[alsa-devel] [PATCH v3 04/11] ALSA: core: Expand DMA buffer information

[Vinod Koul]

On 28-01-20, 11:43, Cezary Rojewski wrote:
> Update DMA buffer definition for snd_compr_runtime so it is represented
> similarly as in snd_pcm_runtime. While at it, modify
> snd_compr_set_runtime_buffer to account for newly added members.

Please run ./scripts/get_maintainer.pl, it will tell you the people you
should CC on a patch.

Also Takashi already acked, so you should add the acks/reviews received
in subsequent versions (unless they changed)

And for this:

Acked-by: Vinod Koul <vkoul at kernel.org>

> Signed-off-by: Cezary Rojewski <cezary.rojewski at intel.com>
> ---
>  include/sound/compress_driver.h | 35 ++++++++++++++++++++++++---------
>  1 file changed, 26 insertions(+), 9 deletions(-)
> 
> diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
> index bc88d6f964da..00f633c0c3ba 100644
> --- a/include/sound/compress_driver.h
> +++ b/include/sound/compress_driver.h
> @@ -23,7 +23,6 @@ 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
> @@ -34,11 +33,14 @@ struct snd_compr_ops;
>   * @total_bytes_transferred: cumulative bytes transferred by offload DSP
>   * @sleep: poll sleep
>   * @private_data: driver private data pointer
> + * @dma_area: virtual buffer address
> + * @dma_addr: physical buffer address (not accessible from main CPU)
> + * @dma_bytes: size of DMA area
> + * @dma_buffer_p: runtime dma buffer pointer
>   */
>  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;
> @@ -47,6 +49,11 @@ struct snd_compr_runtime {
>  	u64 total_bytes_transferred;
>  	wait_queue_head_t sleep;
>  	void *private_data;
> +
> +	unsigned char *dma_area;
> +	dma_addr_t dma_addr;
> +	size_t dma_bytes;
> +	struct snd_dma_buffer *dma_buffer_p;
>  };
>  
>  /**
> @@ -180,19 +187,29 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
>  
>  /**
>   * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
> - * @substream: compress substream to set
> + * @stream: compress stream 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)
> +static inline void
> +snd_compr_set_runtime_buffer(struct snd_compr_stream *stream,
> +			     struct snd_dma_buffer *bufp)
>  {
> -	struct snd_compr_runtime *runtime = substream->runtime;
> -
> -	runtime->dma_buffer_p = bufp;
> +	struct snd_compr_runtime *runtime = stream->runtime;
> +
> +	if (bufp) {
> +		runtime->dma_buffer_p = bufp;
> +		runtime->dma_area = bufp->area;
> +		runtime->dma_addr = bufp->addr;
> +		runtime->dma_bytes = bufp->bytes;
> +	} else {
> +		runtime->dma_buffer_p = NULL;
> +		runtime->dma_area = NULL;
> +		runtime->dma_addr = 0;
> +		runtime->dma_bytes = 0;
> +	}
>  }
>  
>  int snd_compr_stop_error(struct snd_compr_stream *stream,
> -- 
> 2.17.1
> 
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-- 
~Vinod