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From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	Will Deacon <will@kernel.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: [PATCH 2/2] clocksource/drivers/exynos_mct: Mark MCT device as CLOCK_EVT_FEAT_PERCPU
Date: Tue,  8 Jun 2021 16:43:41 +0100	[thread overview]
Message-ID: <20210608154341.10794-3-will@kernel.org> (raw)
In-Reply-To: <20210608154341.10794-1-will@kernel.org>

The "mct_tick" is a per-cpu clockevents device. Set the
CLOCK_EVT_FEAT_PERCPU feature to prevent e.g. mct_tick0 being unsafely
designated as the global broadcast timer and instead treat the device as
a per-cpu wakeup timer.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
 drivers/clocksource/exynos_mct.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 804d3e01c8f4..5e3e96d3d1b9 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -465,7 +465,8 @@ static int exynos4_mct_starting_cpu(unsigned int cpu)
 	evt->set_state_oneshot = set_state_shutdown;
 	evt->set_state_oneshot_stopped = set_state_shutdown;
 	evt->tick_resume = set_state_shutdown;
-	evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
+	evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
+			CLOCK_EVT_FEAT_PERCPU;
 	evt->rating = MCT_CLKEVENTS_RATING,
 
 	exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET);
-- 
2.32.0.rc1.229.g3e70b5a671-goog


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WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
	Will Deacon <will@kernel.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: [PATCH 2/2] clocksource/drivers/exynos_mct: Mark MCT device as CLOCK_EVT_FEAT_PERCPU
Date: Tue,  8 Jun 2021 16:43:41 +0100	[thread overview]
Message-ID: <20210608154341.10794-3-will@kernel.org> (raw)
In-Reply-To: <20210608154341.10794-1-will@kernel.org>

The "mct_tick" is a per-cpu clockevents device. Set the
CLOCK_EVT_FEAT_PERCPU feature to prevent e.g. mct_tick0 being unsafely
designated as the global broadcast timer and instead treat the device as
a per-cpu wakeup timer.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
 drivers/clocksource/exynos_mct.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 804d3e01c8f4..5e3e96d3d1b9 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -465,7 +465,8 @@ static int exynos4_mct_starting_cpu(unsigned int cpu)
 	evt->set_state_oneshot = set_state_shutdown;
 	evt->set_state_oneshot_stopped = set_state_shutdown;
 	evt->tick_resume = set_state_shutdown;
-	evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
+	evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
+			CLOCK_EVT_FEAT_PERCPU;
 	evt->rating = MCT_CLKEVENTS_RATING,
 
 	exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET);
-- 
2.32.0.rc1.229.g3e70b5a671-goog


  parent reply	other threads:[~2021-06-08 15:47 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08 15:43 [PATCH 0/2] Use Exynos-MCT timer as wakeup for Arm arch timer Will Deacon
2021-06-08 15:43 ` Will Deacon
2021-06-08 15:43 ` [PATCH 1/2] clocksource/drivers/exynos_mct: Prioritise Arm arch timer on arm64 Will Deacon
2021-06-08 15:43   ` Will Deacon
2021-06-09 11:41   ` Krzysztof Kozlowski
2021-06-09 11:41     ` Krzysztof Kozlowski
2021-06-10  1:03   ` Chanwoo Choi
2021-06-10  1:03     ` Chanwoo Choi
2021-06-16 15:25     ` Daniel Lezcano
2021-06-16 15:25       ` Daniel Lezcano
2021-06-17  0:58       ` Chanwoo Choi
2021-06-17  0:58         ` Chanwoo Choi
2021-06-17 21:47         ` Will Deacon
2021-06-17 21:47           ` Will Deacon
2021-06-21  9:25           ` Daniel Lezcano
2021-06-21  9:25             ` Daniel Lezcano
2021-06-21 10:10             ` Will Deacon
2021-06-21 10:10               ` Will Deacon
2021-06-21 10:18               ` Daniel Lezcano
2021-06-21 10:18                 ` Daniel Lezcano
2021-06-22  2:40                 ` Chanwoo Choi
2021-06-22  2:40                   ` Chanwoo Choi
2021-06-22  5:21                   ` Daniel Lezcano
2021-06-22  5:21                     ` Daniel Lezcano
2021-06-22  6:42                     ` Chanwoo Choi
2021-06-22  6:42                       ` Chanwoo Choi
2021-06-21 10:17             ` Marek Szyprowski
2021-06-21 10:17               ` Marek Szyprowski
2021-06-21 10:24               ` Daniel Lezcano
2021-06-21 10:24                 ` Daniel Lezcano
2021-08-26 16:25   ` [tip: timers/core] " tip-bot2 for Will Deacon
2021-06-08 15:43 ` Will Deacon [this message]
2021-06-08 15:43   ` [PATCH 2/2] clocksource/drivers/exynos_mct: Mark MCT device as CLOCK_EVT_FEAT_PERCPU Will Deacon
2021-06-09 11:41   ` Krzysztof Kozlowski
2021-06-09 11:41     ` Krzysztof Kozlowski
2021-06-17  0:59   ` Chanwoo Choi
2021-06-17  0:59     ` Chanwoo Choi
2021-08-26 16:25   ` [tip: timers/core] " tip-bot2 for Will Deacon

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