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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/include/bpf/bpf.h | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/include/bpf/bpf.h')
-rw-r--r-- | tools/perf/include/bpf/bpf.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/tools/perf/include/bpf/bpf.h b/tools/perf/include/bpf/bpf.h new file mode 100644 index 000000000..b422aeef5 --- /dev/null +++ b/tools/perf/include/bpf/bpf.h @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef _PERF_BPF_H +#define _PERF_BPF_H + +#include <uapi/linux/bpf.h> + +/* + * A helper structure used by eBPF C program to describe map attributes to + * elf_bpf loader, taken from tools/testing/selftests/bpf/bpf_helpers.h: + */ +struct bpf_map { + unsigned int type; + unsigned int key_size; + unsigned int value_size; + unsigned int max_entries; + unsigned int map_flags; + unsigned int inner_map_idx; + unsigned int numa_node; +}; + +#define bpf_map(name, _type, type_key, type_val, _max_entries) \ +struct bpf_map SEC("maps") name = { \ + .type = BPF_MAP_TYPE_##_type, \ + .key_size = sizeof(type_key), \ + .value_size = sizeof(type_val), \ + .max_entries = _max_entries, \ +}; \ +struct ____btf_map_##name { \ + type_key key; \ + type_val value; \ +}; \ +struct ____btf_map_##name __attribute__((section(".maps." #name), used)) \ + ____btf_map_##name = { } + +/* + * FIXME: this should receive .max_entries as a parameter, as careful + * tuning of these limits is needed to avoid hitting limits that + * prevents other BPF constructs, such as tracepoint handlers, + * to get installed, with cryptic messages from libbpf, etc. + * For the current need, 'perf trace --filter-pids', 64 should + * be good enough, but this surely needs to be revisited. + */ +#define pid_map(name, value_type) bpf_map(name, HASH, pid_t, value_type, 64) + +static int (*bpf_map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags) = (void *)BPF_FUNC_map_update_elem; +static void *(*bpf_map_lookup_elem)(struct bpf_map *map, void *key) = (void *)BPF_FUNC_map_lookup_elem; + +static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *)BPF_FUNC_tail_call; + +#define SEC(NAME) __attribute__((section(NAME), used)) + +#define probe(function, vars) \ + SEC(#function "=" #function " " #vars) function + +#define syscall_enter(name) \ + SEC("syscalls:sys_enter_" #name) syscall_enter_ ## name + +#define syscall_exit(name) \ + SEC("syscalls:sys_exit_" #name) syscall_exit_ ## name + +#define license(name) \ +char _license[] SEC("license") = #name; \ +int _version SEC("version") = LINUX_VERSION_CODE; + +static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read; +static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str; + +static int (*perf_event_output)(void *, struct bpf_map *, int, void *, unsigned long) = (void *)BPF_FUNC_perf_event_output; + +#endif /* _PERF_BPF_H */ |