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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ALSA sequencer Memory Manager
4 * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
5 * Jaroslav Kysela <perex@perex.cz>
6 * 2000 by Takashi Iwai <tiwai@suse.de>
7 */
8
9#include <linux/init.h>
10#include <linux/export.h>
11#include <linux/slab.h>
12#include <linux/sched/signal.h>
13#include <linux/mm.h>
14#include <sound/core.h>
15
16#include <sound/seq_kernel.h>
17#include "seq_memory.h"
18#include "seq_queue.h"
19#include "seq_info.h"
20#include "seq_lock.h"
21
22static inline int snd_seq_pool_available(struct snd_seq_pool *pool)
23{
24 return pool->total_elements - atomic_read(&pool->counter);
25}
26
27static inline int snd_seq_output_ok(struct snd_seq_pool *pool)
28{
29 return snd_seq_pool_available(pool) >= pool->room;
30}
31
32/*
33 * Variable length event:
34 * The event like sysex uses variable length type.
35 * The external data may be stored in three different formats.
36 * 1) kernel space
37 * This is the normal case.
38 * ext.data.len = length
39 * ext.data.ptr = buffer pointer
40 * 2) user space
41 * When an event is generated via read(), the external data is
42 * kept in user space until expanded.
43 * ext.data.len = length | SNDRV_SEQ_EXT_USRPTR
44 * ext.data.ptr = userspace pointer
45 * 3) chained cells
46 * When the variable length event is enqueued (in prioq or fifo),
47 * the external data is decomposed to several cells.
48 * ext.data.len = length | SNDRV_SEQ_EXT_CHAINED
49 * ext.data.ptr = the additiona cell head
50 * -> cell.next -> cell.next -> ..
51 */
52
53/*
54 * exported:
55 * call dump function to expand external data.
56 */
57
58static int get_var_len(const struct snd_seq_event *event)
59{
60 if ((event->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
61 return -EINVAL;
62
63 return event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
64}
65
66int snd_seq_dump_var_event(const struct snd_seq_event *event,
67 snd_seq_dump_func_t func, void *private_data)
68{
69 int len, err;
70 struct snd_seq_event_cell *cell;
71
72 if ((len = get_var_len(event)) <= 0)
73 return len;
74
75 if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
76 char buf[32];
77 char __user *curptr = (char __force __user *)event->data.ext.ptr;
78 while (len > 0) {
79 int size = sizeof(buf);
80 if (len < size)
81 size = len;
82 if (copy_from_user(buf, curptr, size))
83 return -EFAULT;
84 err = func(private_data, buf, size);
85 if (err < 0)
86 return err;
87 curptr += size;
88 len -= size;
89 }
90 return 0;
91 }
92 if (!(event->data.ext.len & SNDRV_SEQ_EXT_CHAINED))
93 return func(private_data, event->data.ext.ptr, len);
94
95 cell = (struct snd_seq_event_cell *)event->data.ext.ptr;
96 for (; len > 0 && cell; cell = cell->next) {
97 int size = sizeof(struct snd_seq_event);
98 if (len < size)
99 size = len;
100 err = func(private_data, &cell->event, size);
101 if (err < 0)
102 return err;
103 len -= size;
104 }
105 return 0;
106}
107EXPORT_SYMBOL(snd_seq_dump_var_event);
108
109
110/*
111 * exported:
112 * expand the variable length event to linear buffer space.
