From: Pingfan Liu <kernelfans@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Pingfan Liu <kernelfans@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <maz@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Sami Tolvanen <samitolvanen@google.com>,
Julien Thierry <julien.thierry@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Yuichi Ito <ito-yuichi@fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: [PATCHv2 5/5] irqchip/GICv3: make reschedule-ipi light weight
Date: Fri, 24 Sep 2021 21:28:37 +0800 [thread overview]
Message-ID: <20210924132837.45994-6-kernelfans@gmail.com> (raw)
In-Reply-To: <20210924132837.45994-1-kernelfans@gmail.com>
To achieve the light weight as
DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) on x86, it had
better treat irqnr differently at the frontend. And let IPI_RESCHEDULE
call __irq_enter_raw() instead of irq_enter_rcu().
Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Julien Thierry <julien.thierry@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yuichi Ito <ito-yuichi@fujitsu.com>
Cc: linux-kernel@vger.kernel.org
To: linux-arm-kernel@lists.infradead.org
---
drivers/irqchip/irq-gic-v3.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 906538fa8771..593d4539a209 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -709,6 +709,9 @@ static void gic_handle_nmi(struct pt_regs *regs)
gic_deactivate_unhandled(irqnr);
}
+/* RESCHEDULE IPI hwirq nr is 0, and the only raw one */
+static unsigned long raw_interrupt_mask = 1;
+
static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
{
u32 irqnr;
@@ -729,12 +732,20 @@ static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs
else
isb();
- irq_enter_rcu();
+ if (raw_interrupt_mask & 1 << irqnr)
+ __irq_enter_raw();
+ else
+ irq_enter_rcu();
+
if (handle_domain_irq(gic_data.domain, irqnr, regs)) {
WARN_ONCE(true, "Unexpected interrupt received!\n");
gic_deactivate_unhandled(irqnr);
}
- irq_exit_rcu();
+
+ if (raw_interrupt_mask & 1 << irqnr)
+ __irq_exit_raw();
+ else
+ irq_exit_rcu();
}
static u32 gic_get_pribits(void)
--
2.31.1
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next prev parent reply other threads:[~2021-09-24 13:35 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 13:28 [PATCHv2 0/5] arm64/irqentry: remove duplicate housekeeping of Pingfan Liu
2021-09-24 13:28 ` [PATCHv2 1/5] arm64/entry-common: push the judgement of nmi ahead Pingfan Liu
2021-09-24 17:53 ` Mark Rutland
2021-09-25 15:39 ` Pingfan Liu
2021-09-30 13:32 ` Mark Rutland
2021-10-08 4:01 ` Pingfan Liu
2021-10-08 14:55 ` Pingfan Liu
2021-10-08 17:25 ` Mark Rutland
2021-10-09 3:49 ` Pingfan Liu
2021-10-08 15:45 ` Paul E. McKenney
2021-10-09 4:14 ` Pingfan Liu
2021-09-24 13:28 ` [PATCHv2 2/5] irqchip/GICv3: expose handle_nmi() directly Pingfan Liu
2021-09-24 13:28 ` [PATCHv2 3/5] kernel/irq: make irq_{enter, exit}() in handle_domain_irq() arch optional Pingfan Liu
2021-09-28 8:55 ` [PATCHv2 3/5] kernel/irq: make irq_{enter,exit}() " Mark Rutland
2021-09-29 3:15 ` Pingfan Liu
2021-09-24 13:28 ` [PATCHv2 4/5] irqchip/GICv3: let gic_handle_irq() utilize irqentry on arm64 Pingfan Liu
2021-09-28 9:10 ` Mark Rutland
2021-09-29 3:10 ` Pingfan Liu
2021-09-29 7:20 ` Marc Zyngier
2021-09-29 8:27 ` Pingfan Liu
2021-09-29 9:23 ` Mark Rutland
2021-09-29 11:40 ` Pingfan Liu
2021-09-29 14:29 ` Pingfan Liu
2021-09-29 17:41 ` Mark Rutland
2021-09-24 13:28 ` Pingfan Liu [this message]
2021-09-29 7:24 ` [PATCHv2 5/5] irqchip/GICv3: make reschedule-ipi light weight Marc Zyngier
2021-09-29 8:32 ` Pingfan Liu
2021-09-24 17:36 ` [PATCHv2 0/5] arm64/irqentry: remove duplicate housekeeping of Mark Rutland
2021-09-24 22:59 ` Paul E. McKenney
2021-09-27 9:23 ` Mark Rutland
2021-09-28 0:09 ` Paul E. McKenney
2021-09-28 8:32 ` Mark Rutland
2021-09-28 8:35 ` Mark Rutland
2021-09-28 9:52 ` Sven Schnelle
2021-09-28 10:26 ` Mark Rutland
2021-09-28 13:55 ` Paul E. McKenney
2021-09-25 15:12 ` Pingfan Liu
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