#asahi on 2025-07-31 — irc logs at oftc.catirclogs.org

2024-07-16 04:52 ChanServ changed the topic of #asahi to: Asahi Linux: porting Linux to Apple Silicon macs | "Does XXX work yet?": https://alx.sh/fs | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Topics: #asahi-dev #asahi-re #asahi-gpu #asahi-alt #asahi-stream #asahi-offtopic | Keep things on topic | Logs: https://alx.sh/l/asahi

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09:25 <druckerjunge> Hey, maybe this might be a bit offtopic, as it is not directly related to asahi linux. I am hoping on getting information about interacting with the low level hardware of the mac book pro m4. Currently researching on the topic of energy sensors on apple silicon, similiar to Intel RAPL. I got my hands on an mac book pro M4. As far as I can tell, apple also integrated some kind of energy meter into the chip. By dumping ioreg

09:25 <druckerjunge> I came accross the "pmgr" device inside the CPU. The device shows several strings uppon dump like "total energy" or "ECPU0". So I guess there must be a way to read the actual values present in this component. I thought maybe one of you has already interacted with the energy meters on apple silicon and could share their experience. If this is not the right place, please excuse this long message. Kind regards

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09:36 <chaos_princess> how do you intend to access them, from macos? if so, you can't, it is a hardware device that it wont give you direct access to. you will have to parse the ioreg database to get this data out

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09:41 <druckerjunge> Currently I'm not that deep into macos details. I thought about accessing some kind of device/register etc. using maybe elevated rights via a simple C++ interface.

09:42 <chaos_princess> ofc not, you'd need a kext to have direct access to a device and macos does not like new kexts

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09:44 <chaos_princess> https://developer.apple.com/documentation/iokit - this is how you access the data, or at least some of it

09:45 <druckerjunge> Hmmm I somewhat expected this. But this definetly helps in understanding what I was seeing. Will take a deeper look into the documentation. Thank you, for you input.

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12:14 <fl0_id> druckerjunge you can look at what asimon and similar software does, which is calling private functions iirc. but the underlying mechanism is basically what chaos_princess said. And afaik it's not necessarily actual measurement, similar to RAPL, it's often an approximation. (afaik)

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12:16 <fl0_id> I repurposed this function calling code into a python module here: https://github.com/step21/pymacjoule/blob/main/src/lib.rs

12:16 <fl0_id> https://github.com/step21/pymacjoule

12:16 <fl0_id> However it's likely that it would need to be adapted for m4 or newer macos versions

12:16 <fl0_id> I only tested with m3 and 14.x

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12:37 <chadmed> the SMC's power endpoints are a mix of derived and actual values. P**R are all measured as far as we know, and P**C are all derived

12:40 <chaos_princess> there are real energy counters in one of the pmgr mmios

12:40 <chaos_princess> and by one i mean at least (3 * cluster count) or so

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12:57 <fl0_id> that's good to know. Still what you usually get as data is afaik an amalgamation and thus only partially measured?

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13:05 <larstiq_> also on the physical level, a measurement is an approximation of reality so it's more a matter of how approximate

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13:06 <fl0_id> larstiq_ yeah ofc. I didn

13:07 <fl0_id> *didn't want to say this is necessarily bad, just felt like I had to add this as I had a discussion with some researchers and they were all like "ok we only measured at the wall" or sth like that

13:07 <larstiq_> right

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13:07 <larstiq_> fl0_id: for me it's e.g. fuel flow meters

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13:10 <fl0_id> in what context, if I may ask?

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13:17 <larstiq_> fl0_id: optimization of operation of ships, need to know how much and which kind of fuels flow to which engines

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13:30 <fl0_id> larstiq_ cool, thx

13:30 <larstiq_> it's a surprising heap of garbage data sometimes

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13:42 <fl0_id> haha. yeah I can imagine, even though I only have experience with relatively simple sensors for iot applications like measuring my gas consumption. In theory it's relatively easy but sometimes...

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18:59 <ice9> guys what's the status of Asahi nowadays, does it fully support the Macbook laptops and works perfectly normal?

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19:04 <j`ey> not all hardware works, no

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19:08 <ice9> j`ey, at least is it ready for production?

19:08 <j`ey> that's pretty vauge

19:09 <j`ey> but it's stable et

19:09 <j`ey> c

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19:16 <opticron> ice9, they're usable as daily drivers

19:16 <opticron> M1/M2 series anyway

19:17 <ice9> I see

19:17 <opticron> M3/M4 series are not supported yet

19:20 <opticron> the biggest caveat is no video out over USB Type-C (but HDMI ports built-in work) and other Type-C shenanigans like Thunderbolt, but that's being actively worked on, iirc

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