linux-kernel - [PATCH v5 05/11] genirq: Introduce irq_can_move_in_process

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Message-ID: <20250209041655.331470-6-apatel@ventanamicro.com>
Date: Sun,  9 Feb 2025 09:46:49 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org
Cc: hpa@...or.com,
	Marc Zyngier <maz@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Atish Patra <atishp@...shpatra.org>,
	Andrew Jones <ajones@...tanamicro.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Anup Patel <anup@...infault.org>,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH v5 05/11] genirq: Introduce irq_can_move_in_process_context()

The interrupt controller drivers which use GENERIC_PENDING_IRQ
can move interrupts in process context for downstrean devices
which support atomic MSI configuration.

Introduce irq_can_move_in_process_context() which allows interrupt
controller drivers to test whether a particular interrupt can be
moved process context.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 include/linux/irq.h    |  2 ++
 kernel/irq/migration.c | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 56f6583093d2..dd5df1e2d032 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -615,6 +615,7 @@ extern int irq_affinity_online_cpu(unsigned int cpu);
 #endif
 
 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
+bool irq_can_move_in_process_context(struct irq_data *data);
 void __irq_move_irq(struct irq_data *data);
 static inline void irq_move_irq(struct irq_data *data)
 {
@@ -623,6 +624,7 @@ static inline void irq_move_irq(struct irq_data *data)
 }
 void irq_move_masked_irq(struct irq_data *data);
 #else
+static inline bool irq_can_move_in_process_context(struct irq_data *data) { return true; }
 static inline void irq_move_irq(struct irq_data *data) { }
 static inline void irq_move_masked_irq(struct irq_data *data) { }
 #endif
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index e110300ad650..5acea2ac57be 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -127,3 +127,14 @@ void __irq_move_irq(struct irq_data *idata)
 	if (!masked)
 		idata->chip->irq_unmask(idata);
 }
+
+bool irq_can_move_in_process_context(struct irq_data *data)
+{
+	/*
+	 * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled,
+	 * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is
+	 * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here.
+	 */
+	data = irq_desc_get_irq_data(irq_data_to_desc(data));
+	return irq_can_move_pcntxt(data);
+}
-- 
2.43.0