[Sound-open-firmware] How to debug rare DSP crashes (moving discussion over from GH)

[Paul Olaru]

Added an extra trace in the agent and now I can see indeed there is something.

I see that there is in fact a panic triggered by an agent. delta is computed as 1332551
in that case which would be more than the panic limit. CPU frequency 16 MHz.

ticks_per_msec seems to be set to 666000 for the CPU, so about 2ms when the panic
occurred (this last one occurred unusually fast actually, possibly because of the extra
traces within the agent itself maybe).

-----Original Message-----
From: Sound-open-firmware <sound-open-firmware-bounces at alsa-project.org> On Behalf Of Paul Olaru
Sent: Monday, October 28, 2019 3:33 PM
To: sound-open-firmware at alsa-project.org; Lauda, Tomasz <tomasz.lauda at intel.com>
Cc: Daniel Baluta <daniel.baluta at nxp.com>; Jerome Laclavere <jerome.laclavere at nxp.com>; Guido Roncarolo <guido.roncarolo at nxp.com>
Subject: Re: [Sound-open-firmware] How to debug rare DSP crashes (moving discussion over from GH)

Replying now, after I have added traces within platform_panic I *do not* see them (also
back on the default config I seem to have caused it to fail within first playthrough; it's also
luck based with the timing). Will try tomorrow to also add prints in the agent itself and
turn off other extra traces (so I don't get *too* much spam in the etrace buffer).

I had written trace_error in there, which should have added the error within the etrace
buffer I believe.

-----Original Message-----
From: Sound-open-firmware <sound-open-firmware-bounces at alsa-project.org> On Behalf Of Paul Olaru
Sent: Monday, October 28, 2019 2:22 PM
To: sound-open-firmware at alsa-project.org; Lauda, Tomasz <tomasz.lauda at intel.com>
Cc: Jerome Laclavere <jerome.laclavere at nxp.com>; Daniel Baluta <daniel.baluta at nxp.com>; Guido Roncarolo <guido.roncarolo at nxp.com>
Subject: [Sound-open-firmware] How to debug rare DSP crashes (moving discussion over from GH)

Moving the discussion from https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fthesofproject%2Fsof%2Fpull%2F1998&data=02%7C01%7Cpaul.olaru%40nxp.com%7C60861c84fc154902720508d75bab71d6%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637078664217550907&sdata=Qyao3uWpjwXpCSbwKBjvgszAf%2BO4QZnR9dXlq1TIJws%3D&reserved=0 over to this list.

In summary, whenever I have the system agent enabled and at default values, after two or
three continuous playthroughs (depending on which timer I use as the platform timer, for the
most part) of the same song (with duration 17:06) I get a complete freeze (with verbose traces
enabled I see no more activity in the trace mailbox, not even the WFX/WFE which are essentially
flooding the trace mailbox during normal function) and no signs of panic (I'm going to test now
with a trace added in platform_panic; currently this function is empty).

Disabling the system agent helps, changing CONFIG_SYSTICK_PERIOD to 2000 also helps. And I hear
no glitch at all during the playthroughs with either of these changes applied (although a 1ms or smaller
glitch once in 30 minutes is probably unnoticeable by any human ear is it?)

How should I continue with this?

I'll come back and mention if there is a panic or the freeze comes from something else.
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