Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1 | /* |
| 2 | * padata.c - generic interface to process data streams in parallel |
| 3 | * |
| 4 | * Copyright (C) 2008, 2009 secunet Security Networks AG |
| 5 | * Copyright (C) 2008, 2009 Steffen Klassert <steffen.klassert@secunet.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms and conditions of the GNU General Public License, |
| 9 | * version 2, as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 14 | * more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along with |
| 17 | * this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/cpumask.h> |
| 23 | #include <linux/err.h> |
| 24 | #include <linux/cpu.h> |
| 25 | #include <linux/padata.h> |
| 26 | #include <linux/mutex.h> |
| 27 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Dan Kruchinin | 5e017dc | 2010-07-14 14:33:08 +0400 | [diff] [blame] | 29 | #include <linux/sysfs.h> |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 30 | #include <linux/rcupdate.h> |
| 31 | |
Dan Carpenter | 749d811 | 2010-06-03 20:19:28 +1000 | [diff] [blame] | 32 | #define MAX_SEQ_NR (INT_MAX - NR_CPUS) |
Steffen Klassert | 97e3d94 | 2010-04-29 14:37:32 +0200 | [diff] [blame] | 33 | #define MAX_OBJ_NUM 1000 |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 34 | |
| 35 | static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) |
| 36 | { |
| 37 | int cpu, target_cpu; |
| 38 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 39 | target_cpu = cpumask_first(pd->cpumask.pcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 40 | for (cpu = 0; cpu < cpu_index; cpu++) |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 41 | target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 42 | |
| 43 | return target_cpu; |
| 44 | } |
| 45 | |
| 46 | static int padata_cpu_hash(struct padata_priv *padata) |
| 47 | { |
| 48 | int cpu_index; |
| 49 | struct parallel_data *pd; |
| 50 | |
| 51 | pd = padata->pd; |
| 52 | |
| 53 | /* |
| 54 | * Hash the sequence numbers to the cpus by taking |
| 55 | * seq_nr mod. number of cpus in use. |
| 56 | */ |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 57 | cpu_index = padata->seq_nr % cpumask_weight(pd->cpumask.pcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 58 | |
| 59 | return padata_index_to_cpu(pd, cpu_index); |
| 60 | } |
| 61 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 62 | static void padata_parallel_worker(struct work_struct *parallel_work) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 63 | { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 64 | struct padata_parallel_queue *pqueue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 65 | struct parallel_data *pd; |
| 66 | struct padata_instance *pinst; |
| 67 | LIST_HEAD(local_list); |
| 68 | |
| 69 | local_bh_disable(); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 70 | pqueue = container_of(parallel_work, |
| 71 | struct padata_parallel_queue, work); |
| 72 | pd = pqueue->pd; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 73 | pinst = pd->pinst; |
| 74 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 75 | spin_lock(&pqueue->parallel.lock); |
| 76 | list_replace_init(&pqueue->parallel.list, &local_list); |
| 77 | spin_unlock(&pqueue->parallel.lock); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 78 | |
| 79 | while (!list_empty(&local_list)) { |
| 80 | struct padata_priv *padata; |
| 81 | |
| 82 | padata = list_entry(local_list.next, |
| 83 | struct padata_priv, list); |
| 84 | |
| 85 | list_del_init(&padata->list); |
| 86 | |
| 87 | padata->parallel(padata); |
| 88 | } |
| 89 | |
| 90 | local_bh_enable(); |
| 91 | } |
| 92 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 93 | /** |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 94 | * padata_do_parallel - padata parallelization function |
| 95 | * |
| 96 | * @pinst: padata instance |
| 97 | * @padata: object to be parallelized |
| 98 | * @cb_cpu: cpu the serialization callback function will run on, |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 99 | * must be in the serial cpumask of padata(i.e. cpumask.cbcpu). |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 100 | * |
| 101 | * The parallelization callback function will run with BHs off. |
| 102 | * Note: Every object which is parallelized by padata_do_parallel |
| 103 | * must be seen by padata_do_serial. |
| 104 | */ |
| 105 | int padata_do_parallel(struct padata_instance *pinst, |
| 106 | struct padata_priv *padata, int cb_cpu) |
| 107 | { |
| 108 | int target_cpu, err; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 109 | struct padata_parallel_queue *queue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 110 | struct parallel_data *pd; |
| 111 | |
| 112 | rcu_read_lock_bh(); |
| 113 | |
| 114 | pd = rcu_dereference(pinst->pd); |
| 115 | |
Steffen Klassert | 83f619f | 2010-07-07 15:32:02 +0200 | [diff] [blame] | 116 | err = -EINVAL; |
Steffen Klassert | 7424713 | 2010-07-20 08:51:25 +0200 | [diff] [blame] | 117 | if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 118 | goto out; |
| 119 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 120 | if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu)) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 121 | goto out; |
| 122 | |
| 123 | err = -EBUSY; |
| 124 | if ((pinst->flags & PADATA_RESET)) |
| 125 | goto out; |
| 126 | |
| 127 | if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM) |
| 128 | goto out; |
| 129 | |
Steffen Klassert | 83f619f | 2010-07-07 15:32:02 +0200 | [diff] [blame] | 130 | err = 0; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 131 | atomic_inc(&pd->refcnt); |
| 132 | padata->pd = pd; |
| 133 | padata->cb_cpu = cb_cpu; |
| 134 | |
| 135 | if (unlikely(atomic_read(&pd->seq_nr) == pd->max_seq_nr)) |
| 136 | atomic_set(&pd->seq_nr, -1); |
| 137 | |
| 138 | padata->seq_nr = atomic_inc_return(&pd->seq_nr); |
| 139 | |
| 140 | target_cpu = padata_cpu_hash(padata); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 141 | queue = per_cpu_ptr(pd->pqueue, target_cpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 142 | |
| 143 | spin_lock(&queue->parallel.lock); |
| 144 | list_add_tail(&padata->list, &queue->parallel.list); |
| 145 | spin_unlock(&queue->parallel.lock); |
| 146 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 147 | queue_work_on(target_cpu, pinst->wq, &queue->work); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 148 | |
| 149 | out: |
| 150 | rcu_read_unlock_bh(); |
| 151 | |
| 152 | return err; |
| 153 | } |
| 154 | EXPORT_SYMBOL(padata_do_parallel); |
| 155 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 156 | /* |
