projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 122733a1 AV |
2 | #ifndef __LINUX_CPU_RMAP_H |
| 3 | #define __LINUX_CPU_RMAP_H | |
| 4 | ||
| c39649c3 BH |
5 | /* |
| 6 | * cpu_rmap.c: CPU affinity reverse-map support | |
| 7 | * Copyright 2011 Solarflare Communications Inc. | |
| c39649c3 BH |
8 | */ |
| 9 | ||
| 10 | #include <linux/cpumask.h> | |
| 11 | #include <linux/gfp.h> | |
| 12 | #include <linux/slab.h> | |
| 896f97ea | 13 | #include <linux/kref.h> |
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14 | |
| 15 | /** | |
| 16 | * struct cpu_rmap - CPU affinity reverse-map | |
| 896f97ea | 17 | * @refcount: kref for object |
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18 | * @size: Number of objects to be reverse-mapped |
| 19 | * @used: Number of objects added | |
| 20 | * @obj: Pointer to array of object pointers | |
| 21 | * @near: For each CPU, the index and distance to the nearest object, | |
| 22 | * based on affinity masks | |
| 23 | */ | |
| 24 | struct cpu_rmap { | |
| 896f97ea | 25 | struct kref refcount; |
| c39649c3 BH |
26 | u16 size, used; |
| 27 | void **obj; | |
| 28 | struct { | |
| 29 | u16 index; | |
| 30 | u16 dist; | |
| 31232272 | 31 | } near[]; |
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32 | }; |
| 33 | #define CPU_RMAP_DIST_INF 0xffff | |
| 34 | ||
| 35 | extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags); | |
| 896f97ea | 36 | extern int cpu_rmap_put(struct cpu_rmap *rmap); |
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37 | |
| 38 | extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj); | |
| 39 | extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index, | |
| 40 | const struct cpumask *affinity); | |
| 41 | ||
| 42 | static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu) | |
| 43 | { | |
| 44 | return rmap->near[cpu].index; | |
| 45 | } | |
| 46 | ||
| 47 | static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu) | |
| 48 | { | |
| 49 | return rmap->obj[rmap->near[cpu].index]; | |
| 50 | } | |
| 51 | ||
| c39649c3 BH |
52 | /** |
| 53 | * alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs | |
| 54 | * @size: Number of objects to be mapped | |
| 55 | * | |
| 56 | * Must be called in process context. | |
| 57 | */ | |
| 58 | static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size) | |
| 59 | { | |
| 60 | return alloc_cpu_rmap(size, GFP_KERNEL); | |
| 61 | } | |
| 62 | extern void free_irq_cpu_rmap(struct cpu_rmap *rmap); | |
| 63 | ||
| 64 | extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq); | |
| 65 | ||
| 122733a1 | 66 | #endif /* __LINUX_CPU_RMAP_H */ |