From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@suse.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
Clemens Ladisch <clemens@ladisch.de>,
Ricardo Neri <ricardo.neri@intel.com>,
Stephane Eranian <eranian@google.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ashok Raj <ashok.raj@intel.com>,
x86@kernel.org, Andi Kleen <andi.kleen@intel.com>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Arnd Bergmann <arnd@arndb.de>,
Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
Mimi Zohar <zohar@linux.ibm.com>, Tony Luck <tony.luck@intel.com>,
Randy Dunlap <rdunlap@infradead.org>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
Philippe Ombredanne <pombredanne@nexb.com>,
Nayna Jain <nayna@linux.ibm.com>
Subject: [RFC PATCH v4 16/21] x86/watchdog: Add a shim hardlockup detector
Date: Thu, 23 May 2019 18:16:18 -0700 [thread overview]
Message-ID: <1558660583-28561-17-git-send-email-ricardo.neri-calderon@linux.intel.com> (raw)
In-Reply-To: <1558660583-28561-1-git-send-email-ricardo.neri-calderon@linux.intel.com>
The generic hardlockup detector is based on perf. It also provides a set
of weak stubs that CPU architectures can override. Add a shim hardlockup
detector for x86 that selects between perf and hpet implementations.
Specifically, this shim implementation is needed for the HPET-based
hardlockup detector; it can also be used for future implementations.
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Mimi Zohar <zohar@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Nayna Jain <nayna@linux.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: x86@kernel.org
Suggested-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
---
arch/x86/Kconfig.debug | 4 ++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/watchdog_hld.c | 78 ++++++++++++++++++++++++++++++++++
3 files changed, 83 insertions(+)
create mode 100644 arch/x86/kernel/watchdog_hld.c
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 445bbb188f10..52c77e2145c9 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -169,11 +169,15 @@ config IOMMU_LEAK
config HAVE_MMIOTRACE_SUPPORT
def_bool y
+config X86_HARDLOCKUP_DETECTOR
+ bool
+
config X86_HARDLOCKUP_DETECTOR_HPET
bool "Use HPET Timer for Hard Lockup Detection"
select SOFTLOCKUP_DETECTOR
select HARDLOCKUP_DETECTOR
select HARDLOCKUP_DETECTOR_CORE
+ select X86_HARDLOCKUP_DETECTOR
depends on HPET_TIMER && HPET && X86_64
help
Say y to enable a hardlockup detector that is driven by a High-
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 3ad55de67e8b..e60244b8a8ec 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -106,6 +106,7 @@ obj-$(CONFIG_VM86) += vm86_32.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_HPET_TIMER) += hpet.o
+obj-$(CONFIG_X86_HARDLOCKUP_DETECTOR) += watchdog_hld.o
obj-$(CONFIG_X86_HARDLOCKUP_DETECTOR_HPET) += watchdog_hld_hpet.o
obj-$(CONFIG_APB_TIMER) += apb_timer.o
diff --git a/arch/x86/kernel/watchdog_hld.c b/arch/x86/kernel/watchdog_hld.c
new file mode 100644
index 000000000000..c2512d4c79c5
--- /dev/null
+++ b/arch/x86/kernel/watchdog_hld.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * A shim hardlockup detector. It overrides the weak stubs of the generic
+ * implementation to select between the perf- or the hpet-based implementation.
+ *
+ * Copyright (C) Intel Corporation 2019
+ */
+
+#include <linux/nmi.h>
+#include <asm/hpet.h>
+
+enum x86_hardlockup_detector {
+ X86_HARDLOCKUP_DETECTOR_PERF,
+ X86_HARDLOCKUP_DETECTOR_HPET,
+};
+
+static enum __read_mostly x86_hardlockup_detector detector_type;
+
+int watchdog_nmi_enable(unsigned int cpu)
+{
+ if (detector_type == X86_HARDLOCKUP_DETECTOR_PERF) {
+ hardlockup_detector_perf_enable();
+ return 0;
+ }
+
+ if (detector_type == X86_HARDLOCKUP_DETECTOR_HPET) {
+ hardlockup_detector_hpet_enable(cpu);
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+void watchdog_nmi_disable(unsigned int cpu)
+{
+ if (detector_type == X86_HARDLOCKUP_DETECTOR_PERF) {
+ hardlockup_detector_perf_disable();
+ return;
+ }
+
+ if (detector_type == X86_HARDLOCKUP_DETECTOR_HPET) {
+ hardlockup_detector_hpet_disable(cpu);
+ return;
+ }
+}
+
+int __init watchdog_nmi_probe(void)
+{
+ int ret;
+
+ /*
+ * Try first with the HPET hardlockup detector. It will only
+ * succeed if selected at build time and the nmi_watchdog
+ * command-line parameter is configured. This ensure that the
+ * perf-based detector is used by default, if selected at
+ * build time.
