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Date: Thu, 14 Oct 2021 10:41:51 +0800 From: Pingfan Liu <kernelfans@...il.com> To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: Pingfan Liu <kernelfans@...il.com>, Sumit Garg <sumit.garg@...aro.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>, Marc Zyngier <maz@...nel.org>, Kees Cook <keescook@...omium.org>, Masahiro Yamada <masahiroy@...nel.org>, Sami Tolvanen <samitolvanen@...gle.com>, Petr Mladek <pmladek@...e.com>, Andrew Morton <akpm@...ux-foundation.org>, Wang Qing <wangqing@...o.com>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, Santosh Sivaraj <santosh@...six.org> Subject: [PATCHv3 0/4] watchdog_hld cleanup and async model for arm64 Hard lockup detector is helpful to diagnose unpaired irq enable/disable. But the current watchdog framework can not cope with arm64 hw perf event easily. On arm64, when lockup_detector_init()->watchdog_nmi_probe(), PMU is not ready until device_initcall(armv8_pmu_driver_init). And it is deeply integrated with the driver model and cpuhp. Hence it is hard to push the initialization of armv8_pmu_driver_init() before smp_init(). But it is easy to take an opposite approach by enabling watchdog_hld to get the capability of PMU async. The async model is achieved by expanding watchdog_nmi_probe() with -EBUSY, and a re-initializing work_struct which waits on a wait_queue_head. In this series, [1-2/4] are trivial cleanup. [3-4/4] is for this async model. v2 -> v3: check the delay work waken up and flush the work before __initdata is free. improve the commit log of [4/4] rebase to v5.15-rc5 v1 > v2: uplift the async model from hard lockup layer to watchdog layter. The benefit is simpler code, the drawback is re-initialize means wasted alloc/free. Cc: Sumit Garg <sumit.garg@...aro.org> Cc: Catalin Marinas <catalin.marinas@....com> Cc: Will Deacon <will@...nel.org> Cc: Ingo Molnar <mingo@...hat.com> Cc: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: Mark Rutland <mark.rutland@....com> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com> Cc: Jiri Olsa <jolsa@...hat.com> Cc: Namhyung Kim <namhyung@...nel.org> Cc: Marc Zyngier <maz@...nel.org> Cc: Kees Cook <keescook@...omium.org> Cc: Masahiro Yamada <masahiroy@...nel.org> Cc: Sami Tolvanen <samitolvanen@...gle.com> Cc: Petr Mladek <pmladek@...e.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Wang Qing <wangqing@...o.com> Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org> Cc: Santosh Sivaraj <santosh@...six.org> To: linux-arm-kernel@...ts.infradead.org To: linux-kernel@...r.kernel.org *** BLURB HERE *** Pingfan Liu (3): kernel/watchdog: trival cleanups kernel/watchdog_hld: Ensure CPU-bound context when creating hardlockup detector event kernel/watchdog: Adapt the watchdog_hld interface for async model Sumit Garg (1): arm64: Enable perf events based hard lockup detector arch/arm64/Kconfig | 2 ++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/perf_event.c | 11 ++++-- arch/arm64/kernel/watchdog_hld.c | 36 +++++++++++++++++++ arch/sparc/kernel/nmi.c | 8 ++--- drivers/perf/arm_pmu.c | 5 +++ include/linux/nmi.h | 11 +++++- include/linux/perf/arm_pmu.h | 2 ++ kernel/watchdog.c | 62 ++++++++++++++++++++++++++++---- kernel/watchdog_hld.c | 5 ++- 10 files changed, 129 insertions(+), 14 deletions(-) create mode 100644 arch/arm64/kernel/watchdog_hld.c -- 2.31.1
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