |
160 | * the cpu's reorder queue. | |
161 | * | |
162 | * -ENODATA, if this cpu has to do the parallel processing for | |
163 | * the next object. | |
164 | */ | |
16295bec SK |
165 | static struct padata_priv *padata_get_next(struct parallel_data *pd) |
166 | { | |
5f1a8c1b | 167 | int cpu, num_cpus; |
2dc9b5db | 168 | unsigned int next_nr, next_index; |
f0fcf200 | 169 | struct padata_parallel_queue *next_queue; |
16295bec SK |
170 | struct padata_priv *padata; |
171 | struct padata_list *reorder; | |
172 | ||
e15bacbe | 173 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
16295bec | 174 | |
5f1a8c1b SK |
175 | /* |
176 | * Calculate the percpu reorder queue and the sequence | |
177 | * number of the next object. | |
178 | */ | |
179 | next_nr = pd->processed; | |
180 | next_index = next_nr % num_cpus; | |
181 | cpu = padata_index_to_cpu(pd, next_index); | |
e15bacbe | 182 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
5f1a8c1b | 183 | |
16295bec SK |
184 | reorder = &next_queue->reorder; |
185 | ||
de5540d0 | 186 | spin_lock(&reorder->lock); |
16295bec SK |
187 | if (!list_empty(&reorder->list)) { |
188 | padata = list_entry(reorder->list.next, | |
189 | struct padata_priv, list); | |
190 | ||
16295bec SK |
191 | list_del_init(&padata->list); |
192 | atomic_dec(&pd->reorder_objects); | |
16295bec | 193 | |
5f1a8c1b | 194 | pd->processed++; |
16295bec | 195 | |
de5540d0 | 196 | spin_unlock(&reorder->lock); |
16295bec SK |
197 | goto out; |
198 | } | |
de5540d0 | 199 | spin_unlock(&reorder->lock); |
16295bec | 200 | |
f0fcf200 | 201 | if (__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index) { |
16295bec SK |
202 | padata = ERR_PTR(-ENODATA); |
203 | goto out; | |
204 | } | |
205 | ||
206 | padata = ERR_PTR(-EINPROGRESS); | |
207 | out: | |
208 | return padata; | |
209 | } | |
210 | ||
211 | static void padata_reorder(struct parallel_data *pd) | |
212 | { | |
3047817b | 213 | int cb_cpu; |
16295bec | 214 | struct padata_priv *padata; |
e15bacbe | 215 | struct padata_serial_queue *squeue; |
16295bec SK |
216 | struct padata_instance *pinst = pd->pinst; |
217 | ||
0198ffd1 SK |
218 | /* |
219 | * We need to ensure that only one cpu can work on dequeueing of | |
220 | * the reorder queue the time. Calculating in which percpu reorder | |
221 | * queue the next object will arrive takes some time. A spinlock | |
222 | * would be highly contended. Also it is not clear in which order | |
223 | * the objects arrive to the reorder queues. So a cpu could wait to | |
224 | * get the lock just to notice that there is nothing to do at the | |
225 | * moment. Therefore we use a trylock and let the holder of the lock | |
226 | * care for all the objects enqueued during the holdtime of the lock. | |
227 | */ | |
16295bec | 228 | if (!spin_trylock_bh(&pd->lock)) |
d46a5ac7 | 229 | return; |
16295bec SK |
230 | |
231 | while (1) { | |
232 | padata = padata_get_next(pd); | |
233 | ||
0198ffd1 | 234 | /* |
69b34844 JD |
235 | * If the next object that needs serialization is parallel |
236 | * processed by another cpu and is still on it's way to the | |
237 | * cpu's reorder queue, nothing to do for now. | |
0198ffd1 | 238 | */ |
69b34844 | 239 | if (PTR_ERR(padata) == -EINPROGRESS) |
16295bec SK |
240 | break; |
241 | ||
0198ffd1 SK |
242 | /* |
243 | * This cpu has to do the parallel processing of the next | |
244 | * object. It's waiting in the cpu's parallelization queue, | |
25985edc | 245 | * so exit immediately. |
0198ffd1 | 246 | */ |
16295bec | 247 | if (PTR_ERR(padata) == -ENODATA) { |
d46a5ac7 | 248 | del_timer(&pd->timer); |
16295bec | 249 | spin_unlock_bh(&pd->lock); |
d46a5ac7 | 250 | return; |
16295bec SK |
251 | } |
252 | ||
3047817b SK |
253 | cb_cpu = padata->cb_cpu; |
254 | squeue = per_cpu_ptr(pd->squeue, cb_cpu); | |
16295bec | 255 | |
e15bacbe DK |
256 | spin_lock(&squeue->serial.lock); |
257 | list_add_tail(&padata->list, &squeue->serial.list); | |
258 | spin_unlock(&squeue->serial.lock); | |
16295bec | 259 | |
3047817b | 260 | queue_work_on(cb_cpu, pinst->wq, &squeue->work); |
16295bec SK |
261 | } |
262 | ||
263 | spin_unlock_bh(&pd->lock); | |
264 | ||
0198ffd1 SK |
265 | /* |
266 | * The next object that needs serialization might have arrived to | |
267 | * the reorder queues in the meantime, we will be called again | |