| 157 | * padata_get_next - Get the next object that needs serialization. |
| 158 | * |
| 159 | * Return values are: |
| 160 | * |
| 161 | * A pointer to the control struct of the next object that needs |
| 162 | * serialization, if present in one of the percpu reorder queues. |
| 163 | * |
| 164 | * NULL, if all percpu reorder queues are empty. |
| 165 | * |
| 166 | * -EINPROGRESS, if the next object that needs serialization will |
| 167 | * be parallel processed by another cpu and is not yet present in |
| 168 | * the cpu's reorder queue. |
| 169 | * |
| 170 | * -ENODATA, if this cpu has to do the parallel processing for |
| 171 | * the next object. |
| 172 | */ |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 173 | static struct padata_priv *padata_get_next(struct parallel_data *pd) |
| 174 | { |
Steffen Klassert | 5f1a8c1 | 2010-07-07 15:32:39 +0200 | [diff] [blame] | 175 | int cpu, num_cpus; |
| 176 | int next_nr, next_index; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 177 | struct padata_parallel_queue *queue, *next_queue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 178 | struct padata_priv *padata; |
| 179 | struct padata_list *reorder; |
| 180 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 181 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 182 | |
Steffen Klassert | 5f1a8c1 | 2010-07-07 15:32:39 +0200 | [diff] [blame] | 183 | /* |
| 184 | * Calculate the percpu reorder queue and the sequence |
| 185 | * number of the next object. |
| 186 | */ |
| 187 | next_nr = pd->processed; |
| 188 | next_index = next_nr % num_cpus; |
| 189 | cpu = padata_index_to_cpu(pd, next_index); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 190 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 191 | |
Steffen Klassert | 5f1a8c1 | 2010-07-07 15:32:39 +0200 | [diff] [blame] | 192 | if (unlikely(next_nr > pd->max_seq_nr)) { |
| 193 | next_nr = next_nr - pd->max_seq_nr - 1; |
| 194 | next_index = next_nr % num_cpus; |
| 195 | cpu = padata_index_to_cpu(pd, next_index); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 196 | next_queue = per_cpu_ptr(pd->pqueue, cpu); |
Steffen Klassert | 5f1a8c1 | 2010-07-07 15:32:39 +0200 | [diff] [blame] | 197 | pd->processed = 0; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | padata = NULL; |
| 201 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 202 | reorder = &next_queue->reorder; |
| 203 | |
| 204 | if (!list_empty(&reorder->list)) { |
| 205 | padata = list_entry(reorder->list.next, |
| 206 | struct padata_priv, list); |
| 207 | |
Steffen Klassert | 5f1a8c1 | 2010-07-07 15:32:39 +0200 | [diff] [blame] | 208 | BUG_ON(next_nr != padata->seq_nr); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 209 | |
| 210 | spin_lock(&reorder->lock); |
| 211 | list_del_init(&padata->list); |
| 212 | atomic_dec(&pd->reorder_objects); |
| 213 | spin_unlock(&reorder->lock); |
| 214 | |
Steffen Klassert | 5f1a8c1 | 2010-07-07 15:32:39 +0200 | [diff] [blame] | 215 | pd->processed++; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 216 | |
| 217 | goto out; |
| 218 | } |
| 219 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 220 | queue = per_cpu_ptr(pd->pqueue, smp_processor_id()); |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 221 | if (queue->cpu_index == next_queue->cpu_index) { |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 222 | padata = ERR_PTR(-ENODATA); |
| 223 | goto out; |
| 224 | } |
| 225 | |
| 226 | padata = ERR_PTR(-EINPROGRESS); |
| 227 | out: |
| 228 | return padata; |
| 229 | } |
| 230 | |
| 231 | static void padata_reorder(struct parallel_data *pd) |
| 232 | { |
| 233 | struct padata_priv *padata; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 234 | struct padata_serial_queue *squeue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 235 | struct padata_instance *pinst = pd->pinst; |
| 236 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 237 | /* |
| 238 | * We need to ensure that only one cpu can work on dequeueing of |
| 239 | * the reorder queue the time. Calculating in which percpu reorder |
| 240 | * queue the next object will arrive takes some time. A spinlock |
| 241 | * would be highly contended. Also it is not clear in which order |
| 242 | * the objects arrive to the reorder queues. So a cpu could wait to |
| 243 | * get the lock just to notice that there is nothing to do at the |
| 244 | * moment. Therefore we use a trylock and let the holder of the lock |
| 245 | * care for all the objects enqueued during the holdtime of the lock. |
| 246 | */ |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 247 | if (!spin_trylock_bh(&pd->lock)) |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 248 | return; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 249 | |
| 250 | while (1) { |
| 251 | padata = padata_get_next(pd); |
| 252 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 253 | /* |
| 254 | * All reorder queues are empty, or the next object that needs |
| 255 | * serialization is parallel processed by another cpu and is |
| 256 | * still on it's way to the cpu's reorder queue, nothing to |
| 257 | * do for now. |
| 258 | */ |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 259 | if (!padata || PTR_ERR(padata) == -EINPROGRESS) |
| 260 | break; |
| 261 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 262 | /* |
| 263 | * This cpu has to do the parallel processing of the next |
| 264 | * object. It's waiting in the cpu's parallelization queue, |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 265 | * so exit immediately. |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 266 | */ |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 267 | if (PTR_ERR(padata) == -ENODATA) { |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 268 | del_timer(&pd->timer); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 269 | spin_unlock_bh(&pd->lock); |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 270 | return; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 271 | } |
| 272 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 273 | squeue = per_cpu_ptr(pd->squeue, padata->cb_cpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 274 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 275 | spin_lock(&squeue->serial.lock); |
| 276 | list_add_tail(&padata->list, &squeue->serial.list); |
| 277 | spin_unlock(&squeue->serial.lock); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 278 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 279 | queue_work_on(padata->cb_cpu, pinst->wq, &squeue->work); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | spin_unlock_bh(&pd->lock); |