113 */
114
115static int seq_copy_in_kernel(char **bufptr, const void *src, int size)
116{
117 memcpy(*bufptr, src, size);
118 *bufptr += size;
119 return 0;
120}
121
122static int seq_copy_in_user(char __user **bufptr, const void *src, int size)
123{
124 if (copy_to_user(*bufptr, src, size))
125 return -EFAULT;
126 *bufptr += size;
127 return 0;
128}
129
130int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
131 int in_kernel, int size_aligned)
132{
133 int len, newlen;
134 int err;
135
136 if ((len = get_var_len(event)) < 0)
137 return len;
138 newlen = len;
139 if (size_aligned > 0)
140 newlen = roundup(len, size_aligned);
141 if (count < newlen)
142 return -EAGAIN;
143
144 if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
145 if (! in_kernel)
146 return -EINVAL;
147 if (copy_from_user(buf, (void __force __user *)event->data.ext.ptr, len))
148 return -EFAULT;
149 return newlen;
150 }
151 err = snd_seq_dump_var_event(event,
152 in_kernel ? (snd_seq_dump_func_t)seq_copy_in_kernel :
153 (snd_seq_dump_func_t)seq_copy_in_user,
154 &buf);
155 return err < 0 ? err : newlen;
156}
157EXPORT_SYMBOL(snd_seq_expand_var_event);
158
159/*
160 * release this cell, free extended data if available
161 */
162
163static inline void free_cell(struct snd_seq_pool *pool,
164 struct snd_seq_event_cell *cell)
165{
166 cell->next = pool->free;
167 pool->free = cell;
168 atomic_dec(&pool->counter);
169}
170
171void snd_seq_cell_free(struct snd_seq_event_cell * cell)
172{
173 unsigned long flags;
174 struct snd_seq_pool *pool;
175
176 if (snd_BUG_ON(!cell))
177 return;
178 pool = cell->pool;
179 if (snd_BUG_ON(!pool))
180 return;
181
182 spin_lock_irqsave(&pool->lock, flags);
183 free_cell(pool, cell);
184 if (snd_seq_ev_is_variable(&cell->event)) {
185 if (cell->event.data.ext.len & SNDRV_SEQ_EXT_CHAINED) {
186 struct snd_seq_event_cell *curp, *nextptr;
187 curp = cell->event.data.ext.ptr;
188 for (; curp; curp = nextptr) {
189 nextptr = curp->next;
190 curp->next = pool->free;
191 free_cell(pool, curp);
192 }
193 }
194 }
195 if (waitqueue_active(&pool->output_sleep)) {
196 /* has enough space now? */
197 if (snd_seq_output_ok(pool))
198 wake_up(&pool->output_sleep);
199 }
200 spin_unlock_irqrestore(&pool->lock, flags);
201}
202
203
204/*
205 * allocate an event cell.
206 */
207static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
208 struct snd_seq_event_cell **cellp,
209 int nonblock, struct file *file,
210 struct mutex *mutexp)
211{
212 struct snd_seq_event_cell *cell;
213 unsigned long flags;
214 int err = -EAGAIN;
215 wait_queue_entry_t wait;
216
217 if (pool == NULL)
218 return -EINVAL;
219
220 *cellp = NULL;
221
222 init_waitqueue_entry(&wait, current);
223 spin_lock_irqsave(&pool->lock, flags);
224 if (pool->ptr == NULL) { /* not initialized */
225 pr_debug("ALSA: seq: pool is not initialized\n");
226 err = -EINVAL;
227 goto __error;
228 }
229 while (pool->free == NULL && ! nonblock && ! pool->closing) {
230
231 set_current_state(TASK_INTERRUPTIBLE);
232 add_wait_queue(&pool->output_sleep, &wait);
233 spin_unlock_irqrestore(&pool->lock, flags);
234 if (mutexp)
235 mutex_unlock(mutexp);
236 schedule();
237 if (mutexp)
238 mutex_lock(mutexp);
239 spin_lock_irqsave(&pool->lock, flags);
240 remove_wait_queue(&pool->output_sleep, &wait);
241 /* interrupted? */
242 if (signal_pending(current)) {
243 err = -ERESTARTSYS;
244 goto __error;
245 }
246 }
247 if (pool->closing) { /* closing.. */
248 err = -ENOMEM;
249 goto __error;
250 }
251
252 cell = pool->free;
253 if (cell) {
254 int used;
255 pool->free = cell->next;
256 atomic_inc(&pool->counter);
257 used = atomic_read(&pool->counter);
258 if (pool->max_used < used)
259 pool->max_used = used;
260 pool->event_alloc_success++;
261 /* clear cell pointers */
262 cell->next = NULL;
263 err = 0;
264 } else
265 pool->event_alloc_failures++;
266 *cellp = cell;
267
268__error:
269 spin_unlock_irqrestore(&pool->lock, flags);
270 return err;
271}
272
273
274/*
275 * duplicate the event to a cell.