25985edc | 268 | * from the timer function if no one else cares for it. |
ba32db5b DJ |
269 | * |
270 | * Ensure reorder_objects is read after pd->lock is dropped so we see | |
271 | * an increment from another task in padata_do_serial. Pairs with | |
272 | * smp_mb__after_atomic in padata_do_serial. | |
0198ffd1 | 273 | */ |
ba32db5b | 274 | smp_mb(); |
d46a5ac7 SK |
275 | if (atomic_read(&pd->reorder_objects) |
276 | && !(pinst->flags & PADATA_RESET)) | |
277 | mod_timer(&pd->timer, jiffies + HZ); | |
278 | else | |
279 | del_timer(&pd->timer); | |
16295bec | 280 | |
16295bec SK |
281 | return; |
282 | } | |
283 | ||
cf5868c8 MK |
284 | static void invoke_padata_reorder(struct work_struct *work) |
285 | { | |
286 | struct padata_parallel_queue *pqueue; | |
287 | struct parallel_data *pd; | |
288 | ||
289 | local_bh_disable(); | |
290 | pqueue = container_of(work, struct padata_parallel_queue, reorder_work); | |
291 | pd = pqueue->pd; | |
292 | padata_reorder(pd); | |
293 | local_bh_enable(); | |
294 | } | |
295 | ||
e99e88a9 | 296 | static void padata_reorder_timer(struct timer_list *t) |
d46a5ac7 | 297 | { |
e99e88a9 | 298 | struct parallel_data *pd = from_timer(pd, t, timer); |
cf5868c8 MK |
299 | unsigned int weight; |
300 | int target_cpu, cpu; | |
d46a5ac7 | 301 | |
cf5868c8 MK |
302 | cpu = get_cpu(); |
303 | ||
304 | /* We don't lock pd here to not interfere with parallel processing | |
305 | * padata_reorder() calls on other CPUs. We just need any CPU out of | |
306 | * the cpumask.pcpu set. It would be nice if it's the right one but | |
307 | * it doesn't matter if we're off to the next one by using an outdated | |
308 | * pd->processed value. | |
309 | */ | |
310 | weight = cpumask_weight(pd->cpumask.pcpu); | |
311 | target_cpu = padata_index_to_cpu(pd, pd->processed % weight); | |
312 | ||
313 | /* ensure to call the reorder callback on the correct CPU */ | |
314 | if (cpu != target_cpu) { | |
315 | struct padata_parallel_queue *pqueue; | |
316 | struct padata_instance *pinst; | |
317 | ||
318 | /* The timer function is serialized wrt itself -- no locking | |
319 | * needed. | |
320 | */ | |
321 | pinst = pd->pinst; | |
322 | pqueue = per_cpu_ptr(pd->pqueue, target_cpu); | |
323 | queue_work_on(target_cpu, pinst->wq, &pqueue->reorder_work); | |
324 | } else { | |
325 | padata_reorder(pd); | |
326 | } | |
327 | ||
328 | put_cpu(); | |
d46a5ac7 SK |
329 | } |
330 | ||
e15bacbe | 331 | static void padata_serial_worker(struct work_struct *serial_work) |
16295bec | 332 | { |
e15bacbe | 333 | struct padata_serial_queue *squeue; |
16295bec SK |
334 | struct parallel_data *pd; |
335 | LIST_HEAD(local_list); | |
336 | ||
337 | local_bh_disable(); | |
e15bacbe DK |
338 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
339 | pd = squeue->pd; | |
16295bec | 340 | |
e15bacbe DK |
341 | spin_lock(&squeue->serial.lock); |
342 | list_replace_init(&squeue->serial.list, &local_list); | |
343 | spin_unlock(&squeue->serial.lock); | |
16295bec SK |
344 | |
345 | while (!list_empty(&local_list)) { | |
346 | struct padata_priv *padata; | |
347 | ||
348 | padata = list_entry(local_list.next, | |
349 | struct padata_priv, list); | |
350 | ||
351 | list_del_init(&padata->list); | |
352 | ||
353 | padata->serial(padata); | |
354 | atomic_dec(&pd->refcnt); | |
355 | } | |
356 | local_bh_enable(); | |
357 | } | |
358 | ||
0198ffd1 | 359 | /** |
16295bec SK |
360 | * padata_do_serial - padata serialization function |
361 | * | |
362 | * @padata: object to be serialized. | |
363 | * | |
364 | * padata_do_serial must be called for every parallelized object. | |
365 | * The serialization callback function will run with BHs off. | |
366 | */ | |
367 | void padata_do_serial(struct padata_priv *padata) | |
368 | { | |
369 | int cpu; | |
e15bacbe | 370 | struct padata_parallel_queue *pqueue; |
16295bec | 371 | struct parallel_data *pd; |
350ef88e | 372 | int reorder_via_wq = 0; |
16295bec SK |
373 | |
374 | pd = padata->pd; | |
375 | ||
376 | cpu = get_cpu(); | |
350ef88e MK |
377 | |
378 | /* We need to run on the same CPU padata_do_parallel(.., padata, ..) | |
379 | * was called on -- or, at least, enqueue the padata object into the | |
380 | * correct per-cpu queue. | |
381 | */ | |
382 | if (cpu != padata->cpu) { | |
383 | reorder_via_wq = 1; | |
384 | cpu = padata->cpu; | |
385 | } | |
386 | ||
e15bacbe | 387 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