| 283 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 284 | /* |
| 285 | * The next object that needs serialization might have arrived to |
| 286 | * the reorder queues in the meantime, we will be called again |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 287 | * from the timer function if no one else cares for it. |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 288 | */ |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 289 | if (atomic_read(&pd->reorder_objects) |
| 290 | && !(pinst->flags & PADATA_RESET)) |
| 291 | mod_timer(&pd->timer, jiffies + HZ); |
| 292 | else |
| 293 | del_timer(&pd->timer); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 294 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 295 | return; |
| 296 | } |
| 297 | |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 298 | static void padata_reorder_timer(unsigned long arg) |
| 299 | { |
| 300 | struct parallel_data *pd = (struct parallel_data *)arg; |
| 301 | |
| 302 | padata_reorder(pd); |
| 303 | } |
| 304 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 305 | static void padata_serial_worker(struct work_struct *serial_work) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 306 | { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 307 | struct padata_serial_queue *squeue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 308 | struct parallel_data *pd; |
| 309 | LIST_HEAD(local_list); |
| 310 | |
| 311 | local_bh_disable(); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 312 | squeue = container_of(serial_work, struct padata_serial_queue, work); |
| 313 | pd = squeue->pd; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 314 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 315 | spin_lock(&squeue->serial.lock); |
| 316 | list_replace_init(&squeue->serial.list, &local_list); |
| 317 | spin_unlock(&squeue->serial.lock); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 318 | |
| 319 | while (!list_empty(&local_list)) { |
| 320 | struct padata_priv *padata; |
| 321 | |
| 322 | padata = list_entry(local_list.next, |
| 323 | struct padata_priv, list); |
| 324 | |
| 325 | list_del_init(&padata->list); |
| 326 | |
| 327 | padata->serial(padata); |
| 328 | atomic_dec(&pd->refcnt); |
| 329 | } |
| 330 | local_bh_enable(); |
| 331 | } |
| 332 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 333 | /** |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 334 | * padata_do_serial - padata serialization function |
| 335 | * |
| 336 | * @padata: object to be serialized. |
| 337 | * |
| 338 | * padata_do_serial must be called for every parallelized object. |
| 339 | * The serialization callback function will run with BHs off. |
| 340 | */ |
| 341 | void padata_do_serial(struct padata_priv *padata) |
| 342 | { |
| 343 | int cpu; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 344 | struct padata_parallel_queue *pqueue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 345 | struct parallel_data *pd; |
| 346 | |
| 347 | pd = padata->pd; |
| 348 | |
| 349 | cpu = get_cpu(); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 350 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 351 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 352 | spin_lock(&pqueue->reorder.lock); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 353 | atomic_inc(&pd->reorder_objects); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 354 | list_add_tail(&padata->list, &pqueue->reorder.list); |
| 355 | spin_unlock(&pqueue->reorder.lock); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 356 | |
| 357 | put_cpu(); |
| 358 | |
| 359 | padata_reorder(pd); |
| 360 | } |
| 361 | EXPORT_SYMBOL(padata_do_serial); |
| 362 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 363 | static int padata_setup_cpumasks(struct parallel_data *pd, |
| 364 | const struct cpumask *pcpumask, |
| 365 | const struct cpumask *cbcpumask) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 366 | { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 367 | if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL)) |
| 368 | return -ENOMEM; |
| 369 | |
| 370 | cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_active_mask); |
| 371 | if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) { |
| 372 | free_cpumask_var(pd->cpumask.cbcpu); |
| 373 | return -ENOMEM; |
| 374 | } |
| 375 | |
| 376 | cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_active_mask); |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | static void __padata_list_init(struct padata_list *pd_list) |
| 381 | { |
| 382 | INIT_LIST_HEAD(&pd_list->list); |
| 383 | spin_lock_init(&pd_list->lock); |
| 384 | } |
| 385 | |
| 386 | /* Initialize all percpu queues used by serial workers */ |
| 387 | static void padata_init_squeues(struct parallel_data *pd) |
| 388 | { |
| 389 | int cpu; |
| 390 | struct padata_serial_queue *squeue; |
| 391 | |
| 392 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
| 393 | squeue = per_cpu_ptr(pd->squeue, cpu); |
| 394 | squeue->pd = pd; |
| 395 | __padata_list_init(&squeue->serial); |
| 396 | INIT_WORK(&squeue->work, padata_serial_worker); |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | /* Initialize all percpu queues used by parallel workers */ |
| 401 | static void padata_init_pqueues(struct parallel_data *pd) |
| 402 | { |
| 403 | int cpu_index, num_cpus, cpu; |
| 404 | struct padata_parallel_queue *pqueue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 405 | |
| 406 | cpu_index = 0; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 407 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
| 408 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
| 409 | pqueue->pd = pd; |
| 410 | pqueue->cpu_index = cpu_index; |
Steffen Klassert | fad3a90 | 2010-07-20 08:48:34 +0200 | [diff] [blame] | 411 | cpu_index++; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 412 | |
| 413 | __padata_list_init(&pqueue->reorder); |
| 414 | __padata_list_init(&pqueue->parallel); |
| 415 | INIT_WORK(&pqueue->work, padata_parallel_worker); |
| 416 | atomic_set(&pqueue->num_obj, 0); |
| 417 | } |
| 418 | |
| 419 | num_cpus = cpumask_weight(pd->cpumask.pcpu); |
Steffen Klassert | b89661d | 2010-07-20 08:49:20 +0200 | [diff] [blame] | 420 | pd->max_seq_nr = num_cpus ? (MAX_SEQ_NR / num_cpus) * num_cpus - 1 : 0; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | /* Allocate and initialize the internal cpumask dependend resources. */ |
| 424 | static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, |
| 425 | const struct cpumask *pcpumask, |
| 426 | const struct cpumask *cbcpumask) |
| 427 | { |
| 428 | struct parallel_data *pd; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 429 | |
