ASoC: SOF: ipc4: add a helper function to search debug slot

Currently IPC4 supports GDB slot, telemetry slot and
debug slot. This helper function will be used to get
the slot offset in debug windows for further processing.

Signed-off-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230919092416.4137-4-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 26 insertions, 0 deletions

diff --git a/sound/soc/sof/ipc4-priv.h b/sound/soc/sof/ipc4-priv.h
index a5d0b2eae464..9e69b7c29117 100644
--- a/sound/soc/sof/ipc4-priv.h
+++ b/sound/soc/sof/ipc4-priv.h
@@ -120,4 +120,7 @@ void sof_ipc4_update_cpc_from_manifest(struct snd_sof_dev *sdev,
 				       struct sof_ipc4_fw_module *fw_module,
 				       struct sof_ipc4_base_module_cfg *basecfg);
 
+size_t sof_ipc4_find_debug_slot_offset_by_type(struct snd_sof_dev *sdev,
+					       u32 slot_type);
+
 #endif
diff --git a/sound/soc/sof/ipc4.c b/sound/soc/sof/ipc4.c
index 6c33ee5af32b..4673c53f6c03 100644
--- a/sound/soc/sof/ipc4.c
+++ b/sound/soc/sof/ipc4.c
@@ -547,6 +547,29 @@ static int sof_ipc4_init_msg_memory(struct snd_sof_dev *sdev)
 	return 0;
 }
 
+size_t sof_ipc4_find_debug_slot_offset_by_type(struct snd_sof_dev *sdev,
+					       u32 slot_type)
+{
+	size_t slot_desc_type_offset;
+	u32 type;
+	int i;
+
+	/* The type is the second u32 in the slot descriptor */
+	slot_desc_type_offset = sdev->debug_box.offset + sizeof(u32);
+	for (i = 0; i < SOF_IPC4_MAX_DEBUG_SLOTS; i++) {
+		sof_mailbox_read(sdev, slot_desc_type_offset, &type, sizeof(type));
+
+		if (type == slot_type)
+			return sdev->debug_box.offset + (i + 1) * SOF_IPC4_DEBUG_SLOT_SIZE;
+
+		slot_desc_type_offset += SOF_IPC4_DEBUG_DESCRIPTOR_SIZE;
+	}
+
+	dev_dbg(sdev->dev, "Slot type %#x is not available in debug window\n", slot_type);
+	return 0;
+}
+EXPORT_SYMBOL(sof_ipc4_find_debug_slot_offset_by_type);
+
 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;