16295bec | 388 | |
e15bacbe | 389 | spin_lock(&pqueue->reorder.lock); |
16295bec | 390 | atomic_inc(&pd->reorder_objects); |
e15bacbe DK |
391 | list_add_tail(&padata->list, &pqueue->reorder.list); |
392 | spin_unlock(&pqueue->reorder.lock); | |
16295bec | 393 | |
ba32db5b DJ |
394 | /* |
395 | * Ensure the atomic_inc of reorder_objects above is ordered correctly | |
396 | * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb | |
397 | * in padata_reorder. | |
398 | */ | |
399 | smp_mb__after_atomic(); | |
400 | ||
16295bec SK |
401 | put_cpu(); |
402 | ||
350ef88e MK |
403 | /* If we're running on the wrong CPU, call padata_reorder() via a |
404 | * kernel worker. | |
405 | */ | |
406 | if (reorder_via_wq) | |
407 | queue_work_on(cpu, pd->pinst->wq, &pqueue->reorder_work); | |
408 | else | |
409 | padata_reorder(pd); | |
16295bec SK |
410 | } |
411 | EXPORT_SYMBOL(padata_do_serial); | |
412 | ||
e15bacbe DK |
413 | static int padata_setup_cpumasks(struct parallel_data *pd, |
414 | const struct cpumask *pcpumask, | |
415 | const struct cpumask *cbcpumask) | |
16295bec | 416 | { |
e15bacbe DK |
417 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
418 | return -ENOMEM; | |
16295bec | 419 | |
13614e0f | 420 | cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_online_mask); |
e15bacbe | 421 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) { |
07a77929 | 422 | free_cpumask_var(pd->cpumask.pcpu); |
e15bacbe DK |
423 | return -ENOMEM; |
424 | } | |
16295bec | 425 | |
13614e0f | 426 | cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_online_mask); |
e15bacbe DK |
427 | return 0; |
428 | } | |
16295bec | 429 | |
e15bacbe DK |
430 | static void __padata_list_init(struct padata_list *pd_list) |
431 | { | |
432 | INIT_LIST_HEAD(&pd_list->list); | |
433 | spin_lock_init(&pd_list->lock); | |
434 | } | |
16295bec | 435 | |
e15bacbe DK |
436 | /* Initialize all percpu queues used by serial workers */ |
437 | static void padata_init_squeues(struct parallel_data *pd) | |
438 | { | |
439 | int cpu; | |
440 | struct padata_serial_queue *squeue; | |
7b389b2c | 441 | |
e15bacbe DK |
442 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
443 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
444 | squeue->pd = pd; | |
445 | __padata_list_init(&squeue->serial); | |
446 | INIT_WORK(&squeue->work, padata_serial_worker); | |
447 | } | |
448 | } | |
16295bec | 449 | |
e15bacbe DK |
450 | /* Initialize all percpu queues used by parallel workers */ |
451 | static void padata_init_pqueues(struct parallel_data *pd) | |
452 | { | |
2dc9b5db | 453 | int cpu_index, cpu; |
e15bacbe | 454 | struct padata_parallel_queue *pqueue; |
16295bec | 455 | |
e15bacbe | 456 | cpu_index = 0; |
1bd845bc | 457 | for_each_possible_cpu(cpu) { |
e15bacbe | 458 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
1bd845bc MK |
459 | |
460 | if (!cpumask_test_cpu(cpu, pd->cpumask.pcpu)) { | |
461 | pqueue->cpu_index = -1; | |
462 | continue; | |
463 | } | |
464 | ||
e15bacbe DK |
465 | pqueue->pd = pd; |
466 | pqueue->cpu_index = cpu_index; | |
7b389b2c | 467 | cpu_index++; |
16295bec | 468 | |
e15bacbe DK |
469 | __padata_list_init(&pqueue->reorder); |
470 | __padata_list_init(&pqueue->parallel); | |
471 | INIT_WORK(&pqueue->work, padata_parallel_worker); | |
cf5868c8 | 472 | INIT_WORK(&pqueue->reorder_work, invoke_padata_reorder); |
e15bacbe | 473 | atomic_set(&pqueue->num_obj, 0); |
16295bec | 474 | } |
e15bacbe | 475 | } |
16295bec | 476 | |
e15bacbe DK |
477 | /* Allocate and initialize the internal cpumask dependend resources. */ |
478 | static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, | |
479 | const struct cpumask *pcpumask, | |
480 | const struct cpumask *cbcpumask) | |
481 | { | |
482 | struct parallel_data *pd; | |
16295bec | 483 | |
e15bacbe DK |
484 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
485 | if (!pd) | |
486 | goto err; | |
16295bec | 487 | |
e15bacbe DK |
488 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
489 | if (!pd->pqueue) | |
490 | goto err_free_pd; | |
491 | ||
492 | pd->squeue = alloc_percpu(struct padata_serial_queue); | |
493 | if (!pd->squeue) | |
494 | goto err_free_pqueue; | |
495 | if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0) | |
496 | goto err_free_squeue; | |
16295bec | 497 | |
e15bacbe DK |
