1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ 3 #ifndef _BPF_MEM_ALLOC_H 4 #define _BPF_MEM_ALLOC_H 5 #include <linux/compiler_types.h> 6 #include <linux/workqueue.h> 7 8 struct bpf_mem_cache; 9 struct bpf_mem_caches; 10 11 struct bpf_mem_alloc { 12 struct bpf_mem_caches __percpu *caches; 13 struct bpf_mem_cache __percpu *cache; 14 struct obj_cgroup *objcg; 15 bool percpu; 16 struct work_struct work; 17 }; 18 19 /* 'size != 0' is for bpf_mem_alloc which manages fixed-size objects. 20 * Alloc and free are done with bpf_mem_cache_{alloc,free}(). 21 * 22 * 'size = 0' is for bpf_mem_alloc which manages many fixed-size objects. 23 * Alloc and free are done with bpf_mem_{alloc,free}() and the size of 24 * the returned object is given by the size argument of bpf_mem_alloc(). 25 * If percpu equals true, error will be returned in order to avoid 26 * large memory consumption and the below bpf_mem_alloc_percpu_unit_init() 27 * should be used to do on-demand per-cpu allocation for each size. 28 */ 29 int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu); 30 /* Initialize a non-fix-size percpu memory allocator */ 31 int bpf_mem_alloc_percpu_init(struct bpf_mem_alloc *ma, struct obj_cgroup *objcg); 32 /* The percpu allocation with a specific unit size. */ 33 int bpf_mem_alloc_percpu_unit_init(struct bpf_mem_alloc *ma, int size); 34 void bpf_mem_alloc_destroy(struct bpf_mem_alloc *ma); 35 36 /* kmalloc/kfree equivalent: */ 37 void *bpf_mem_alloc(struct bpf_mem_alloc *ma, size_t size); 38 void bpf_mem_free(struct bpf_mem_alloc *ma, void *ptr); 39 void bpf_mem_free_rcu(struct bpf_mem_alloc *ma, void *ptr); 40 41 /* kmem_cache_alloc/free equivalent: */ 42 void *bpf_mem_cache_alloc(struct bpf_mem_alloc *ma); 43 void bpf_mem_cache_free(struct bpf_mem_alloc *ma, void *ptr); 44 void bpf_mem_cache_free_rcu(struct bpf_mem_alloc *ma, void *ptr); 45 void bpf_mem_cache_raw_free(void *ptr); 46 void *bpf_mem_cache_alloc_flags(struct bpf_mem_alloc *ma, gfp_t flags); 47 48 #endif /* _BPF_MEM_ALLOC_H */ 49