projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
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1 | #ifndef __LINUX_CPU_RMAP_H |
| 2 | #define __LINUX_CPU_RMAP_H | |
| 3 | ||
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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> | |
| 896f97ea | 16 | #include <linux/kref.h> |
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17 | |
| 18 | /** | |
| 19 | * struct cpu_rmap - CPU affinity reverse-map | |
| 896f97ea | 20 | * @refcount: kref for object |
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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 | |
| 26 | */ | |
| 27 | struct cpu_rmap { | |
| 896f97ea | 28 | struct kref refcount; |
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29 | u16 size, used; |
| 30 | void **obj; | |
| 31 | struct { | |
| 32 | u16 index; | |
| 33 | u16 dist; | |
| 34 | } near[0]; | |
| 35 | }; | |
| 36 | #define CPU_RMAP_DIST_INF 0xffff | |
| 37 | ||
| 38 | extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags); | |
| 896f97ea | 39 | extern int cpu_rmap_put(struct cpu_rmap *rmap); |
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40 | |
| 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); | |
| 44 | ||
| 45 | static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu) | |
| 46 | { | |
| 47 | return rmap->near[cpu].index; | |
| 48 | } | |
| 49 | ||
| 50 | static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu) | |
| 51 | { | |
| 52 | return rmap->obj[rmap->near[cpu].index]; | |
| 53 | } | |
| 54 | ||
| 55 | #ifdef CONFIG_GENERIC_HARDIRQS | |
| 56 | ||
| 57 | /** | |
| 58 | * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs | |
| 59 | * @size: Number of objects to be mapped | |
| 60 | * | |
| 61 | * Must be called in process context. | |
| 62 | */ | |
| 63 | static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size) | |
| 64 | { | |
| 65 | return alloc_cpu_rmap(size, GFP_KERNEL); | |
| 66 | } | |
| 67 | extern void free_irq_cpu_rmap(struct cpu_rmap *rmap); | |
| 68 | ||
| 69 | extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq); | |
| 70 | ||
| 71 | #endif | |
| 122733a1 | 72 | #endif /* __LINUX_CPU_RMAP_H */ |