498 | padata_init_pqueues(pd); |
499 | padata_init_squeues(pd); | |
e99e88a9 | 500 | timer_setup(&pd->timer, padata_reorder_timer, 0); |
0b6b098e | 501 | atomic_set(&pd->seq_nr, -1); |
16295bec SK |
502 | atomic_set(&pd->reorder_objects, 0); |
503 | atomic_set(&pd->refcnt, 0); | |
504 | pd->pinst = pinst; | |
505 | spin_lock_init(&pd->lock); | |
506 | ||
507 | return pd; | |
508 | ||
e15bacbe DK |
509 | err_free_squeue: |
510 | free_percpu(pd->squeue); | |
511 | err_free_pqueue: | |
512 | free_percpu(pd->pqueue); | |
16295bec SK |
513 | err_free_pd: |
514 | kfree(pd); | |
515 | err: | |
516 | return NULL; | |
517 | } | |
518 | ||
519 | static void padata_free_pd(struct parallel_data *pd) | |
520 | { | |
e15bacbe DK |
521 | free_cpumask_var(pd->cpumask.pcpu); |
522 | free_cpumask_var(pd->cpumask.cbcpu); | |
523 | free_percpu(pd->pqueue); | |
524 | free_percpu(pd->squeue); | |
16295bec SK |
525 | kfree(pd); |
526 | } | |
527 | ||
0198ffd1 | 528 | /* Flush all objects out of the padata queues. */ |
2b73b07a SK |
529 | static void padata_flush_queues(struct parallel_data *pd) |
530 | { | |
531 | int cpu; | |
e15bacbe DK |
532 | struct padata_parallel_queue *pqueue; |
533 | struct padata_serial_queue *squeue; | |
2b73b07a | 534 | |
e15bacbe DK |
535 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
536 | pqueue = per_cpu_ptr(pd->pqueue, cpu); | |
537 | flush_work(&pqueue->work); | |
2b73b07a SK |
538 | } |
539 | ||
540 | del_timer_sync(&pd->timer); | |
541 | ||
542 | if (atomic_read(&pd->reorder_objects)) | |
543 | padata_reorder(pd); | |
544 | ||
e15bacbe DK |
545 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
546 | squeue = per_cpu_ptr(pd->squeue, cpu); | |
547 | flush_work(&squeue->work); | |
2b73b07a SK |
548 | } |
549 | ||
550 | BUG_ON(atomic_read(&pd->refcnt) != 0); | |
551 | } | |
552 | ||
4c879170 SK |
553 | static void __padata_start(struct padata_instance *pinst) |
554 | { | |
555 | pinst->flags |= PADATA_INIT; | |
556 | } | |
557 | ||
ee836555 SK |
558 | static void __padata_stop(struct padata_instance *pinst) |
559 | { | |
560 | if (!(pinst->flags & PADATA_INIT)) | |
561 | return; | |
562 | ||
563 | pinst->flags &= ~PADATA_INIT; | |
564 | ||
565 | synchronize_rcu(); | |
566 | ||
567 | get_online_cpus(); | |
568 | padata_flush_queues(pinst->pd); | |
569 | put_online_cpus(); | |
570 | } | |
571 | ||
25985edc | 572 | /* Replace the internal control structure with a new one. */ |
16295bec SK |
573 | static void padata_replace(struct padata_instance *pinst, |
574 | struct parallel_data *pd_new) | |
575 | { | |
576 | struct parallel_data *pd_old = pinst->pd; | |
e15bacbe | 577 | int notification_mask = 0; |
16295bec SK |
578 | |
579 | pinst->flags |= PADATA_RESET; | |
580 | ||
581 | rcu_assign_pointer(pinst->pd, pd_new); | |
582 | ||
583 | synchronize_rcu(); | |
584 | ||
e15bacbe DK |
585 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) |
586 | notification_mask |= PADATA_CPU_PARALLEL; | |
587 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) | |
588 | notification_mask |= PADATA_CPU_SERIAL; | |
589 | ||
2b73b07a | 590 | padata_flush_queues(pd_old); |
16295bec SK |
591 | padata_free_pd(pd_old); |
592 | ||
e15bacbe DK |
593 | if (notification_mask) |
594 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, | |
c635696c SK |
595 | notification_mask, |
596 | &pd_new->cpumask); | |
16295bec SK |
597 | |
598 | pinst->flags &= ~PADATA_RESET; | |
599 | } | |
600 | ||
0198ffd1 | 601 | /** |
e15bacbe DK |
602 | * padata_register_cpumask_notifier - Registers a notifier that will be called |
603 | * if either pcpu or cbcpu or both cpumasks change. | |
16295bec | 604 | * |
e15bacbe DK |
605 | * @pinst: A poineter to padata instance |
606 | * @nblock: A pointer to notifier block. | |
16295bec | 607 | */ |
e15bacbe DK |
608 | int padata_register_cpumask_notifier(struct padata_instance *pinst, |
609 | struct notifier_block *nblock) | |
16295bec | 610 | { |
e15bacbe DK |
611 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, |
612 | nblock); | |
613 | } | |
614 | EXPORT_SYMBOL(padata_register_cpumask_notifier); | |
615 | ||
616 | /** | |
617 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier | |
618 | * registered earlier using padata_register_cpumask_notifier | |
619 | * | |
620 | * @pinst: A pointer to data instance. | |
621 | * @nlock: A pointer to notifier block. | |
