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66 lines
1.7 KiB
66 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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#ifndef __LINUX_CPU_RMAP_H |
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#define __LINUX_CPU_RMAP_H |
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/* |
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* cpu_rmap.c: CPU affinity reverse-map support |
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* Copyright 2011 Solarflare Communications Inc. |
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*/ |
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#include <linux/cpumask.h> |
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#include <linux/gfp.h> |
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#include <linux/slab.h> |
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#include <linux/kref.h> |
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/** |
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* struct cpu_rmap - CPU affinity reverse-map |
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* @refcount: kref for object |
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* @size: Number of objects to be reverse-mapped |
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* @used: Number of objects added |
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* @obj: Pointer to array of object pointers |
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* @near: For each CPU, the index and distance to the nearest object, |
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* based on affinity masks |
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*/ |
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struct cpu_rmap { |
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struct kref refcount; |
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u16 size, used; |
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void **obj; |
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struct { |
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u16 index; |
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u16 dist; |
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} near[]; |
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}; |
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#define CPU_RMAP_DIST_INF 0xffff |
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extern struct cpu_rmap *alloc_cpu_rmap(unsigned int size, gfp_t flags); |
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extern int cpu_rmap_put(struct cpu_rmap *rmap); |
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extern int cpu_rmap_add(struct cpu_rmap *rmap, void *obj); |
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extern int cpu_rmap_update(struct cpu_rmap *rmap, u16 index, |
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const struct cpumask *affinity); |
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static inline u16 cpu_rmap_lookup_index(struct cpu_rmap *rmap, unsigned int cpu) |
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{ |
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return rmap->near[cpu].index; |
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} |
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static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu) |
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{ |
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return rmap->obj[rmap->near[cpu].index]; |
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} |
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/** |
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* alloc_irq_cpu_rmap - allocate CPU affinity reverse-map for IRQs |
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* @size: Number of objects to be mapped |
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* |
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* Must be called in process context. |
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*/ |
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static inline struct cpu_rmap *alloc_irq_cpu_rmap(unsigned int size) |
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{ |
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return alloc_cpu_rmap(size, GFP_KERNEL); |
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} |
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extern void free_irq_cpu_rmap(struct cpu_rmap *rmap); |
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extern int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq); |
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#endif /* __LINUX_CPU_RMAP_H */
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