| 1 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
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| 2 | |
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| 3 | #ifndef __PERF_BPF_UTILS_H |
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| 4 | #define __PERF_BPF_UTILS_H |
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| 5 | |
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| 6 | #define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr)) |
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| 7 | |
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| 8 | #ifdef HAVE_LIBBPF_SUPPORT |
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| 9 | |
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| 10 | #include <bpf/libbpf.h> |
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| 11 | |
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| 12 | /* |
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| 13 | * Get bpf_prog_info in continuous memory |
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| 14 | * |
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| 15 | * struct bpf_prog_info has multiple arrays. The user has option to choose |
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| 16 | * arrays to fetch from kernel. The following APIs provide an uniform way to |
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| 17 | * fetch these data. All arrays in bpf_prog_info are stored in a single |
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| 18 | * continuous memory region. This makes it easy to store the info in a |
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| 19 | * file. |
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| 20 | * |
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| 21 | * Before writing perf_bpil to files, it is necessary to |
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| 22 | * translate pointers in bpf_prog_info to offsets. Helper functions |
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| 23 | * bpil_addr_to_offs() and bpil_offs_to_addr() |
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| 24 | * are introduced to switch between pointers and offsets. |
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| 25 | * |
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| 26 | * Examples: |
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| 27 | * # To fetch map_ids and prog_tags: |
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| 28 | * __u64 arrays = (1UL << PERF_BPIL_MAP_IDS) | |
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| 29 | * (1UL << PERF_BPIL_PROG_TAGS); |
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| 30 | * struct perf_bpil *info_linear = |
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| 31 | * get_bpf_prog_info_linear(fd, arrays); |
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| 32 | * |
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| 33 | * # To save data in file |
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| 34 | * bpil_addr_to_offs(info_linear); |
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| 35 | * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len); |
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| 36 | * |
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| 37 | * # To read data from file |
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| 38 | * read(f, info_linear, <proper_size>); |
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| 39 | * bpil_offs_to_addr(info_linear); |
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| 40 | */ |
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| 41 | enum perf_bpil_array_types { |
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| 42 | PERF_BPIL_FIRST_ARRAY = 0, |
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| 43 | PERF_BPIL_JITED_INSNS = 0, |
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| 44 | PERF_BPIL_XLATED_INSNS, |
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| 45 | PERF_BPIL_MAP_IDS, |
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| 46 | PERF_BPIL_JITED_KSYMS, |
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| 47 | PERF_BPIL_JITED_FUNC_LENS, |
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| 48 | PERF_BPIL_FUNC_INFO, |
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| 49 | PERF_BPIL_LINE_INFO, |
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| 50 | PERF_BPIL_JITED_LINE_INFO, |
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| 51 | PERF_BPIL_PROG_TAGS, |
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| 52 | PERF_BPIL_LAST_ARRAY, |
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| 53 | }; |
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| 54 | |
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| 55 | struct perf_bpil { |
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| 56 | /* size of struct bpf_prog_info, when the tool is compiled */ |
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| 57 | __u32 info_len; |
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| 58 | /* total bytes allocated for data, round up to 8 bytes */ |
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| 59 | __u32 data_len; |
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| 60 | /* which arrays are included in data */ |
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| 61 | __u64 arrays; |
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| 62 | struct bpf_prog_info info; |
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| 63 | __u8 data[]; |
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| 64 | }; |
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| 65 | |
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| 66 | struct perf_bpil * |
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| 67 | get_bpf_prog_info_linear(int fd, __u64 arrays); |
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| 68 | |
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| 69 | void |
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| 70 | bpil_addr_to_offs(struct perf_bpil *info_linear); |
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| 71 | |
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| 72 | void |
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| 73 | bpil_offs_to_addr(struct perf_bpil *info_linear); |
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| 74 | |
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| 75 | #endif /* HAVE_LIBBPF_SUPPORT */ |
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| 76 | #endif /* __PERF_BPF_UTILS_H */ |
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| 77 | |
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