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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// 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 len = get_var_len(event);
73 if (len <= 0)
74 return len;
75
76 if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
77 char buf[32];
78 char __user *curptr = (char __force __user *)event->data.ext.ptr;
79 while (len > 0) {
80 int size = sizeof(buf);
81 if (len < size)
82 size = len;
83 if (copy_from_user(buf, curptr, size))
84 return -EFAULT;
85 err = func(private_data, buf, size);
86 if (err < 0)
87 return err;
88 curptr += size;
89 len -= size;
90 }
91 return 0;
92 }
93 if (!(event->data.ext.len & SNDRV_SEQ_EXT_CHAINED))
94 return func(private_data, event->data.ext.ptr, len);
95
96 cell = (struct snd_seq_event_cell *)event->data.ext.ptr;
97 for (; len > 0 && cell; cell = cell->next) {
98 int size = sizeof(struct snd_seq_event);
99 if (len < size)
100 size = len;
101 err = func(private_data, &cell->event, size);
102 if (err < 0)
103 return err;
104 len -= size;
105 }
106 return 0;
107}
108EXPORT_SYMBOL(snd_seq_dump_var_event);
109
110
111/*
112 * exported:
113 * expand the variable length event to linear buffer space.
114 */
115
116static int seq_copy_in_kernel(void *ptr, void *src, int size)
117{
118 char **bufptr = ptr;
119
120 memcpy(*bufptr, src, size);
121 *bufptr += size;
122 return 0;
123}
124
125static int seq_copy_in_user(void *ptr, void *src, int size)
126{
127 char __user **bufptr = ptr;
128
129 if (copy_to_user(*bufptr, src, size))
130 return -EFAULT;
131 *bufptr += size;
132 return 0;
133}
134
135int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
136 int in_kernel, int size_aligned)
137{
138 int len, newlen;
139 int err;
140
141 len = get_var_len(event);
142 if (len < 0)
143 return len;
144 newlen = len;
145 if (size_aligned > 0)
146 newlen = roundup(len, size_aligned);
147 if (count < newlen)
148 return -EAGAIN;
149
150 if (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR) {
151 if (! in_kernel)
152 return -EINVAL;
153 if (copy_from_user(buf, (void __force __user *)event->data.ext.ptr, len))
154 return -EFAULT;
155 return newlen;
156 }
157 err = snd_seq_dump_var_event(event,
158 in_kernel ? seq_copy_in_kernel : seq_copy_in_user,
159 &buf);
160 return err < 0 ? err : newlen;
161}
162EXPORT_SYMBOL(snd_seq_expand_var_event);
163
164/*
165 * release this cell, free extended data if available
166 */
167
168static inline void free_cell(struct snd_seq_pool *pool,
169 struct snd_seq_event_cell *cell)
170{
171 cell->next = pool->free;
172 pool->free = cell;
173 atomic_dec(&pool->counter);
174}
175
176void snd_seq_cell_free(struct snd_seq_event_cell * cell)
177{
178 unsigned long flags;
179 struct snd_seq_pool *pool;
180
181 if (snd_BUG_ON(!cell))
182 return;
183 pool = cell->pool;
184 if (snd_BUG_ON(!pool))
185 return;
186
187 spin_lock_irqsave(&pool->lock, flags);
188 free_cell(pool, cell);
189 if (snd_seq_ev_is_variable(&cell->event)) {
190 if (cell->event.data.ext.len & SNDRV_SEQ_EXT_CHAINED) {
191 struct snd_seq_event_cell *curp, *nextptr;
192 curp = cell->event.data.ext.ptr;
193 for (; curp; curp = nextptr) {
194 nextptr = curp->next;
195 curp->next = pool->free;
196 free_cell(pool, curp);
197 }
198 }
199 }
200 if (waitqueue_active(&pool->output_sleep)) {
201 /* has enough space now? */
202 if (snd_seq_output_ok(pool))
203 wake_up(&pool->output_sleep);
204 }
205 spin_unlock_irqrestore(&pool->lock, flags);
206}
207
208
209/*
210 * allocate an event cell.
