| Dave Marchevsky | 6ac22d0 | 2021-10-11 01:20:30 -0700 | [diff] [blame] | 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 */ |