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

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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@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-10-jacob.jun.pan@linux.intel.com
This commit is contained in:
Jacob Pan 2024-04-23 10:41:11 -07:00 committed by Thomas Gleixner
parent 1b03d82ba1
commit fef05a078b
3 changed files with 15 additions and 6 deletions
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11
arch/x86/include/asm/apic.h
View file

@ -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:
*/

5
arch/x86/kernel/apic/vector.c
View file

@ -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;

5
arch/x86/kernel/irq.c
View file

@ -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);