211 */
212static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
213 struct snd_seq_event_cell **cellp,
214 int nonblock, struct file *file,
215 struct mutex *mutexp)
216{
217 struct snd_seq_event_cell *cell;
218 unsigned long flags;
219 int err = -EAGAIN;
220 wait_queue_entry_t wait;
221
222 if (pool == NULL)
223 return -EINVAL;
224
225 *cellp = NULL;
226
227 init_waitqueue_entry(&wait, current);
228 spin_lock_irqsave(&pool->lock, flags);
229 if (pool->ptr == NULL) { /* not initialized */
230 pr_debug("ALSA: seq: pool is not initialized\n");
231 err = -EINVAL;
232 goto __error;
233 }
234 while (pool->free == NULL && ! nonblock && ! pool->closing) {
235
236 set_current_state(TASK_INTERRUPTIBLE);
237 add_wait_queue(&pool->output_sleep, &wait);
238 spin_unlock_irqrestore(&pool->lock, flags);
239 if (mutexp)
240 mutex_unlock(mutexp);
241 schedule();
242 if (mutexp)
243 mutex_lock(mutexp);
244 spin_lock_irqsave(&pool->lock, flags);
245 remove_wait_queue(&pool->output_sleep, &wait);
246 /* interrupted? */
247 if (signal_pending(current)) {
248 err = -ERESTARTSYS;
249 goto __error;
250 }
251 }
252 if (pool->closing) { /* closing.. */
253 err = -ENOMEM;
254 goto __error;
255 }
256
257 cell = pool->free;
258 if (cell) {
259 int used;
260 pool->free = cell->next;
261 atomic_inc(&pool->counter);
262 used = atomic_read(&pool->counter);
263 if (pool->max_used < used)
264 pool->max_used = used;
265 pool->event_alloc_success++;
266 /* clear cell pointers */
267 cell->next = NULL;
268 err = 0;
269 } else
270 pool->event_alloc_failures++;
271 *cellp = cell;
272
273__error:
274 spin_unlock_irqrestore(&pool->lock, flags);
275 return err;
276}
277
278
279/*
280 * duplicate the event to a cell.
281 * if the event has external data, the data is decomposed to additional
282 * cells.
283 */
284int snd_seq_event_dup(struct snd_seq_pool *pool, struct snd_seq_event *event,
285 struct snd_seq_event_cell **cellp, int nonblock,
286 struct file *file, struct mutex *mutexp)
287{
288 int ncells, err;
289 unsigned int extlen;
290 struct snd_seq_event_cell *cell;
291
292 *cellp = NULL;
293
294 ncells = 0;
295 extlen = 0;
296 if (snd_seq_ev_is_variable(event)) {
297 extlen = event->data.ext.len & ~SNDRV_SEQ_EXT_MASK;
298 ncells = DIV_ROUND_UP(extlen, sizeof(struct snd_seq_event));
299 }
300 if (ncells >= pool->total_elements)
301 return -ENOMEM;
302
303 err = snd_seq_cell_alloc(pool, &cell, nonblock, file, mutexp);
304 if (err < 0)
305 return err;
306
307 /* copy the event */
308 cell->event = *event;
309
310 /* decompose */
311 if (snd_seq_ev_is_variable(event)) {
312 int len = extlen;
313 int is_chained = event->data.ext.len & SNDRV_SEQ_EXT_CHAINED;
314 int is_usrptr = event->data.ext.len & SNDRV_SEQ_EXT_USRPTR;
315 struct snd_seq_event_cell *src, *tmp, *tail;
316 char *buf;
317
318 cell->event.data.ext.len = extlen | SNDRV_SEQ_EXT_CHAINED;
319 cell->event.data.ext.ptr = NULL;
320
321 src = (struct snd_seq_event_cell *)event->data.ext.ptr;
322 buf = (char *)event->data.ext.ptr;
323 tail = NULL;
324
325 while (ncells-- > 0) {
326 int size = sizeof(struct snd_seq_event);
327 if (len < size)
328 size = len;
329 err = snd_seq_cell_alloc(pool, &tmp, nonblock, file,
330 mutexp);
331 if (err < 0)
332 goto __error;
333 if (cell->event.data.ext.ptr == NULL)
334 cell->event.data.ext.ptr = tmp;
335 if (tail)
336 tail->next = tmp;
337 tail = tmp;
338 /* copy chunk */
339 if (is_chained && src) {
340 tmp->event = src->event;
341 src = src->next;
342 } else if (is_usrptr) {
343 if (copy_from_user(&tmp->event, (char __force __user *)buf, size)) {
344 err = -EFAULT;
345 goto __error;
346 }
347 } else {
348 memcpy(&tmp->event, buf, size);
349 }
350 buf += size;
351 len -= size;
352 }
353 }
354
355 *cellp = cell;