622 | */ | |
623 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, | |
624 | struct notifier_block *nblock) | |
625 | { | |
626 | return blocking_notifier_chain_unregister( | |
627 | &pinst->cpumask_change_notifier, | |
628 | nblock); | |
629 | } | |
630 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); | |
631 | ||
632 | ||
33e54450 SK |
633 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
634 | static bool padata_validate_cpumask(struct padata_instance *pinst, | |
635 | const struct cpumask *cpumask) | |
636 | { | |
13614e0f | 637 | if (!cpumask_intersects(cpumask, cpu_online_mask)) { |
33e54450 SK |
638 | pinst->flags |= PADATA_INVALID; |
639 | return false; | |
640 | } | |
641 | ||
642 | pinst->flags &= ~PADATA_INVALID; | |
643 | return true; | |
644 | } | |
645 | ||
65ff577e SK |
646 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
647 | cpumask_var_t pcpumask, | |
648 | cpumask_var_t cbcpumask) | |
649 | { | |
650 | int valid; | |
16295bec | 651 | struct parallel_data *pd; |
65ff577e SK |
652 | |
653 | valid = padata_validate_cpumask(pinst, pcpumask); | |
654 | if (!valid) { | |
655 | __padata_stop(pinst); | |
656 | goto out_replace; | |
657 | } | |
658 | ||
659 | valid = padata_validate_cpumask(pinst, cbcpumask); | |
660 | if (!valid) | |
661 | __padata_stop(pinst); | |
662 | ||
663 | out_replace: | |
664 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); | |
665 | if (!pd) | |
666 | return -ENOMEM; | |
667 | ||
668 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); | |
669 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
670 | ||
671 | padata_replace(pinst, pd); | |
672 | ||
673 | if (valid) | |
674 | __padata_start(pinst); | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
e15bacbe DK |
679 | /** |
680 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value | |
681 | * equivalent to @cpumask. | |
16295bec SK |
682 | * |
683 | * @pinst: padata instance | |
e15bacbe DK |
684 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
685 | * to parallel and serial cpumasks respectively. | |
16295bec SK |
686 | * @cpumask: the cpumask to use |
687 | */ | |
e15bacbe DK |
688 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
689 | cpumask_var_t cpumask) | |
690 | { | |
691 | struct cpumask *serial_mask, *parallel_mask; | |
65ff577e SK |
692 | int err = -EINVAL; |
693 | ||
694 | mutex_lock(&pinst->lock); | |
6751fb3c SK |
695 | get_online_cpus(); |
696 | ||
e15bacbe DK |
697 | switch (cpumask_type) { |
698 | case PADATA_CPU_PARALLEL: | |
699 | serial_mask = pinst->cpumask.cbcpu; | |
700 | parallel_mask = cpumask; | |
701 | break; | |
702 | case PADATA_CPU_SERIAL: | |
703 | parallel_mask = pinst->cpumask.pcpu; | |
704 | serial_mask = cpumask; | |
705 | break; | |
706 | default: | |
65ff577e | 707 | goto out; |
16295bec SK |
708 | } |
709 | ||
65ff577e | 710 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
16295bec SK |
711 | |
712 | out: | |
6751fb3c | 713 | put_online_cpus(); |
16295bec SK |
714 | mutex_unlock(&pinst->lock); |
715 | ||
716 | return err; | |
717 | } | |
718 | EXPORT_SYMBOL(padata_set_cpumask); | |
719 | ||
19d795b6 AB |
720 | /** |
721 | * padata_start - start the parallel processing | |
722 | * | |
723 | * @pinst: padata instance to start | |
724 | */ | |
725 | int padata_start(struct padata_instance *pinst) | |
726 | { | |
727 | int err = 0; | |
728 | ||
729 | mutex_lock(&pinst->lock); | |
730 | ||
731 | if (pinst->flags & PADATA_INVALID) | |
732 | err = -EINVAL; | |
733 | ||
734 | __padata_start(pinst); | |
735 | ||
736 | mutex_unlock(&pinst->lock); | |
737 | ||
738 | return err; | |
739 | } | |
740 | EXPORT_SYMBOL(padata_start); | |
741 | ||
742 | /** | |
743 | * padata_stop - stop the parallel processing | |
744 | * | |
745 | * @pinst: padata instance to stop | |
746 | */ | |
747 | void padata_stop(struct padata_instance *pinst) | |
748 | { | |
749 | mutex_lock(&pinst->lock); | |
750 | __padata_stop(pinst); | |
751 | mutex_unlock(&pinst->lock); | |
752 | } | |
753 | EXPORT_SYMBOL(padata_stop); | |
754 | ||
755 | #ifdef CONFIG_HOTPLUG_CPU | |
756 | ||
16295bec SK |
757 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
758 | { | |
759 | struct parallel_data *pd; | |
760 | ||
13614e0f | 761 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
e15bacbe DK |
762 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
