diff options
Diffstat (limited to 'kernel/irq/irqdesc.c')
| -rw-r--r-- | kernel/irq/irqdesc.c | 51 |
1 files changed, 39 insertions, 12 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index b8df4fcdbb5f..a623b44f2d4b 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -68,9 +68,13 @@ static int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) return 0; } -static void desc_smp_init(struct irq_desc *desc, int node) +static void desc_smp_init(struct irq_desc *desc, int node, + const struct cpumask *affinity) { - cpumask_copy(desc->irq_common_data.affinity, irq_default_affinity); + if (!affinity) + affinity = irq_default_affinity; + cpumask_copy(desc->irq_common_data.affinity, affinity); + #ifdef CONFIG_GENERIC_PENDING_IRQ cpumask_clear(desc->pending_mask); #endif @@ -82,11 +86,12 @@ static void desc_smp_init(struct irq_desc *desc, int node) #else static inline int alloc_masks(struct irq_desc *desc, gfp_t gfp, int node) { return 0; } -static inline void desc_smp_init(struct irq_desc *desc, int node) { } +static inline void +desc_smp_init(struct irq_desc *desc, int node, const struct cpumask *affinity) { } #endif static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, - struct module *owner) + const struct cpumask *affinity, struct module *owner) { int cpu; @@ -107,7 +112,7 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, desc->owner = owner; for_each_possible_cpu(cpu) *per_cpu_ptr(desc->kstat_irqs, cpu) = 0; - desc_smp_init(desc, node); + desc_smp_init(desc, node, affinity); } int nr_irqs = NR_IRQS; @@ -158,7 +163,9 @@ void irq_unlock_sparse(void) mutex_unlock(&sparse_irq_lock); } -static struct irq_desc *alloc_desc(int irq, int node, struct module *owner) +static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags, + const struct cpumask *affinity, + struct module *owner) { struct irq_desc *desc; gfp_t gfp = GFP_KERNEL; @@ -178,7 +185,8 @@ static struct irq_desc *alloc_desc(int irq, int node, struct module *owner) lockdep_set_class(&desc->lock, &irq_desc_lock_class); init_rcu_head(&desc->rcu); - desc_set_defaults(irq, desc, node, owner); + desc_set_defaults(irq, desc, node, affinity, owner); + irqd_set(&desc->irq_data, flags); return desc; @@ -225,11 +233,30 @@ static void free_desc(unsigned int irq) static int alloc_descs(unsigned int start, unsigned int cnt, int node, const struct cpumask *affinity, struct module *owner) { + const struct cpumask *mask = NULL; struct irq_desc *desc; - int i; + unsigned int flags; + int i, cpu = -1; + + if (affinity && cpumask_empty(affinity)) + return -EINVAL; + + flags = affinity ? IRQD_AFFINITY_MANAGED : 0; for (i = 0; i < cnt; i++) { - desc = alloc_desc(start + i, node, owner); + if (affinity) { + cpu = cpumask_next(cpu, affinity); + if (cpu >= nr_cpu_ids) + cpu = cpumask_first(affinity); + node = cpu_to_node(cpu); + + /* + * For single allocations we use the caller provided + * mask otherwise we use the mask of the target cpu + */ + mask = cnt == 1 ? affinity : cpumask_of(cpu); + } + desc = alloc_desc(start + i, node, flags, mask, owner); if (!desc) goto err; mutex_lock(&sparse_irq_lock); @@ -277,7 +304,7 @@ int __init early_irq_init(void) nr_irqs = initcnt; for (i = 0; i < initcnt; i++) { - desc = alloc_desc(i, node, NULL); + desc = alloc_desc(i, node, 0, NULL, NULL); set_bit(i, allocated_irqs); irq_insert_desc(i, desc); } @@ -311,7 +338,7 @@ int __init early_irq_init(void) alloc_masks(&desc[i], GFP_KERNEL, node); raw_spin_lock_init(&desc[i].lock); lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); - desc_set_defaults(i, &desc[i], node, NULL); + desc_set_defaults(i, &desc[i], node, NULL, NULL); } return arch_early_irq_init(); } @@ -328,7 +355,7 @@ static void free_desc(unsigned int irq) unsigned long flags; raw_spin_lock_irqsave(&desc->lock, flags); - desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL); + desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL); raw_spin_unlock_irqrestore(&desc->lock, flags); } |