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Date: Wed, 19 Apr 2023 15:55:54 -0700
From: Douglas Anderson <dianders@...omium.org>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Sumit Garg <sumit.garg@...aro.org>,
Daniel Thompson <daniel.thompson@...aro.org>,
Marc Zyngier <maz@...nel.org>,
Mark Rutland <mark.rutland@....com>
Cc: ito-yuichi@...itsu.com, kgdb-bugreport@...ts.sourceforge.net,
Chen-Yu Tsai <wens@...e.org>,
Masayoshi Mizuma <msys.mizuma@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Ard Biesheuvel <ardb@...nel.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
linux-arm-kernel@...ts.infradead.org,
Stephen Boyd <swboyd@...omium.org>,
Lecopzer Chen <lecopzer.chen@...iatek.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-perf-users@...r.kernel.org,
Douglas Anderson <dianders@...omium.org>,
Alexandru Elisei <alexandru.elisei@....com>,
Andrey Konovalov <andreyknvl@...il.com>,
Ben Dooks <ben-linux@...ff.org>,
Borislav Petkov <bp@...en8.de>,
Christophe Leroy <christophe.leroy@...roup.eu>,
"Darrick J. Wong" <djwong@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"David S. Miller" <davem@...emloft.net>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Frederic Weisbecker <frederic@...nel.org>,
Gaosheng Cui <cuigaosheng1@...wei.com>,
"Gautham R. Shenoy" <gautham.shenoy@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
Huacai Chen <chenhuacai@...nel.org>,
Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
"Jason A. Donenfeld" <Jason@...c4.com>,
Jason Wessel <jason.wessel@...driver.com>,
Jianmin Lv <lvjianmin@...ngson.cn>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
Jinyang He <hejinyang@...ngson.cn>,
Joey Gouly <joey.gouly@....com>,
Kees Cook <keescook@...omium.org>,
Laurent Dufour <ldufour@...ux.ibm.com>,
Masahiro Yamada <masahiroy@...nel.org>,
Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Philippe Mathieu-Daudé <f4bug@...at.org>,
Pierre Gondois <Pierre.Gondois@....com>,
Qing Zhang <zhangqing@...ngson.cn>,
"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
Russell King <linux@...linux.org.uk>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Ulf Hansson <ulf.hansson@...aro.org>,
WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
loongarch@...ts.linux.dev, sparclinux@...r.kernel.org,
x86@...nel.org
Subject: [PATCH v8 00/10] arm64: Add framework to turn an IPI as NMI
This is an attempt to resurrect Sumit's old patch series [1] that
allowed us to use the arm64 pseudo-NMI to get backtraces of CPUs and
also to round up CPUs in kdb/kgdb. The last post from Sumit that I
could find was v7, so I called this series v8. I haven't copied all of
his old changelongs here, but you can find them from the link.
Since v7, I have:
* Addressed the small amount of feedback that was there for v7.
* Rebased.
* Added a new patch that prevents us from spamming the logs with idle
tasks.
* Added an extra patch to gracefully fall back to regular IPIs if
pseudo-NMIs aren't there.
Since there appear to be a few different patches series related to
being able to use NMIs to get stack traces of crashed systems, let me
try to organize them to the best of my understanding:
a) This series. On its own, a) will (among other things) enable stack
traces of all running processes with the soft lockup detector if
you've enabled the sysctl "kernel.softlockup_all_cpu_backtrace". On
its own, a) doesn't give a hard lockup detector.
b) A different recently-posted series [2] that adds a hard lockup
detector based on perf. On its own, b) gives a stack crawl of the
locked up CPU but no stack crawls of other CPUs (even if they're
locked too). Together with a) + b) we get everything (full lockup
detect, full ability to get stack crawls).
c) The old Android "buddy" hard lockup detector [3] that I'm
considering trying to upstream. If b) lands then I believe c) would
be redundant (at least for arm64). c) on its own is really only
useful on arm64 for platforms that can print CPU_DBGPCSR somehow
(see [4]). a) + c) is roughly as good as a) + b).
[1] https://lore.kernel.org/linux-arm-kernel/1604317487-14543-1-git-send-email-sumit.garg@linaro.org/
[2] https://lore.kernel.org/linux-arm-kernel/20220903093415.15850-1-lecopzer.chen@mediatek.com/
[3] https://issuetracker.google.com/172213097
[4] https://issuetracker.google.com/172213129
Changes in v8:
- dynamic_ipi_setup() and dynamic_ipi_teardown() no longer take cpu param
- dynamic_ipi_setup() and dynamic_ipi_teardown() no longer take cpu param
- Add loongarch support, too
- Removed "#ifdef CONFIG_SMP" since arm64 is always SMP
- "Tag the arm64 idle functions as __cpuidle" new for v8
- "Provide a stub kgdb_nmicallback() if !CONFIG_KGDB" new for v8
- "Fallback to a regular IPI if NMI isn't enabled" new for v8
Douglas Anderson (3):
arm64: idle: Tag the arm64 idle functions as __cpuidle
kgdb: Provide a stub kgdb_nmicallback() if !CONFIG_KGDB
arm64: ipi_nmi: Fallback to a regular IPI if NMI isn't enabled
Sumit Garg (7):
arm64: Add framework to turn IPI as NMI
irqchip/gic-v3: Enable support for SGIs to act as NMIs
arm64: smp: Assign and setup an IPI as NMI
nmi: backtrace: Allow runtime arch specific override
arm64: ipi_nmi: Add support for NMI backtrace
kgdb: Expose default CPUs roundup fallback mechanism
arm64: kgdb: Roundup cpus using IPI as NMI
arch/arm/include/asm/irq.h | 2 +-
arch/arm/kernel/smp.c | 3 +-
arch/arm64/include/asm/irq.h | 4 ++
arch/arm64/include/asm/nmi.h | 17 +++++
arch/arm64/kernel/Makefile | 2 +-
arch/arm64/kernel/idle.c | 4 +-
arch/arm64/kernel/ipi_nmi.c | 103 +++++++++++++++++++++++++++++++
arch/arm64/kernel/kgdb.c | 18 ++++++
arch/arm64/kernel/smp.c | 8 +++
arch/loongarch/include/asm/irq.h | 2 +-
arch/loongarch/kernel/process.c | 3 +-
arch/mips/include/asm/irq.h | 2 +-
arch/mips/kernel/process.c | 3 +-
arch/powerpc/include/asm/nmi.h | 2 +-
arch/powerpc/kernel/stacktrace.c | 3 +-
arch/sparc/include/asm/irq_64.h | 2 +-
arch/sparc/kernel/process_64.c | 4 +-
arch/x86/include/asm/irq.h | 2 +-
arch/x86/kernel/apic/hw_nmi.c | 3 +-
drivers/irqchip/irq-gic-v3.c | 29 ++++++---
include/linux/kgdb.h | 13 ++++
include/linux/nmi.h | 12 ++--
kernel/debug/debug_core.c | 8 ++-
23 files changed, 217 insertions(+), 32 deletions(-)
create mode 100644 arch/arm64/include/asm/nmi.h
create mode 100644 arch/arm64/kernel/ipi_nmi.c
--
2.40.0.634.g4ca3ef3211-goog
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