audio: use BUFFER_USAGE_SHARED for all DMA buffers

Buffers allocated for DMA are shared buffers as they are accessed
both by the DMA hardware as well as DSP core. Mark these buffers
as shared in the SOF buffer usage flags, allowing to use common
infra to ensure cache coherency.

Chain DMA buffers are in theory only used by the DMA, but as the
DSP code does initial zeroing of the buffer, it is still a shared
buffer.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Author: kv2019i

src/audio/chain_dma.c

@@ -592,7 +592,7 @@ __cold static int chain_task_init(struct comp_dev *dev, uint8_t host_dma_id, uin
 	fifo_size = ALIGN_UP_INTERNAL(fifo_size, addr_align);
 	/* allocate not shared buffer */
 	cd->dma_buffer = buffer_alloc(fifo_size, SOF_MEM_FLAG_USER | SOF_MEM_FLAG_DMA,
-				      addr_align, BUFFER_USAGE_NOT_SHARED);
+				      addr_align, BUFFER_USAGE_SHARED);
 
 	if (!cd->dma_buffer) {
 		comp_err(dev, "failed to alloc dma buffer");

src/audio/dai-legacy.c

@@ -562,7 +562,7 @@ int dai_common_params(struct dai_data *dd, struct comp_dev *dev,
 		}
 	} else {
 		dd->dma_buffer = buffer_alloc(buffer_size, SOF_MEM_FLAG_USER | SOF_MEM_FLAG_DMA,
-					      addr_align, BUFFER_USAGE_NOT_SHARED);
+					      addr_align, BUFFER_USAGE_SHARED);
 		if (!dd->dma_buffer) {
 			comp_err(dev, "failed to alloc dma buffer");
 			return -ENOMEM;

src/audio/dai-zephyr.c

@@ -1021,7 +1021,7 @@ static int dai_set_dma_buffer(struct dai_data *dd, struct comp_dev *dev,
 	} else {
 		dd->dma_buffer = buffer_alloc_range(buffer_size_preferred, buffer_size,
 						    SOF_MEM_FLAG_USER | SOF_MEM_FLAG_DMA,
-						    addr_align, BUFFER_USAGE_NOT_SHARED);
+						    addr_align, BUFFER_USAGE_SHARED);
 		if (!dd->dma_buffer) {
 			comp_err(dev, "failed to alloc dma buffer");
 			return -ENOMEM;

src/audio/host-legacy.c

@@ -760,7 +760,7 @@ int host_common_params(struct host_data *hd, struct comp_dev *dev,
 		}
 	} else {
 		hd->dma_buffer = buffer_alloc(buffer_size, SOF_MEM_FLAG_USER | SOF_MEM_FLAG_DMA,
-					      addr_align, BUFFER_USAGE_NOT_SHARED);
+					      addr_align, BUFFER_USAGE_SHARED);
 		if (!hd->dma_buffer) {
 			comp_err(dev, "failed to alloc dma buffer");
 			err = -ENOMEM;

src/audio/host-zephyr.c

@@ -922,7 +922,7 @@ int host_common_params(struct host_data *hd, struct comp_dev *dev,
 		/* allocate not shared buffer */
 		hd->dma_buffer = buffer_alloc_range(buffer_size_preferred, buffer_size,
 						    SOF_MEM_FLAG_USER | SOF_MEM_FLAG_DMA,
-						    addr_align, BUFFER_USAGE_NOT_SHARED);
+						    addr_align, BUFFER_USAGE_SHARED);
 		if (!hd->dma_buffer) {
 			comp_err(dev, "failed to alloc dma buffer");
 			return -ENOMEM;