#armlinux on 2024-08-19 — irc logs at libera.irclog.whitequark.org

2021-05-27 16:22 ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux

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11:05 <Xogium> I'm hitting this all of a sudden on my system where I toed with my iwd config a little (changing wifi chip used to connect to network). I never had this before though. My lowerdir is squashfs and my upperdir is ext4

11:05 <Xogium> overlayfs: invalid origin (iwd/sfra330.psk, ftype=8000, origin ftype=4000).

11:05 <Xogium> what does that mean ?

11:06 <Xogium> *toyed

11:07 <Xogium> looks like it took the upper origin one without a problem though, as /var/lib/iwd/sfra330.psk has its content, not the one from the initial squashfs

11:07 <Xogium> so why the complain ?

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13:26 <marc|gonzalez> robmur01: in the SMMU spec, is it architecturally guaranteed that smmu->num_mapping_groups >= smmu->num_context_banks ?

13:42 <marc|gonzalez> In other words, what do you think of a work-around along the lines of

13:42 <marc|gonzalez> if (smmu->num_context_banks > smmu->num_mapping_groups)

13:42 <marc|gonzalez> smmu->num_context_banks = smmu->num_mapping_groups;

13:42 <marc|gonzalez> (I have no idea if this makes any sense)

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15:08 <robmur01> marc|gonzalez: not at all, consider that nested S1+S2 translation requires chaining 2 CBs together

15:09 <robmur01> and there could be usage models for switching a stream between different CBs at the same stage, it's just that *Linux* doesn't do that

15:11 <robmur01> (well, apart from the existing bypass hack around yet more qcom brokenness)

15:18 <marc|gonzalez> robmur01: I made my questions clearer in the email thread. Could you also reply there?

15:18 <marc|gonzalez> I find it icky to have code doing if (smmu->num_context_banks == 13) smmu->num_context_banks = 12;

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15:27 <marc|gonzalez> I still remember the QCOM_DUMMY_VAL silliness...

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