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Release 4.12 include/linux/cpu_rmap.h

Directory: include/linux
#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; }


Ben Hutchings26100.00%1100.00%

static inline void *cpu_rmap_lookup_obj(struct cpu_rmap *rmap, unsigned int cpu) { return rmap->obj[rmap->near[cpu].index]; }


Ben Hutchings32100.00%1100.00%

/** * 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); }


Ben Hutchings21100.00%1100.00%

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 */

Overall Contributors

Ben Hutchings20191.36%133.33%
David Decotigny125.45%133.33%
Amir Vadai73.18%133.33%
Directory: include/linux
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