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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __PERF_BPF_UTILS_H
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#define __PERF_BPF_UTILS_H
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#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
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#ifdef HAVE_LIBBPF_SUPPORT
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#include <bpf/libbpf.h>
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/*
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* Get bpf_prog_info in continuous memory
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*
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* struct bpf_prog_info has multiple arrays. The user has option to choose
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* arrays to fetch from kernel. The following APIs provide an uniform way to
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* fetch these data. All arrays in bpf_prog_info are stored in a single
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* continuous memory region. This makes it easy to store the info in a
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* file.
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*
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* Before writing perf_bpil to files, it is necessary to
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* translate pointers in bpf_prog_info to offsets. Helper functions
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* bpil_addr_to_offs() and bpil_offs_to_addr()
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* are introduced to switch between pointers and offsets.
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*
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* Examples:
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* # To fetch map_ids and prog_tags:
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* __u64 arrays = (1UL << PERF_BPIL_MAP_IDS) |
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* (1UL << PERF_BPIL_PROG_TAGS);
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* struct perf_bpil *info_linear =
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* get_bpf_prog_info_linear(fd, arrays);
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*
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* # To save data in file
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* bpil_addr_to_offs(info_linear);
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* write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
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*
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* # To read data from file
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* read(f, info_linear, <proper_size>);
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* bpil_offs_to_addr(info_linear);
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*/
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enum perf_bpil_array_types {
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PERF_BPIL_FIRST_ARRAY = 0,
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PERF_BPIL_JITED_INSNS = 0,
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PERF_BPIL_XLATED_INSNS,
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PERF_BPIL_MAP_IDS,
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PERF_BPIL_JITED_KSYMS,
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PERF_BPIL_JITED_FUNC_LENS,
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PERF_BPIL_FUNC_INFO,
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PERF_BPIL_LINE_INFO,
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PERF_BPIL_JITED_LINE_INFO,
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PERF_BPIL_PROG_TAGS,
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PERF_BPIL_LAST_ARRAY,
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};
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struct perf_bpil {
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/* size of struct bpf_prog_info, when the tool is compiled */
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__u32 info_len;
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/* total bytes allocated for data, round up to 8 bytes */
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__u32 data_len;
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/* which arrays are included in data */
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__u64 arrays;
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struct bpf_prog_info info;
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__u8 data[];
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};
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struct perf_bpil *
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get_bpf_prog_info_linear(int fd, __u64 arrays);
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void
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bpil_addr_to_offs(struct perf_bpil *info_linear);
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void
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bpil_offs_to_addr(struct perf_bpil *info_linear);
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#endif /* HAVE_LIBBPF_SUPPORT */
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#endif /* __PERF_BPF_UTILS_H */
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