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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/perf/include/bpf/bpf.h
..
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@@ -18,6 +18,35 @@
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         unsigned int numa_node;
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 };
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+#define bpf_map(name, _type, type_key, type_val, _max_entries)	\
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+struct bpf_map SEC("maps") name = {				\
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+	.type	     = BPF_MAP_TYPE_##_type,			\
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+	.key_size    = sizeof(type_key),			\
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+	.value_size  = sizeof(type_val),			\
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+	.max_entries = _max_entries,				\
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+};								\
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+struct ____btf_map_##name {					\
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+	type_key key;						\
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+	type_val value;                                 	\
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+};								\
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+struct ____btf_map_##name __attribute__((section(".maps." #name), used)) \
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+	____btf_map_##name = { }
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+
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+/*
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+ * FIXME: this should receive .max_entries as a parameter, as careful
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+ *	  tuning of these limits is needed to avoid hitting limits that
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+ *	  prevents other BPF constructs, such as tracepoint handlers,
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+ *	  to get installed, with cryptic messages from libbpf, etc.
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+ *	  For the current need, 'perf trace --filter-pids', 64 should
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+ *	  be good enough, but this surely needs to be revisited.
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+ */
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+#define pid_map(name, value_type) bpf_map(name, HASH, pid_t, value_type, 64)
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+
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+static int (*bpf_map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags) = (void *)BPF_FUNC_map_update_elem;
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+static void *(*bpf_map_lookup_elem)(struct bpf_map *map, void *key) = (void *)BPF_FUNC_map_lookup_elem;
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+
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+static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *)BPF_FUNC_tail_call;
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+
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 #define SEC(NAME) __attribute__((section(NAME),  used))
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 #define probe(function, vars) \
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@@ -26,6 +55,9 @@
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 #define syscall_enter(name) \
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 	SEC("syscalls:sys_enter_" #name) syscall_enter_ ## name
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+#define syscall_exit(name) \
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+	SEC("syscalls:sys_exit_" #name) syscall_exit_ ## name
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+
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 #define license(name) \
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 char _license[] SEC("license") = #name; \
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 int _version SEC("version") = LINUX_VERSION_CODE;
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@@ -33,4 +65,6 @@
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 static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read;
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 static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str;
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+static int (*perf_event_output)(void *, struct bpf_map *, int, void *, unsigned long) = (void *)BPF_FUNC_perf_event_output;
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+
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 #endif /* _PERF_BPF_H */