276 * if the event has external data, the data is decomposed to additional
277 * cells.
278 */
279int snd_seq_event_dup(struct snd_seq_pool *pool, struct snd_seq_event *event,
280 struct snd_seq_event_cell **cellp, int nonblock,
281 struct file *file, struct mutex *mutexp)
282{
283 int ncells, err;
284 unsigned int extlen;
285 struct snd_seq_event_cell *cell;
286
287 *cellp = NULL;
288
289 ncells = 0;
290 extlen = 0;
291 if (snd_seq_ev_is_variable(event)) {
292 extlen = event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
293 ncells = (extlen + sizeof(struct snd_seq_event) - 1) / sizeof(struct snd_seq_event);
294 }
295 if (ncells >= pool->total_elements)
296 return -ENOMEM;
297
298 err = snd_seq_cell_alloc(pool, &cell, nonblock, file, mutexp);
299 if (err < 0)
300 return err;
301
302 /* copy the event */
303 cell->event = *event;
304
305 /* decompose */
306 if (snd_seq_ev_is_variable(event)) {
307 int len = extlen;
308 int is_chained = event->data.ext.len & SNDRV_SEQ_EXT_CHAINED;
309 int is_usrptr = event->data.ext.len & SNDRV_SEQ_EXT_USRPTR;
310 struct snd_seq_event_cell *src, *tmp, *tail;
311 char *buf;
312
313 cell->event.data.ext.len = extlen | SNDRV_SEQ_EXT_CHAINED;
314 cell->event.data.ext.ptr = NULL;
315
316 src = (struct snd_seq_event_cell *)event->data.ext.ptr;
317 buf = (char *)event->data.ext.ptr;
318 tail = NULL;
319
320 while (ncells-- > 0) {
321 int size = sizeof(struct snd_seq_event);
322 if (len < size)
323 size = len;
324 err = snd_seq_cell_alloc(pool, &tmp, nonblock, file,
325 mutexp);
326 if (err < 0)
327 goto __error;
328 if (cell->event.data.ext.ptr == NULL)
329 cell->event.data.ext.ptr = tmp;
330 if (tail)
331 tail->next = tmp;
332 tail = tmp;
333 /* copy chunk */
334 if (is_chained && src) {
335 tmp->event = src->event;
336 src = src->next;
337 } else if (is_usrptr) {
338 if (copy_from_user(&tmp->event, (char __force __user *)buf, size)) {
339 err = -EFAULT;
340 goto __error;
341 }
342 } else {
343 memcpy(&tmp->event, buf, size);
344 }
345 buf += size;
346 len -= size;
347 }
348 }
349
350 *cellp = cell;
351 return 0;
352
353__error:
354 snd_seq_cell_free(cell);
355 return err;
356}
357
358
359/* poll wait */
360int snd_seq_pool_poll_wait(struct snd_seq_pool *pool, struct file *file,
361 poll_table *wait)
362{
363 poll_wait(file, &pool->output_sleep, wait);
364 return snd_seq_output_ok(pool);
365}
366
367
368/* allocate room specified number of events */
369int snd_seq_pool_init(struct snd_seq_pool *pool)
370{
371 int cell;
372 struct snd_seq_event_cell *cellptr;
373
374 if (snd_BUG_ON(!pool))
375 return -EINVAL;
376
377 cellptr = kvmalloc_array(sizeof(struct snd_seq_event_cell), pool->size,
378 GFP_KERNEL);
379 if (!cellptr)
380 return -ENOMEM;
381
382 /* add new cells to the free cell list */
383 spin_lock_irq(&pool->lock);
384 if (pool->ptr) {
385 spin_unlock_irq(&pool->lock);
386 kvfree(cellptr);
387 return 0;
388 }
389
390 pool->ptr = cellptr;
391 pool->free = NULL;
392
393 for (cell = 0; cell < pool->size; cell++) {
394 cellptr = pool->ptr + cell;
395 cellptr->pool = pool;
396 cellptr->next = pool->free;
397 pool->free = cellptr;
398 }
399 pool->room = (pool->size + 1) / 2;
400
401 /* init statistics */
402 pool->max_used = 0;
403 pool->total_elements = pool->size;
404 spin_unlock_irq(&pool->lock);
405 return 0;
406}
407
