ALSA: soc-compress: add support to snd_compr_set_runtime_buffer()

Existing compress offload code allocates data buffers using simple kmalloc,
however there are situations where these buffers have to be mapped
in smmu. So provide a way to set the runtime buffer by the driver itself,
simillar to what we do with pcm.

This patch adds support to set runtime dma buffer on compressed stream.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
index ea8c93bbb0e05490b023fdf402e8aa1d2f76ceeb..0cdc3999ecfa84ebb289eca932b33d1806c2fa13 100644 (file)
--- a/include/sound/compress_driver.h
+++ b/include/sound/compress_driver.h
@@ -23,6 +23,7 @@ struct snd_compr_ops;
  * struct snd_compr_runtime: runtime stream description
  * @state: stream state
  * @ops: pointer to DSP callbacks
+ * @dma_buffer_p: runtime dma buffer pointer
  * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
  *     DSP doesn't implement copy
  * @buffer_size: size of the above buffer
@@ -37,6 +38,7 @@ struct snd_compr_ops;
 struct snd_compr_runtime {
        snd_pcm_state_t state;
        struct snd_compr_ops *ops;
+       struct snd_dma_buffer *dma_buffer_p;
        void *buffer;
        u64 buffer_size;
        u32 fragment_size;
@@ -175,6 +177,23 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
        wake_up(&stream->runtime->sleep);
 }
 
+/**
+ * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
+ * @substream: compress substream to set
+ * @bufp: the buffer information, NULL to clear
+ *
+ * Copy the buffer information to runtime buffer when @bufp is non-NULL.
+ * Otherwise it clears the current buffer information.
+ */
+static inline void snd_compr_set_runtime_buffer(
+                                       struct snd_compr_stream *substream,
+                                       struct snd_dma_buffer *bufp)
+{
+       struct snd_compr_runtime *runtime = substream->runtime;
+
+       runtime->dma_buffer_p = bufp;
+}
+
 int snd_compr_stop_error(struct snd_compr_stream *stream,
                         snd_pcm_state_t state);