| 430 | pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); |
| 431 | if (!pd) |
| 432 | goto err; |
| 433 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 434 | pd->pqueue = alloc_percpu(struct padata_parallel_queue); |
| 435 | if (!pd->pqueue) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 436 | goto err_free_pd; |
| 437 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 438 | pd->squeue = alloc_percpu(struct padata_serial_queue); |
| 439 | if (!pd->squeue) |
| 440 | goto err_free_pqueue; |
| 441 | if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0) |
| 442 | goto err_free_squeue; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 443 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 444 | padata_init_pqueues(pd); |
| 445 | padata_init_squeues(pd); |
Steffen Klassert | d46a5ac | 2010-05-19 13:43:14 +1000 | [diff] [blame] | 446 | setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 447 | atomic_set(&pd->seq_nr, -1); |
| 448 | atomic_set(&pd->reorder_objects, 0); |
| 449 | atomic_set(&pd->refcnt, 0); |
| 450 | pd->pinst = pinst; |
| 451 | spin_lock_init(&pd->lock); |
| 452 | |
| 453 | return pd; |
| 454 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 455 | err_free_squeue: |
| 456 | free_percpu(pd->squeue); |
| 457 | err_free_pqueue: |
| 458 | free_percpu(pd->pqueue); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 459 | err_free_pd: |
| 460 | kfree(pd); |
| 461 | err: |
| 462 | return NULL; |
| 463 | } |
| 464 | |
| 465 | static void padata_free_pd(struct parallel_data *pd) |
| 466 | { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 467 | free_cpumask_var(pd->cpumask.pcpu); |
| 468 | free_cpumask_var(pd->cpumask.cbcpu); |
| 469 | free_percpu(pd->pqueue); |
| 470 | free_percpu(pd->squeue); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 471 | kfree(pd); |
| 472 | } |
| 473 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 474 | /* Flush all objects out of the padata queues. */ |
Steffen Klassert | 2b73b07 | 2010-05-19 13:43:46 +1000 | [diff] [blame] | 475 | static void padata_flush_queues(struct parallel_data *pd) |
| 476 | { |
| 477 | int cpu; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 478 | struct padata_parallel_queue *pqueue; |
| 479 | struct padata_serial_queue *squeue; |
Steffen Klassert | 2b73b07 | 2010-05-19 13:43:46 +1000 | [diff] [blame] | 480 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 481 | for_each_cpu(cpu, pd->cpumask.pcpu) { |
| 482 | pqueue = per_cpu_ptr(pd->pqueue, cpu); |
| 483 | flush_work(&pqueue->work); |
Steffen Klassert | 2b73b07 | 2010-05-19 13:43:46 +1000 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | del_timer_sync(&pd->timer); |
| 487 | |
| 488 | if (atomic_read(&pd->reorder_objects)) |
| 489 | padata_reorder(pd); |
| 490 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 491 | for_each_cpu(cpu, pd->cpumask.cbcpu) { |
| 492 | squeue = per_cpu_ptr(pd->squeue, cpu); |
| 493 | flush_work(&squeue->work); |
Steffen Klassert | 2b73b07 | 2010-05-19 13:43:46 +1000 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | BUG_ON(atomic_read(&pd->refcnt) != 0); |
| 497 | } |
| 498 | |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 499 | static void __padata_start(struct padata_instance *pinst) |
| 500 | { |
| 501 | pinst->flags |= PADATA_INIT; |
| 502 | } |
| 503 | |
Steffen Klassert | ee83655 | 2010-07-07 15:30:47 +0200 | [diff] [blame] | 504 | static void __padata_stop(struct padata_instance *pinst) |
| 505 | { |
| 506 | if (!(pinst->flags & PADATA_INIT)) |
| 507 | return; |
| 508 | |
| 509 | pinst->flags &= ~PADATA_INIT; |
| 510 | |
| 511 | synchronize_rcu(); |
| 512 | |
| 513 | get_online_cpus(); |
| 514 | padata_flush_queues(pinst->pd); |
| 515 | put_online_cpus(); |
| 516 | } |
| 517 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 518 | /* Replace the internal control structure with a new one. */ |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 519 | static void padata_replace(struct padata_instance *pinst, |
| 520 | struct parallel_data *pd_new) |
| 521 | { |
| 522 | struct parallel_data *pd_old = pinst->pd; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 523 | int notification_mask = 0; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 524 | |
| 525 | pinst->flags |= PADATA_RESET; |
| 526 | |
| 527 | rcu_assign_pointer(pinst->pd, pd_new); |
| 528 | |
| 529 | synchronize_rcu(); |
| 530 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 531 | if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu)) |
| 532 | notification_mask |= PADATA_CPU_PARALLEL; |
| 533 | if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) |
| 534 | notification_mask |= PADATA_CPU_SERIAL; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 535 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 536 | padata_flush_queues(pd_old); |
| 537 | padata_free_pd(pd_old); |
| 538 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 539 | if (notification_mask) |
| 540 | blocking_notifier_call_chain(&pinst->cpumask_change_notifier, |
Steffen Klassert | c635696 | 2010-07-27 07:15:50 +0200 | [diff] [blame] | 541 | notification_mask, |
| 542 | &pd_new->cpumask); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 543 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 544 | pinst->flags &= ~PADATA_RESET; |
| 545 | } |
| 546 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 547 | /** |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 548 | * padata_register_cpumask_notifier - Registers a notifier that will be called |
| 549 | * if either pcpu or cbcpu or both cpumasks change. |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 550 | * |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 551 | * @pinst: A poineter to padata instance |
| 552 | * @nblock: A pointer to notifier block. |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 553 | */ |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 554 | int padata_register_cpumask_notifier(struct padata_instance *pinst, |
| 555 | struct notifier_block *nblock) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 556 | { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 557 | return blocking_notifier_chain_register(&pinst->cpumask_change_notifier, |
| 558 | nblock); |
| 559 | } |
| 560 | EXPORT_SYMBOL(padata_register_cpumask_notifier); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 561 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 562 | /** |
| 563 | * padata_unregister_cpumask_notifier - Unregisters cpumask notifier |
| 564 | * registered earlier using padata_register_cpumask_notifier |
| 565 | * |
