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bpf_mem_alloc.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ #ifndef _BPF_MEM_ALLOC_H #define _BPF_MEM_ALLOC_H #include <linux/compiler_types.h> #include <linux/workqueue.h> struct bpf_mem_cache; struct bpf_mem_caches; struct bpf_mem_alloc { struct bpf_mem_caches __percpu *caches; struct bpf_mem_cache __percpu *cache; struct obj_cgroup *objcg; bool percpu; struct work_struct work; }; /* 'size != 0' is for bpf_mem_alloc which manages fixed-size objects. * Alloc and free are done with bpf_mem_cache_{alloc,free}(). * * 'size = 0' is for bpf_mem_alloc which manages many fixed-size objects. * Alloc and free are done with bpf_mem_{alloc,free}() and the size of * the returned object is given by the size argument of bpf_mem_alloc(). * If percpu equals true, error will be returned in order to avoid * large memory consumption and the below bpf_mem_alloc_percpu_unit_init() * should be used to do on-demand per-cpu allocation for each size. */ int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu); /* Initialize a non-fix-size percpu memory allocator */ int bpf_mem_alloc_percpu_init(struct bpf_mem_alloc *ma, struct obj_cgroup *objcg); /* The percpu allocation with a specific unit size. */ int bpf_mem_alloc_percpu_unit_init(struct bpf_mem_alloc *ma, int size); void bpf_mem_alloc_destroy(struct bpf_mem_alloc *ma); /* kmalloc/kfree equivalent: */ void *bpf_mem_alloc(struct bpf_mem_alloc *ma, size_t size); void bpf_mem_free(struct bpf_mem_alloc *ma, void *ptr); void bpf_mem_free_rcu(struct bpf_mem_alloc *ma, void *ptr); /* kmem_cache_alloc/free equivalent: */ void *bpf_mem_cache_alloc(struct bpf_mem_alloc *ma); void bpf_mem_cache_free(struct bpf_mem_alloc *ma, void *ptr); void bpf_mem_cache_free_rcu(struct bpf_mem_alloc *ma, void *ptr); void bpf_mem_cache_raw_free(void *ptr); void *bpf_mem_cache_alloc_flags(struct bpf_mem_alloc *ma, gfp_t flags); #endif /* _BPF_MEM_ALLOC_H */
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