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From: Marc Zyngier <maz@kernel.org>
To: LAK <linux-arm-kernel@lists.infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Android Kernel Team <kernel-team@android.com>,
	Russell King <linux@arm.linux.org.uk>,
	Peter Zijlstra <peterz@infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	Valentin Schneider <Valentin.Schneider@arm.com>
Subject: [PATCH v2 4/6] arm: Mark the recheduling IPI as raw interrupt
Date: Tue, 24 Nov 2020 14:14:47 +0000	[thread overview]
Message-ID: <20201124141449.572446-5-maz@kernel.org> (raw)
In-Reply-To: <20201124141449.572446-1-maz@kernel.org>

Flag the rescheduling IPI as 'raw', making sure such interrupt
skips both tick management  and irqtime accounting.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm/Kconfig      | 1 +
 arch/arm/kernel/smp.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fe2f17eb2b50..a5e3e9963ba4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -50,6 +50,7 @@ config ARM
 	select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 	select GENERIC_IRQ_IPI if SMP
+	select ARCH_WANTS_IRQ_RAW if GENERIC_IRQ_IPI
 	select GENERIC_CPU_AUTOPROBE
 	select GENERIC_EARLY_IOREMAP
 	select GENERIC_IDLE_POLL_SETUP
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 48099c6e1e4a..0e09c8320caf 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -738,6 +738,10 @@ void __init set_smp_ipi_range(int ipi_base, int n)
 
 		ipi_desc[i] = irq_to_desc(ipi_base + i);
 		irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
+
+		/* The recheduling IPI is special... */
+		if (i == IPI_RESCHEDULE)
+			__irq_modify_status(ipi_base + i, 0, IRQ_RAW, ~0);
 	}
 
 	ipi_irq_base = ipi_base;
-- 
2.28.0


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WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: LAK <linux-arm-kernel@lists.infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Cc: Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Valentin Schneider <Valentin.Schneider@arm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Russell King <linux@arm.linux.org.uk>,
	Android Kernel Team <kernel-team@android.com>
Subject: [PATCH v2 4/6] arm: Mark the recheduling IPI as raw interrupt
Date: Tue, 24 Nov 2020 14:14:47 +0000	[thread overview]
Message-ID: <20201124141449.572446-5-maz@kernel.org> (raw)
In-Reply-To: <20201124141449.572446-1-maz@kernel.org>

Flag the rescheduling IPI as 'raw', making sure such interrupt
skips both tick management  and irqtime accounting.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm/Kconfig      | 1 +
 arch/arm/kernel/smp.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fe2f17eb2b50..a5e3e9963ba4 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -50,6 +50,7 @@ config ARM
 	select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 	select GENERIC_IRQ_IPI if SMP
+	select ARCH_WANTS_IRQ_RAW if GENERIC_IRQ_IPI
 	select GENERIC_CPU_AUTOPROBE
 	select GENERIC_EARLY_IOREMAP
 	select GENERIC_IDLE_POLL_SETUP
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 48099c6e1e4a..0e09c8320caf 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -738,6 +738,10 @@ void __init set_smp_ipi_range(int ipi_base, int n)
 
 		ipi_desc[i] = irq_to_desc(ipi_base + i);
 		irq_set_status_flags(ipi_base + i, IRQ_HIDDEN);
+
+		/* The recheduling IPI is special... */
+		if (i == IPI_RESCHEDULE)
+			__irq_modify_status(ipi_base + i, 0, IRQ_RAW, ~0);
 	}
 
 	ipi_irq_base = ipi_base;
-- 
2.28.0


  parent reply	other threads:[~2020-11-24 14:16 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-24 14:14 [PATCH v2 0/6] arm/arm64: Allow the rescheduling IPI to bypass irq_enter/exit Marc Zyngier
2020-11-24 14:14 ` Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 1/6] genirq: Add __irq_modify_status() helper to clear/set special flags Marc Zyngier
2020-11-24 14:14   ` Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 2/6] genirq: Allow an interrupt to be marked as 'raw' Marc Zyngier
2020-11-24 14:14   ` Marc Zyngier
2020-11-24 16:26   ` Peter Zijlstra
2020-11-24 16:26     ` Peter Zijlstra
2020-11-24 16:56     ` Marc Zyngier
2020-11-24 16:56       ` Marc Zyngier
2020-11-26 18:18   ` Valentin Schneider
2020-11-26 18:18     ` Valentin Schneider
2020-12-03 13:03     ` Peter Zijlstra
2020-12-03 13:03       ` Peter Zijlstra
2020-12-03 15:52       ` Valentin Schneider
2020-12-03 15:52         ` Valentin Schneider
2020-12-05 19:24         ` Valentin Schneider
2020-12-05 19:24           ` Valentin Schneider
2020-12-10 15:07   ` Will Deacon
2020-12-10 15:07     ` Will Deacon
2021-06-23 17:28   ` Todd Kjos
2021-06-23 17:28     ` Todd Kjos
2020-11-24 14:14 ` [PATCH v2 3/6] arm64: Mark the recheduling IPI as raw interrupt Marc Zyngier
2020-11-24 14:14   ` Marc Zyngier
2020-12-10 15:15   ` Will Deacon
2020-12-10 15:15     ` Will Deacon
2020-11-24 14:14 ` Marc Zyngier [this message]
2020-11-24 14:14   ` [PATCH v2 4/6] arm: " Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 5/6] genirq: Drop IRQ_HIDDEN from IRQF_MODIFY_MASK Marc Zyngier
2020-11-24 14:14   ` Marc Zyngier
2020-11-24 14:14 ` [PATCH v2 6/6] genirq: Rename IRQ_HIDDEN to IRQ_IPI Marc Zyngier
2020-11-24 14:14   ` Marc Zyngier
2020-11-26 18:18   ` Valentin Schneider
2020-11-26 18:18     ` Valentin Schneider
2021-03-01  0:39 ` [PATCH v2 0/6] arm/arm64: Allow the rescheduling IPI to bypass irq_enter/exit ito-yuichi
2021-03-01  0:39   ` ito-yuichi
2021-03-01  9:22   ` Marc Zyngier
2021-03-01  9:22     ` Marc Zyngier
2021-03-09  6:20     ` Yuichi Ito
2021-03-09  6:20       ` Yuichi Ito
2021-06-18 19:30 ` Abhijeet Dharmapurikar

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