| 566 | * @pinst: A pointer to data instance. |
| 567 | * @nlock: A pointer to notifier block. |
| 568 | */ |
| 569 | int padata_unregister_cpumask_notifier(struct padata_instance *pinst, |
| 570 | struct notifier_block *nblock) |
| 571 | { |
| 572 | return blocking_notifier_chain_unregister( |
| 573 | &pinst->cpumask_change_notifier, |
| 574 | nblock); |
| 575 | } |
| 576 | EXPORT_SYMBOL(padata_unregister_cpumask_notifier); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 577 | |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 578 | |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 579 | /* If cpumask contains no active cpu, we mark the instance as invalid. */ |
| 580 | static bool padata_validate_cpumask(struct padata_instance *pinst, |
| 581 | const struct cpumask *cpumask) |
| 582 | { |
| 583 | if (!cpumask_intersects(cpumask, cpu_active_mask)) { |
| 584 | pinst->flags |= PADATA_INVALID; |
| 585 | return false; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 586 | } |
| 587 | |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 588 | pinst->flags &= ~PADATA_INVALID; |
| 589 | return true; |
| 590 | } |
| 591 | |
Steffen Klassert | 65ff577 | 2010-07-27 07:15:06 +0200 | [diff] [blame] | 592 | static int __padata_set_cpumasks(struct padata_instance *pinst, |
| 593 | cpumask_var_t pcpumask, |
| 594 | cpumask_var_t cbcpumask) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 595 | { |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 596 | int valid; |
Steffen Klassert | 65ff577 | 2010-07-27 07:15:06 +0200 | [diff] [blame] | 597 | struct parallel_data *pd; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 598 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 599 | valid = padata_validate_cpumask(pinst, pcpumask); |
| 600 | if (!valid) { |
| 601 | __padata_stop(pinst); |
| 602 | goto out_replace; |
| 603 | } |
| 604 | |
| 605 | valid = padata_validate_cpumask(pinst, cbcpumask); |
Steffen Klassert | b89661d | 2010-07-20 08:49:20 +0200 | [diff] [blame] | 606 | if (!valid) |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 607 | __padata_stop(pinst); |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 608 | |
Steffen Klassert | b89661d | 2010-07-20 08:49:20 +0200 | [diff] [blame] | 609 | out_replace: |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 610 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
Steffen Klassert | 65ff577 | 2010-07-27 07:15:06 +0200 | [diff] [blame] | 611 | if (!pd) |
| 612 | return -ENOMEM; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 613 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 614 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
| 615 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 616 | |
| 617 | padata_replace(pinst, pd); |
| 618 | |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 619 | if (valid) |
| 620 | __padata_start(pinst); |
| 621 | |
Steffen Klassert | 65ff577 | 2010-07-27 07:15:06 +0200 | [diff] [blame] | 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | /** |
| 626 | * padata_set_cpumasks - Set both parallel and serial cpumasks. The first |
| 627 | * one is used by parallel workers and the second one |
| 628 | * by the wokers doing serialization. |
| 629 | * |
| 630 | * @pinst: padata instance |
| 631 | * @pcpumask: the cpumask to use for parallel workers |
| 632 | * @cbcpumask: the cpumsak to use for serial workers |
| 633 | */ |
| 634 | int padata_set_cpumasks(struct padata_instance *pinst, cpumask_var_t pcpumask, |
| 635 | cpumask_var_t cbcpumask) |
| 636 | { |
| 637 | int err; |
| 638 | |
| 639 | mutex_lock(&pinst->lock); |
| 640 | get_online_cpus(); |
| 641 | |
| 642 | err = __padata_set_cpumasks(pinst, pcpumask, cbcpumask); |
| 643 | |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 644 | put_online_cpus(); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 645 | mutex_unlock(&pinst->lock); |
| 646 | |
| 647 | return err; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 648 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 649 | } |
Steffen Klassert | 65ff577 | 2010-07-27 07:15:06 +0200 | [diff] [blame] | 650 | EXPORT_SYMBOL(padata_set_cpumasks); |
| 651 | |
| 652 | /** |
| 653 | * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value |
| 654 | * equivalent to @cpumask. |
| 655 | * |
| 656 | * @pinst: padata instance |
| 657 | * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding |
| 658 | * to parallel and serial cpumasks respectively. |
| 659 | * @cpumask: the cpumask to use |
| 660 | */ |
| 661 | int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, |
| 662 | cpumask_var_t cpumask) |
| 663 | { |
| 664 | struct cpumask *serial_mask, *parallel_mask; |
| 665 | int err = -EINVAL; |
| 666 | |
| 667 | mutex_lock(&pinst->lock); |
| 668 | get_online_cpus(); |
| 669 | |
| 670 | switch (cpumask_type) { |
| 671 | case PADATA_CPU_PARALLEL: |
| 672 | serial_mask = pinst->cpumask.cbcpu; |
| 673 | parallel_mask = cpumask; |
| 674 | break; |
| 675 | case PADATA_CPU_SERIAL: |
| 676 | parallel_mask = pinst->cpumask.pcpu; |
| 677 | serial_mask = cpumask; |
| 678 | break; |
| 679 | default: |
| 680 | goto out; |
| 681 | } |
| 682 | |
| 683 | err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask); |
| 684 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 685 | out: |
| 686 | put_online_cpus(); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 687 | mutex_unlock(&pinst->lock); |
| 688 | |
| 689 | return err; |
| 690 | } |
| 691 | EXPORT_SYMBOL(padata_set_cpumask); |
| 692 | |
| 693 | static int __padata_add_cpu(struct padata_instance *pinst, int cpu) |
| 694 | { |
| 695 | struct parallel_data *pd; |
| 696 | |
| 697 | if (cpumask_test_cpu(cpu, cpu_active_mask)) { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 698 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
| 699 | pinst->cpumask.cbcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 700 | if (!pd) |
| 701 | return -ENOMEM; |
| 702 | |
| 703 | padata_replace(pinst, pd); |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 704 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 705 | if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) && |
| 706 | padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 707 | __padata_start(pinst); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 708 | } |
| 709 | |
| 710 | return 0; |
| 711 | } |
| 712 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 713 | /** |
| 714 | * padata_add_cpu - add a cpu to one or both(parallel and serial) |
| 715 | * padata cpumasks. |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 716 | * |
| 717 | * @pinst: padata instance |