763 | pinst->cpumask.cbcpu); | |
16295bec SK |
764 | if (!pd) |
765 | return -ENOMEM; | |
766 | ||
767 | padata_replace(pinst, pd); | |
33e54450 | 768 | |
e15bacbe DK |
769 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
770 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) | |
33e54450 | 771 | __padata_start(pinst); |
16295bec SK |
772 | } |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
16295bec SK |
777 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
778 | { | |
33e54450 | 779 | struct parallel_data *pd = NULL; |
16295bec SK |
780 | |
781 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { | |
33e54450 | 782 | |
e15bacbe | 783 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
b89661df | 784 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
33e54450 | 785 | __padata_stop(pinst); |
33e54450 | 786 | |
e15bacbe DK |
787 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
788 | pinst->cpumask.cbcpu); | |
16295bec SK |
789 | if (!pd) |
790 | return -ENOMEM; | |
791 | ||
792 | padata_replace(pinst, pd); | |
96120905 SK |
793 | |
794 | cpumask_clear_cpu(cpu, pd->cpumask.cbcpu); | |
795 | cpumask_clear_cpu(cpu, pd->cpumask.pcpu); | |
16295bec SK |
796 | } |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
e15bacbe | 801 | /** |
25985edc | 802 | * padata_remove_cpu - remove a cpu from the one or both(serial and parallel) |
e15bacbe | 803 | * padata cpumasks. |
16295bec SK |
804 | * |
805 | * @pinst: padata instance | |
806 | * @cpu: cpu to remove | |
e15bacbe DK |
807 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
808 | * The @mask may be any combination of the following flags: | |
809 | * PADATA_CPU_SERIAL - serial cpumask | |
810 | * PADATA_CPU_PARALLEL - parallel cpumask | |
16295bec | 811 | */ |
e15bacbe | 812 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
16295bec SK |
813 | { |
814 | int err; | |
815 | ||
e15bacbe DK |
816 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
817 | return -EINVAL; | |
818 | ||
16295bec SK |
819 | mutex_lock(&pinst->lock); |
820 | ||
6751fb3c | 821 | get_online_cpus(); |
e15bacbe DK |
822 | if (mask & PADATA_CPU_SERIAL) |
823 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); | |
824 | if (mask & PADATA_CPU_PARALLEL) | |
825 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); | |
826 | ||
16295bec | 827 | err = __padata_remove_cpu(pinst, cpu); |
6751fb3c | 828 | put_online_cpus(); |
16295bec SK |
829 | |
830 | mutex_unlock(&pinst->lock); | |
831 | ||
832 | return err; | |
833 | } | |
834 | EXPORT_SYMBOL(padata_remove_cpu); | |
835 | ||
e15bacbe DK |
836 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
837 | { | |
838 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || | |
839 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); | |
840 | } | |
841 | ||
30e92153 | 842 | static int padata_cpu_online(unsigned int cpu, struct hlist_node *node) |
16295bec | 843 | { |
16295bec | 844 | struct padata_instance *pinst; |
30e92153 | 845 | int ret; |
16295bec | 846 | |
30e92153 SAS |
847 | pinst = hlist_entry_safe(node, struct padata_instance, node); |
848 | if (!pinst_has_cpu(pinst, cpu)) | |
849 | return 0; | |
16295bec | 850 | |
30e92153 SAS |
851 | mutex_lock(&pinst->lock); |
852 | ret = __padata_add_cpu(pinst, cpu); | |
853 | mutex_unlock(&pinst->lock); | |
854 | return ret; | |
855 | } | |
16295bec | 856 | |
30e92153 SAS |
857 | static int padata_cpu_prep_down(unsigned int cpu, struct hlist_node *node) |
858 | { | |
859 | struct padata_instance *pinst; | |
860 | int ret; | |
861 | ||
862 | pinst = hlist_entry_safe(node, struct padata_instance, node); | |
863 | if (!pinst_has_cpu(pinst, cpu)) | |
864 | return 0; | |
16295bec | 865 | |
30e92153 SAS |
866 | mutex_lock(&pinst->lock); |
867 | ret = __padata_remove_cpu(pinst, cpu); | |
868 | mutex_unlock(&pinst->lock); | |
869 | return ret; | |
16295bec | 870 | } |
30e92153 SAS |
871 | |
872 | static enum cpuhp_state hp_online; | |
e2cb2f1c | 873 | #endif |
16295bec | 874 | |
5e017dc3 DK |
875 | static void __padata_free(struct padata_instance *pinst) |
876 | { | |
877 | #ifdef CONFIG_HOTPLUG_CPU | |
30e92153 | 878 | cpuhp_state_remove_instance_nocalls(hp_online, &pinst->node); |
5e017dc3 DK |
879 | #endif |
880 | ||
881 | padata_stop(pinst); | |
882 | padata_free_pd(pinst->pd); | |
883 | free_cpumask_var(pinst->cpumask.pcpu); | |