+ */
+ ret = hardlockup_detector_hpet_init();
+ if (!ret) {
+ detector_type = X86_HARDLOCKUP_DETECTOR_HPET;
+ return ret;
+ }
+
+ ret = hardlockup_detector_perf_init();
+ if (!ret) {
+ detector_type = X86_HARDLOCKUP_DETECTOR_PERF;
+ return ret;
+ }
+
+ return ret;
+}
+
+void watchdog_nmi_stop(void)
+{
+ /* Only the HPET lockup detector defines a stop function. */
+ if (detector_type == X86_HARDLOCKUP_DETECTOR_HPET)
+ hardlockup_detector_hpet_stop();
+}
--
2.17.1
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next prev parent reply other threads:[~2019-05-24 1:18 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-24 1:16 [RFC PATCH v4 00/21] Implement an HPET-based hardlockup detector Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 01/21] x86/msi: Add definition for NMI delivery mode Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 02/21] x86/hpet: Expose hpet_writel() in header Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 03/21] x86/hpet: Calculate ticks-per-second in a separate function Ricardo Neri
2019-06-14 15:54 ` Thomas Gleixner
2019-06-14 15:59 ` Thomas Gleixner
2019-06-18 22:48 ` Ricardo Neri
2019-06-18 23:13 ` Thomas Gleixner
2019-05-24 1:16 ` [RFC PATCH v4 04/21] x86/hpet: Add hpet_set_comparator() for periodic and one-shot modes Ricardo Neri
2019-06-14 18:17 ` Thomas Gleixner
2019-06-18 22:48 ` Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 05/21] x86/hpet: Reserve timer for the HPET hardlockup detector Ricardo Neri
2019-06-11 19:54 ` Thomas Gleixner
2019-06-14 1:14 ` Ricardo Neri
2019-06-14 16:10 ` Thomas Gleixner
2019-06-18 22:48 ` Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 06/21] x86/hpet: Configure the timer used by the " Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 07/21] watchdog/hardlockup: Define a generic function to detect hardlockups Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 08/21] watchdog/hardlockup: Decouple the hardlockup detector from perf Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 09/21] x86/nmi: Add a NMI_WATCHDOG NMI handler category Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 10/21] watchdog/hardlockup: Add function to enable NMI watchdog on all allowed CPUs at once Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 11/21] x86/watchdog/hardlockup: Add an HPET-based hardlockup detector Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 12/21] watchdog/hardlockup/hpet: Adjust timer expiration on the number of monitored CPUs Ricardo Neri
2019-06-11 20:11 ` Thomas Gleixner
2019-06-18 22:46 ` Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 13/21] x86/watchdog/hardlockup/hpet: Determine if HPET timer caused NMI Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 14/21] watchdog/hardlockup: Use parse_option_str() to handle "nmi_watchdog" Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 15/21] watchdog/hardlockup/hpet: Only enable the HPET watchdog via a boot parameter Ricardo Neri
2019-05-24 1:16 ` Ricardo Neri [this message]
2019-05-24 1:16 ` [RFC PATCH v4 17/21] x86/tsc: Switch to perf-based hardlockup detector if TSC become unstable Ricardo Neri
2019-06-07 0:35 ` Stephane Eranian via iommu
2019-06-07 14:14 ` Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 18/21] x86/apic: Add a parameter for the APIC delivery mode Ricardo Neri
2019-06-16 9:55 ` Thomas Gleixner
2019-06-18 22:47 ` Ricardo Neri
2019-06-18 23:15 ` Thomas Gleixner
2019-05-24 1:16 ` [RFC PATCH v4 19/21] iommu/vt-d: Rework prepare_irte() to support per-irq " Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 20/21] iommu/vt-d: hpet: Reserve an interrupt remampping table entry for watchdog Ricardo Neri
2019-06-16 18:42 ` Thomas Gleixner
2019-06-16 19:21 ` Thomas Gleixner
2019-06-17 8:25 ` Thomas Gleixner
2019-06-17 21:38 ` Stephane Eranian via iommu
2019-06-17 23:08 ` Thomas Gleixner
2019-06-19 15:43 ` Jacob Pan
2019-06-21 15:33 ` Thomas Gleixner
2019-06-21 17:31 ` Jacob Pan
2019-06-21 18:39 ` Jacob Pan
2019-06-21 20:05 ` Thomas Gleixner
2019-06-21 23:55 ` Ricardo Neri
2019-06-22 7:21 ` Thomas Gleixner
2019-10-18 2:48 ` Ricardo Neri
2019-06-18 22:45 ` Ricardo Neri
2019-05-24 1:16 ` [RFC PATCH v4 21/21] x86/watchdog/hardlockup/hpet: Support interrupt remapping Ricardo Neri
2019-06-16 8:44 ` Thomas Gleixner
2019-06-16 8:53 ` Thomas Gleixner
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