From fef05a078b6fa1e9047e0486f1f6daf70664fd12 Mon Sep 17 00:00:00 2001 From: Jacob Pan Date: Tue, 23 Apr 2024 10:41:11 -0700 Subject: [PATCH] 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 Signed-off-by: Thomas Gleixner 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 e6ab0cf15ed5..50f9781fa3ed 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 185738c72766..9eec52925fa3 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 578e4f6a5080..385e3a5fc304 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);