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1/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */2 3#ifndef __PERF_BPF_UTILS_H4#define __PERF_BPF_UTILS_H5 6#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))7 8#ifdef HAVE_LIBBPF_SUPPORT9 10#include <bpf/libbpf.h>11 12/*13 * Get bpf_prog_info in continuous memory14 *15 * struct bpf_prog_info has multiple arrays. The user has option to choose16 * arrays to fetch from kernel. The following APIs provide an uniform way to17 * fetch these data. All arrays in bpf_prog_info are stored in a single18 * continuous memory region. This makes it easy to store the info in a19 * file.20 *21 * Before writing perf_bpil to files, it is necessary to22 * translate pointers in bpf_prog_info to offsets. Helper functions23 * bpil_addr_to_offs() and bpil_offs_to_addr()24 * are introduced to switch between pointers and offsets.25 *26 * Examples:27 * # To fetch map_ids and prog_tags:28 * __u64 arrays = (1UL << PERF_BPIL_MAP_IDS) |29 * (1UL << PERF_BPIL_PROG_TAGS);30 * struct perf_bpil *info_linear =31 * get_bpf_prog_info_linear(fd, arrays);32 *33 * # To save data in file34 * bpil_addr_to_offs(info_linear);35 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);36 *37 * # To read data from file38 * read(f, info_linear, <proper_size>);39 * bpil_offs_to_addr(info_linear);40 */41enum perf_bpil_array_types {42 PERF_BPIL_FIRST_ARRAY = 0,43 PERF_BPIL_JITED_INSNS = 0,44 PERF_BPIL_XLATED_INSNS,45 PERF_BPIL_MAP_IDS,46 PERF_BPIL_JITED_KSYMS,47 PERF_BPIL_JITED_FUNC_LENS,48 PERF_BPIL_FUNC_INFO,49 PERF_BPIL_LINE_INFO,50 PERF_BPIL_JITED_LINE_INFO,51 PERF_BPIL_PROG_TAGS,52 PERF_BPIL_LAST_ARRAY,53};54 55struct perf_bpil {56 /* size of struct bpf_prog_info, when the tool is compiled */57 __u32 info_len;58 /* total bytes allocated for data, round up to 8 bytes */59 __u32 data_len;60 /* which arrays are included in data */61 __u64 arrays;62 struct bpf_prog_info info;63 __u8 data[];64};65 66struct perf_bpil *67get_bpf_prog_info_linear(int fd, __u64 arrays);68 69void70bpil_addr_to_offs(struct perf_bpil *info_linear);71 72void73bpil_offs_to_addr(struct perf_bpil *info_linear);74 75#endif /* HAVE_LIBBPF_SUPPORT */76#endif /* __PERF_BPF_UTILS_H */77