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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<wens> is it just me or is lore very slow?
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<CounterPillow> it's fast for me
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<epilys> regular speed for me as well
<epilys> Xen reports unknown arm instruction, interesting...
<epilys> (XEN) d22v2 Rn should not be equal to Rt except for r31
<epilys> (XEN) d22v2 unhandled Arm instruction 0x3d800000
<epilys> (XEN) d22v2 Unable to decode instruction
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<epilys> Also unhandled Arm instruction 0xad000400
<epilys> Is there an easy way to see what instruction matches this opcode?
<bjdooks> echo ".text ; .inst 0xad000400" | aarch64-linux-gnu-as -o /tmp/output && aarch64-linux-gnu-objdump -Dr /tmp/output
<bjdooks> 0: ad000400 stp q0, q1, [x0]
<bjdooks> assuming you meant aarch64 and not arm32
<ardb> epilys: those are fp/simd instructions, so they may be trapping because the SIMD unit is disabled
<HdkR> `rasm2 -D -a arm -b 64 -e 0xad000400` -> `stp q0, q1, [x0]`. Also works if you have rasm2 installed which can be handy :)
<epilys> thanks everybody :)
<epilys> I should probably make gcc not emit those instructions...
<epilys> ARCH = armv8.2-a+nosimd+nofp I guess
<ajb-linaro> odd that Xen can't handle simd instructions (although I can guess it doesn't handle SVE yet)
* epilys realizes qemu build needs fp, woops
<epilys> disabling just simd.
<epilys> HdkR: rasm2 is very useful!
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<ajb-linaro> epilys I can run the qemu fcvt test under Xen and that works fine - so I think this might more be about the Xen decoder than the FPU/SIMD being disabled
<ajb-linaro> objdump -d fcvt | grep "stp\s" | grep q | wc -l
<ajb-linaro> 264
<epilys> are they the same stp variants?
<epilys> but in anycase, I just want to not put those instructions in the build rather than debugging xen
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<ajb-linaro> at least 7 of them ;-)
<ajb-linaro> objdump -d fcvt | grep "stp\s" | grep q0 | grep q1 | grep x0 | wc -l
<ajb-linaro> 7
<epilys> hm xen doesn't recognize other stp instructions as well
<epilys> 3d800000 str q0, [x0]
<epilys> ah that's an str
<ajb-linaro> epilys there are two things - does Xen disable FPU/SIMD - which ^ seems to indicate no, and then can Xen handle when using quad load/stores against IO regions which I think is the problem
<ajb-linaro> because most uses of quad load/store will be to RAM and therefor Xen never gets involved
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<ajb-linaro> epilys of course the other question is should we ever being doing a pair load/store to IO space? I suspect that would be unusual behaviour for a driver to write 256 bits to an IO register in one go
<epilys> It happens after a GPU ioctl, if that makes a difference
<epilys> Is this offtopic for this channel by the way?
<NishanthMenon> Before the team goes and bisects things - anyone know of a regression between 0130 and 0131 linux-next ? we see regressions in TI platforms, but see the same in kernelci as well. for other platforms .. https://storage.kernelci.org/next/master/next-20240130/arm64/defconfig/gcc-10/lab-broonie/baseline-bcm2711-rpi-4-b.html#L684
<broonie> That's yesterday's -next not today's? We did see that yesterday, Aishwarya was bisecting it but I don't think she finished/got a good result.
<broonie> But yeah, basically everything is broken..
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<NishanthMenon> thanks broonie :(
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<NishanthMenon> hmm.. cross checking the internal report: you are right, regression did pop up on 0130, i was mistaken it was 0131.
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<broonie> NishanthMenon: Looks like it's working today with our internal tests. Aishwarya says the bisect yesterday was inconclusive.
<NishanthMenon> Sigh.. my kci download script is still flaky.. still picking up yesterday's build.. grr..
<NishanthMenon> thanks broonie.. will manually rebuild and check..
<broonie> KernelCI seems backlogged right now so didn't build today's -next from the looks of it (there are builds from today showing)
<NishanthMenon> aah ok. no worries.. triggered local build.. once i trigger the farm should have results in 20-30 mins or so..
<linusw__> NishanthMenon: out of curiosity: do you have the odd keystone board with very much memory in that test farm?
<NishanthMenon> umm.. let me check
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<NishanthMenon> 3 boards k2g-ice, k2g-evm and k2hk-evm (u-boot k2g-ice is 512MB, k2g-evm is 2G, trying to find k2hk size)..
<NishanthMenon> k2hk is 1G - at least in my logs
<NishanthMenon> sorry linusw__ looks like at least my boards in farm dont..
<linusw__> NishanthMenon: the 2G board and 1G board will at least stress test highmem a bit and that's great.
<linusw__> at least if you put some load on the system.
<NishanthMenon> highmem, sure.. i was'nt sure if you were looking for those massive 32G boards.. :(
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<NishanthMenon> broonie: does'nt look like all is going to be good - https://gist.github.com/nmenon/3ac694aaaba31b099a5aaf1d56c7c974 - 3 boards shows regression (Vs 0125 - last log I have) https://usercontent.irccloud-cdn.com/file/OxeoCyPQ/image.png
<broonie> Oh dear
<broonie> There’s also a pl011 bot break :/
<arnd> NishanthMenon: several other people ran into this as well: https://lore.kernel.org/all/91eacde0-df99-4d5c-a980-91046f66e612@samsung.com/
<arnd> according to roxell, reverting 5797b1c18919 gets you past the workqueue regression
<NishanthMenon> arnd: thanks. Will try.
<arnd> geertu: I see you removed drivers/staging/boards, nice!
<arnd> should we make CONFIG_FB_SH_MOBILE_LCDC superh-only now?
<geertu> arnd: Technically, it still works on ARM
<arnd> geertu: yes, but there is no DT support and no platform_data definition. I think we removed a couple of other fbdev drivers that have a working drm replacement
<geertu> arnd: OK, I will send a patch
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<NishanthMenon> arnd: sorry for the late resp, reverted 5797b1c18919 looks like something else is also pending behind that one.. https://www.irccloud.com/pastebin/HWOZJ2i2/
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