884 | free_cpumask_var(pinst->cpumask.cbcpu); | |
885 | kfree(pinst); | |
886 | } | |
887 | ||
888 | #define kobj2pinst(_kobj) \ | |
889 | container_of(_kobj, struct padata_instance, kobj) | |
890 | #define attr2pentry(_attr) \ | |
891 | container_of(_attr, struct padata_sysfs_entry, attr) | |
892 | ||
893 | static void padata_sysfs_release(struct kobject *kobj) | |
894 | { | |
895 | struct padata_instance *pinst = kobj2pinst(kobj); | |
896 | __padata_free(pinst); | |
897 | } | |
898 | ||
899 | struct padata_sysfs_entry { | |
900 | struct attribute attr; | |
901 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); | |
902 | ssize_t (*store)(struct padata_instance *, struct attribute *, | |
903 | const char *, size_t); | |
904 | }; | |
905 | ||
906 | static ssize_t show_cpumask(struct padata_instance *pinst, | |
907 | struct attribute *attr, char *buf) | |
908 | { | |
909 | struct cpumask *cpumask; | |
910 | ssize_t len; | |
911 | ||
912 | mutex_lock(&pinst->lock); | |
913 | if (!strcmp(attr->name, "serial_cpumask")) | |
914 | cpumask = pinst->cpumask.cbcpu; | |
915 | else | |
916 | cpumask = pinst->cpumask.pcpu; | |
917 | ||
4497da6f TH |
918 | len = snprintf(buf, PAGE_SIZE, "%*pb\n", |
919 | nr_cpu_ids, cpumask_bits(cpumask)); | |
5e017dc3 | 920 | mutex_unlock(&pinst->lock); |
4497da6f | 921 | return len < PAGE_SIZE ? len : -EINVAL; |
5e017dc3 DK |
922 | } |
923 | ||
924 | static ssize_t store_cpumask(struct padata_instance *pinst, | |
925 | struct attribute *attr, | |
926 | const char *buf, size_t count) | |
927 | { | |
928 | cpumask_var_t new_cpumask; | |
929 | ssize_t ret; | |
930 | int mask_type; | |
931 | ||
932 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) | |
933 | return -ENOMEM; | |
934 | ||
935 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), | |
936 | nr_cpumask_bits); | |
937 | if (ret < 0) | |
938 | goto out; | |
939 | ||
940 | mask_type = !strcmp(attr->name, "serial_cpumask") ? | |
941 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; | |
942 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); | |
943 | if (!ret) | |
944 | ret = count; | |
945 | ||
946 | out: | |
947 | free_cpumask_var(new_cpumask); | |
948 | return ret; | |
949 | } | |
950 | ||
951 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ | |
952 | static struct padata_sysfs_entry _name##_attr = \ | |
953 | __ATTR(_name, 0644, _show_name, _store_name) | |
954 | #define PADATA_ATTR_RO(_name, _show_name) \ | |
955 | static struct padata_sysfs_entry _name##_attr = \ | |
956 | __ATTR(_name, 0400, _show_name, NULL) | |
957 | ||
958 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); | |
959 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); | |
960 | ||
961 | /* | |
962 | * Padata sysfs provides the following objects: | |
963 | * serial_cpumask [RW] - cpumask for serial workers | |
964 | * parallel_cpumask [RW] - cpumask for parallel workers | |
965 | */ | |
966 | static struct attribute *padata_default_attrs[] = { | |
967 | &serial_cpumask_attr.attr, | |
968 | ¶llel_cpumask_attr.attr, | |
969 | NULL, | |
970 | }; | |
971 | ||
972 | static ssize_t padata_sysfs_show(struct kobject *kobj, | |
973 | struct attribute *attr, char *buf) | |
974 | { | |
975 | struct padata_instance *pinst; | |
976 | struct padata_sysfs_entry *pentry; | |
977 | ssize_t ret = -EIO; | |
978 | ||
979 | pinst = kobj2pinst(kobj); | |
980 | pentry = attr2pentry(attr); | |
981 | if (pentry->show) | |
982 | ret = pentry->show(pinst, attr, buf); | |
983 | ||
984 | return ret; | |
985 | } | |
986 | ||
987 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, | |
988 | const char *buf, size_t count) | |
989 | { | |
990 | struct padata_instance *pinst; | |
991 | struct padata_sysfs_entry *pentry; | |
992 | ssize_t ret = -EIO; | |
993 | ||
994 | pinst = kobj2pinst(kobj); | |
995 | pentry = attr2pentry(attr); | |
996 | if (pentry->show) | |
997 | ret = pentry->store(pinst, attr, buf, count); | |
998 | ||
999 | return ret; | |
1000 | } | |
1001 | ||
1002 | static const struct sysfs_ops padata_sysfs_ops = { | |
1003 | .show = padata_sysfs_show, | |
1004 | .store = padata_sysfs_store, | |
1005 | }; | |
1006 | ||
1007 | static struct kobj_type padata_attr_type = { | |
1008 | .sysfs_ops = &padata_sysfs_ops, | |
1009 | .default_attrs = padata_default_attrs, | |
1010 | .release = padata_sysfs_release, | |
