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>

1 files changed, 54 insertions, 0 deletions

diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index caa7796bc2f..d9727c74b2e 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -434,3 +434,57 @@ 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()
+ */
+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.
+ */
+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);