408/* refuse the further insertion to the pool */
409void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
410{
411 unsigned long flags;
412
413 if (snd_BUG_ON(!pool))
414 return;
415 spin_lock_irqsave(&pool->lock, flags);
416 pool->closing = 1;
417 spin_unlock_irqrestore(&pool->lock, flags);
418}
419
420/* remove events */
421int snd_seq_pool_done(struct snd_seq_pool *pool)
422{
423 struct snd_seq_event_cell *ptr;
424
425 if (snd_BUG_ON(!pool))
426 return -EINVAL;
427
428 /* wait for closing all threads */
429 if (waitqueue_active(&pool->output_sleep))
430 wake_up(&pool->output_sleep);
431
432 while (atomic_read(&pool->counter) > 0)
433 schedule_timeout_uninterruptible(1);
434
435 /* release all resources */
436 spin_lock_irq(&pool->lock);
437 ptr = pool->ptr;
438 pool->ptr = NULL;
439 pool->free = NULL;
440 pool->total_elements = 0;
441 spin_unlock_irq(&pool->lock);
442
443 kvfree(ptr);
444
445 spin_lock_irq(&pool->lock);
446 pool->closing = 0;
447 spin_unlock_irq(&pool->lock);
448
449 return 0;
450}
451
452
453/* init new memory pool */
454struct snd_seq_pool *snd_seq_pool_new(int poolsize)
455{
456 struct snd_seq_pool *pool;
457
458 /* create pool block */
459 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
460 if (!pool)
461 return NULL;
462 spin_lock_init(&pool->lock);
463 pool->ptr = NULL;
464 pool->free = NULL;
465 pool->total_elements = 0;
466 atomic_set(&pool->counter, 0);
467 pool->closing = 0;
468 init_waitqueue_head(&pool->output_sleep);
469
470 pool->size = poolsize;
471
472 /* init statistics */
473 pool->max_used = 0;
474 return pool;
475}
476
477/* remove memory pool */
478int snd_seq_pool_delete(struct snd_seq_pool **ppool)
479{
480 struct snd_seq_pool *pool = *ppool;
481
482 *ppool = NULL;
483 if (pool == NULL)
484 return 0;
485 snd_seq_pool_mark_closing(pool);
486 snd_seq_pool_done(pool);
487 kfree(pool);
488 return 0;
489}
490
491/* exported to seq_clientmgr.c */
492void snd_seq_info_pool(struct snd_info_buffer *buffer,
493 struct snd_seq_pool *pool, char *space)
494{
495 if (pool == NULL)
496 return;
497 snd_iprintf(buffer, "%sPool size : %d\n", space, pool->total_elements);
498 snd_iprintf(buffer, "%sCells in use : %d\n", space, atomic_read(&pool->counter));
499 snd_iprintf(buffer, "%sPeak cells in use : %d\n", space, pool->max_used);
500 snd_iprintf(buffer, "%sAlloc success : %d\n", space, pool->event_alloc_success);
501 snd_iprintf(buffer, "%sAlloc failures : %d\n", space, pool->event_alloc_failures);
502}
1/*
2 * ALSA sequencer Memory Manager
3 * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@perex.cz>
5 * 2000 by Takashi Iwai <tiwai@suse.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <linux/init.h>
24#include <linux/export.h>
25#include <linux/slab.h>
26#include <linux/sched/signal.h>
27#include <linux/vmalloc.h>
28#include <sound/core.h>
29
30#include <sound/seq_kernel.h>
31#include "seq_memory.h"
32#include "seq_queue.h"
33#include "seq_info.h"
34#include "seq_lock.h"
35
36static inline int snd_seq_pool_available(struct snd_seq_pool *pool)
37{
38 return pool->total_elements - atomic_read(&pool->counter);
39}
40
41static inline int snd_seq_output_ok(struct snd_seq_pool *pool)
42{
43 return snd_seq_pool_available(pool) >= pool->room;
44}
45
46/*
47 * Variable length event:
48 * The event like sysex uses variable length type.
