projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 122733a1 AV |
1 | #ifndef __LINUX_CPU_RMAP_H |
| 2 | #define __LINUX_CPU_RMAP_H | |
| 3 | ||
| c39649c3 BH |
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 | */ | |
| 25 | struct 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 | ||
| 35 | extern 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 | */ | |
| 41 | static inline void free_cpu_rmap(struct cpu_rmap *rmap) | |
| 42 | { | |
| 43 | kfree(rmap); | |
| 44 | } | |
| 45 | ||
| 46 | extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj); | |
| 47 | extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index, | |
| 48 | const struct cpumask *affinity); | |
| 49 | ||
| 50 | static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu) | |
| 51 | { | |
| 52 | return rmap->near[cpu].index; | |
| 53 | } | |
| 54 | ||
| 55 | static 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 | */ | |
| 68 | static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size) | |
| 69 | { | |
| 70 | return alloc_cpu_rmap(size, GFP_KERNEL); | |
| 71 | } | |
| 72 | extern void free_irq_cpu_rmap(struct cpu_rmap *rmap); | |
| 73 | ||
| 74 | extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq); | |
| 75 | ||
| 76 | #endif | |
| 122733a1 | 77 | #endif /* __LINUX_CPU_RMAP_H */ |