diff options
Diffstat (limited to 'kernel/include/linux/cpu_rmap.h')
| -rw-r--r-- | kernel/include/linux/cpu_rmap.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/kernel/include/linux/cpu_rmap.h b/kernel/include/linux/cpu_rmap.h new file mode 100644 index 000000000..bdd18caa6 --- /dev/null +++ b/kernel/include/linux/cpu_rmap.h @@ -0,0 +1,69 @@ +#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 */ |