linux-kernel - [tip: x86/irq] x86/irq: Factor out common code for checking pending interrupts

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Message-ID: <171448372145.10875.6906928487300074547.tip-bot2@tip-bot2>
Date: Tue, 30 Apr 2024 13:28:41 -0000
From: "tip-bot2 for Jacob Pan" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/irq] x86/irq: Factor out common code for checking pending
 interrupts

The following commit has been merged into the x86/irq branch of tip:

Commit-ID:     fef05a078b6fa1e9047e0486f1f6daf70664fd12
Gitweb:        https://git.kernel.org/tip/fef05a078b6fa1e9047e0486f1f6daf70664fd12
Author:        Jacob Pan <jacob.jun.pan@...ux.intel.com>
AuthorDate:    Tue, 23 Apr 2024 10:41:11 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 30 Apr 2024 00:54:43 +02:00

x86/irq: Factor out common code for checking pending interrupts

Use a common function for checking pending interrupt vector in APIC IRR
instead of duplicated open coding them.

Additional checks for posted MSI vectors can then be contained in this
function.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-10-jacob.jun.pan@linux.intel.com

---
 arch/x86/include/asm/apic.h   | 11 +++++++++++
 arch/x86/kernel/apic/vector.c |  5 ++---
 arch/x86/kernel/irq.c         |  5 ++---
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index e6ab0cf..50f9781 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -500,6 +500,17 @@ static inline bool lapic_vector_set_in_irr(unsigned int vector)
 	return !!(irr & (1U << (vector % 32)));
 }
 
+static inline bool is_vector_pending(unsigned int vector)
+{
+	unsigned int irr;
+
+	irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
+	if (irr  & (1 << (vector % 32)))
+		return true;
+
+	return false;
+}
+
 /*
  * Warm reset vector position:
  */
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 185738c..9eec529 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -965,7 +965,7 @@ static void __vector_cleanup(struct vector_cleanup *cl, bool check_irr)
 	lockdep_assert_held(&vector_lock);
 
 	hlist_for_each_entry_safe(apicd, tmp, &cl->head, clist) {
-		unsigned int irr, vector = apicd->prev_vector;
+		unsigned int vector = apicd->prev_vector;
 
 		/*
 		 * Paranoia: Check if the vector that needs to be cleaned
@@ -979,8 +979,7 @@ static void __vector_cleanup(struct vector_cleanup *cl, bool check_irr)
 		 * fixup_irqs() was just called to scan IRR for set bits and
 		 * forward them to new destination CPUs via IPIs.
 		 */
-		irr = check_irr ? apic_read(APIC_IRR + (vector / 32 * 0x10)) : 0;
-		if (irr & (1U << (vector % 32))) {
+		if (check_irr && is_vector_pending(vector)) {
 			pr_warn_once("Moved interrupt pending in old target APIC %u\n", apicd->irq);
 			rearm = true;
 			continue;
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 578e4f6..385e3a5 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -484,7 +484,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_posted_msi_notification)
 /* A cpu has been removed from cpu_online_mask.  Reset irq affinities. */
 void fixup_irqs(void)
 {
-	unsigned int irr, vector;
+	unsigned int vector;
 	struct irq_desc *desc;
 	struct irq_data *data;
 	struct irq_chip *chip;
@@ -511,8 +511,7 @@ void fixup_irqs(void)
 		if (IS_ERR_OR_NULL(__this_cpu_read(vector_irq[vector])))
 			continue;
 
-		irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
-		if (irr  & (1 << (vector % 32))) {
+		if (is_vector_pending(vector)) {
 			desc = __this_cpu_read(vector_irq[vector]);
 
 			raw_spin_lock(&desc->lock);