| 718 | * @cpu: cpu to add |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 719 | * @mask: bitmask of flags specifying to which cpumask @cpu shuld be added. |
| 720 | * The @mask may be any combination of the following flags: |
| 721 | * PADATA_CPU_SERIAL - serial cpumask |
| 722 | * PADATA_CPU_PARALLEL - parallel cpumask |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 723 | */ |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 724 | |
| 725 | int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 726 | { |
| 727 | int err; |
| 728 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 729 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
| 730 | return -EINVAL; |
| 731 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 732 | mutex_lock(&pinst->lock); |
| 733 | |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 734 | get_online_cpus(); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 735 | if (mask & PADATA_CPU_SERIAL) |
| 736 | cpumask_set_cpu(cpu, pinst->cpumask.cbcpu); |
| 737 | if (mask & PADATA_CPU_PARALLEL) |
| 738 | cpumask_set_cpu(cpu, pinst->cpumask.pcpu); |
| 739 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 740 | err = __padata_add_cpu(pinst, cpu); |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 741 | put_online_cpus(); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 742 | |
| 743 | mutex_unlock(&pinst->lock); |
| 744 | |
| 745 | return err; |
| 746 | } |
| 747 | EXPORT_SYMBOL(padata_add_cpu); |
| 748 | |
| 749 | static int __padata_remove_cpu(struct padata_instance *pinst, int cpu) |
| 750 | { |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 751 | struct parallel_data *pd = NULL; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 752 | |
| 753 | if (cpumask_test_cpu(cpu, cpu_online_mask)) { |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 754 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 755 | if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) || |
Steffen Klassert | b89661d | 2010-07-20 08:49:20 +0200 | [diff] [blame] | 756 | !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 757 | __padata_stop(pinst); |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 758 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 759 | pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu, |
| 760 | pinst->cpumask.cbcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 761 | if (!pd) |
| 762 | return -ENOMEM; |
| 763 | |
| 764 | padata_replace(pinst, pd); |
| 765 | } |
| 766 | |
| 767 | return 0; |
| 768 | } |
| 769 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 770 | /** |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 771 | * padata_remove_cpu - remove a cpu from the one or both(serial and parallel) |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 772 | * padata cpumasks. |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 773 | * |
| 774 | * @pinst: padata instance |
| 775 | * @cpu: cpu to remove |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 776 | * @mask: bitmask specifying from which cpumask @cpu should be removed |
| 777 | * The @mask may be any combination of the following flags: |
| 778 | * PADATA_CPU_SERIAL - serial cpumask |
| 779 | * PADATA_CPU_PARALLEL - parallel cpumask |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 780 | */ |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 781 | int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 782 | { |
| 783 | int err; |
| 784 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 785 | if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL))) |
| 786 | return -EINVAL; |
| 787 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 788 | mutex_lock(&pinst->lock); |
| 789 | |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 790 | get_online_cpus(); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 791 | if (mask & PADATA_CPU_SERIAL) |
| 792 | cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu); |
| 793 | if (mask & PADATA_CPU_PARALLEL) |
| 794 | cpumask_clear_cpu(cpu, pinst->cpumask.pcpu); |
| 795 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 796 | err = __padata_remove_cpu(pinst, cpu); |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 797 | put_online_cpus(); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 798 | |
| 799 | mutex_unlock(&pinst->lock); |
| 800 | |
| 801 | return err; |
| 802 | } |
| 803 | EXPORT_SYMBOL(padata_remove_cpu); |
| 804 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 805 | /** |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 806 | * padata_start - start the parallel processing |
| 807 | * |
| 808 | * @pinst: padata instance to start |
| 809 | */ |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 810 | int padata_start(struct padata_instance *pinst) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 811 | { |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 812 | int err = 0; |
| 813 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 814 | mutex_lock(&pinst->lock); |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 815 | |
| 816 | if (pinst->flags & PADATA_INVALID) |
| 817 | err =-EINVAL; |
| 818 | |
| 819 | __padata_start(pinst); |
| 820 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 821 | mutex_unlock(&pinst->lock); |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 822 | |
| 823 | return err; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 824 | } |
| 825 | EXPORT_SYMBOL(padata_start); |
| 826 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 827 | /** |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 828 | * padata_stop - stop the parallel processing |
| 829 | * |
| 830 | * @pinst: padata instance to stop |
| 831 | */ |
| 832 | void padata_stop(struct padata_instance *pinst) |
| 833 | { |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 834 | mutex_lock(&pinst->lock); |
Steffen Klassert | ee83655 | 2010-07-07 15:30:47 +0200 | [diff] [blame] | 835 | __padata_stop(pinst); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 836 | mutex_unlock(&pinst->lock); |
| 837 | } |
| 838 | EXPORT_SYMBOL(padata_stop); |
| 839 | |
Steffen Klassert | e2cb2f1 | 2010-04-29 14:40:10 +0200 | [diff] [blame] | 840 | #ifdef CONFIG_HOTPLUG_CPU |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 841 | |
| 842 | static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu) |
| 843 | { |
| 844 | return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) || |
| 845 | cpumask_test_cpu(cpu, pinst->cpumask.cbcpu); |
| 846 | } |
| 847 | |
| 848 | |
Henrik Kretzschmar | 975d260 | 2010-03-29 16:15:31 +0800 | [diff] [blame] | 849 | static int padata_cpu_callback(struct notifier_block *nfb, |
