#ifndef __LINUX_CPU_RMAP_H #define __LINUX_CPU_RMAP_H /* * cpu_rmap.c: CPU affinity reverse-map support * Copyright 2011 Solarflare Communications Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation, incorporated herein by reference. */ #include <linux/cpumask.h> #include <linux/gfp.h> #include <linux/slab.h> #include <linux/kref.h> /** * struct cpu_rmap - CPU affinity reverse-map * @refcount: kref for object * @size: Number of objects to be reverse-mapped * @used: Number of objects added * @obj: Pointer to array of object pointers * @near: For each CPU, the index and distance to the nearest object, * based on affinity masks */ struct cpu_rmap { struct kref refcount; u16 size, used; void **obj; struct { u16 index; u16 dist; } near[0]; }; #define CPU_RMAP_DIST_INF 0xffff extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags); extern int cpu_rmap_put(struct cpu_rmap *rmap); extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj); extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index, const struct cpumask *affinity); static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu) { return rmap->near[cpu].index; } static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu) { return rmap->obj[rmap->near[cpu].index]; } /** * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs * @size: Number of objects to be mapped * * Must be called in process context. */ static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size) { return alloc_cpu_rmap(size, GFP_KERNEL); } extern void free_irq_cpu_rmap(struct cpu_rmap *rmap); extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq); #endif /* __LINUX_CPU_RMAP_H */