ChanServ changed the topic of #asahi-dev to: Asahi Linux: porting Linux to Apple Silicon macs | Non-development talk: #asahi | General development | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-dev
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<marcan>
povik: pushed the testtone/notebook stuff
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<sven>
hrm, so the acio dart's stream 15 is set to bypass by macos
<sven>
thunderbolt still works if I don't do that
<sven>
I've enabled translation without setting up any pagetables and get these faults: apple-dart 501a80000.iommu: translation fault: status:0x8f0f0001 stream:15 code:0x1 (NO TTBR FOR IOVA) at 0x100100
<sven>
so... uh... what the hell is that stream doing?
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<jannau>
sven: could it be a backchannel to pmgr / pmp?
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<jannau>
bt device/key parsing from nvram done. I guess I should write asahi-btsync in rust as well to avoid a stdout / shell interaction with device supplied name fields
<jannau>
to bad bluez seems to have no import device (with pairing key) functionality
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<chadmed>
using rtkit to give pipewire "proper" "realtime" support fixes all the buffer overflowing issues with the compressor
<chadmed>
it does have a higher affinity for pcores now but i think thats alright, better than choppy audio
<chadmed>
power use is ~the same anyway
<chadmed>
moving the cursor pushes up power consumption more than playing music does
<jannau>
the trackpad generates ~10k irq/s
<povik>
hah
<povik>
do we want to bring up sio to address that?
<povik>
or is there something else we can do to push the irq number down?
<maz>
don't touch the trackpad? :D
<povik>
other than that... :P
<maz>
some trackpads have a "precision" setting that influence the rate of updates, and thus the rate of IRQs.
<chadmed>
its quite entertaining watching the scheduler try to pass irq threads around when you move the trackpad. the thing goes from every core sitting at 0 to multiple pcores running up 5-10% utilisation
<maz>
(vague memory from a previous life)
<jannau>
add delays in the irq hadnler
* maz
throws something at jannau
<jannau>
I think aic2 helpfully distributes the irq to all cores
<maz>
yeah, it has no notion of affinity to speak of. which is an annoyance on its own (Linux is not very well equipped to deal with 1:N distribution)
<maz>
I'll eventually have to do something about that, as some GIC users are doing that too these days.
<jannau>
povik: not sure if sio will help much. I doubt the spi transfers itself cause too much cpu load compared to the event parsing and input handling
<povik>
wouldn't there be significant overhead in handling the 10k/s irqs?
<povik>
i assume the number of events is much lower and we spend many irqs per event
<povik>
(i'm just guessing here, no hard numbers at hand)
<jannau>
the interrupt handling in spi_hid should maybe re-thought
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<dottedmag>
jannau: This happens on boot, couldn't one supply bluez with the files in /var/lib/bluetooth directly? Though the file format is documented as "discouraged to access directly", of course.
<jannau>
dottedmag: yes, I'll plan to manage /var/lib/bluetooth directly but it's annoying
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<sven>
jannau: hm... possibly. the iova which should be 1:1 to phyaddr in bypass mode is just very strange
<sven>
and ofc the thunderbolt/usb4 firmware has almost no strings :<
<povik>
i remember there could be offsets applied in bypass mode but you probably checked for those
<sven>
yeah, and there's also not DAPF behind the DART
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<sven>
hrm, every write to a NHI ring seems to trigger that fault
<sven>
let's see if I can just map that page to some memory and observe if it tries to write anything there
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<sven>
... that probably didn't work because stream 15 just seems to be related to an entirely different physical space afaict
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<sven>
jannau: can you trace a acio dart on your j314? the adt you sent me some time ago seems to have a bypass-address configured for those
<sven>
ohh… wait.. maybe whatever triggers that 0x100100 access actually sends a 64bit address but because once I enable translation I’m limited to 32bit I just don’t see the upper bits
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<jannau>
sven: how do you trace dart-acio? trace_dart.py accesses the dart too early
<povik>
how come a trace script accesses the dart at all?
<sven>
just trace_device should work
<sven>
i only care about the TCR value for stream 15
<sven>
you need to plug in a tbt device fwiw
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<sven>
it doesn’t matter much because thunderbolt works just fine even with that stream set to block all access but I’d really like to know what these 0x100100 reads/writes are supposed to do
<jannau>
dev 0f: TCR=0x20000 (BYPASS_DAPF=0, BYPASS_DART=0, TRANSLATE_ENABLE=0)
<sven>
guess we can eventually try and see what happens on t6k with my Linux driver and that stream set to translate with an empty pagetable
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<marcan>
kh: As far as I know, yes, certainly without significant discussion first.
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<jeffmiw>
debugging some probably wrong usage of dt of_ functions, that makes a sequence of insmod/rmmod/insmod creating a cpu deadlock :) the 2nd insmod get stuck on an of_find_node_by_name for a node that does not exist ... the first insmod works well with it ...
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