3  *  Digital Audio (PCM) abstract layer
15 #include <sound/pcm.h>
22 MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized.");
107 	struct snd_card *card = substream->pcm->card;  in preallocate_pcm_pages()
122 		substream->pcm->card->number, substream->pcm->device,  in preallocate_pcm_pages()
124 		substream->pcm->name, orig_size);  in preallocate_pcm_pages()
130  * @substream: the pcm substream instance
136 	do_free_pages(substream->pcm->card, &substream->dma_buffer);  in snd_pcm_lib_preallocate_free()
140  * snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm
141  * @pcm: the pcm instance
143  * Releases all the pre-allocated buffers on the given pcm.
145 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)  in snd_pcm_lib_preallocate_free_for_all()  argument
150 	for_each_pcm_substream(pcm, stream, substream)  in snd_pcm_lib_preallocate_free_for_all()
189 	struct snd_card *card = substream->pcm->card;  in snd_pcm_lib_preallocate_proc_write()
194 	mutex_lock(&substream->pcm->open_mutex);  in snd_pcm_lib_preallocate_proc_write()
218 					 substream->pcm->card->number, substream->pcm->device,  in snd_pcm_lib_preallocate_proc_write()
220 					 substream->pcm->name, size);  in snd_pcm_lib_preallocate_proc_write()
234 	mutex_unlock(&substream->pcm->open_mutex);  in snd_pcm_lib_preallocate_proc_write()
241 	entry = snd_info_create_card_entry(substream->pcm->card, "prealloc",  in preallocate_info_init()
249 	entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max",  in preallocate_info_init()
301 static int preallocate_pages_for_all(struct snd_pcm *pcm, int type,  in preallocate_pages_for_all()  argument
308 	for_each_pcm_substream(pcm, stream, substream) {  in preallocate_pages_for_all()
318  * @substream: the pcm substream instance
336  * @pcm: the pcm instance
342  * Do pre-allocation to all substreams of the given pcm for the
345 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,  in snd_pcm_lib_preallocate_pages_for_all()  argument
349 	preallocate_pages_for_all(pcm, type, data, size, max, false);  in snd_pcm_lib_preallocate_pages_for_all()
355  * @substream: the pcm substream instance
363  * In this mode, PCM core will allocate a buffer automatically before PCM
364  * hw_params ops call, and release the buffer after PCM hw_free ops call
367  * When a buffer is actually allocated before the PCM hw_params call, it
394  * @pcm: the pcm instance
400  * Do pre-allocation to all substreams of the given pcm for the specified DMA
405 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,  in snd_pcm_set_managed_buffer_all()  argument
409 	return preallocate_pages_for_all(pcm, type, data, size, max, true);  in snd_pcm_set_managed_buffer_all()
436 	card = substream->pcm->card;  in snd_pcm_lib_malloc_pages()
466 				 substream->pcm->card->number, substream->pcm->device,  in snd_pcm_lib_malloc_pages()
468 				 substream->pcm->name, size);  in snd_pcm_lib_malloc_pages()
496 		struct snd_card *card = substream->pcm->card;  in snd_pcm_lib_free_pages()
554  * This function is to be used as the page callback in the PCM ops.