| 1 |
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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 | #include <bpf/libbpf_version.h>
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| 12 |
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| 13 | #define LIBBPF_CURRENT_VERSION_GEQ(major, minor) \
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| 14 | (LIBBPF_MAJOR_VERSION > (major) || \
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| 15 | (LIBBPF_MAJOR_VERSION == (major) && LIBBPF_MINOR_VERSION >= (minor)))
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| 16 |
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| 17 | #if LIBBPF_CURRENT_VERSION_GEQ(1, 7)
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| 18 | |
| 19 | #define HAVE_LIBBPF_STRINGS_SUPPORT 1
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| 20 | #endif
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| 21 |
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| 22 | |
| 23 | * Get bpf_prog_info in continuous memory
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| 24 | *
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| 25 | * struct bpf_prog_info has multiple arrays. The user has option to choose
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| 26 | * arrays to fetch from kernel. The following APIs provide an uniform way to
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| 27 | * fetch these data. All arrays in bpf_prog_info are stored in a single
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| 28 | * continuous memory region. This makes it easy to store the info in a
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| 29 | * file.
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| 30 | *
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| 31 | * Before writing perf_bpil to files, it is necessary to
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| 32 | * translate pointers in bpf_prog_info to offsets. Helper functions
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| 33 | * bpil_addr_to_offs() and bpil_offs_to_addr()
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| 34 | * are introduced to switch between pointers and offsets.
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| 35 | *
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| 36 | * Examples:
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| 37 | * # To fetch map_ids and prog_tags:
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| 38 | * __u64 arrays = (1UL << PERF_BPIL_MAP_IDS) |
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| 39 | * (1UL << PERF_BPIL_PROG_TAGS);
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| 40 | * struct perf_bpil *info_linear =
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| 41 | * get_bpf_prog_info_linear(fd, arrays);
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| 42 | *
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| 43 | * # To save data in file
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| 44 | * bpil_addr_to_offs(info_linear);
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| 45 | * write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
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| 46 | *
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| 47 | * # To read data from file
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| 48 | * read(f, info_linear, <proper_size>);
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| 49 | * bpil_offs_to_addr(info_linear);
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| 50 |
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| 51 | enum perf_bpil_array_types {
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| 52 | PERF_BPIL_FIRST_ARRAY = 0,
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| 53 | PERF_BPIL_JITED_INSNS = 0,
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| 54 | PERF_BPIL_XLATED_INSNS,
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| 55 | PERF_BPIL_MAP_IDS,
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| 56 | PERF_BPIL_JITED_KSYMS,
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| 57 | PERF_BPIL_JITED_FUNC_LENS,
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| 58 | PERF_BPIL_FUNC_INFO,
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| 59 | PERF_BPIL_LINE_INFO,
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| 60 | PERF_BPIL_JITED_LINE_INFO,
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| 61 | PERF_BPIL_PROG_TAGS,
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| 62 | PERF_BPIL_LAST_ARRAY,
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| 63 | };
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| 64 |
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| 65 | struct perf_bpil {
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| 66 |
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| 67 | __u32 info_len;
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| 68 |
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| 69 | __u32 data_len;
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| 70 |
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| 71 | __u64 arrays;
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| 72 | struct bpf_prog_info info;
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| 73 | __u8 data[];
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| 74 | };
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| 75 |
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| 76 | struct perf_bpil *
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| 77 | get_bpf_prog_info_linear(int fd, __u64 arrays);
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| 78 |
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| 79 | void
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| 80 | bpil_addr_to_offs(struct perf_bpil *info_linear);
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| 81 |
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| 82 | void
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| 83 | bpil_offs_to_addr(struct perf_bpil *info_linear);
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| 84 |
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| 85 | #endif
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| 86 | #endif
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