Commit | Line | Data |
---|---|---|
48a1b10a | 1 | /* |
b9098957 | 2 | * NUMA irq-desc migration code |
48a1b10a | 3 | * |
b9098957 YL |
4 | * Migrate IRQ data structures (irq_desc, chip_data, etc.) over to |
5 | * the new "home node" of the IRQ. | |
48a1b10a YL |
6 | */ |
7 | ||
8 | #include <linux/irq.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/random.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/kernel_stat.h> | |
13 | ||
14 | #include "internals.h" | |
15 | ||
16 | static void init_copy_kstat_irqs(struct irq_desc *old_desc, | |
17 | struct irq_desc *desc, | |
18 | int cpu, int nr) | |
19 | { | |
20 | unsigned long bytes; | |
21 | ||
22 | init_kstat_irqs(desc, cpu, nr); | |
23 | ||
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); | |
27 | ||
28 | memcpy(desc->kstat_irqs, old_desc->kstat_irqs, bytes); | |
29 | } | |
30 | } | |
31 | ||
32 | static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc) | |
33 | { | |
34 | if (old_desc->kstat_irqs == desc->kstat_irqs) | |
35 | return; | |
36 | ||
37 | kfree(old_desc->kstat_irqs); | |
38 | old_desc->kstat_irqs = NULL; | |
39 | } | |
40 | ||
41 | static void init_copy_one_irq_desc(int irq, struct irq_desc *old_desc, | |
42 | struct irq_desc *desc, int cpu) | |
43 | { | |
44 | memcpy(desc, old_desc, sizeof(struct irq_desc)); | |
793f7b12 | 45 | spin_lock_init(&desc->lock); |
48a1b10a YL |
46 | desc->cpu = cpu; |
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); | |
50 | } | |
51 | ||
52 | static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc) | |
53 | { | |
54 | free_kstat_irqs(old_desc, desc); | |
55 | arch_free_chip_data(old_desc, desc); | |
56 | } | |
57 | ||
58 | static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc, | |
59 | int cpu) | |
60 | { | |
61 | struct irq_desc *desc; | |
62 | unsigned int irq; | |
63 | unsigned long flags; | |
64 | int node; | |
65 | ||
66 | irq = old_desc->irq; | |
67 | ||
68 | spin_lock_irqsave(&sparse_irq_lock, flags); | |
69 | ||
70 | /* We have to check it to avoid races with another CPU */ | |
71 | desc = irq_desc_ptrs[irq]; | |
72 | ||
73 | if (desc && old_desc != desc) | |
74 | goto out_unlock; | |
75 | ||
76 | node = cpu_to_node(cpu); | |
77 | desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node); | |
48a1b10a | 78 | if (!desc) { |
8b07cd44 | 79 | printk(KERN_ERR "irq %d: can not get new irq_desc for migration.\n", irq); |
48a1b10a YL |
80 | /* still use old one */ |
81 | desc = old_desc; | |
82 | goto out_unlock; | |
83 | } | |
84 | init_copy_one_irq_desc(irq, old_desc, desc, cpu); | |
85 | ||
86 | irq_desc_ptrs[irq] = desc; | |
87 | ||
88 | /* free the old one */ | |
89 | free_one_irq_desc(old_desc, desc); | |
90 | kfree(old_desc); | |
91 | ||
92 | out_unlock: | |
93 | spin_unlock_irqrestore(&sparse_irq_lock, flags); | |
94 | ||
95 | return desc; | |
96 | } | |
97 | ||
98 | struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu) | |
99 | { | |
100 | int old_cpu; | |
101 | int node, old_node; | |
102 | ||
103 | /* those all static, do move them */ | |
104 | if (desc->irq < NR_IRQS_LEGACY) | |
105 | return desc; | |
106 | ||
107 | old_cpu = desc->cpu; | |
48a1b10a YL |
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); | |
113 | else | |
114 | desc->cpu = cpu; | |
115 | } | |
116 | ||
117 | return desc; | |
118 | } | |
119 |