1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 3 #ifndef __PERF_BPF_UTILS_H 4 #define __PERF_BPF_UTILS_H 5 6 #define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr)) 7 8 #ifdef HAVE_LIBBPF_SUPPORT 9 10 #include <bpf/libbpf.h> 11 12 /* 13 * Get bpf_prog_info in continuous memory 14 * 15 * struct bpf_prog_info has multiple arrays. The user has option to choose 16 * arrays to fetch from kernel. The following APIs provide an uniform way to 17 * fetch these data. All arrays in bpf_prog_info are stored in a single 18 * continuous memory region. This makes it easy to store the info in a 19 * file. 20 * 21 * Before writing perf_bpil to files, it is necessary to 22 * translate pointers in bpf_prog_info to offsets. Helper functions 23 * 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 file 34 * bpil_addr_to_offs(info_linear); 35 * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len); 36 * 37 * # To read data from file 38 * read(f, info_linear, <proper_size>); 39 * bpil_offs_to_addr(info_linear); 40 */ 41 enum 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 55 struct 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 66 struct perf_bpil * 67 get_bpf_prog_info_linear(int fd, __u64 arrays); 68 69 void 70 bpil_addr_to_offs(struct perf_bpil *info_linear); 71 72 void 73 bpil_offs_to_addr(struct perf_bpil *info_linear); 74 75 #endif /* HAVE_LIBBPF_SUPPORT */ 76 #endif /* __PERF_BPF_UTILS_H */ 77