49 * The external data may be stored in three different formats.
50 * 1) kernel space
51 * This is the normal case.
52 * ext.data.len = length
53 * ext.data.ptr = buffer pointer
54 * 2) user space
55 * When an event is generated via read(), the external data is
56 * kept in user space until expanded.
57 * ext.data.len = length | SNDRV_SEQ_EXT_USRPTR
58 * ext.data.ptr = userspace pointer
59 * 3) chained cells
60 * When the variable length event is enqueued (in prioq or fifo),
61 * the external data is decomposed to several cells.
62 * ext.data.len = length | SNDRV_SEQ_EXT_CHAINED
63 * ext.data.ptr = the additiona cell head
64 * -> cell.next -> cell.next -> ..
65 */
66
67/*
68 * exported:
69 * call dump function to expand external data.
70 */
71
72static int get_var_len(const struct snd_seq_event *event)
73{
74 if ((event->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
75 return -EINVAL;
76
77 return event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
78}
79
80int snd_seq_dump_var_event(const struct snd_seq_event *event,
81 snd_seq_dump_func_t func, void *private_data)
82{
83 int len, err;
84 struct snd_seq_event_cell *cell;
85
86 if ((len = get_var_len(event)) <= 0)
87 return len;
88
89 if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
90 char buf[32];
91 char __user *curptr = (char __force __user *)event->data.ext.ptr;
92 while (len > 0) {
93 int size = sizeof(buf);
94 if (len < size)
95 size = len;
96 if (copy_from_user(buf, curptr, size))
97 return -EFAULT;
98 err = func(private_data, buf, size);
99 if (err < 0)
100 return err;
101 curptr += size;
102 len -= size;
103 }
104 return 0;
105 }
106 if (!(event->data.ext.len & SNDRV_SEQ_EXT_CHAINED))
107 return func(private_data, event->data.ext.ptr, len);
108
109 cell = (struct snd_seq_event_cell *)event->data.ext.ptr;
110 for (; len > 0 && cell; cell = cell->next) {
111 int size = sizeof(struct snd_seq_event);
112 if (len < size)
113 size = len;
114 err = func(private_data, &cell->event, size);
115 if (err < 0)
116 return err;
117 len -= size;
118 }
119 return 0;
120}
121EXPORT_SYMBOL(snd_seq_dump_var_event);
122
123
124/*
125 * exported:
126 * expand the variable length event to linear buffer space.
