[PATCH v2 0/3] Enable support IPI_CPU_CRASH_STOP to be pseudo-NMI

[ito-yuichi at fujitsu.com]

Hi Marc, Sumit

What should I do to merge this patch.
I would appreciate if you have any advice.

I have not tested it with ThunderX2 yet.

Best regards,

Yuichi Ito

> -----Original Message-----
> From: Yuichi Ito <ito-yuichi at fujitsu.com>
> Sent: Wednesday, November 4, 2020 5:06 PM
> To: maz at kernel.org; sumit.garg at linaro.org; tglx at linutronix.de;
> jason at lakedaemon.net; catalin.marinas at arm.com; will at kernel.org
> Cc: linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org; Ito,
> Yuichi/伊藤 有一 <ito-yuichi at fujitsu.com>
> Subject: [PATCH v2 0/3] Enable support IPI_CPU_CRASH_STOP to be
> pseudo-NMI
> 
> This patchset enables IPI_CPU_CRASH_STOP IPI to be pseudo-NMI.
> This allows kdump to collect system information even when the CPU is in a
> HARDLOCKUP state.
> 
> Only IPI_CPU_CRASH_STOP uses NMI and the other IPIs remain normal
> IRQs.
> 
> The patch has been tested on FX1000.
> 
> It also uses some of Sumit's IPI patch set for NMI.[1]
> 
> [1]
> https://lore.kernel.org/lkml/1603983387-8738-3-git-send-email-sumit.garg@l
> inaro.org/
> 
> $ echo 1 > /proc/sys/kernel/panic_on_rcu_stal
> $ echo HARDLOCKUP > /sys/kernel/debug/provoke-crash/DIRECT
>    : kernel panics and crash kernel boot
>    : makedumpfile saves the system state at HARDLOCKUP in vmcore.
> 
> crash utility:
>  #7 [fffffe00290afd30] lkdtm_HARDLOCKUP at fffffe0010857ee8
>  #8 [fffffe00290afd40] direct_entry at fffffe0010857c94
>  #9 [fffffe00290afd90] full_proxy_write at fffffe001055dea0
> #10 [fffffe00290afdd0] vfs_write at fffffe001047533c
> #11 [fffffe00290afe10] ksys_write at fffffe001047563c
> #12 [fffffe00290afe60] __arm64_sys_write at fffffe00104756e8
> #13 [fffffe00290afe70] do_el0_svc at fffffe00101590cc
> #14 [fffffe00290afea0] el0_svc at fffffe0010147a30
> #15 [fffffe00290afeb0] el0_sync_handler at fffffe001014835c
> #16 [fffffe00290afff0] el0_sync at fffffe0010142c14
> 
> Changes in v1:
> - Rebased to head of upstream master.
> - Rebased to Sumit's latest IPIs patch-set [1].
> 
> [1]
> https://lore.kernel.org/lkml/1603983387-8738-3-git-send-email-sumit.garg@l
> inaro.org/
> 
> - Add conditional branch of local_irq_disable().
> 
> Sumit Garg (1):
>   irqchip/gic-v3: Enable support for SGIs to act as NMIs
> 
> Yuichi Ito (2):
>   arch64: smp: Register IPI_CPU_CRASH_STOP IPI as pseudo-NMI
>   arch64: smp: Disable priority masking when received NMI on PSR.I section
> 
>  arch/arm64/kernel/smp.c      | 44
> +++++++++++++++++++++++++++++++++++---------
>  drivers/irqchip/irq-gic-v3.c | 29 +++++++++++++++++++++--------
>  2 files changed, 56 insertions(+), 17 deletions(-)
> 
> --
> 1.8.3.1