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[Bug 1589704] Re: workaround cavium thunderx silicon erratum 23144


I rebuilt d-i against the kernel in proposed and booted it a couple of
times. I have not reproduced this issue, so marking it verified.

~ # uname -a
Linux cvm3 4.4.0-25-generic #44-Ubuntu SMP Fri Jun 10 18:15:04 UTC 2016 aarch64 GNU/Linux
~ # dmesg | grep -i soft
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-di root=UUID=bc611283-1f38-4993-a2b9-883922c7ed1f ro earlycon=pl011,0x87e024000000 hardlockup_all_cpu_backtrace=1 softlockup_all_cpu_backtrace=1 earlycon=pl011,0x87e024000000 apt-setup/proposed=true
[    0.000000] software IO TLB [mem 0xfbfed000-0xfffed000] (64MB) mapped at [ffff8000fb1ed000-ffff8000ff1ecfff]
[    0.229859] CPU features: detected feature: Software prefetching using PRFM
[  174.913338] xor: measuring software checksum speed

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  workaround cavium thunderx silicon erratum 23144

Status in linux package in Ubuntu:
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  This impacts 2 socket Cavium ThunderX systems using pass-1.1 silicon, and can result in IO hangs.

  [Test Case]
  $ dmesg | grep "ITS command queue timeout"

  [Regression Risk]
  The workaround is in gicv3 specific code, and only activated when the hw revision in the IIDR matches ThunderX pass 1.x silicon, so risk to other platforms is minimal.

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