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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<maz>
jannau: do we really need the backport to stable of "PCI: apple: Set only available ports up"? prior versions of Asahi don't need to take the backport, and upstream doesn't really care yet. but maybe you have other plans for it that would require backporting?
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<jannau>
maz: upstream "needs" it for the imac with 2 usb-c ports (t8103-j457) since commit a0189fdfb73d ("arm64: dts: apple: t8103: Disable unused PCIe ports")
<maz>
jannau: ah, fair enough. I'll reorder the series before reposting it then.
<jannau>
similar situation as the m2 pro mac mini. When I tried to submit one of the PCI maintainers wasn't convinced it's needed at all
<maz>
let's see if we have better luck this time. if they are annoyed by that, they can drop the cc stable themselves.
<maz>
I'll add the reference to this commit as a justification.
<jannau>
feel free to add my tested-by: I'll reply in a moment
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<jannau>
the change is referenced via Link: in the commit message
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<alyssa>
maz: personally i don't see the point of stable backports until the upstream is in a state where people are actually running torvalds' kernels
<alyssa>
I guess theoretically there's enough for a m1 mini server already, but I am aware of 0 people who actually do that with an unpatched upstream kernel :p
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<mischa85>
so the question probably boils down to: how to access the OVRD register?
<sven>
what makes you think that’s the cause?
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<mischa85>
sven: not having any access yet to m1/m2, but while making a clean branch this one turned out to be suspicious. git blaming the m1n1 tree found that original commit mentioning FIQ
<mischa85>
i can read the registers tho: mrs(CYC_OVRD_EL1) = 0x0, mrs(ACC_OVRD_EL1) = 0x1800109000040212, mrs(ACC_EBLK_OVRD_EL1) = 0x8800
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<mischa85>
and msr(CYC_OVRD_EL1,1) gives a sync exception, so the register is indeed unwritable
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<mischa85>
another suggestion found in irc logs are pointing towards the page tables not being set up properly. common issue is the very first instruction failing. it mentions a translation fault which points to page tables setup, but i don't think that's the case here as mmu is deactivated
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