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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<maz>
HdkR: not really. WFE really isn't supposed to do anything that is observable by the EL3 firmware. your best bet is to look for a PMU event instead.
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<HdkR>
maz: Interesting PSCI states that WFE and WFI put the core in standby state (out of run, standby, retention, and shutdown), and that STAT_RESIDENCY has the microseconds the core has been in whichever state. Is that not queryable?
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<HdkR>
Although also apparently that stat is optional in 1.0 spec
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<ardb>
arnd: do you have a link to the binutils change that broke things re segment alignment?
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<ardb>
arnd: is it the one by alan modra regarding some relro weaknesses?
<ardb>
arnd: found it nvm
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<maz>
HdkR: I suspect that this would only be updated if either the PSCI implementation trapped WFx, or it itself used a PMU counter to compute the value.
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<HdkR>
maz: Gross. Definitely don't want to trap WFx{t,}
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<robmur01>
isn't the point that WFE standby is *not* a PSCI state, because it can be executed directly?
<HdkR>
Dunno, maybe PSCI is conflating something by bringing up WFE and WFI explicitly
<HdkR>
`Standby: The core is powered up, but measures are employed to reduce energy consumption. In a typical implementation, the core enters standby by executing a WFI or WFE instruction and exits on a corresponding wakeup event.`
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