356 return 0;
357
358__error:
359 snd_seq_cell_free(cell);
360 return err;
361}
362
363
364/* poll wait */
365int snd_seq_pool_poll_wait(struct snd_seq_pool *pool, struct file *file,
366 poll_table *wait)
367{
368 poll_wait(file, &pool->output_sleep, wait);
369 return snd_seq_output_ok(pool);
370}
371
372
373/* allocate room specified number of events */
374int snd_seq_pool_init(struct snd_seq_pool *pool)
375{
376 int cell;
377 struct snd_seq_event_cell *cellptr;
378
379 if (snd_BUG_ON(!pool))
380 return -EINVAL;
381
382 cellptr = kvmalloc_array(sizeof(struct snd_seq_event_cell), pool->size,
383 GFP_KERNEL);
384 if (!cellptr)
385 return -ENOMEM;
386
387 /* add new cells to the free cell list */
388 spin_lock_irq(&pool->lock);
389 if (pool->ptr) {
390 spin_unlock_irq(&pool->lock);
391 kvfree(cellptr);
392 return 0;
393 }
394
395 pool->ptr = cellptr;
396 pool->free = NULL;
397
398 for (cell = 0; cell < pool->size; cell++) {
399 cellptr = pool->ptr + cell;
400 cellptr->pool = pool;
401 cellptr->next = pool->free;
402 pool->free = cellptr;
403 }
404 pool->room = (pool->size + 1) / 2;
405
406 /* init statistics */
407 pool->max_used = 0;
408 pool->total_elements = pool->size;
409 spin_unlock_irq(&pool->lock);
410 return 0;
411}
412
413/* refuse the further insertion to the pool */
414void snd_seq_pool_mark_closing(struct snd_seq_pool *pool)
415{
416 unsigned long flags;
417
418 if (snd_BUG_ON(!pool))
419 return;
420 spin_lock_irqsave(&pool->lock, flags);
421 pool->closing = 1;
422 spin_unlock_irqrestore(&pool->lock, flags);
423}
424
425/* remove events */
426int snd_seq_pool_done(struct snd_seq_pool *pool)
427{
428 struct snd_seq_event_cell *ptr;
429
430 if (snd_BUG_ON(!pool))
431 return -EINVAL;
432
433 /* wait for closing all threads */
434 if (waitqueue_active(&pool->output_sleep))
435 wake_up(&pool->output_sleep);
436
437 while (atomic_read(&pool->counter) > 0)
438 schedule_timeout_uninterruptible(1);
439
440 /* release all resources */
441 spin_lock_irq(&pool->lock);
442 ptr = pool->ptr;
443 pool->ptr = NULL;
444 pool->free = NULL;
445 pool->total_elements = 0;
446 spin_unlock_irq(&pool->lock);
447
448 kvfree(ptr);
449
450 spin_lock_irq(&pool->lock);
451 pool->closing = 0;
452 spin_unlock_irq(&pool->lock);
453
454 return 0;
455}
456
457
458/* init new memory pool */
459struct snd_seq_pool *snd_seq_pool_new(int poolsize)
460{
461 struct snd_seq_pool *pool;
462
463 /* create pool block */
464 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
465 if (!pool)
466 return NULL;
467 spin_lock_init(&pool->lock);
468 pool->ptr = NULL;
469 pool->free = NULL;
470 pool->total_elements = 0;
471 atomic_set(&pool->counter, 0);
472 pool->closing = 0;
473 init_waitqueue_head(&pool->output_sleep);
474
475 pool->size = poolsize;
476
477 /* init statistics */
478 pool->max_used = 0;
479 return pool;
480}
481
482/* remove memory pool */
483int snd_seq_pool_delete(struct snd_seq_pool **ppool)
484{
485 struct snd_seq_pool *pool = *ppool;
486
487 *ppool = NULL;
488 if (pool == NULL)
489 return 0;
490 snd_seq_pool_mark_closing(pool);
491 snd_seq_pool_done(pool);
492 kfree(pool);
493 return 0;
494}
495
496/* exported to seq_clientmgr.c */
497void snd_seq_info_pool(struct snd_info_buffer *buffer,
498 struct snd_seq_pool *pool, char *space)
499{
500 if (pool == NULL)
501 return;
502 snd_iprintf(buffer, "%sPool size : %d\n", space, pool->total_elements);
503 snd_iprintf(buffer, "%sCells in use : %d\n", space, atomic_read(&pool->counter));
504 snd_iprintf(buffer, "%sPeak cells in use : %d\n", space, pool->max_used);
505 snd_iprintf(buffer, "%sAlloc success : %d\n", space, pool->event_alloc_success);
506 snd_iprintf(buffer, "%sAlloc failures : %d\n", space, pool->event_alloc_failures);
507}