ASoC: SOF: ipc4-topology: Correct data structures for the SRC module

Separate the IPC message part as struct sof_ipc4_src_data. This struct
describes the message payload passed to the firmware via the mailbox.

It is not wise to be 'clever' and try to use the first part of a struct
as IPC message without marking the message section as packed and aligned.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20231129131411.27516-2-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: ujfalusi

sound/soc/sof/ipc4-topology.c

@@ -141,7 +141,7 @@ static const struct sof_topology_token gain_tokens[] = {
 /* SRC */
 static const struct sof_topology_token src_tokens[] = {
 	{SOF_TKN_SRC_RATE_OUT, SND_SOC_TPLG_TUPLE_TYPE_WORD, get_token_u32,
-		offsetof(struct sof_ipc4_src, sink_rate)},
+		offsetof(struct sof_ipc4_src_data, sink_rate)},
 };
 
 static const struct sof_token_info ipc4_token_list[SOF_TOKEN_COUNT] = {
@@ -811,11 +811,12 @@ static int sof_ipc4_widget_setup_comp_src(struct snd_sof_widget *swidget)
 
 	swidget->private = src;
 
-	ret = sof_ipc4_get_audio_fmt(scomp, swidget, &src->available_fmt, &src->base_config);
+	ret = sof_ipc4_get_audio_fmt(scomp, swidget, &src->available_fmt,
+				     &src->data.base_config);
 	if (ret)
 		goto err;
 
-	ret = sof_update_ipc_object(scomp, src, SOF_SRC_TOKENS, swidget->tuples,
+	ret = sof_update_ipc_object(scomp, &src->data, SOF_SRC_TOKENS, swidget->tuples,
 				    swidget->num_tuples, sizeof(*src), 1);
 	if (ret) {
 		dev_err(scomp->dev, "Parsing SRC tokens failed\n");
@@ -824,7 +825,7 @@ static int sof_ipc4_widget_setup_comp_src(struct snd_sof_widget *swidget)
 
 	spipe->core_mask |= BIT(swidget->core);
 
-	dev_dbg(scomp->dev, "SRC sink rate %d\n", src->sink_rate);
+	dev_dbg(scomp->dev, "SRC sink rate %d\n", src->data.sink_rate);
 
 	ret = sof_ipc4_widget_setup_msg(swidget, &src->msg);
 	if (ret)
@@ -1900,7 +1901,7 @@ static int sof_ipc4_prepare_src_module(struct snd_sof_widget *swidget,
 	u32 out_ref_rate, out_ref_channels, out_ref_valid_bits;
 	int output_format_index, input_format_index;
 
-	input_format_index = sof_ipc4_init_input_audio_fmt(sdev, swidget, &src->base_config,
+	input_format_index = sof_ipc4_init_input_audio_fmt(sdev, swidget, &src->data.base_config,
 							   pipeline_params, available_fmt);
 	if (input_format_index < 0)
 		return input_format_index;
@@ -1930,7 +1931,7 @@ static int sof_ipc4_prepare_src_module(struct snd_sof_widget *swidget,
 	 */
 	out_ref_rate = params_rate(fe_params);
 
-	output_format_index = sof_ipc4_init_output_audio_fmt(sdev, &src->base_config,
+	output_format_index = sof_ipc4_init_output_audio_fmt(sdev, &src->data.base_config,
 							     available_fmt, out_ref_rate,
 							     out_ref_channels, out_ref_valid_bits);
 	if (output_format_index < 0) {
@@ -1940,10 +1941,10 @@ static int sof_ipc4_prepare_src_module(struct snd_sof_widget *swidget,
 	}
 
 	/* update pipeline memory usage */
-	sof_ipc4_update_resource_usage(sdev, swidget, &src->base_config);
+	sof_ipc4_update_resource_usage(sdev, swidget, &src->data.base_config);
 
 	out_audio_fmt = &available_fmt->output_pin_fmts[output_format_index].audio_fmt;
-	src->sink_rate = out_audio_fmt->sampling_frequency;
+	src->data.sink_rate = out_audio_fmt->sampling_frequency;
 
 	/* update pipeline_params for sink widgets */
 	return sof_ipc4_update_hw_params(sdev, pipeline_params, out_audio_fmt);
@@ -2344,8 +2345,8 @@ static int sof_ipc4_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget
 	{
 		struct sof_ipc4_src *src = swidget->private;
 
-		ipc_size = sizeof(struct sof_ipc4_base_module_cfg) + sizeof(src->sink_rate);
-		ipc_data = src;
+		ipc_size = sizeof(src->data);
+		ipc_data = &src->data;
 
 		msg = &src->msg;
 		break;

sound/soc/sof/ipc4-topology.h

@@ -404,16 +404,24 @@ struct sof_ipc4_mixer {
 	struct sof_ipc4_msg msg;
 };
 
-/**
- * struct sof_ipc4_src SRC config data
+/*
+ * struct sof_ipc4_src_data - IPC data for SRC
  * @base_config: IPC base config data
  * @sink_rate: Output rate for sink module
+ */
+struct sof_ipc4_src_data {
+	struct sof_ipc4_base_module_cfg base_config;
+	uint32_t sink_rate;
+} __packed __aligned(4);
+
+/**
+ * struct sof_ipc4_src - SRC config data
+ * @data: IPC base config data
  * @available_fmt: Available audio format
  * @msg: IPC4 message struct containing header and data info
  */
 struct sof_ipc4_src {
-	struct sof_ipc4_base_module_cfg base_config;
-	uint32_t sink_rate;
+	struct sof_ipc4_src_data data;
 	struct sof_ipc4_available_audio_format available_fmt;
 	struct sof_ipc4_msg msg;
 };