| 850 | unsigned long action, void *hcpu) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 851 | { |
| 852 | int err; |
| 853 | struct padata_instance *pinst; |
| 854 | int cpu = (unsigned long)hcpu; |
| 855 | |
| 856 | pinst = container_of(nfb, struct padata_instance, cpu_notifier); |
| 857 | |
| 858 | switch (action) { |
| 859 | case CPU_ONLINE: |
| 860 | case CPU_ONLINE_FROZEN: |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 861 | if (!pinst_has_cpu(pinst, cpu)) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 862 | break; |
| 863 | mutex_lock(&pinst->lock); |
| 864 | err = __padata_add_cpu(pinst, cpu); |
| 865 | mutex_unlock(&pinst->lock); |
| 866 | if (err) |
Akinobu Mita | 80b5184 | 2010-05-26 14:43:32 -0700 | [diff] [blame] | 867 | return notifier_from_errno(err); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 868 | break; |
| 869 | |
| 870 | case CPU_DOWN_PREPARE: |
| 871 | case CPU_DOWN_PREPARE_FROZEN: |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 872 | if (!pinst_has_cpu(pinst, cpu)) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 873 | break; |
| 874 | mutex_lock(&pinst->lock); |
| 875 | err = __padata_remove_cpu(pinst, cpu); |
| 876 | mutex_unlock(&pinst->lock); |
| 877 | if (err) |
Akinobu Mita | 80b5184 | 2010-05-26 14:43:32 -0700 | [diff] [blame] | 878 | return notifier_from_errno(err); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 879 | break; |
| 880 | |
| 881 | case CPU_UP_CANCELED: |
| 882 | case CPU_UP_CANCELED_FROZEN: |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 883 | if (!pinst_has_cpu(pinst, cpu)) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 884 | break; |
| 885 | mutex_lock(&pinst->lock); |
| 886 | __padata_remove_cpu(pinst, cpu); |
| 887 | mutex_unlock(&pinst->lock); |
| 888 | |
| 889 | case CPU_DOWN_FAILED: |
| 890 | case CPU_DOWN_FAILED_FROZEN: |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 891 | if (!pinst_has_cpu(pinst, cpu)) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 892 | break; |
| 893 | mutex_lock(&pinst->lock); |
| 894 | __padata_add_cpu(pinst, cpu); |
| 895 | mutex_unlock(&pinst->lock); |
| 896 | } |
| 897 | |
| 898 | return NOTIFY_OK; |
| 899 | } |
Steffen Klassert | e2cb2f1 | 2010-04-29 14:40:10 +0200 | [diff] [blame] | 900 | #endif |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 901 | |
Dan Kruchinin | 5e017dc | 2010-07-14 14:33:08 +0400 | [diff] [blame] | 902 | static void __padata_free(struct padata_instance *pinst) |
| 903 | { |
| 904 | #ifdef CONFIG_HOTPLUG_CPU |
| 905 | unregister_hotcpu_notifier(&pinst->cpu_notifier); |
| 906 | #endif |
| 907 | |
| 908 | padata_stop(pinst); |
| 909 | padata_free_pd(pinst->pd); |
| 910 | free_cpumask_var(pinst->cpumask.pcpu); |
| 911 | free_cpumask_var(pinst->cpumask.cbcpu); |
| 912 | kfree(pinst); |
| 913 | } |
| 914 | |
| 915 | #define kobj2pinst(_kobj) \ |
| 916 | container_of(_kobj, struct padata_instance, kobj) |
| 917 | #define attr2pentry(_attr) \ |
| 918 | container_of(_attr, struct padata_sysfs_entry, attr) |
| 919 | |
| 920 | static void padata_sysfs_release(struct kobject *kobj) |
| 921 | { |
| 922 | struct padata_instance *pinst = kobj2pinst(kobj); |
| 923 | __padata_free(pinst); |
| 924 | } |
| 925 | |
| 926 | struct padata_sysfs_entry { |
| 927 | struct attribute attr; |
| 928 | ssize_t (*show)(struct padata_instance *, struct attribute *, char *); |
| 929 | ssize_t (*store)(struct padata_instance *, struct attribute *, |
| 930 | const char *, size_t); |
| 931 | }; |
| 932 | |
| 933 | static ssize_t show_cpumask(struct padata_instance *pinst, |
| 934 | struct attribute *attr, char *buf) |
| 935 | { |
| 936 | struct cpumask *cpumask; |
| 937 | ssize_t len; |
| 938 | |
| 939 | mutex_lock(&pinst->lock); |
| 940 | if (!strcmp(attr->name, "serial_cpumask")) |
| 941 | cpumask = pinst->cpumask.cbcpu; |
| 942 | else |
| 943 | cpumask = pinst->cpumask.pcpu; |
| 944 | |
| 945 | len = bitmap_scnprintf(buf, PAGE_SIZE, cpumask_bits(cpumask), |
| 946 | nr_cpu_ids); |
| 947 | if (PAGE_SIZE - len < 2) |
| 948 | len = -EINVAL; |
| 949 | else |
| 950 | len += sprintf(buf + len, "\n"); |
| 951 | |
| 952 | mutex_unlock(&pinst->lock); |
| 953 | return len; |
| 954 | } |
| 955 | |
| 956 | static ssize_t store_cpumask(struct padata_instance *pinst, |
| 957 | struct attribute *attr, |
| 958 | const char *buf, size_t count) |
| 959 | { |
| 960 | cpumask_var_t new_cpumask; |
| 961 | ssize_t ret; |
| 962 | int mask_type; |
| 963 | |
| 964 | if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL)) |
| 965 | return -ENOMEM; |
| 966 | |
| 967 | ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask), |
| 968 | nr_cpumask_bits); |
| 969 | if (ret < 0) |
| 970 | goto out; |
| 971 | |
| 972 | mask_type = !strcmp(attr->name, "serial_cpumask") ? |
| 973 | PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL; |
| 974 | ret = padata_set_cpumask(pinst, mask_type, new_cpumask); |
| 975 | if (!ret) |
| 976 | ret = count; |
| 977 | |
| 978 | out: |
| 979 | free_cpumask_var(new_cpumask); |
| 980 | return ret; |
| 981 | } |
| 982 | |
| 983 | #define PADATA_ATTR_RW(_name, _show_name, _store_name) \ |
| 984 | static struct padata_sysfs_entry _name##_attr = \ |
| 985 | __ATTR(_name, 0644, _show_name, _store_name) |
| 986 | #define PADATA_ATTR_RO(_name, _show_name) \ |
| 987 | static struct padata_sysfs_entry _name##_attr = \ |
| 988 | __ATTR(_name, 0400, _show_name, NULL) |
| 989 | |
| 990 | PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask); |
| 991 | PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask); |
| 992 | |
| 993 | /* |
| 994 | * Padata sysfs provides the following objects: |
| 995 | * serial_cpumask [RW] - cpumask for serial workers |
| 996 | * parallel_cpumask [RW] - cpumask for parallel workers |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 997 | */ |
Dan Kruchinin | 5e017dc | 2010-07-14 14:33:08 +0400 | [diff] [blame] | 998 | static struct attribute *padata_default_attrs[] = { |
| 999 | &serial_cpumask_attr.attr, |
| 1000 | ¶llel_cpumask_attr.attr, |
| 1001 | NULL, |
| 1002 | }; |
| 1003 | |
| 1004 | static ssize_t padata_sysfs_show(struct kobject *kobj, |
| 1005 | struct attribute *attr, char *buf) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1006 | { |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1007 | struct padata_instance *pinst; |
Dan Kruchinin | 5e017dc | 2010-07-14 14:33:08 +0400 | [diff] [blame] | 1008 | struct padata_sysfs_entry *pentry; |
| 1009 | ssize_t ret = -EIO; |
| 1010 | |
| 1011 | pinst = kobj2pinst(kobj); |
| 1012 | pentry = attr2pentry(attr); |
| 1013 | if (pentry->show) |
| 1014 | ret = pentry->show(pinst, attr, buf); |
| 1015 | |
| 1016 | return ret; |
| 1017 | } |
| 1018 | |