127 */
128
129static int seq_copy_in_kernel(char **bufptr, const void *src, int size)
130{
131 memcpy(*bufptr, src, size);
132 *bufptr += size;
133 return 0;
134}
135
136static int seq_copy_in_user(char __user **bufptr, const void *src, int size)
137{
138 if (copy_to_user(*bufptr, src, size))
139 return -EFAULT;
140 *bufptr += size;
141 return 0;
142}
143
144int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
145 int in_kernel, int size_aligned)
146{
147 int len, newlen;
148 int err;
149
150 if ((len = get_var_len(event)) < 0)
151 return len;
152 newlen = len;
153 if (size_aligned > 0)
154 newlen = roundup(len, size_aligned);
155 if (count < newlen)
156 return -EAGAIN;
157
158 if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
159 if (! in_kernel)
160 return -EINVAL;
161 if (copy_from_user(buf, (void __force __user *)event->data.ext.ptr, len))
162 return -EFAULT;
163 return newlen;
164 }
165 err = snd_seq_dump_var_event(event,
166 in_kernel ? (snd_seq_dump_func_t)seq_copy_in_kernel :
167 (snd_seq_dump_func_t)seq_copy_in_user,
168 &buf);
169 return err < 0 ? err : newlen;
170}
171EXPORT_SYMBOL(snd_seq_expand_var_event);
172
173/*
174 * release this cell, free extended data if available
175 */
176
177static inline void free_cell(struct snd_seq_pool *pool,
178 struct snd_seq_event_cell *cell)
179{
180 cell->next = pool->free;
181 pool->free = cell;
182 atomic_dec(&pool->counter);
183}
184
185void snd_seq_cell_free(struct snd_seq_event_cell * cell)
186{
187 unsigned long flags;
188 struct snd_seq_pool *pool;
189
190 if (snd_BUG_ON(!cell))
191 return;
192 pool = cell->pool;
193 if (snd_BUG_ON(!pool))
194 return;
195
196 spin_lock_irqsave(&pool->lock, flags);
197 free_cell(pool, cell);
198 if (snd_seq_ev_is_variable(&cell->event)) {
199 if (cell->event.data.ext.len & SNDRV_SEQ_EXT_CHAINED) {
200 struct snd_seq_event_cell *curp, *nextptr;
201 curp = cell->event.data.ext.ptr;
202 for (; curp; curp = nextptr) {
203 nextptr = curp->next;
204 curp->next = pool->free;
205 free_cell(pool, curp);
206 }
207 }
208 }
209 if (waitqueue_active(&pool->output_sleep)) {
210 /* has enough space now? */
211 if (snd_seq_output_ok(pool))
212 wake_up(&pool->output_sleep);
213 }
214 spin_unlock_irqrestore(&pool->lock, flags);
215}
216
217
218/*
219 * allocate an event cell.
220 */
221static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
222 struct snd_seq_event_cell **cellp,
223 int nonblock, struct file *file,
224 struct mutex *mutexp)
225{
226 struct snd_seq_event_cell *cell;
227 unsigned long flags;
228 int err = -EAGAIN;
229 wait_queue_entry_t wait;
230
231 if (pool == NULL)
232 return -EINVAL;
233
234 *cellp = NULL;
235
236 init_waitqueue_entry(&wait, current);
237 spin_lock_irqsave(&pool->lock, flags);
238 if (pool->ptr == NULL) { /* not initialized */
239 pr_debug("ALSA: seq: pool is not initialized\n");
240 err = -EINVAL;
241 goto __error;
242 }
243 while (pool->free == NULL && ! nonblock && ! pool->closing) {
244
245 set_current_state(TASK_INTERRUPTIBLE);
246 add_wait_queue(&pool->output_sleep, &wait);
247 spin_unlock_irq(&pool->lock);
248 if (mutexp)
249 mutex_unlock(mutexp);
250 schedule();
251 if (mutexp)
252 mutex_lock(mutexp);
253 spin_lock_irq(&pool->lock);
254 remove_wait_queue(&pool->output_sleep, &wait);
255 /* interrupted? */
256 if (signal_pending(current)) {
257 err = -ERESTARTSYS;
258 goto __error;
259 }
260 }
261 if (pool->closing) { /* closing.. */
262 err = -ENOMEM;
263 goto __error;
264 }
265
266 cell = pool->free;
267 if (cell) {
268 int used;
269 pool->free = cell->next;
270 atomic_inc(&pool->counter);
271 used = atomic_read(&pool->counter);
272 if (pool->max_used < used)
273 pool->max_used = used;
274 pool->event_alloc_success++;
275 /* clear cell pointers */
276 cell->next = NULL;
277 err = 0;
278 } else
279 pool->event_alloc_failures++;
280 *cellp = cell;
281
282__error:
283 spin_unlock_irqrestore(&pool->lock, flags);
284 return err;
285}
286
287
288/*
289 * duplicate the event to a cell.
