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,
22 init_kstat_irqs(desc, cpu, nr);
24 if (desc->kstat_irqs != old_desc->kstat_irqs) {
25 /* Compute how many bytes we need per irq and allocate them */
26 bytes = nr * sizeof(unsigned int);
28 memcpy(desc->kstat_irqs, old_desc->kstat_irqs, bytes);
32 static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc)
34 if (old_desc->kstat_irqs == desc->kstat_irqs)
37 kfree(old_desc->kstat_irqs);
38 old_desc->kstat_irqs = NULL;
41 static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc,
42 struct irq_desc *desc, int cpu)
44 memcpy(desc, old_desc, sizeof(struct irq_desc));
45 if (!init_alloc_desc_masks(desc, cpu, false)) {
46 printk(KERN_ERR "irq %d: can not get new irq_desc cpumask "
47 "for migration.\n", irq);
50 spin_lock_init(&desc->lock);
52 lockdep_set_class(&desc->lock, &irq_desc_lock_class);
53 init_copy_kstat_irqs(old_desc, desc, cpu, nr_cpu_ids);
54 init_copy_desc_masks(old_desc, desc);
55 arch_init_copy_chip_data(old_desc, desc, cpu);
59 static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc)
61 free_kstat_irqs(old_desc, desc);
62 arch_free_chip_data(old_desc, desc);
65 static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
68 struct irq_desc *desc;
75 spin_lock_irqsave(&sparse_irq_lock, flags);
77 /* We have to check it to avoid races with another CPU */
78 desc = irq_desc_ptrs[irq];
80 if (desc && old_desc != desc)
83 node = cpu_to_node(cpu);
84 desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
86 printk(KERN_ERR "irq %d: can not get new irq_desc "
87 "for migration.\n", irq);
88 /* still use old one */
92 if (!init_copy_one_irq_desc(irq, old_desc, desc, cpu)) {
93 /* still use old one */
99 irq_desc_ptrs[irq] = desc;
100 spin_unlock_irqrestore(&sparse_irq_lock, flags);
102 /* free the old one */
103 free_one_irq_desc(old_desc, desc);
104 spin_unlock(&old_desc->lock);
106 spin_lock(&desc->lock);
111 spin_unlock_irqrestore(&sparse_irq_lock, flags);
116 struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu)
121 /* those all static, do move them */
122 if (desc->irq < NR_IRQS_LEGACY)
126 if (old_cpu != cpu) {
127 node = cpu_to_node(cpu);
128 old_node = cpu_to_node(old_cpu);
129 if (old_node != node)
130 desc = __real_move_irq_desc(desc, cpu);