1 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/bpf_mem_alloc.h b/include/linux/bpf_mem_alloc.h
new file mode 100644
index 000000000000..e45162ef59bb
--- /dev/null
+++ b/include/linux/bpf_mem_alloc.h
@@ -0,0 +1,51 @@
+/* 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);
+
+/* Check the allocation size for kmalloc equivalent allocator */
+int bpf_mem_alloc_check_size(bool percpu, size_t size);
+
+/* 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 */