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 | { | |
48a1b10a YL |
20 | init_kstat_irqs(desc, cpu, nr); |
21 | ||
005bf0e6 YL |
22 | if (desc->kstat_irqs != old_desc->kstat_irqs) |
23 | memcpy(desc->kstat_irqs, old_desc->kstat_irqs, | |
24 | nr * sizeof(*desc->kstat_irqs)); | |
48a1b10a YL |
25 | } |
26 | ||
27 | static void free_kstat_irqs(struct irq_desc *old_desc, struct irq_desc *desc) | |
28 | { | |
29 | if (old_desc->kstat_irqs == desc->kstat_irqs) | |
30 | return; | |
31 | ||
32 | kfree(old_desc->kstat_irqs); | |
33 | old_desc->kstat_irqs = NULL; | |
34 | } | |
35 | ||
802bf931 | 36 | static bool init_copy_one_irq_desc(int irq, struct irq_desc *old_desc, |
48a1b10a YL |
37 | struct irq_desc *desc, int cpu) |
38 | { | |
39 | memcpy(desc, old_desc, sizeof(struct irq_desc)); | |
802bf931 MT |
40 | if (!init_alloc_desc_masks(desc, cpu, false)) { |
41 | printk(KERN_ERR "irq %d: can not get new irq_desc cpumask " | |
42 | "for migration.\n", irq); | |
43 | return false; | |
44 | } | |
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); | |
7f7ace0c | 49 | init_copy_desc_masks(old_desc, desc); |
48a1b10a | 50 | arch_init_copy_chip_data(old_desc, desc, cpu); |
802bf931 | 51 | return true; |
48a1b10a YL |
52 | } |
53 | ||
54 | static void free_one_irq_desc(struct irq_desc *old_desc, struct irq_desc *desc) | |
55 | { | |
56 | free_kstat_irqs(old_desc, desc); | |
9756b15e | 57 | free_desc_masks(old_desc, desc); |
48a1b10a YL |
58 | arch_free_chip_data(old_desc, desc); |
59 | } | |
60 | ||
61 | static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc, | |
62 | int cpu) | |
63 | { | |
64 | struct irq_desc *desc; | |
65 | unsigned int irq; | |
66 | unsigned long flags; | |
67 | int node; | |
68 | ||
69 | irq = old_desc->irq; | |
70 | ||
71 | spin_lock_irqsave(&sparse_irq_lock, flags); | |
72 | ||
73 | /* We have to check it to avoid races with another CPU */ | |
74 | desc = irq_desc_ptrs[irq]; | |
75 | ||
76 | if (desc && old_desc != desc) | |
10b888d6 | 77 | goto out_unlock; |
48a1b10a YL |
78 | |
79 | node = cpu_to_node(cpu); | |
80 | desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node); | |
48a1b10a | 81 | if (!desc) { |
7f7ace0c MT |
82 | printk(KERN_ERR "irq %d: can not get new irq_desc " |
83 | "for migration.\n", irq); | |
48a1b10a YL |
84 | /* still use old one */ |
85 | desc = old_desc; | |
86 | goto out_unlock; | |
87 | } | |
802bf931 | 88 | if (!init_copy_one_irq_desc(irq, old_desc, desc, cpu)) { |
48a1b10a | 89 | /* still use old one */ |
7f7ace0c | 90 | kfree(desc); |
48a1b10a YL |
91 | desc = old_desc; |
92 | goto out_unlock; | |
93 | } | |
48a1b10a YL |
94 | |
95 | irq_desc_ptrs[irq] = desc; | |
10b888d6 | 96 | spin_unlock_irqrestore(&sparse_irq_lock, flags); |
48a1b10a YL |
97 | |
98 | /* free the old one */ | |
99 | free_one_irq_desc(old_desc, desc); | |
10b888d6 | 100 | spin_unlock(&old_desc->lock); |
48a1b10a | 101 | kfree(old_desc); |
10b888d6 YL |
102 | spin_lock(&desc->lock); |
103 | ||
104 | return desc; | |
48a1b10a YL |
105 | |
106 | out_unlock: | |
107 | spin_unlock_irqrestore(&sparse_irq_lock, flags); | |
108 | ||
109 | return desc; | |
110 | } | |
111 | ||
112 | struct irq_desc *move_irq_desc(struct irq_desc *desc, int cpu) | |
113 | { | |
114 | int old_cpu; | |
115 | int node, old_node; | |
116 | ||
117 | /* those all static, do move them */ | |
118 | if (desc->irq < NR_IRQS_LEGACY) | |
119 | return desc; | |
120 | ||
121 | old_cpu = desc->cpu; | |
48a1b10a YL |
122 | if (old_cpu != cpu) { |
123 | node = cpu_to_node(cpu); | |
124 | old_node = cpu_to_node(old_cpu); | |
125 | if (old_node != node) | |
126 | desc = __real_move_irq_desc(desc, cpu); | |
127 | else | |
128 | desc->cpu = cpu; | |
129 | } | |
130 | ||
131 | return desc; | |
132 | } | |
133 |