| 1019 | static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr, |
| 1020 | const char *buf, size_t count) |
| 1021 | { |
| 1022 | struct padata_instance *pinst; |
| 1023 | struct padata_sysfs_entry *pentry; |
| 1024 | ssize_t ret = -EIO; |
| 1025 | |
| 1026 | pinst = kobj2pinst(kobj); |
| 1027 | pentry = attr2pentry(attr); |
| 1028 | if (pentry->show) |
| 1029 | ret = pentry->store(pinst, attr, buf, count); |
| 1030 | |
| 1031 | return ret; |
| 1032 | } |
| 1033 | |
| 1034 | static const struct sysfs_ops padata_sysfs_ops = { |
| 1035 | .show = padata_sysfs_show, |
| 1036 | .store = padata_sysfs_store, |
| 1037 | }; |
| 1038 | |
| 1039 | static struct kobj_type padata_attr_type = { |
| 1040 | .sysfs_ops = &padata_sysfs_ops, |
| 1041 | .default_attrs = padata_default_attrs, |
| 1042 | .release = padata_sysfs_release, |
| 1043 | }; |
| 1044 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1045 | /** |
Steffen Klassert | e6cc117 | 2010-07-27 07:14:28 +0200 | [diff] [blame] | 1046 | * padata_alloc_possible - Allocate and initialize padata instance. |
| 1047 | * Use the cpu_possible_mask for serial and |
| 1048 | * parallel workers. |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1049 | * |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1050 | * @wq: workqueue to use for the allocated padata instance |
| 1051 | */ |
Steffen Klassert | e6cc117 | 2010-07-27 07:14:28 +0200 | [diff] [blame] | 1052 | struct padata_instance *padata_alloc_possible(struct workqueue_struct *wq) |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1053 | { |
Steffen Klassert | e6cc117 | 2010-07-27 07:14:28 +0200 | [diff] [blame] | 1054 | return padata_alloc(wq, cpu_possible_mask, cpu_possible_mask); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1055 | } |
Steffen Klassert | e6cc117 | 2010-07-27 07:14:28 +0200 | [diff] [blame] | 1056 | EXPORT_SYMBOL(padata_alloc_possible); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1057 | |
| 1058 | /** |
Steffen Klassert | e6cc117 | 2010-07-27 07:14:28 +0200 | [diff] [blame] | 1059 | * padata_alloc - allocate and initialize a padata instance and specify |
| 1060 | * cpumasks for serial and parallel workers. |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1061 | * |
| 1062 | * @wq: workqueue to use for the allocated padata instance |
| 1063 | * @pcpumask: cpumask that will be used for padata parallelization |
| 1064 | * @cbcpumask: cpumask that will be used for padata serialization |
| 1065 | */ |
Steffen Klassert | e6cc117 | 2010-07-27 07:14:28 +0200 | [diff] [blame] | 1066 | struct padata_instance *padata_alloc(struct workqueue_struct *wq, |
| 1067 | const struct cpumask *pcpumask, |
| 1068 | const struct cpumask *cbcpumask) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1069 | { |
| 1070 | struct padata_instance *pinst; |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 1071 | struct parallel_data *pd = NULL; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1072 | |
| 1073 | pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL); |
| 1074 | if (!pinst) |
| 1075 | goto err; |
| 1076 | |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 1077 | get_online_cpus(); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1078 | if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL)) |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1079 | goto err_free_inst; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1080 | if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) { |
| 1081 | free_cpumask_var(pinst->cpumask.pcpu); |
| 1082 | goto err_free_inst; |
Steffen Klassert | 33e5445 | 2010-07-07 15:31:26 +0200 | [diff] [blame] | 1083 | } |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1084 | if (!padata_validate_cpumask(pinst, pcpumask) || |
| 1085 | !padata_validate_cpumask(pinst, cbcpumask)) |
| 1086 | goto err_free_masks; |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1087 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1088 | pd = padata_alloc_pd(pinst, pcpumask, cbcpumask); |
| 1089 | if (!pd) |
| 1090 | goto err_free_masks; |
Steffen Klassert | 7478138 | 2010-03-04 13:30:22 +0800 | [diff] [blame] | 1091 | |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1092 | rcu_assign_pointer(pinst->pd, pd); |
| 1093 | |
| 1094 | pinst->wq = wq; |
| 1095 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1096 | cpumask_copy(pinst->cpumask.pcpu, pcpumask); |
| 1097 | cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1098 | |
| 1099 | pinst->flags = 0; |
| 1100 | |
Steffen Klassert | e2cb2f1 | 2010-04-29 14:40:10 +0200 | [diff] [blame] | 1101 | #ifdef CONFIG_HOTPLUG_CPU |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1102 | pinst->cpu_notifier.notifier_call = padata_cpu_callback; |
| 1103 | pinst->cpu_notifier.priority = 0; |
Steffen Klassert | e2cb2f1 | 2010-04-29 14:40:10 +0200 | [diff] [blame] | 1104 | register_hotcpu_notifier(&pinst->cpu_notifier); |
| 1105 | #endif |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1106 | |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 1107 | put_online_cpus(); |
| 1108 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1109 | BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier); |
Dan Kruchinin | 5e017dc | 2010-07-14 14:33:08 +0400 | [diff] [blame] | 1110 | kobject_init(&pinst->kobj, &padata_attr_type); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1111 | mutex_init(&pinst->lock); |
| 1112 | |
| 1113 | return pinst; |
| 1114 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 1115 | err_free_masks: |
| 1116 | free_cpumask_var(pinst->cpumask.pcpu); |
| 1117 | free_cpumask_var(pinst->cpumask.cbcpu); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1118 | err_free_inst: |
| 1119 | kfree(pinst); |
Steffen Klassert | 6751fb3 | 2010-04-29 14:42:30 +0200 | [diff] [blame] | 1120 | put_online_cpus(); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1121 | err: |
| 1122 | return NULL; |
| 1123 | } |
| 1124 | EXPORT_SYMBOL(padata_alloc); |
| 1125 | |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 1126 | /** |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1127 | * padata_free - free a padata instance |
| 1128 | * |
Steffen Klassert | 0198ffd | 2010-05-19 13:44:27 +1000 | [diff] [blame] | 1129 | * @padata_inst: padata instance to free |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1130 | */ |
| 1131 | void padata_free(struct padata_instance *pinst) |
| 1132 | { |
Dan Kruchinin | 5e017dc | 2010-07-14 14:33:08 +0400 | [diff] [blame] | 1133 | kobject_put(&pinst->kobj); |
Steffen Klassert | 16295be | 2010-01-06 19:47:10 +1100 | [diff] [blame] | 1134 | } |
| 1135 | EXPORT_SYMBOL(padata_free); |