290 * if the event has external data, the data is decomposed to additional
291 * cells.
292 */
293int snd_seq_event_dup(struct snd_seq_pool *pool, struct snd_seq_event *event,
294 struct snd_seq_event_cell **cellp, int nonblock,
295 struct file *file, struct mutex *mutexp)
296{
297 int ncells, err;
298 unsigned int extlen;
299 struct snd_seq_event_cell *cell;
300
301 *cellp = NULL;
302
303 ncells = 0;
304 extlen = 0;
305 if (snd_seq_ev_is_variable(event)) {
306 extlen = event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
307 ncells = (extlen + sizeof(struct snd_seq_event) - 1) / sizeof(struct snd_seq_event);
308 }
309 if (ncells >= pool->total_elements)
310 return -ENOMEM;
311
312 err = snd_seq_cell_alloc(pool, &cell, nonblock, file, mutexp);
313 if (err < 0)
314 return err;
315
316 /* copy the event */
317 cell->event = *event;
318
319 /* decompose */
320 if (snd_seq_ev_is_variable(event)) {
321 int len = extlen;
322 int is_chained = event->data.ext.len & SNDRV_SEQ_EXT_CHAINED;
323 int is_usrptr = event->data.ext.len & SNDRV_SEQ_EXT_USRPTR;
324 struct snd_seq_event_cell *src, *tmp, *tail;
325 char *buf;
326
327 cell->event.data.ext.len = extlen | SNDRV_SEQ_EXT_CHAINED;
328 cell->event.data.ext.ptr = NULL;
329
330 src = (struct snd_seq_event_cell *)event->data.ext.ptr;
331 buf = (char *)event->data.ext.ptr;
332 tail = NULL;
333
334 while (ncells-- > 0) {
335 int size = sizeof(struct snd_seq_event);
336 if (len < size)
337 size = len;
338 err = snd_seq_cell_alloc(pool, &tmp, nonblock, file,
339 mutexp);
340 if (err < 0)
341 goto __error;
342 if (cell->event.data.ext.ptr == NULL)
343 cell->event.data.ext.ptr = tmp;
344 if (tail)
345 tail->next = tmp;
346 tail = tmp;
347 /* copy chunk */
348 if (is_chained && src) {
349 tmp->event = src->event;
350 src = src->next;
351 } else if (is_usrptr) {
352 if (copy_from_user(&tmp->event, (char __force __user *)buf, size)) {
353 err = -EFAULT;
354 goto __error;
355 }
356 } else {
357 memcpy(&tmp->event, buf, size);
358 }
359 buf += size;
360 len -= size;
361 }
362 }
363
364 *cellp = cell;
365 return 0;
366
367__error:
368 snd_seq_cell_free(cell);
369 return err;
370}
371
372
373/* poll wait */
374int snd_seq_pool_poll_wait(struct snd_seq_pool *pool, struct file *file,
375 poll_table *wait)
376{
377 poll_wait(file, &pool->output_sleep, wait);
378 return snd_seq_output_ok(pool);
379}
380
381
382/* allocate room specified number of events */
383int snd_seq_pool_init(struct snd_seq_pool *pool)
384{
385 int cell;
386 struct snd_seq_event_cell *cellptr;
387 unsigned long flags;
388
389 if (snd_BUG_ON(!pool))
390 return -EINVAL;
391
392 cellptr = vmalloc(sizeof(struct snd_seq_event_cell) * pool->size);
393 if (!cellptr)
394 return -ENOMEM;
395
396 /* add new cells to the free cell list */
397 spin_lock_irqsave(&pool->lock, flags);
398 if (pool->ptr) {
399 spin_unlock_irqrestore(&pool->lock, flags);
400 vfree(cellptr);
401 return 0;
402 }
403
404 pool->ptr = cellptr;
405 pool->free = NULL;
406
407 for (cell = 0; cell < pool->size; cell++) {
408 cellptr = pool->ptr + cell;
