static struct irq_desc *alloc_desc(int irq, int node, struct module *owner)
{
struct irq_desc *desc;
gfp_t gfp = GFP_KERNEL;
desc = kzalloc_node(sizeof(*desc), gfp, node);
if (!desc)
return NULL;
/* allocate based on nr_cpu_ids */
desc->kstat_irqs = alloc_percpu(unsigned int);
if (!desc->kstat_irqs)
goto err_desc;
if (alloc_masks(desc, gfp, node))
goto err_kstat;
raw_spin_lock_init(&desc->lock);
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
desc_set_defaults(irq, desc, node, owner);
return desc;
err_kstat:
free_percpu(desc->kstat_irqs);
err_desc:
kfree(desc);
return NULL;
}
static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
const struct cpumask *affinity,
struct module *owner)
{
struct irq_desc *desc;
desc = kzalloc_node(sizeof(*desc), GFP_KERNEL, node);
if (!desc)
return NULL;
/* allocate based on nr_cpu_ids */
desc->kstat_irqs = alloc_percpu(unsigned int);
if (!desc->kstat_irqs)
goto err_desc;
if (alloc_masks(desc, node))
goto err_kstat;
raw_spin_lock_init(&desc->lock);
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
mutex_init(&desc->request_mutex);
init_rcu_head(&desc->rcu);
desc_set_defaults(irq, desc, node, affinity, owner);
irqd_set(&desc->irq_data, flags);
kobject_init(&desc->kobj, &irq_kobj_type);
return desc;
err_kstat:
free_percpu(desc->kstat_irqs);
err_desc:
kfree(desc);
return NULL;
}
int __init early_irq_init(void)
{
int count, i, node = first_online_node;
struct irq_desc *desc;
init_irq_default_affinity();
#ifdef CONFIG_DEBUG_PRINTK
printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
#else
;
#endif
desc = irq_desc;
count = ARRAY_SIZE(irq_desc);
for (i = 0; i < count; i++) {
desc[i].kstat_irqs = alloc_percpu(unsigned int);
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);
}
return arch_early_irq_init();
}
/**
* dynamic_irq_cleanup - cleanup a dynamically allocated irq
* @irq: irq number to initialize
*/
void dynamic_irq_cleanup(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
raw_spin_lock_irqsave(&desc->lock, flags);
desc_set_defaults(irq, desc, desc_node(desc), NULL);
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
static void free_desc(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
raw_spin_lock_irqsave(&desc->lock, flags);
desc_set_defaults(irq, desc, irq_desc_get_node(desc), NULL, NULL);
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
int __init early_irq_init(void)
{
int count, i, node = first_online_node;
struct irq_desc *desc;
init_irq_default_affinity();
printk(KERN_INFO "NR_IRQS: %d\n", NR_IRQS);
desc = irq_desc;
count = ARRAY_SIZE(irq_desc);
for (i = 0; i < count; i++) {
desc[i].kstat_irqs = alloc_percpu(unsigned int);
alloc_masks(&desc[i], node);
raw_spin_lock_init(&desc[i].lock);
lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
mutex_init(&desc[i].request_mutex);
desc_set_defaults(i, &desc[i], node, NULL, NULL);
}
return arch_early_irq_init();
}
// ARM10C 20141004
// i: 0, node: 0, null
// ARM10C 20141115
// 16, node: 0, owner: NULL
// ARM10C 20141115
// 64, node: 0, owner: NULL
static struct irq_desc *alloc_desc(int irq, int node, struct module *owner)
{
struct irq_desc *desc;
// GFP_KERNEL: 0xD0
gfp_t gfp = GFP_KERNEL;
// gfp: GFP_KERNEL: 0xD0
// sizeof(struct irq_desc): 156 bytes, gfp: GFP_KERNEL: 0xD0, node: 0
// kzalloc_node(156, GFP_KERNEL: 0xD0, 0): kmem_cache#28-o0
desc = kzalloc_node(sizeof(*desc), gfp, node);
// desc: kmem_cache#28-o0
// desc: kmem_cache#28-o0
if (!desc)
return NULL;
/* allocate based on nr_cpu_ids */
// desc->kstat_irqs: (kmem_cache#28-o0)->kstat_irqs
// alloc_percpu(unsigned int): pcp 4 byte 공간 할당
desc->kstat_irqs = alloc_percpu(unsigned int);
// desc->kstat_irqs: (kmem_cache#28-o0)->kstat_irqs: pcp 4 byte 공간
// desc->kstat_irqs: (kmem_cache#28-o0)->kstat_irqs: pcp 4 byte 공간
if (!desc->kstat_irqs)
goto err_desc;
// desc: kmem_cache#28-o0, gfp: GFP_KERNEL: 0xD0, node: 0
// alloc_masks(kmem_cache#28-o0, GFP_KERNEL: 0xD0, 0): 0
if (alloc_masks(desc, gfp, node))
goto err_kstat;
// alloc_masks에서 한일:
// (kmem_cache#28-o0)->irq_data.affinity.bits[0]: 0
// desc->lock: (kmem_cache#28-o0)->lock
raw_spin_lock_init(&desc->lock);
// desc->lock: (kmem_cache#28-o0)->lock 을 이용한 spinlock 초기화 수행
// desc->lock: (kmem_cache#28-o0)->lock
lockdep_set_class(&desc->lock, &irq_desc_lock_class); // null function
// irq: 0, desc: kmem_cache#28-o0, node: 0, owner: null
desc_set_defaults(irq, desc, node, owner);
// desc_set_defaults에서 한일:
// (kmem_cache#28-o0)->irq_data.irq: 0
// (kmem_cache#28-o0)->irq_data.chip: &no_irq_chip
// (kmem_cache#28-o0)->irq_data.chip_data: NULL
// (kmem_cache#28-o0)->irq_data.handler_data: NULL
// (kmem_cache#28-o0)->irq_data.msi_desc: NULL
// (kmem_cache#28-o0)->status_use_accessors: 0xc00
// (&(kmem_cache#28-o0)->irq_data)->state_use_accessors: 0x10000
// (kmem_cache#28-o0)->handle_irq: handle_bad_irq
// (kmem_cache#28-o0)->depth: 1
// (kmem_cache#28-o0)->irq_count: 0
// (kmem_cache#28-o0)->irqs_unhandled: 0
// (kmem_cache#28-o0)->name: NULL
// (kmem_cache#28-o0)->owner: null
// [pcp0...3] (kmem_cache#28-o0)->kstat_irqs: 0
// (kmem_cache#28-o0)->irq_data.node: 0
// (kmem_cache#28-o0)->irq_data.affinity.bits[0]: 0xF
return desc;
err_kstat:
free_percpu(desc->kstat_irqs);
err_desc:
kfree(desc);
return NULL;
}