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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<eiln>
what a self-own, there's a semi-enforced iova upper limit .. "vm-size"
<eiln>
considering only dma to L2 fails when in the upper range, i think it's a distance issue ("hint" seems right)
<eiln>
oke back to work :)
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<jannau>
the dart_hw_reset() in runtime resume seems break PCIe. no issues so far after replacing the reset with a restore, i.e. instead of resetting tcr and ttbr it restores the old values and calls invalidate_tlb() only after the values are restored
<jannau>
still looks like the PCI's subsystem understanding of runtime pm is incompatible with powering the iommu down on suspend
<marcan>
the PCIe subsystem doesn't have an understanding of runtime PM
<marcan>
it's not surprising that is broken
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<jannau>
it looked like it uses generic runtime pm callbacks if pci drivers don't have their own callbacks. I stopped looking after that
<kettenis>
if DMA is quiesced before the iommu is powered down, it should work
<kettenis>
but that does mean there is a dependency that needs to be enforced
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<jannau>
hmm, I mistook the quirks for a generic suspend/resume handling so there is no runtime pm the PCIe drivers
<jannau>
I would have expected that the device link / runtime pm code keeps the supplier on in that case
<sven>
bah... and the acio driver is back to resetting the soc *sigh*
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<jannau>
the issue might be that pm_runtime_enable() returns true for the pcie device in dart_probe_device(). sysfs claims that runtime pm is not used for them, but dart_probe_device() is too early to check the device runtime pm status anyway
<jannau>
ugly workaround for now: add DL_FLAG_RPM_ACTIVE if dev_is_pci(dev) is true
<jannau>
I wonder why this is not a problem on other systems. runtime pm in other iommu drivers looks close enough
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<kettenis>
jannau: which other iommu drivers?
<kettenis>
I had a quick look the other day, and the only iommu drivers that seem to do runtime pm are the SoC-specific ones
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<kettenis>
those are basically only used for the GPUs
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<jannau>
yes, the soc specific ones and arm-smmu (not arm-smmu-v3)
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<marcan>
jannau: the problem is probably the same thing I ran into with DCP, that the genpd framework shuts down the PD as soon as *one* device attaches that claims to be RPM aware
<marcan>
which meant that the DART attaching to the DCP power domain before the FB or DCP itself was killing it
<marcan>
my hack with DCP was to set the domain to always on and unset that in the DCP driver
<marcan>
killing the PCIe power domain breaks the init that m1n1 does
<jannau>
pcie works initially, ethernet seems to randomly break when trasmitting data. I think the issue is the reset in the dart resume function
<jannau>
I suspect it resets the dart while the device is in use
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<jannau>
ps_apcie_gp_sys is always-on on t600x so it ought to be the dart reset
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<marcan>
could be, yeah
<jannau>
well, the issue is that the dart is runtime suspended / resumed while the device is in use
<jannau>
but responsible for the breakage is the reset as long as the power domain stays on
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<rmk>
marcan: good bye
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