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1#ifndef __LINUX_CPU_RMAP_H
2#define __LINUX_CPU_RMAP_H
3
4/*
5 * cpu_rmap.c: CPU affinity reverse-map support
6 * Copyright 2011 Solarflare Communications Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation, incorporated herein by reference.
11 */
12
13#include <linux/cpumask.h>
14#include <linux/gfp.h>
15#include <linux/slab.h>
16
17/**
18 * struct cpu_rmap - CPU affinity reverse-map
19 * @size: Number of objects to be reverse-mapped
20 * @used: Number of objects added
21 * @obj: Pointer to array of object pointers
22 * @near: For each CPU, the index and distance to the nearest object,
23 * based on affinity masks
24 */
25struct cpu_rmap {
26 u16 size, used;
27 void **obj;
28 struct {
29 u16 index;
30 u16 dist;
31 } near[0];
32};
33#define CPU_RMAP_DIST_INF 0xffff
34
35extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags);
36
37/**
38 * free_cpu_rmap - free CPU affinity reverse-map
39 * @rmap: Reverse-map allocated with alloc_cpu_rmap(), or %NULL
40 */
41static inline void free_cpu_rmap(struct cpu_rmap *rmap)
42{
43 kfree(rmap);
44}
45
46extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj);
47extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index,
48 const struct cpumask *affinity);
49
50static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu)
51{
52 return rmap->near[cpu].index;
53}
54
55static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu)
56{
57 return rmap->obj[rmap->near[cpu].index];
58}
59
60#ifdef CONFIG_GENERIC_HARDIRQS
61
62/**
63 * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs
64 * @size: Number of objects to be mapped
65 *
66 * Must be called in process context.
67 */
68static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size)
69{
70 return alloc_cpu_rmap(size, GFP_KERNEL);
71}
72extern void free_irq_cpu_rmap(struct cpu_rmap *rmap);
73
74extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq);
75
76#endif
77#endif /* __LINUX_CPU_RMAP_H */