diff options
Diffstat (limited to 'sound/core/pcm_memory.c')
| -rw-r--r-- | sound/core/pcm_memory.c | 122 |
1 files changed, 87 insertions, 35 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index ff07b4a9992..54debc07f5c 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -22,7 +22,10 @@ #include <asm/io.h> #include <linux/time.h> #include <linux/init.h> +#include <linux/slab.h> #include <linux/moduleparam.h> +#include <linux/vmalloc.h> +#include <linux/export.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/info.h> @@ -48,19 +51,9 @@ static const size_t snd_minimum_buffer = 16384; static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) { struct snd_dma_buffer *dmab = &substream->dma_buffer; + size_t orig_size = size; int err; - snd_assert(size > 0, return -EINVAL); - - /* already reserved? */ - if (snd_dma_get_reserved_buf(dmab, substream->dma_buf_id) > 0) { - if (dmab->bytes >= size) - return 0; /* yes */ - /* no, free the reserved block */ - snd_dma_free_pages(dmab); - dmab->bytes = 0; - } - do { if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, size, dmab)) < 0) { @@ -71,6 +64,10 @@ static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t siz size >>= 1; } while (size >= snd_minimum_buffer); dmab->bytes = 0; /* tell error */ + pr_warn("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, orig_size); return 0; } @@ -81,10 +78,7 @@ static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream { if (substream->dma_buffer.area == NULL) return; - if (substream->dma_buf_id) - snd_dma_reserve_buf(&substream->dma_buffer, substream->dma_buf_id); - else - snd_dma_free_pages(&substream->dma_buffer); + snd_dma_free_pages(&substream->dma_buffer); substream->dma_buffer.area = NULL; } @@ -94,7 +88,7 @@ static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream * * Releases the pre-allocated buffer of the given substream. * - * Returns zero if successful, or a negative error code on failure. + * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) { @@ -114,7 +108,7 @@ int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) * * Releases all the pre-allocated buffers on the given pcm. * - * Returns zero if successful, or a negative error code on failure. + * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) { @@ -253,18 +247,13 @@ static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream, * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type * @substream: the pcm substream instance * @type: DMA type (SNDRV_DMA_TYPE_*) - * @data: DMA type dependant data + * @data: DMA type dependent data * @size: the requested pre-allocation size in bytes * @max: the max. allowed pre-allocation size * * Do pre-allocation for the given DMA buffer type. * - * When substream->dma_buf_id is set, the function tries to look for - * the reserved buffer, and the buffer is not freed but reserved at - * destruction time. The dma_buf_id must be unique for all systems - * (in the same DMA buffer type) e.g. using snd_dma_pci_buf_id(). - * - * Returns zero if successful, or a negative error code on failure. + * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, int type, struct device *data, @@ -278,17 +267,17 @@ int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); /** - * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continous memory type (all substreams) + * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams) * @pcm: the pcm instance * @type: DMA type (SNDRV_DMA_TYPE_*) - * @data: DMA type dependant data + * @data: DMA type dependent data * @size: the requested pre-allocation size in bytes * @max: the max. allowed pre-allocation size * * Do pre-allocation to all substreams of the given pcm for the * specified DMA type. * - * Returns zero if successful, or a negative error code on failure. + * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, int type, void *data, @@ -306,13 +295,15 @@ int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_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 * - * Returns the page struct at the given buffer offset. * Used as the page callback of PCM ops. + * + * Return: The page struct at the given buffer offset. %NULL on failure. */ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset) { @@ -325,6 +316,7 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne } EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); +#endif /* CONFIG_SND_DMA_SGBUF */ /** * snd_pcm_lib_malloc_pages - allocate the DMA buffer @@ -334,7 +326,7 @@ EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); * Allocates the DMA buffer on the BUS type given earlier to * snd_pcm_lib_preallocate_xxx_pages(). * - * Returns 1 if the buffer is changed, 0 if not changed, or a negative + * Return: 1 if the buffer is changed, 0 if not changed, or a negative * code on failure. */ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) @@ -342,10 +334,12 @@ int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) struct snd_pcm_runtime *runtime; struct snd_dma_buffer *dmab = NULL; - snd_assert(substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_UNKNOWN, return -EINVAL); - snd_assert(substream != NULL, return -EINVAL); + if (PCM_RUNTIME_CHECK(substream)) + return -EINVAL; + if (snd_BUG_ON(substream->dma_buffer.dev.type == + SNDRV_DMA_TYPE_UNKNOWN)) + return -EINVAL; runtime = substream->runtime; - snd_assert(runtime != NULL, return -EINVAL); if (runtime->dma_buffer_p) { /* perphaps, we might free the large DMA memory region @@ -385,15 +379,15 @@ EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); * * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages(). * - * Returns zero if successful, or a negative error code on failure. + * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime; - snd_assert(substream != NULL, return -EINVAL); + if (PCM_RUNTIME_CHECK(substream)) + return -EINVAL; runtime = substream->runtime; - snd_assert(runtime != NULL, return -EINVAL); if (runtime->dma_area == NULL) return 0; if (runtime->dma_buffer_p != &substream->dma_buffer) { @@ -406,3 +400,61 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) } EXPORT_SYMBOL(snd_pcm_lib_free_pages); + +int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, + size_t size, gfp_t gfp_flags) +{ + struct snd_pcm_runtime *runtime; + + if (PCM_RUNTIME_CHECK(substream)) + return -EINVAL; + runtime = substream->runtime; + if (runtime->dma_area) { + if (runtime->dma_bytes >= size) + return 0; /* already large enough */ + vfree(runtime->dma_area); + } + runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL); + if (!runtime->dma_area) + return -ENOMEM; + runtime->dma_bytes = size; + return 1; +} +EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer); + +/** + * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer + * @substream: the substream with a buffer allocated by + * snd_pcm_lib_alloc_vmalloc_buffer() + * + * Return: Zero if successful, or a negative error code on failure. + */ +int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime; + + if (PCM_RUNTIME_CHECK(substream)) + return -EINVAL; + runtime = substream->runtime; + vfree(runtime->dma_area); + runtime->dma_area = NULL; + return 0; +} +EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer); + +/** + * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct + * @substream: the substream with a buffer allocated by + * snd_pcm_lib_alloc_vmalloc_buffer() + * @offset: offset in the buffer + * + * This function is to be used as the page callback in the PCM ops. + * + * Return: The page struct, or %NULL on failure. + */ +struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, + unsigned long offset) +{ + return vmalloc_to_page(substream->runtime->dma_area + offset); +} +EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page); |