diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/core/pcm_memory.c | 155 |
1 files changed, 92 insertions, 63 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index fcab37ea6641..7bde7fb64011 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -32,14 +32,20 @@ module_param(max_alloc_per_card, ulong, 0644); MODULE_PARM_DESC(max_alloc_per_card, "Max total allocation bytes per card."); static int do_alloc_pages(struct snd_card *card, int type, struct device *dev, - size_t size, struct snd_dma_buffer *dmab) + int str, size_t size, struct snd_dma_buffer *dmab) { + enum dma_data_direction dir; int err; if (max_alloc_per_card && card->total_pcm_alloc_bytes + size > max_alloc_per_card) return -ENOMEM; - err = snd_dma_alloc_pages(type, dev, size, dmab); + + if (str == SNDRV_PCM_STREAM_PLAYBACK) + dir = DMA_TO_DEVICE; + else + dir = DMA_FROM_DEVICE; + err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab); if (!err) { mutex_lock(&card->memory_mutex); card->total_pcm_alloc_bytes += dmab->bytes; @@ -66,7 +72,8 @@ static void do_free_pages(struct snd_card *card, struct snd_dma_buffer *dmab) * * the minimum size is snd_minimum_buffer. it should be power of 2. */ -static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) +static int preallocate_pcm_pages(struct snd_pcm_substream *substream, + size_t size, bool no_fallback) { struct snd_dma_buffer *dmab = &substream->dma_buffer; struct snd_card *card = substream->pcm->card; @@ -75,9 +82,11 @@ static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t siz do { err = do_alloc_pages(card, dmab->dev.type, dmab->dev.dev, - size, dmab); + substream->stream, size, dmab); if (err != -ENOMEM) return err; + if (no_fallback) + break; size >>= 1; } while (size >= snd_minimum_buffer); dmab->bytes = 0; /* tell error */ @@ -85,15 +94,7 @@ static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t siz substream->pcm->card->number, substream->pcm->device, substream->stream ? 'c' : 'p', substream->number, substream->pcm->name, orig_size); - return 0; -} - -/* - * release the preallocated buffer if not yet done. - */ -static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream) -{ - do_free_pages(substream->pcm->card, &substream->dma_buffer); + return -ENOMEM; } /** @@ -104,7 +105,7 @@ static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream */ void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) { - snd_pcm_lib_preallocate_dma_free(substream); + do_free_pages(substream->pcm->card, &substream->dma_buffer); } /** @@ -118,9 +119,8 @@ void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) struct snd_pcm_substream *substream; int stream; - for (stream = 0; stream < 2; stream++) - for (substream = pcm->streams[stream].substream; substream; substream = substream->next) - snd_pcm_lib_preallocate_free(substream); + for_each_pcm_substream(pcm, stream, substream) + snd_pcm_lib_preallocate_free(substream); } EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); @@ -163,28 +163,34 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, size_t size; struct snd_dma_buffer new_dmab; + mutex_lock(&substream->pcm->open_mutex); if (substream->runtime) { buffer->error = -EBUSY; - return; + goto unlock; } if (!snd_info_get_line(buffer, line, sizeof(line))) { snd_info_get_str(str, line, sizeof(str)); size = simple_strtoul(str, NULL, 10) * 1024; if ((size != 0 && size < 8192) || size > substream->dma_max) { buffer->error = -EINVAL; - return; + goto unlock; } if (substream->dma_buffer.bytes == size) - return; + goto unlock; memset(&new_dmab, 0, sizeof(new_dmab)); new_dmab.dev = substream->dma_buffer.dev; if (size > 0) { if (do_alloc_pages(card, substream->dma_buffer.dev.type, substream->dma_buffer.dev.dev, + substream->stream, size, &new_dmab) < 0) { buffer->error = -ENOMEM; - return; + pr_debug("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", + substream->pcm->card->number, substream->pcm->device, + substream->stream ? 'c' : 'p', substream->number, + substream->pcm->name, size); + goto unlock; } substream->buffer_bytes_max = size; } else { @@ -196,6 +202,8 @@ static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, } else { buffer->error = -EINVAL; } + unlock: + mutex_unlock(&substream->pcm->open_mutex); } static inline void preallocate_info_init(struct snd_pcm_substream *substream) @@ -218,24 +226,39 @@ static inline void preallocate_info_init(struct snd_pcm_substream *substream) } #else /* !CONFIG_SND_VERBOSE_PROCFS */ -#define preallocate_info_init(s) +static inline void preallocate_info_init(struct snd_pcm_substream *substream) +{ +} #endif /* CONFIG_SND_VERBOSE_PROCFS */ /* * pre-allocate the buffer and create a proc file for the substream */ -static void preallocate_pages(struct snd_pcm_substream *substream, +static int preallocate_pages(struct snd_pcm_substream *substream, int type, struct device *data, size_t size, size_t max, bool managed) { + int err; + if (snd_BUG_ON(substream->dma_buffer.dev.type)) - return; + return -EINVAL; substream->dma_buffer.dev.type = type; substream->dma_buffer.dev.dev = data; - if (size > 0 && preallocate_dma && substream->number < maximum_substreams) - preallocate_pcm_pages(substream, size); + if (size > 0) { + if (!max) { + /* no fallback, only also inform -ENOMEM */ + err = preallocate_pcm_pages(substream, size, true); + if (err < 0) + return err; + } else if (preallocate_dma && + substream->number < maximum_substreams) { + err = preallocate_pcm_pages(substream, size, false); + if (err < 0 && err != -ENOMEM) + return err; + } + } if (substream->dma_buffer.bytes > 0) substream->buffer_bytes_max = substream->dma_buffer.bytes; @@ -244,20 +267,22 @@ static void preallocate_pages(struct