linux-kernel - [PATCH 2/3] clocksource/drivers/timer-clint: Add set_state

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Message-ID: <20240327153502.2133-3-jszhang@kernel.org>
Date: Wed, 27 Mar 2024 23:35:01 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] clocksource/drivers/timer-clint: Add set_state_shutdown

Add clocksource detach/shutdown callback to disable RISC-V timer interrupt when
switching out clockevent from clint timer to another timer.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 drivers/clocksource/timer-clint.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/timer-clint.c b/drivers/clocksource/timer-clint.c
index 09fd292eb83d..56cf6c672e6d 100644
--- a/drivers/clocksource/timer-clint.c
+++ b/drivers/clocksource/timer-clint.c
@@ -119,11 +119,21 @@ static int clint_clock_next_event(unsigned long delta,
 	return 0;
 }
 
+static int clint_clock_shutdown(struct clock_event_device *evt)
+{
+	void __iomem *r = clint_timer_cmp +
+			  cpuid_to_hartid_map(smp_processor_id());
+
+	writeq_relaxed(ULONG_MAX, r);
+	return 0;
+}
+
 static DEFINE_PER_CPU(struct clock_event_device, clint_clock_event) = {
-	.name		= "clint_clockevent",
-	.features	= CLOCK_EVT_FEAT_ONESHOT,
-	.rating		= 100,
-	.set_next_event	= clint_clock_next_event,
+	.name				= "clint_clockevent",
+	.features			= CLOCK_EVT_FEAT_ONESHOT,
+	.rating				= 100,
+	.set_next_event			= clint_clock_next_event,
+	.set_state_shutdown		= clint_clock_shutdown,
 };
 
 static int clint_timer_starting_cpu(unsigned int cpu)
-- 
2.43.0