diff options
| author | Douglas Anderson <dianders@chromium.org> | 2023-05-19 20:18:39 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-10 03:44:21 +0300 |
| commit | b17aa959330e8058452297049a0056ba4b9c72e8 (patch) | |
| tree | d3d65e168a73a0a25f12b6b16366eba35d0c88dc | |
| parent | 1f423c905a6b43b493df1b259e6e6267e5624e62 (diff) | |
| download | linux-b17aa959330e8058452297049a0056ba4b9c72e8.tar.xz | |
watchdog/perf: add a weak function for an arch to detect if perf can use NMIs
On arm64, NMI support needs to be detected at runtime. Add a weak
function to the perf hardlockup detector so that an architecture can
implement it to detect whether NMIs are available.
Link: https://lkml.kernel.org/r/20230519101840.v5.15.Ic55cb6f90ef5967d8aaa2b503a4e67c753f64d3a@changeid
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Colin Cross <ccross@android.com>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Lecopzer Chen <lecopzer.chen@mediatek.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Pingfan Liu <kernelfans@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: Ricardo Neri <ricardo.neri@intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Sumit Garg <sumit.garg@linaro.org>
Cc: Tzung-Bi Shih <tzungbi@chromium.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/nmi.h | 1 | ||||
| -rw-r--r-- | kernel/watchdog_perf.c | 12 |
2 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h index 1cdadc6a6cfd..28e65fd1de13 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -208,6 +208,7 @@ static inline bool trigger_single_cpu_backtrace(int cpu) #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF u64 hw_nmi_get_sample_period(int watchdog_thresh); +bool arch_perf_nmi_is_available(void); #endif #if defined(CONFIG_HARDLOCKUP_CHECK_TIMESTAMP) && \ diff --git a/kernel/watchdog_perf.c b/kernel/watchdog_perf.c index 349fcd4d2abc..8ea00c4a24b2 100644 --- a/kernel/watchdog_perf.c +++ b/kernel/watchdog_perf.c @@ -234,12 +234,22 @@ void __init hardlockup_detector_perf_restart(void) } } +bool __weak __init arch_perf_nmi_is_available(void) +{ + return true; +} + /** * watchdog_hardlockup_probe - Probe whether NMI event is available at all */ int __init watchdog_hardlockup_probe(void) { - int ret = hardlockup_detector_event_create(); + int ret; + + if (!arch_perf_nmi_is_available()) + return -ENODEV; + + ret = hardlockup_detector_event_create(); if (ret) { pr_info("Perf NMI watchdog permanently disabled\n"); |