2 * NUMA irq-desc migration code
4 * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to
5 * the new "home node" of the IRQ.
9 #include <linux/module.h>
10 #include <linux/random.h>
11 #include <linux/interrupt.h>
12 #include <linux/kernel_stat.h>
14 #include "internals.h"
16 static void init_copy_kstat_irqs(struct irq_desc *old_desc,
17 struct irq_desc *desc,
20 init_kstat_irqs(desc, cpu, nr);
22 if (desc->kstat_irqs != old_desc->kstat_irqs)
23 memcpy(desc->kstat_irqs, old_desc->kstat_irqs,
24 nr * sizeof(*desc->kstat_irqs));
27 static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
29 if (old_desc->kstat_irqs == desc->kstat_irqs)
32 kfree(old_desc->kstat_irqs);
33 old_desc->kstat_irqs = NULL;
36 static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
37 struct irq_desc *desc, int cpu)
39 memcpy(desc, old_desc, sizeof(struct irq_desc));
40 spin_lock_init(&desc->lock);
42 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
43 init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
44 arch_init_copy_chip_data(old_desc, desc, cpu);
47 static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
49 free_kstat_irqs(old_desc, desc);
50 arch_free_chip_data(old_desc, desc);
53 static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
56 struct irq_desc *desc;
63 spin_lock_irqsave(&sparse_irq_lock, flags);
65 /* We have to check it to avoid races with another CPU */
66 desc = irq_desc_ptrs[irq];
68 if (desc && old_desc != desc)
71 node = cpu_to_node(cpu);
72 desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
74 printk(KERN_ERR "irq %d: can not get new irq_desc for migration.\n", irq);
75 /* still use old one */
79 init_copy_one_irq_desc(irq, old_desc, desc, cpu);
81 irq_desc_ptrs[irq] = desc;
83 /* free the old one */
84 free_one_irq_desc(old_desc, desc);
88 spin_unlock_irqrestore(&sparse_irq_lock, flags);
93 struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
98 /* those all static, do move them */
99 if (desc->irq < NR_IRQS_LEGACY)
103 if (old_cpu != cpu) {
104 node = cpu_to_node(cpu);
105 old_node = cpu_to_node(old_cpu);
106 if (old_node != node)
107 desc = __real_move_irq_desc(desc, cpu);