ASoC: SOF: add exception node in sof debugfs directory

It is used for binary dump of exception information.

Signed-off-by: Rander Wang <rander.wang@intel.com>

sound/soc/sof/ipc4.c

@@ -542,6 +542,20 @@ static int sof_ipc4_init_msg_memory(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+static void sof_ipc4_create_exception_debugfs_node(struct snd_sof_dev *sdev)
+{
+	u32 telemetry_data_offset;
+
+	/* strip the first magic number dword */
+	telemetry_data_offset = sdev->debug_box.offset + sizeof(u32) +
+			(SOF_IPC4_DEBUG_TELEMETRY_SLOT_ID + 1) * SOF_IPC4_DEBUG_SLOT_SIZE;
+
+	snd_sof_debugfs_add_region_item(sdev, SOF_FW_BLK_TYPE_SRAM,
+					telemetry_data_offset,
+					SOF_IPC4_DEBUG_SLOT_SIZE, "exception",
+					SOF_DEBUGFS_ACCESS_D0_ONLY);
+}
+
 static int ipc4_fw_ready(struct snd_sof_dev *sdev, struct sof_ipc4_msg *ipc4_msg)
 {
 	int inbox_offset, inbox_size, outbox_offset, outbox_size;
@@ -569,6 +583,7 @@ static int ipc4_fw_ready(struct snd_sof_dev *sdev, struct sof_ipc4_msg *ipc4_msg
 
 	sdev->debug_box.offset = snd_sof_dsp_get_window_offset(sdev,
 							SOF_IPC4_DEBUG_WINDOW_IDX);
+	sof_ipc4_create_exception_debugfs_node(sdev);
 
 	dev_dbg(sdev->dev, "mailbox upstream 0x%x - size 0x%x\n",
 		inbox_offset, inbox_size);