[RFC PATCH v4 10/21] watchdog/hardlockup: Add function to enable NMI watchdog on all allowed CPUs at once

[Ricardo Neri]

When there are more than one implementation of the NMI watchdog, there may
be situations in which switching from one to another is needed (e.g., if
the time-stamp counter becomes unstable, the HPET-based NMI watchdog can
no longer be used.

The perf-based implementation of the hardlockup detector makes use of
various per-CPU variables which are accessed via this_cpu operations.
Hence, each CPU needs to enable its own NMI watchdog if using the perf
implementation.

Add functionality to switch from one NMI watchdog to another and do it
from each allowed CPU.

Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Ashok Raj <ashok.raj at intel.com>
Cc: Andi Kleen <andi.kleen at intel.com>
Cc: Tony Luck <tony.luck at intel.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki at intel.com>
Cc: Don Zickus <dzickus at redhat.com>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Frederic Weisbecker <frederic at kernel.org>
Cc: Alexei Starovoitov <ast at kernel.org>
Cc: Babu Moger <Babu.Moger at amd.com>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
Cc: Masami Hiramatsu <mhiramat at kernel.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Philippe Ombredanne <pombredanne at nexb.com>
Cc: Colin Ian King <colin.king at canonical.com>
Cc: Byungchul Park <byungchul.park at lge.com>
Cc: "Paul E. McKenney" <paulmck at linux.vnet.ibm.com>
Cc: "Luis R. Rodriguez" <mcgrof at kernel.org>
Cc: Waiman Long <longman at redhat.com>
Cc: Josh Poimboeuf <jpoimboe at redhat.com>
Cc: Randy Dunlap <rdunlap at infradead.org>
Cc: Davidlohr Bueso <dave at stgolabs.net>
Cc: Marc Zyngier <marc.zyngier at arm.com>
Cc: Kai-Heng Feng <kai.heng.feng at canonical.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
Cc: David Rientjes <rientjes at google.com>
Cc: Stephane Eranian <eranian at google.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit at amd.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar at intel.com>
Cc: x86 at kernel.org
Cc: sparclinux at vger.kernel.org
Cc: linuxppc-dev at lists.ozlabs.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon at linux.intel.com>
---
 include/linux/nmi.h |  2 ++
 kernel/watchdog.c   | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index e5f1a86e20b7..6d828334348b 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -83,9 +83,11 @@ static inline void reset_hung_task_detector(void) { }
 
 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
 extern void hardlockup_detector_disable(void);
+extern void hardlockup_start_all(void);
 extern unsigned int hardlockup_panic;
 #else
 static inline void hardlockup_detector_disable(void) {}
+static inline void hardlockup_start_all(void) {}
 #endif
 
 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 7f9e7b9306fe..be589001200a 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -566,6 +566,21 @@ int lockup_detector_offline_cpu(unsigned int cpu)
 	return 0;
 }
 
+static int hardlockup_start_fn(void *data)
+{
+	watchdog_nmi_enable(smp_processor_id());
+	return 0;
+}
+
+void hardlockup_start_all(void)
+{
+	int cpu;
+
+	cpumask_copy(&watchdog_allowed_mask, &watchdog_cpumask);
+	for_each_cpu(cpu, &watchdog_allowed_mask)
+		smp_call_on_cpu(cpu, hardlockup_start_fn, NULL, false);
+}
+
 static void lockup_detector_reconfigure(void)
 {
 	cpus_read_lock();
-- 
2.17.1