409 cellptr->pool = pool;
410 cellptr->next = pool->free;
411 pool->free = cellptr;
412 }
413 pool->room = (pool->size + 1) / 2;
414
415 /* init statistics */
416 pool->max_used = 0;
417 pool->total_elements = pool->size;
418 spin_unlock_irqrestore(&pool->lock, flags);
419 return 0;
420}
421
422/* refuse the further insertion to the pool */
423void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
424{
425 unsigned long flags;
426
427 if (snd_BUG_ON(!pool))
428 return;
429 spin_lock_irqsave(&pool->lock, flags);
430 pool->closing = 1;
431 spin_unlock_irqrestore(&pool->lock, flags);
432}
433
434/* remove events */
435int snd_seq_pool_done(struct snd_seq_pool *pool)
436{
437 unsigned long flags;
438 struct snd_seq_event_cell *ptr;
439
440 if (snd_BUG_ON(!pool))
441 return -EINVAL;
442
443 /* wait for closing all threads */
444 if (waitqueue_active(&pool->output_sleep))
445 wake_up(&pool->output_sleep);
446
447 while (atomic_read(&pool->counter) > 0)
448 schedule_timeout_uninterruptible(1);
449
450 /* release all resources */
451 spin_lock_irqsave(&pool->lock, flags);
452 ptr = pool->ptr;
453 pool->ptr = NULL;
454 pool->free = NULL;
455 pool->total_elements = 0;
456 spin_unlock_irqrestore(&pool->lock, flags);
457
458 vfree(ptr);
459
460 spin_lock_irqsave(&pool->lock, flags);
461 pool->closing = 0;
462 spin_unlock_irqrestore(&pool->lock, flags);
463
464 return 0;
465}
466
467
468/* init new memory pool */
469struct snd_seq_pool *snd_seq_pool_new(int poolsize)
470{
471 struct snd_seq_pool *pool;
472
473 /* create pool block */
474 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
475 if (!pool)
476 return NULL;
477 spin_lock_init(&pool->lock);
478 pool->ptr = NULL;
479 pool->free = NULL;
480 pool->total_elements = 0;
481 atomic_set(&pool->counter, 0);
482 pool->closing = 0;
483 init_waitqueue_head(&pool->output_sleep);
484
485 pool->size = poolsize;
486
487 /* init statistics */
488 pool->max_used = 0;
489 return pool;
490}
491
492/* remove memory pool */
493int snd_seq_pool_delete(struct snd_seq_pool **ppool)
494{
495 struct snd_seq_pool *pool = *ppool;
496
497 *ppool = NULL;
498 if (pool == NULL)
499 return 0;
500 snd_seq_pool_mark_closing(pool);
501 snd_seq_pool_done(pool);
502 kfree(pool);
503 return 0;
504}
505
506/* initialize sequencer memory */
507int __init snd_sequencer_memory_init(void)
508{
509 return 0;
510}
511
512/* release sequencer memory */
513void __exit snd_sequencer_memory_done(void)
514{
515}
516
517
518/* exported to seq_clientmgr.c */
519void snd_seq_info_pool(struct snd_info_buffer *buffer,
520 struct snd_seq_pool *pool, char *space)
521{
522 if (pool == NULL)
523 return;
524 snd_iprintf(buffer, "%sPool size : %d\n", space, pool->total_elements);
525 snd_iprintf(buffer, "%sCells in use : %d\n", space, atomic_read(&pool->counter));
526 snd_iprintf(buffer, "%sPeak cells in use : %d\n", space, pool->max_used);
527 snd_iprintf(buffer, "%sAlloc success : %d\n", space, pool->event_alloc_success);
528 snd_iprintf(buffer, "%sAlloc failures : %d\n", space, pool->event_alloc_failures);
529}