ipc4: handler: Add support for rx payload with LARGE_CONFIG_GET messages

Some LARGE_CONFIG_GET message includes payload to provide instructions
to the handler modules on how to fulfill the request.

The generic control messages are such examples (they are not related to
VENDOR_CONFIG_PARAM messages):
The payload from host includes the sof_ipc4_control_msg_payload struct to
describe the ID of the control for example. Alone the type (enum, switch
or bytes) is not enough to know _which_ control's information is requested.
Similarly, the control's ID does not identify the control's type.

When such generic control message is received, the payload is copied from
hostbox to the comp_data and the handler module can inspect it before
overwriting it with the requested data.

Note: currently we don't have modules which would handle generic control
get functionality, but they would not have worked, because the information
was not available to them to decide which control's data needs to be
returned.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

src/ipc/ipc4/handler.c

@@ -996,6 +996,36 @@ static int ipc4_set_get_config_module_instance(struct ipc4_message_request *ipc4
 	return ret;
 }
 
+__cold static void ipc4_prepare_for_kcontrol_get(struct comp_dev *dev, uint8_t param_id,
+						 char *data_out, uint32_t data_size)
+{
+	const char *hostbox;
+
+#if CONFIG_LIBRARY
+	hostbox = (const char *)ipc_get()->comp_data + sizeof(struct ipc4_module_large_config);
+#else
+	hostbox = (const char *)MAILBOX_HOSTBOX_BASE;
+#endif
+
+	assert_can_be_cold();
+
+	switch (param_id) {
+	case SOF_IPC4_SWITCH_CONTROL_PARAM_ID:
+	case SOF_IPC4_ENUM_CONTROL_PARAM_ID:
+	case SOF_IPC4_BYTES_CONTROL_PARAM_ID:
+		/* We have payload in hostbox */
+		dcache_invalidate_region((__sparse_force void __sparse_cache *)MAILBOX_HOSTBOX_BASE,
+					 data_size);
+
+		/* Copy the control payload header from inbox to outbox */
+		memcpy_s(data_out, data_size, hostbox,
+			 sizeof(struct sof_ipc4_control_msg_payload));
+		break;
+	default:
+		break;
+	}
+}
+
 __cold static int  ipc4_get_vendor_config_module_instance(struct comp_dev *dev,
 						   const struct comp_driver *drv,
 						   bool init_block,
@@ -1154,6 +1184,9 @@ __cold static int ipc4_get_large_config_module_instance(struct ipc4_message_requ
 #if CONFIG_LIBRARY
 		data += sizeof(reply);
 #endif
+		ipc4_prepare_for_kcontrol_get(dev, config.extension.r.large_param_id,
+					      data, data_offset);
+
 		ret = drv->ops.get_large_config(dev, config.extension.r.large_param_id,
 						config.extension.r.init_block,
 						config.extension.r.final_block,