#asahi-dev on 2025-09-05 — irc logs at oftc.catirclogs.org

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13:59 <alexaltea> @sven i'm trying to get m2 (t8112) support on eiln's ane drivers. right now the dart code is a bit messy (hardcoded stream select/cmd/invalidate offsets for m1)

13:59 <alexaltea> i was wondering if we have any other drivers making use of the 0x4000-sized dart regs, just to see clean examples that I could follow to avoid code duplication

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14:06 <jannau> alexaltea: can you point to the specific code. I don't quite follow what you're asking

14:07 <alexaltea> @jannau: apologies, here's the code: https://github.com/eiln/ane/blob/main/ane/src/ane_drv.c#L41-L54

14:09 <alexaltea> .select, .command, .invalidate are hardcoded with offsets for M1 darts, adding M2 dart support will require significant refactoring since command submission is also quite different: https://gitlab.com/fedora-asahi/kernel-asahi/-/blob/fedora-asahi-6.16/drivers/iommu/apple-dart.c#L535-547

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14:11 <alexaltea> the question is: would you recommend copy-pasting code from `/drivers/iommu/apple-dart.c` into the ANE drivers? And if not, is there any better way to dealing with different dart models when writing a driver?

14:17 <chaos_princess> i might be wrong, but, why is it touching darts directly, that is not how you are supposed to write drivers

14:18 <alexaltea> yep, that's the better question. I have honestly no idea. I've emailed eiln about that, since I'd really like to get ane into an upstreamable state

14:18 <chaos_princess> ane is very difficult imo, there is no userspace for it

14:19 <chaos_princess> maybe reach out to tomeu vizoso about how to approach the whole matmul accelerators space correctly

14:22 <alexaltea> yes, I was planning to work on ane userspace after having a working driver that doesn't kpanic :D

14:22 <alexaltea> good point re tomeu vizoso, thank you!

14:31 <jannau> in first approximation it shouldn't access dart directly but use the dma api and gem-shmem helpers

14:32 <jannau> https://github.com/AsahiLinux/linux/blob/asahi/drivers/accel/ivpu/ivpu_gem.c could be a good reference

14:33 <jannau> I forgot that ane did this

14:34 <alexaltea> thanks jannau

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14:36 <alexaltea> also, it seems it uses actually dma/gem for dart0, most of the direct accesses are for dart1 and dart2

14:36 <chaos_princess> right, that

14:37 <chaos_princess> so, some devices like ane and isp have "linked darts" where you need all darts set to the same thing

14:37 <jannau> feel free to ask more questions

14:37 <chaos_princess> and isp/ane were originally made, we didn't have support for dealing with it all sanely

14:37 <chaos_princess> now i _think_, you just add all 3 darts into the device tree and it does the right thing

14:38 <chaos_princess> basically, copy what isp already does :P

14:39 <alexaltea> I had no idea about the linked darts, that helps. I'll try to replicate the isp code, thanks again

14:40 <chaos_princess> only replicate dealing with darts, the rest of the isp's iommu code - you probably shouldn't

14:40 <jannau> you should not need to do anything specific

14:41 <chaos_princess> yes, if i remember correctly, you just add all three and the iommu code will automatically replicate everything

14:43 <jannau> just add "iommus = <&ane_dart_0 0>, <&ane_dart_1 0>, <&ane_dart_2 0>;" to the device tree and defien those free dart instances

14:44 <jannau> see dwc3_0_dart_0 / dwc3_0_dart_1 for another example

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16:20 <sven> yeah, this has been supported since dart was upstream specifically because usb needs this as well

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