linux-kernel - [PATCH RFC 08/13] x86/irq: Factor out calling ISR from common

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Message-Id: <20231112041643.2868316-9-jacob.jun.pan@linux.intel.com>
Date:   Sat, 11 Nov 2023 20:16:38 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>, X86 Kernel <x86@...nel.org>,
        iommu@...ts.linux.dev, Thomas Gleixner <tglx@...utronix.de>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>, kvm@...r.kernel.org,
        Dave Hansen <dave.hansen@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        "H. Peter Anvin" <hpa@...or.com>, "Borislav Petkov" <bp@...en8.de>,
        "Ingo Molnar" <mingo@...hat.com>
Cc:     Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, maz@...nel.org,
        peterz@...radead.org, seanjc@...gle.com,
        "Robin Murphy" <robin.murphy@....com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH RFC 08/13] x86/irq: Factor out calling ISR from common_interrupt

Prepare for calling external IRQ handlers directly from the posted MSI
demultiplexing loop. Extract the common code with common interrupt to
avoid code duplication.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 arch/x86/kernel/irq.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index fd4d664d81bb..0bffe8152385 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -242,18 +242,10 @@ static __always_inline void handle_irq(struct irq_desc *desc,
 		__handle_irq(desc, regs);
 }
 
-/*
- * common_interrupt() handles all normal device IRQ's (the special SMP
- * cross-CPU interrupts have their own entry points).
- */
-DEFINE_IDTENTRY_IRQ(common_interrupt)
+static __always_inline void call_irq_handler(int vector, struct pt_regs *regs)
 {
-	struct pt_regs *old_regs = set_irq_regs(regs);
 	struct irq_desc *desc;
 
-	/* entry code tells RCU that we're not quiescent.  Check it. */
-	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
-
 	desc = __this_cpu_read(vector_irq[vector]);
 	if (likely(!IS_ERR_OR_NULL(desc))) {
 		handle_irq(desc, regs);
@@ -268,7 +260,20 @@ DEFINE_IDTENTRY_IRQ(common_interrupt)
 			__this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
 		}
 	}
+}
+
+/*
+ * common_interrupt() handles all normal device IRQ's (the special SMP
+ * cross-CPU interrupts have their own entry points).
+ */
+DEFINE_IDTENTRY_IRQ(common_interrupt)
+{
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
+	/* entry code tells RCU that we're not quiescent.  Check it. */
+	RCU_LOCKDEP_WARN(!rcu_is_watching(), "IRQ failed to wake up RCU");
 
+	call_irq_handler(vector, regs);
 	set_irq_regs(old_regs);
 }
 
-- 
2.25.1