1 #ifndef __LINUX_CPU_RMAP_H
2 #define __LINUX_CPU_RMAP_H
5 * cpu_rmap.c: CPU affinity reverse-map support
6 * Copyright 2011 Solarflare Communications Inc.
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.
13 #include <linux/cpumask.h>
14 #include <linux/gfp.h>
15 #include <linux/slab.h>
16 #include <linux/kref.h>
19 * struct cpu_rmap - CPU affinity reverse-map
20 * @refcount: kref for object
21 * @size: Number of objects to be reverse-mapped
22 * @used: Number of objects added
23 * @obj: Pointer to array of object pointers
24 * @near: For each CPU, the index and distance to the nearest object,
25 * based on affinity masks
36 #define CPU_RMAP_DIST_INF 0xffff
38 extern struct cpu_rmap
*alloc_cpu_rmap(unsigned int size
, gfp_t flags
);
39 extern int cpu_rmap_put(struct cpu_rmap
*rmap
);
41 extern int cpu_rmap_add(struct cpu_rmap
*rmap
, void *obj
);
42 extern int cpu_rmap_update(struct cpu_rmap
*rmap
, u16 index
,
43 const struct cpumask
*affinity
);
45 static inline u16
cpu_rmap_lookup_index(struct cpu_rmap
*rmap
, unsigned int cpu
)
47 return rmap
->near
[cpu
].index
;
50 static inline void *cpu_rmap_lookup_obj(struct cpu_rmap
*rmap
, unsigned int cpu
)
52 return rmap
->obj
[rmap
->near
[cpu
].index
];
56 * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs
57 * @size: Number of objects to be mapped
59 * Must be called in process context.
61 static inline struct cpu_rmap
*alloc_irq_cpu_rmap(unsigned int size
)
63 return alloc_cpu_rmap(size
, GFP_KERNEL
);
65 extern void free_irq_cpu_rmap(struct cpu_rmap
*rmap
);
67 extern int irq_cpu_rmap_add(struct cpu_rmap
*rmap
, int irq
);
69 #endif /* __LINUX_CPU_RMAP_H */
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