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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: Ashok Raj <ashok.raj@intel.com>,
	Andi Kleen <andi.kleen@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	Ricardo Neri <ricardo.neri@intel.com>,
	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Tony Luck <tony.luck@intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Don Zickus <dzickus@redhat.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Frederic Weisbecker <frederic@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Babu Moger <babu.moger@oracle.com>,
	Paul Mackerras <paulus@samba.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Colin Ian King <colin.king@canonical.com>,
	Byungchul Park <byungchul.park@lge.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	"Luis R. Rodriguez" <mcgrof@kernel.org>,
	Waiman Long <longman@redhat.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Christoffer Dall <cdall@linaro.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Kai-Heng Feng <kai.heng.feng@canonical.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	David Rientjes <rientjes@google.com>,
	"David S. Miller" <davem@davemloft.net>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH v2 10/14] kernel/watchdog: Add a function to obtain the watchdog_allowed_mask
Date: Wed, 27 Feb 2019 08:05:14 -0800	[thread overview]
Message-ID: <1551283518-18922-11-git-send-email-ricardo.neri-calderon@linux.intel.com> (raw)
In-Reply-To: <1551283518-18922-1-git-send-email-ricardo.neri-calderon@linux.intel.com>

Implementations of NMI watchdogs that use a single piece of hardware to
monitor all the CPUs in the system (as opposed to per-CPU implementations
such as perf) need to know which CPUs the watchdog is allowed to monitor.
In this manner, non-maskable interrupts are directed only to the monitored
CPUs.

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: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Babu Moger <babu.moger@oracle.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Christoffer Dall <cdall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: x86@kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: sparclinux@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
---
 include/linux/nmi.h | 1 +
 kernel/watchdog.c   | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index bf5ebcfdd590..b563fb6ef21d 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -83,6 +83,7 @@ static inline void reset_hung_task_detector(void) { }
 
 #if defined(CONFIG_HARDLOCKUP_DETECTOR)
 extern void hardlockup_detector_disable(void);
+extern struct cpumask *watchdog_get_allowed_cpumask(void);
 extern unsigned int hardlockup_panic;
 #else
 static inline void hardlockup_detector_disable(void) {}
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 8fbfda94a67b..367aa81294ef 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -44,7 +44,7 @@ int __read_mostly soft_watchdog_user_enabled = 1;
 int __read_mostly watchdog_thresh = 10;
 int __read_mostly nmi_watchdog_available;
 
-struct cpumask watchdog_allowed_mask __read_mostly;
+static struct cpumask watchdog_allowed_mask __read_mostly;
 
 struct cpumask watchdog_cpumask __read_mostly;
 unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask);
@@ -92,6 +92,11 @@ static int __init hardlockup_all_cpu_backtrace_setup(char *str)
 }
 __setup("hardlockup_all_cpu_backtrace=", hardlockup_all_cpu_backtrace_setup);
 # endif /* CONFIG_SMP */
+
+struct cpumask *watchdog_get_allowed_cpumask(void)
+{
+	return &watchdog_allowed_mask;
+}
 #endif /* CONFIG_HARDLOCKUP_DETECTOR */
 
 /*
-- 
2.17.1


  parent reply	other threads:[~2019-02-27 16:06 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-27 16:05 [RFC PATCH v2 00/14] Implement an HPET-based hardlockup detector Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 01/14] x86/msi: Add definition for NMI delivery mode Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 02/14] x86/hpet: Expose more functions to read and write registers Ricardo Neri
2019-03-26 21:00   ` Thomas Gleixner
2019-04-09  2:03     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 03/14] x86/hpet: Calculate ticks-per-second in a separate function Ricardo Neri
2019-03-26 21:03   ` Thomas Gleixner
2019-04-09  2:04     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 04/14] x86/hpet: Reserve timer for the HPET hardlockup detector Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 05/14] x86/hpet: Relocate flag definitions to a header file Ricardo Neri
2019-03-26 21:11   ` Thomas Gleixner
2019-04-09  2:04     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 06/14] x86/hpet: Configure the timer used by the hardlockup detector Ricardo Neri
2019-03-26 21:13   ` Thomas Gleixner
2019-04-09  2:04     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 07/14] watchdog/hardlockup: Define a generic function to detect hardlockups Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 08/14] watchdog/hardlockup: Decouple the hardlockup detector from perf Ricardo Neri
2019-03-26 21:18   ` Thomas Gleixner
2019-04-09  2:05     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 09/14] watchdog/hardlockup: Make arch_touch_nmi_watchdog() to hpet-based implementation Ricardo Neri
2019-02-27 16:17   ` Paul E. McKenney
2019-03-01  1:17     ` Ricardo Neri
2019-03-26 21:20       ` Thomas Gleixner
2019-04-09  2:05         ` Ricardo Neri
2019-02-27 16:05 ` Ricardo Neri [this message]
2019-03-26 21:22   ` [RFC PATCH v2 10/14] kernel/watchdog: Add a function to obtain the watchdog_allowed_mask Thomas Gleixner
2019-04-09  2:05     ` Ricardo Neri
2019-04-09 11:34   ` Peter Zijlstra
2019-04-11  1:15     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 11/14] x86/watchdog/hardlockup: Add an HPET-based hardlockup detector Ricardo Neri
2019-03-26 20:49   ` Thomas Gleixner
2019-04-09  2:02     ` Ricardo Neri
2019-04-09 10:59     ` Peter Zijlstra
2019-04-10  1:13       ` Ricardo Neri
2019-04-05 16:12   ` Suthikulpanit, Suravee
2019-04-09  2:14     ` Ricardo Neri
2019-04-09 11:03   ` Peter Zijlstra
2019-04-10  1:05     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 12/14] x86/watchdog/hardlockup/hpet: Determine if HPET timer caused NMI Ricardo Neri
2019-03-26 20:55   ` Thomas Gleixner
2019-04-09  2:02     ` Ricardo Neri
2019-04-09 11:28   ` Peter Zijlstra
2019-04-10  1:19     ` Ricardo Neri
2019-04-10  7:01       ` Peter Zijlstra
2019-04-11  1:12         ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 13/14] watchdog/hardlockup/hpet: Only enable the HPET watchdog via a boot parameter Ricardo Neri
2019-03-26 21:29   ` Thomas Gleixner
2019-04-09  2:07     ` Ricardo Neri
2019-02-27 16:05 ` [RFC PATCH v2 14/14] x86/watchdog: Add a shim hardlockup detector Ricardo Neri

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