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From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	kernel-team@android.com, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3] arm64: arch_timer: Allow an workaround descriptor to provide vdso_clock_mode
Date: Wed,  1 Jul 2020 17:18:23 +0100	[thread overview]
Message-ID: <20200701161824.1346732-3-maz@kernel.org> (raw)
In-Reply-To: <20200701161824.1346732-1-maz@kernel.org>

As we are about to disable the vdso for compat tasks in some circumstances,
let's allow a workaround descriptor to provide the vdso_clock_mode that
matches the platform.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/arch_timer.h  | 3 +++
 drivers/clocksource/arm_arch_timer.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
index 7ae54d7d333a..fb8dfcbf9c01 100644
--- a/arch/arm64/include/asm/arch_timer.h
+++ b/arch/arm64/include/asm/arch_timer.h
@@ -18,6 +18,8 @@
 #include <linux/smp.h>
 #include <linux/types.h>
 
+#include <vdso/clocksource.h>
+
 #include <clocksource/arm_arch_timer.h>
 
 #if IS_ENABLED(CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND)
@@ -58,6 +60,7 @@ struct arch_timer_erratum_workaround {
 	u64 (*read_cntvct_el0)(void);
 	int (*set_next_event_phys)(unsigned long, struct clock_event_device *);
 	int (*set_next_event_virt)(unsigned long, struct clock_event_device *);
+	enum vdso_clock_mode vdso_clock_mode;
 };
 
 DECLARE_PER_CPU(const struct arch_timer_erratum_workaround *,
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index ecf7b7db2d05..f828835c568f 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -566,6 +566,9 @@ void arch_timer_enable_workaround(const struct arch_timer_erratum_workaround *wa
 	if (wa->read_cntvct_el0) {
 		clocksource_counter.vdso_clock_mode = VDSO_CLOCKMODE_NONE;
 		vdso_default = VDSO_CLOCKMODE_NONE;
+	} else {
+		clocksource_counter.vdso_clock_mode = wa->vdso_clock_mode;
+		vdso_default = wa->vdso_clock_mode;
 	}
 }
 
-- 
2.27.0


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WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, kernel-team@android.com
Subject: [PATCH 2/3] arm64: arch_timer: Allow an workaround descriptor to provide vdso_clock_mode
Date: Wed,  1 Jul 2020 17:18:23 +0100	[thread overview]
Message-ID: <20200701161824.1346732-3-maz@kernel.org> (raw)
In-Reply-To: <20200701161824.1346732-1-maz@kernel.org>

As we are about to disable the vdso for compat tasks in some circumstances,
let's allow a workaround descriptor to provide the vdso_clock_mode that
matches the platform.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/arch_timer.h  | 3 +++
 drivers/clocksource/arm_arch_timer.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
index 7ae54d7d333a..fb8dfcbf9c01 100644
--- a/arch/arm64/include/asm/arch_timer.h
+++ b/arch/arm64/include/asm/arch_timer.h
@@ -18,6 +18,8 @@
 #include <linux/smp.h>
 #include <linux/types.h>
 
+#include <vdso/clocksource.h>
+
 #include <clocksource/arm_arch_timer.h>
 
 #if IS_ENABLED(CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND)
@@ -58,6 +60,7 @@ struct arch_timer_erratum_workaround {
 	u64 (*read_cntvct_el0)(void);
 	int (*set_next_event_phys)(unsigned long, struct clock_event_device *);
 	int (*set_next_event_virt)(unsigned long, struct clock_event_device *);
+	enum vdso_clock_mode vdso_clock_mode;
 };
 
 DECLARE_PER_CPU(const struct arch_timer_erratum_workaround *,
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index ecf7b7db2d05..f828835c568f 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -566,6 +566,9 @@ void arch_timer_enable_workaround(const struct arch_timer_erratum_workaround *wa
 	if (wa->read_cntvct_el0) {
 		clocksource_counter.vdso_clock_mode = VDSO_CLOCKMODE_NONE;
 		vdso_default = VDSO_CLOCKMODE_NONE;
+	} else {
+		clocksource_counter.vdso_clock_mode = wa->vdso_clock_mode;
+		vdso_default = wa->vdso_clock_mode;
 	}
 }
 
-- 
2.27.0


  parent reply	other threads:[~2020-07-01 16:20 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-01 16:18 [PATCH 0/3] arm64: Allow the compat vdso to be disabled at runtime Marc Zyngier
2020-07-01 16:18 ` Marc Zyngier
2020-07-01 16:18 ` [PATCH 1/3] arm64: Introduce a way to disable the 32bit vdso Marc Zyngier
2020-07-01 16:18   ` Marc Zyngier
2020-07-02 10:18   ` Mark Rutland
2020-07-02 10:18     ` Mark Rutland
2020-07-01 16:18 ` Marc Zyngier [this message]
2020-07-01 16:18   ` [PATCH 2/3] arm64: arch_timer: Allow an workaround descriptor to provide vdso_clock_mode Marc Zyngier
2020-07-02 10:28   ` Mark Rutland
2020-07-02 10:28     ` Mark Rutland
2020-07-02 13:52     ` Marc Zyngier
2020-07-02 13:52       ` Marc Zyngier
2020-07-01 16:18 ` [PATCH 3/3] arm64: timers: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040 Marc Zyngier
2020-07-01 16:18   ` Marc Zyngier

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