audio: host: remove one buffer usage in host copy

during host copy, buffer acuquire and release should be used
as less as possible, since it takes a lot of cycles, for this
patch, cycle reduction is: 425 to 406, nearly 5% reduced.

note: test plafrom is tgl up board with sof debug build, base
platform clock is 38.4mhz.

Signed-off-by: Baofeng Tian <baofeng.tian@intel.com>

src/audio/host-zephyr.c

@@ -455,7 +455,6 @@ static inline bool stream_sync(struct host_data *hd, struct comp_dev *dev)
  */
 static int host_copy_normal(struct host_data *hd, struct comp_dev *dev, copy_callback_t cb)
 {
- struct comp_buffer *buffer_c;
  uint32_t copy_bytes;
  const unsigned int threshold =
 #if CONFIG_HOST_DMA_RELOAD_DELAY_ENABLE
@@ -473,7 +472,6 @@ static int host_copy_normal(struct host_data *hd, struct comp_dev *dev, copy_cal
  cb(dev, copy_bytes);
 
  hd->partial_size += copy_bytes;
- buffer_c = buffer_acquire(hd->dma_buffer);
 
  /*
  * On large buffers we don't need to reload DMA on every period. When
@@ -482,8 +480,8 @@ static int host_copy_normal(struct host_data *hd, struct comp_dev *dev, copy_cal
  * also adding a 2ms safety margin.
  */
  if (!IS_ENABLED(CONFIG_HOST_DMA_RELOAD_DELAY_ENABLE) ||
- audio_stream_get_size(&buffer_c->stream) < hd->period_bytes << 3 ||
- audio_stream_get_size(&buffer_c->stream) - hd->partial_size <=
+ hd->dma_buffer_size < hd->period_bytes << 3 ||
+ hd->dma_buffer_size - hd->partial_size <=
  (2 + threshold) * hd->period_bytes) {
  if (stream_sync(hd, dev)) {
  ret = dma_reload(hd->chan->dma->z_dev, hd->chan->index, 0, 0,
@@ -494,9 +492,6 @@ static int host_copy_normal(struct host_data *hd, struct comp_dev *dev, copy_cal
  hd->partial_size = 0;
  }
  }
-
- buffer_release(buffer_c);
-
  return ret;
 }
 
@@ -872,6 +867,7 @@ int host_common_params(struct host_data *hd, struct comp_dev *dev,
 
  config->src_width = audio_stream_sample_bytes(&dma_buf_c->stream);
  config->dest_width = config->src_width;
+ hd->dma_buffer_size = audio_stream_get_size(&dma_buf_c->stream);
  buffer_release(dma_buf_c);
  }
 

src/include/sof/audio/host_copier.h

@@ -96,6 +96,7 @@ struct host_data {
  /* stream info */
  struct sof_ipc_stream_posn posn; /* TODO: update this */
  struct ipc_msg *msg; /**< host notification */
+ uint32_t dma_buffer_size; /* dma buffer size */
 #if CONFIG_HOST_DMA_STREAM_SYNCHRONIZATION
  bool is_grouped;
  uint8_t group_id;