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authorClemens Ladisch <clemens@ladisch.de>2009-12-18 09:29:00 +0100
committerTakashi Iwai <tiwai@suse.de>2009-12-18 12:54:01 +0100
commit681b84e17747e1c208e8e1acc54cc5e612da84d1 (patch)
treef82316d8038b17711bdfbfb4e9ea7f2d76b5a9fc /include/sound
parent14d44e2c2cb2ef3c88c5090a2d419772e15e7a16 (diff)
sound: pcm: add vmalloc buffer helper functions
There are now five copies of the code to allocate a PCM buffer using vmalloc(). Add a sixth in the core so that the others can be removed. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/pcm.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index c83a4a79f16..0ad2d28f236 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -905,6 +905,44 @@ int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
+int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
+ size_t size, gfp_t gfp_flags);
+int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
+struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
+ unsigned long offset);
+#if 0 /* for kernel-doc */
+/**
+ * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
+ * @substream: the substream to allocate the buffer to
+ * @size: the requested buffer size, in bytes
+ *
+ * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
+ * contiguous in kernel virtual space, but not in physical memory. Use this
+ * if the buffer is accessed by kernel code but not by device DMA.
+ *
+ * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
+ * code.
+ */
+static int snd_pcm_lib_alloc_vmalloc_buffer
+ (struct snd_pcm_substream *substream, size_t size);
+/**
+ * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
+ * @substream: the substream to allocate the buffer to
+ * @size: the requested buffer size, in bytes
+ *
+ * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
+ * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
+ */
+static int snd_pcm_lib_alloc_vmalloc_32_buffer
+ (struct snd_pcm_substream *substream, size_t size);
+#endif
+#define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
+ _snd_pcm_lib_alloc_vmalloc_buffer \
+ (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
+#define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
+ _snd_pcm_lib_alloc_vmalloc_buffer \
+ (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
+
#ifdef CONFIG_SND_DMA_SGBUF
/*
* SG-buffer handling