1011 | }; | |
1012 | ||
e15bacbe | 1013 | /** |
e6cc1170 SK |
1014 | * padata_alloc - allocate and initialize a padata instance and specify |
1015 | * cpumasks for serial and parallel workers. | |
16295bec | 1016 | * |
16295bec | 1017 | * @wq: workqueue to use for the allocated padata instance |
e15bacbe DK |
1018 | * @pcpumask: cpumask that will be used for padata parallelization |
1019 | * @cbcpumask: cpumask that will be used for padata serialization | |
c5a81c8f SAS |
1020 | * |
1021 | * Must be called from a cpus_read_lock() protected region | |
16295bec | 1022 | */ |
9596695e TG |
1023 | static struct padata_instance *padata_alloc(struct workqueue_struct *wq, |
1024 | const struct cpumask *pcpumask, | |
1025 | const struct cpumask *cbcpumask) | |
16295bec | 1026 | { |
16295bec | 1027 | struct padata_instance *pinst; |
33e54450 | 1028 | struct parallel_data *pd = NULL; |
16295bec SK |
1029 | |
1030 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); | |
1031 | if (!pinst) | |
1032 | goto err; | |
1033 | ||
e15bacbe | 1034 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) |
16295bec | 1035 | goto err_free_inst; |
e15bacbe DK |
1036 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
1037 | free_cpumask_var(pinst->cpumask.pcpu); | |
16295bec | 1038 | goto err_free_inst; |
33e54450 | 1039 | } |
e15bacbe DK |
1040 | if (!padata_validate_cpumask(pinst, pcpumask) || |
1041 | !padata_validate_cpumask(pinst, cbcpumask)) | |
1042 | goto err_free_masks; | |
16295bec | 1043 | |
e15bacbe DK |
1044 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
1045 | if (!pd) | |
1046 | goto err_free_masks; | |
74781387 | 1047 | |
16295bec SK |
1048 | rcu_assign_pointer(pinst->pd, pd); |
1049 | ||
1050 | pinst->wq = wq; | |
1051 | ||
e15bacbe DK |
1052 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
1053 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); | |
16295bec SK |
1054 | |
1055 | pinst->flags = 0; | |
1056 | ||
e15bacbe | 1057 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
5e017dc3 | 1058 | kobject_init(&pinst->kobj, &padata_attr_type); |
16295bec SK |
1059 | mutex_init(&pinst->lock); |
1060 | ||
b8b4a416 | 1061 | #ifdef CONFIG_HOTPLUG_CPU |
c5a81c8f | 1062 | cpuhp_state_add_instance_nocalls_cpuslocked(hp_online, &pinst->node); |
b8b4a416 | 1063 | #endif |
16295bec SK |
1064 | return pinst; |
1065 | ||
e15bacbe DK |
1066 | err_free_masks: |
1067 | free_cpumask_var(pinst->cpumask.pcpu); | |
1068 | free_cpumask_var(pinst->cpumask.cbcpu); | |
16295bec SK |
1069 | err_free_inst: |
1070 | kfree(pinst); | |
1071 | err: | |
1072 | return NULL; | |
1073 | } | |
16295bec | 1074 | |
9596695e TG |
1075 | /** |
1076 | * padata_alloc_possible - Allocate and initialize padata instance. | |
1077 | * Use the cpu_possible_mask for serial and | |
1078 | * parallel workers. | |
1079 | * | |
1080 | * @wq: workqueue to use for the allocated padata instance | |
c5a81c8f SAS |
1081 | * |
1082 | * Must be called from a cpus_read_lock() protected region | |
9596695e TG |
1083 | */ |
1084 | struct padata_instance *padata_alloc_possible(struct workqueue_struct *wq) | |
1085 | { | |
c5a81c8f | 1086 | lockdep_assert_cpus_held(); |
9596695e TG |
1087 | return padata_alloc(wq, cpu_possible_mask, cpu_possible_mask); |
1088 | } | |
1089 | EXPORT_SYMBOL(padata_alloc_possible); | |
1090 | ||
0198ffd1 | 1091 | /** |
16295bec SK |
1092 | * padata_free - free a padata instance |
1093 | * | |
0198ffd1 | 1094 | * @padata_inst: padata instance to free |
16295bec SK |
1095 | */ |
1096 | void padata_free(struct padata_instance *pinst) | |
1097 | { | |
5e017dc3 | 1098 | kobject_put(&pinst->kobj); |
16295bec SK |
1099 | } |
1100 | EXPORT_SYMBOL(padata_free); | |
30e92153 SAS |
1101 | |
1102 | #ifdef CONFIG_HOTPLUG_CPU | |
1103 | ||
1104 | static __init int padata_driver_init(void) | |
1105 | { | |
1106 | int ret; | |
1107 | ||
1108 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "padata:online", | |
1109 | padata_cpu_online, | |
1110 | padata_cpu_prep_down); | |
1111 | if (ret < 0) | |
1112 | return ret; | |
1113 | hp_online = ret; | |
1114 | return 0; | |
1115 | } | |
1116 | module_init(padata_driver_init); | |
1117 | ||
1118 | static __exit void padata_driver_exit(void) | |
1119 | { | |
1120 | cpuhp_remove_multi_state(hp_online); | |
1121 | } | |
1122 | module_exit(padata_driver_exit); | |
1123 | #endif |