#asahi-dev on 2023-01-06 — irc logs at oftc.irclog.whitequark.org

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06:15 <marcan> jannau: remember reset doesn't actually reset any memory, so if they have like a static global with the shmem info/state for that, it would survive

06:15 <marcan> the whole thing with not being able to actually reset firmware state is pretty cursed

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14:30 <jannau> DCP module reloading works! I must not call A500/set_dcp_power(0) on shutdown (or I suppose I have to call A500/set_dcp_power(1))

14:32 <jannau> still no ack for the initial SetSHM call though

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15:24 <marcan> jannau: wait so then when does A500 need to get called?

15:24 <jannau> there's free_signal / stop_signal but both crash dcp

15:25 <jannau> marcan: apparently only before

15:25 <jannau> apple_rtkit_idle()

15:26 <marcan> ah right, that's the one I used for suspend mode?

15:26 <jannau> yes

15:26 <marcan> ok, makes sense

15:28 <sven> iirc the pmgr reset is really just an interrupt for the asc so that missing shmem thing probably makes sense :(

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15:38 <jannau> the pmgr reset fixes the system endpoint re-initialization after IOP shutdown

15:44 <jannau> do we have code to intercept macos restart/shutdown in m1n1?

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16:10 <marcan> you can just watch it until the end, unless you want to do something after the shutdown?

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16:21 <jannau> dcp trace is incomplete due broken uart communication even with a single cpu core

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16:44 <marcan> are you sure it's incomplete and it doesn't just reboot the machine without cleaning up dcp?

16:44 <marcan> I'm pretty sure I could trace shutdown/reboot up to the action that actually triggers them

16:47 <sven> yeah, I’ve even seen the watchdog write just before reboot occasionally

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16:49 <sven> haven’t ever seen the hv survive suspend/resume though

16:52 <marcan> I've seen it survive suspend before, as in the machine looked quiesced but the HV console was still alive

16:52 <marcan> definitely never resumed out of that though, that would need specific handling

16:52 <marcan> but I do want to figure out what causes the death on suspend

16:53 <sven> my m1 mini reliably dies on suspend fwiw

16:53 <sven> like, Python exception dies because the serial port disappears

16:53 <marcan> I think I saw it work (sometimes) with pro/max machines, never on M1 or something like that?

16:54 <sven> could be, I only have this m1 here

16:58 <jannau> it looks like it dies while parsing dcp messages https://paste.debian.net/1266326/

16:59 <sven> that looks similar to what I get when I try to suspend

17:00 <sven> iirc the tty node disappears a moment later

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20:29 <jannau> looks like macos simply doesn't shutdown DCP on restart/shutdown and DCP still issues callbacks and syslog messages

20:31 <jannau> hack to avoid the reset: overwrite the data for 'MBSE' in the smc tracer

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