diff options
| -rw-r--r-- | arch/x86/kernel/apic/vector.c | 56 |
1 files changed, 33 insertions, 23 deletions
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index 46a9ae921819..5e58da8efe77 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -258,17 +258,6 @@ static int assign_irq_vector_any_locked(struct irq_data *irqd) return assign_vector_locked(irqd, cpu_online_mask); } -static int assign_irq_vector_any(struct irq_data *irqd) -{ - unsigned long flags; - int ret; - - raw_spin_lock_irqsave(&vector_lock, flags); - ret = assign_irq_vector_any_locked(irqd); - raw_spin_unlock_irqrestore(&vector_lock, flags); - return ret; -} - static int assign_irq_vector_policy(struct irq_data *irqd, struct irq_alloc_info *info) { @@ -276,10 +265,10 @@ assign_irq_vector_policy(struct irq_data *irqd, struct irq_alloc_info *info) return reserve_managed_vector(irqd); if (info->mask) return assign_irq_vector(irqd, info->mask); - if (info->type != X86_IRQ_ALLOC_TYPE_MSI && - info->type != X86_IRQ_ALLOC_TYPE_MSIX) - return assign_irq_vector_any(irqd); - /* For MSI(X) make only a global reservation with no guarantee */ + /* + * Make only a global reservation with no guarantee. A real vector + * is associated at activation time. + */ return reserve_irq_vector(irqd); } @@ -456,13 +445,39 @@ static void x86_vector_free_irqs(struct irq_domain *domain, } } +static bool vector_configure_legacy(unsigned int virq, struct irq_data *irqd, + struct apic_chip_data *apicd) +{ + unsigned long flags; + bool realloc = false; + + apicd->vector = ISA_IRQ_VECTOR(virq); + apicd->cpu = 0; + + raw_spin_lock_irqsave(&vector_lock, flags); + /* + * If the interrupt is activated, then it must stay at this vector + * position. That's usually the timer interrupt (0). + */ + if (irqd_is_activated(irqd)) { + trace_vector_setup(virq, true, 0); + apic_update_irq_cfg(irqd, apicd->vector, apicd->cpu); + } else { + /* Release the vector */ + apicd->can_reserve = true; + clear_irq_vector(irqd); + realloc = true; + } + raw_spin_unlock_irqrestore(&vector_lock, flags); + return realloc; +} + static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *arg) { struct irq_alloc_info *info = arg; struct apic_chip_data *apicd; struct irq_data *irqd; - unsigned long flags; int i, err, node; if (disable_apic) @@ -496,13 +511,8 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq, * config. */ if (info->flags & X86_IRQ_ALLOC_LEGACY) { - apicd->vector = ISA_IRQ_VECTOR(virq + i); - apicd->cpu = 0; - trace_vector_setup(virq + i, true, 0); - raw_spin_lock_irqsave(&vector_lock, flags); - apic_update_irq_cfg(irqd, apicd->vector, apicd->cpu); - raw_spin_unlock_irqrestore(&vector_lock, flags); - continue; + if (!vector_configure_legacy(virq + i, irqd, apicd)) + continue; } err = assign_irq_vector_policy(irqd, info); |