Messages in this thread | | | From | Valentin Schneider <> | Subject | [BUG] hikey960: psci: Failure to boot CPU after hotplug | Date | Sun, 14 Oct 2018 19:00:21 +0100 |
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Hi folks,
I was cleaning up some hotplug torture test, and happened to run that on my HiKey960 which resulted in a failure.
Turns out just a few hotplug operations are needed to trigger this, so I boiled it down to this small script:
for ((i = 0; i < 4; i++)); do echo "OFF $i" echo 0 > /sys/devices/system/cpu/cpu$i/online echo "ON $i" echo 1 > /sys/devices/system/cpu/cpu$i/online echo done
Running this results in:
----->8----- OFF 0 [ 80.819925] CPU0: shutdown [ 80.823851] psci: CPU0 killed. ON 0 [ 80.841609] Detected VIPT I-cache on CPU0 [ 80.845730] CPU0: Booted secondary processor 0x0000000000 [0x410fd034]
OFF 1 [ 80.927340] CPU1: shutdown [ 80.930204] psci: CPU1 killed. ON 1 [ 80.948701] Detected VIPT I-cache on CPU1 [ 80.952810] CPU1: Booted secondary processor 0x0000000001 [0x410fd034]
OFF 2 [ 81.023079] CPU2: shutdown [ 81.026465] psci: CPU2 killed. ON 2 [ 81.036281] Detected VIPT I-cache on CPU2 [ 81.040402] CPU2: Booted secondary processor 0x0000000002 [0x410fd034]
OFF 3 [ 81.103528] CPU3: shutdown [ 81.106382] psci: CPU3 killed. ON 3 [ 81.121835] Detected VIPT I-cache on CPU3 [ 81.125975] CPU3: Booted secondary processor 0x0000000003 [0x410fd034] ----->8-----
Now, if I run this for CPUs [4-7], I eventually get this (takes a few tries):
----->8----- OFF 4 [ 73.149855] CPU4: shutdown [ 73.152628] psci: CPU4 killed. ON 4 [ 73.157491] Detected VIPT I-cache on CPU4 [ 73.161509] CPU features: SANITY CHECK: Unexpected variation in SYS_ID_AA64MMFR0_EL1. Boot CPU: 0x00000000001122, CPU4: 0x00000000101122 [ 73.173813] arch_timer: CPU4: Trapping CNTVCT access [ 73.178782] CPU4: Booted secondary processor 0x0000000100 [0x410fd091]
OFF 5 [ 73.261245] CPU5: shutdown [ 73.264043] psci: CPU5 killed. ON 5 [ 74.272375] CPU5: failed to come online [ 74.276264] CPU5: failed in unknown state : 0x0 ./hotplug.sh: line 8: echo: write error: Input/output error
OFF 6 [ 74.311066] CPU6: shutdown [ 74.313829] psci: CPU6 killed. ON 6 [ 74.318544] Detected VIPT I-cache on CPU6 [ 74.322590] CPU features: SANITY CHECK: Unexpected variation in SYS_ID_AA64MMFR0_EL1. Boot CPU: 0x00000000001122, CPU6: 0x00000000101122 [ 74.334884] arch_timer: CPU6: Trapping CNTVCT access [ 74.339854] CPU6: Booted secondary processor 0x0000000102 [0x410fd091]
OFF 7 [ 74.394989] CPU7: shutdown [ 74.397770] psci: CPU7 killed. ON 7 [ 74.402295] Detected VIPT I-cache on CPU7 [ 74.406475] CPU features: SANITY CHECK: Unexpected variation in SYS_ID_AA64MMFR0_EL1. Boot CPU: 0x00000000001122, CPU7: 0x00000000101122 [ 74.418748] arch_timer: CPU7: Trapping CNTVCT access [ 74.423709] CPU7: Booted secondary processor 0x0000000103 [0x410fd091] ----->8-----
Trying to online CPU5 yet again yields a slightly different result:
----->8----- [ 74.528657] psci: failed to boot CPU5 (-22) [ 74.534577] CPU5: failed to boot: -22 [ 74.538291] CPU5: failed in unknown state : 0x0 ./hotplug.sh: line 8: echo: write error: Invalid argument ----->8-----
It doesn't seem tied to any particular big CPU - I've that happen for 4 & 7. It happens both on mainline (4.19-rc7, 3a27203102eb) and on linux-next (774ea0551a29). I tried bisecting this but it's a bit tricky since the mainline support for HiKey960 is relatively recent - as far as I can tell, that issue has always been there on this board.
I wanted to have a bit of fun and investigate that myself, but psci is alien to me and I don't really know where to look at past "psci_cpu_on()".
I'm running UEFI/ATF on that board, if that's of any help.
Cheers, Valentin
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