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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Marc Zyngier <maz@kernel.org>,
	Lorenzo Colitti <lorenzo@google.com>,
	John Stultz <john.stultz@linaro.org>,
	Stephen Boyd <sboyd@kernel.org>,
	kernel-team@android.com
Subject: [PATCH 5/5] timer_list: Print name of per-cpu wakeup device
Date: Thu, 20 May 2021 19:47:05 +0100	[thread overview]
Message-ID: <20210520184705.10845-6-will@kernel.org> (raw)
In-Reply-To: <20210520184705.10845-1-will@kernel.org>

With the introduction of per-cpu wakeup devices that can be used in
preference to the broadcast timer, print the name of such devices when
they are available.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
---
 kernel/time/tick-broadcast.c |  7 +++++++
 kernel/time/tick-internal.h  |  1 +
 kernel/time/timer_list.c     | 11 ++++++++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index ba5264e210d9..dbafa7d14aff 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -63,6 +63,13 @@ struct cpumask *tick_get_broadcast_mask(void)
 	return tick_broadcast_mask;
 }
 
+static struct clock_event_device *tick_get_oneshot_wakeup_device(int cpu);
+
+const struct clock_event_device *tick_get_wakeup_device(int cpu)
+{
+	return tick_get_oneshot_wakeup_device(cpu);
+}
+
 /*
  * Start the device in periodic mode
  */
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 30c89639e305..6a742a29e545 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -71,6 +71,7 @@ extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadc
 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 extern struct tick_device *tick_get_broadcast_device(void);
 extern struct cpumask *tick_get_broadcast_mask(void);
+extern const struct clock_event_device *tick_get_wakeup_device(int cpu);
 # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
 static inline void tick_install_broadcast_device(struct clock_event_device *dev, int cpu) { }
 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 6939140ab7c5..01158983a335 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -229,6 +229,15 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
 	SEQ_printf(m, "\n");
 	SEQ_printf(m, " retries:        %lu\n", dev->retries);
 	SEQ_printf(m, "\n");
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+	if (cpu >= 0) {
+		const struct clock_event_device *wd =
+			tick_get_wakeup_device(cpu);
+		SEQ_printf(m, "Wakeup Device: %s\n", wd ? wd->name : "<NULL>");
+		SEQ_printf(m, "\n");
+	}
+#endif
 }
 
 static void timer_list_show_tickdevices_header(struct seq_file *m)
@@ -248,7 +257,7 @@ static void timer_list_show_tickdevices_header(struct seq_file *m)
 
 static inline void timer_list_header(struct seq_file *m, u64 now)
 {
-	SEQ_printf(m, "Timer List Version: v0.8\n");
+	SEQ_printf(m, "Timer List Version: v0.9\n");
 	SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
 	SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
 	SEQ_printf(m, "\n");
-- 
2.31.1.818.g46aad6cb9e-goog


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      parent reply	other threads:[~2021-05-20 18:50 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-20 18:47 [PATCH 0/5] tick/broadcast: Allow per-cpu timers to be used instead of broadcast Will Deacon
2021-05-20 18:47 ` [PATCH 1/5] tick/broadcast: Drop unneeded CONFIG_GENERIC_CLOCKEVENTS_BROADCAST guard Will Deacon
2021-05-20 18:47 ` [PATCH 2/5] tick/broadcast: Split __tick_broadcast_oneshot_control() into a helper Will Deacon
2021-05-20 18:47 ` [PATCH 3/5] tick/broadcast: Prefer per-cpu oneshot wakeup timers to broadcast Will Deacon
2021-05-21  2:25   ` Mika Penttilä
2021-05-21 11:25     ` Will Deacon
2021-05-21 12:18       ` Will Deacon
2021-05-21 13:49       ` Thomas Gleixner
2021-05-21 14:43         ` Will Deacon
2021-05-20 18:47 ` [PATCH 4/5] tick/broadcast: Program wakeup timer when entering idle if required Will Deacon
2021-05-20 18:47 ` Will Deacon [this message]

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