ASoC: SOF: ipc4: Add support for mtrace log extraction

One of the debugging/logging features for an IPC4 based firmware is the use
of the debug window to deliver log messages to host via the shared SRAM.

The initial implementation of the mtrace supports only TGL/MTL style of
logging, but can be extended to support other types, like APL, SKL, CNL,
etc.

The window is split into 16 'slots' where the first slot contains the
descriptors for the remaining 15 slots.

Each DSP core logs to a separate slot and the slot allocation is not fixed,
we can not assume that the first slot is always used by core0 for example.

The firmware sends LOG_BUFFER_STATUS message when new log batch is
available from one of the cores (after it updated the write_ptr in the
given slot).
Host should update the read_ptr in the same slot when it has taken out log
data.

The patch also updates the sof_ipc4_fw_data struct with parameters needed
for the mtrace to be enabled and used safely.

Co-developed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Rander Wang <rander.wang@intel.com>
Co-developed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20220909114332.31393-6-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/soc/sof/ipc4-loader.c b/sound/soc/sof/ipc4-loader.c
index 8bd2132b4f41..c678f05d0ef5 100644
--- a/sound/soc/sof/ipc4-loader.c
+++ b/sound/soc/sof/ipc4-loader.c
@@ -157,6 +157,7 @@ static int sof_ipc4_validate_firmware(struct snd_sof_dev *sdev)
 
 static int sof_ipc4_query_fw_configuration(struct snd_sof_dev *sdev)
 {
+	struct sof_ipc4_fw_data *ipc4_data = sdev->private;
 	const struct sof_ipc_ops *iops = sdev->ipc->ops;
 	struct sof_ipc4_fw_version *fw_ver;
 	struct sof_ipc4_tuple *tuple;
@@ -200,6 +201,7 @@ static int sof_ipc4_query_fw_configuration(struct snd_sof_dev *sdev)
 			break;
 		case SOF_IPC4_FW_CFG_TRACE_LOG_BYTES:
 			dev_vdbg(sdev->dev, "Trace log size: %u\n", *tuple->value);
+			ipc4_data->mtrace_log_bytes = *tuple->value;
 			break;
 		default:
 			break;