snd_pcm_substream *substream, preallocate_info_init(substream); if (managed) substream->managed_buffer_alloc = 1; + return 0; } -static void preallocate_pages_for_all(struct snd_pcm *pcm, int type, +static int preallocate_pages_for_all(struct snd_pcm *pcm, int type, void *data, size_t size, size_t max, bool managed) { struct snd_pcm_substream *substream; - int stream; + int stream, err; - for (stream = 0; stream < 2; stream++) - for (substream = pcm->streams[stream].substream; substream; - substream = substream->next) - preallocate_pages(substream, type, data, size, max, - managed); + for_each_pcm_substream(pcm, stream, substream) { + err = preallocate_pages(substream, type, data, size, max, managed); + if (err < 0) + return err; + } + return 0; } /** @@ -314,11 +339,24 @@ EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); * When a buffer is actually allocated before the PCM hw_params call, it * turns on the runtime buffer_changed flag for drivers changing their h/w * parameters accordingly. + * + * When @size is non-zero and @max is zero, this tries to allocate for only + * the exact buffer size without fallback, and may return -ENOMEM. + * Otherwise, the function tries to allocate smaller chunks if the allocation + * fails. This is the behavior of snd_pcm_set_fixed_buffer(). + * + * When both @size and @max are zero, the function only sets up the buffer + * for later dynamic allocations. It's used typically for buffers with + * SNDRV_DMA_TYPE_VMALLOC type. + * + * Upon successful buffer allocation and setup, the function returns 0. + * + * Return: zero if successful, or a negative error code */ -void snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, +int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, struct device *data, size_t size, size_t max) { - preallocate_pages(substream, type, data, size, max, true); + return preallocate_pages(substream, type, data, size, max, true); } EXPORT_SYMBOL(snd_pcm_set_managed_buffer); @@ -333,35 +371,16 @@ EXPORT_SYMBOL(snd_pcm_set_managed_buffer); * * Do pre-allocation to all substreams of the given pcm for the specified DMA * type and size, and set the managed_buffer_alloc flag to each substream. - */ -void snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, - struct device *data, - size_t size, size_t max) -{ - preallocate_pages_for_all(pcm, type, data, size, max, true); -} -EXPORT_SYMBOL(snd_pcm_set_managed_buffer_all); - -#ifdef CONFIG_SND_DMA_SGBUF -/* - * snd_pcm_sgbuf_ops_page - get the page struct at the given offset - * @substream: the pcm substream instance - * @offset: the buffer offset * - * Used as the page callback of PCM ops. - * - * Return: The page struct at the given buffer offset. %NULL on failure. + * Return: zero if successful, or a negative error code */ -struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset) +int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, + struct device *data, + size_t size, size_t max) { - struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); - - unsigned int idx = offset >> PAGE_SHIFT; - if (idx >= (unsigned int)sgbuf->pages) - return NULL; - return sgbuf->page_table[idx]; + return preallocate_pages_for_all(pcm, type, data, size, max, true); } -#endif /* CONFIG_SND_DMA_SGBUF */ +EXPORT_SYMBOL(snd_pcm_set_managed_buffer_all); /** * snd_pcm_lib_malloc_pages - allocate the DMA buffer @@ -376,7 +395,7 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne */ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) { - struct snd_card *card = substream->pcm->card; + struct snd_card *card; struct snd_pcm_runtime *runtime; struct snd_dma_buffer *dmab = NULL; @@ -386,6 +405,7 @@ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) SNDRV_DMA_TYPE_UNKNOWN)) return -EINVAL; runtime = substream->runtime; + card = substream->pcm->card; if (runtime->dma_buffer_p) { /* perphaps, we might free the large DMA memory region @@ -401,6 +421,9 @@ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) substream->dma_buffer.bytes >= size) { dmab = &substream->dma_buffer; /* use the pre-allocated buffer */ } else { + /* dma_max=0 means the fixed size preallocation */ + if (substream->dma_buffer.area && !substream->dma_max) + return -ENOMEM; dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); if (! dmab) return -ENOMEM; @@ -408,8 +431,13 @@ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) if (do_alloc_pages(card, substream->dma_buffer.dev.type, substream->dma_buffer.dev.dev, + substream->stream, size, dmab) < 0) { kfree(dmab); + pr_debug("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", + substream->pcm->card->number, substream->pcm->device, + substream->stream ? 'c' : 'p', substream->number, + substream->pcm->name, size); return -ENOMEM; } } @@ -429,7 +457,6 @@ EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); */ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) { - struct snd_card *card = substream->pcm->card; struct snd_pcm_runtime *runtime; if (PCM_RUNTIME_CHECK(substream)) @@ -438,6 +465,8 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) if (runtime->dma_area == NULL) return 0; if (runtime->dma_buffer_p != &substream->dma_buffer) { + struct snd_card *card = substream->pcm->card; + /* it's a newly allocated buffer. release it now. */ do_free_pages(card, runtime->dma_buffer_p); kfree(runtime->dma_buffer_p); @@ -460,7 +489,7 @@ int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, return 0; /* already large enough */ vfree(runtime->dma_area); } - runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL); + runtime->dma_area = __vmalloc(size, gfp_flags); if (!runtime->dma_area) return -ENOMEM; runtime->dma_bytes = size; |