[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20201104080539.3205889-1-ito-yuichi@fujitsu.com>
Date: Wed, 4 Nov 2020 17:05:36 +0900
From: Yuichi Ito <ito-yuichi@...itsu.com>
To: maz@...nel.org, sumit.garg@...aro.org, tglx@...utronix.de,
jason@...edaemon.net, catalin.marinas@....com, will@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Yuichi Ito <ito-yuichi@...itsu.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@linaro.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@linaro.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
Powered by blists - more mailing lists