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[0/3] ASoC: SOF: ipc3-dtrace: Handle race during initialization

Message ID 20220610080119.30880-1-peter.ujfalusi@linux.intel.com
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Series ASoC: SOF: ipc3-dtrace: Handle race during initialization | expand

Message

Peter Ujfalusi June 10, 2022, 8:01 a.m. UTC 
Hi,

This series handles the race which can result missing the first position update
after the trace is enabled.
In short: the firmware might send the position update (if we have enough
trace data generated) after the dma-trace is enabled by the TRACE_DMA_PARAMS_EXT
message. Depending on scheduling, load, preemption on Linux side we have seen
that occasionally this first position update got missed and we missed reading it
out.

A new state and more strict handling of host_offset can overcome this issue,
making the dtrace more reliable.

Regards,
Peter
---
Peter Ujfalusi (3):
  ASoC: SOF: ipc3-dtrace: Introduce SOF_DTRACE_INITIALIZING state
  ASoC: SOF: ipc3-dtrace: Add helper function to update the
    sdev->host_offset
  ASoC: SOF: ipc3-dtrace: Return from dtrace_read if there is no new
    data available

 sound/soc/sof/ipc3-dtrace.c | 47 ++++++++++++++++++++++++++++++-------
 1 file changed, 38 insertions(+), 9 deletions(-)