On Tue, Oct 29, 2024 at 04:43:39PM +0100, Jan Stancek wrote:

On Tue, Oct 29, 2024 at 4:07 PM Zi Yan [off-list ref] wrote:

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+tegra mailing list and maintainers

On 29 Oct 2024, at 8:47, Jan Stancek wrote:

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Hi,

I'm seeing a regression on Nvidia IGX system, which no longer boots.

bisect points at commit 767507654c22 ("arch_numa: switch over to numa_memblks").
It hangs very early, with 4k or 64k pages, with no kernel messages printed:

EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services...
<hangs here>

Is it possible to have earlycon output? It is hard to debug without any
information except kernel fails to boot.

I know it was a long shot, so far I haven't had luck getting it to work.

Does it boot with numa=off and numa=fake?

In the log from successful boot it seems there is no NUMA information in
the device tree, can you send the device tree as well please?

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Since the previous commit boots and I assume both kernels are compiled
with the same gcc toolchain, this should not be caused by the binuils
bug in 2.42[1]. Is your binutils version 2.42?

Yes, both are compiled locally, with binutils 2.41

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Thanks.


[1] https://sourceware.org/bugzilla/show_bug.cgi?id=31924

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Here's a log from successful boot with previous commit:
https://people.redhat.com/jstancek/aarch64_numa_boot/console-log-good.txt
and config: https://people.redhat.com/jstancek/aarch64_numa_boot/config

# lscpu
Architecture:             aarch64
  CPU op-mode(s):         32-bit, 64-bit
  Byte Order:             Little Endian
CPU(s):                   12
  On-line CPU(s) list:    0-11
Vendor ID:                ARM
  BIOS Vendor ID:         NVIDIA
  Model name:             Cortex-A78AE
    BIOS Model name:      Not Specified Not Specified CPU @ 0.0GHz
    BIOS CPU family:      257
    Model:                1
    Thread(s) per core:   1
    Core(s) per cluster:  12
    Socket(s):            1
    Cluster(s):           1
    Stepping:             r0p1
    CPU(s) scaling MHz:   100%
    CPU max MHz:          1971.2000
    CPU min MHz:          115.2000
    BogoMIPS:             62.50
    Flags:                fp asimd evtstrm aes pmull sha1 sha2 crc32
atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp uscat ilrcpc
flagm paca pacg
Caches (sum of all):
  L1d:                    768 KiB (12 instances)
  L1i:                    768 KiB (12 instances)
  L2:                     3 MiB (12 instances)
  L3:                     6 MiB (3 instances)
NUMA:
  NUMA node(s):           1
  NUMA node0 CPU(s):      0-11
Vulnerabilities:
  Gather data sampling:   Not affected
  Itlb multihit:          Not affected
  L1tf:                   Not affected
  Mds:                    Not affected
  Meltdown:               Not affected
  Mmio stale data:        Not affected
  Reg file data sampling: Not affected
  Retbleed:               Not affected
  Spec rstack overflow:   Not affected
  Spec store bypass:      Mitigation; Speculative Store Bypass
disabled via prctl
  Spectre v1:             Mitigation; __user pointer sanitization
  Spectre v2:             Mitigation; CSV2, BHB
  Srbds:                  Not affected
  Tsx async abort:        Not affected

Regards,
Jan

Best Regards,
Yan, Zi

-- 
Sincerely yours,
Mike.