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 void 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 spin_lock_init(&desc
->lock
);
47 lockdep_set_class(&desc
->lock
, &irq_desc_lock_class
);
48 init_copy_kstat_irqs(old_desc
, desc
, cpu
, nr_cpu_ids
);
49 arch_init_copy_chip_data(old_desc
, desc
, cpu
);
52 static void free_one_irq_desc(struct irq_desc
*old_desc
, struct irq_desc
*desc
)
54 free_kstat_irqs(old_desc
, desc
);
55 arch_free_chip_data(old_desc
, desc
);
58 static struct irq_desc
*__real_move_irq_desc(struct irq_desc
*old_desc
,
61 struct irq_desc
*desc
;
68 spin_lock_irqsave(&sparse_irq_lock
, flags
);
70 /* We have to check it to avoid races with another CPU */
71 desc
= irq_desc_ptrs
[irq
];
73 if (desc
&& old_desc
!= desc
)
76 node
= cpu_to_node(cpu
);
77 desc
= kzalloc_node(sizeof(*desc
), GFP_ATOMIC
, node
);
79 printk(KERN_ERR
"irq %d: can not get new irq_desc for migration.\n", irq
);
80 /* still use old one */
84 init_copy_one_irq_desc(irq
, old_desc
, desc
, cpu
);
86 irq_desc_ptrs
[irq
] = desc
;
88 /* free the old one */
89 free_one_irq_desc(old_desc
, desc
);
93 spin_unlock_irqrestore(&sparse_irq_lock
, flags
);
98 struct irq_desc
*move_irq_desc(struct irq_desc
*desc
, int cpu
)
103 /* those all static, do move them */
104 if (desc
->irq
< NR_IRQS_LEGACY
)
108 if (old_cpu
!= cpu
) {
109 node
= cpu_to_node(cpu
);
110 old_node
= cpu_to_node(old_cpu
);
111 if (old_node
!= node
)
112 desc
= __real_move_irq_desc(desc
, cpu
);