tracing: Expose tracepoint BTF ids via tracefs#7797
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Drop the static qualifier and add prototypes to <linux/btf.h> so the tracing core can look up module BTF and translate ids stored by resolve_btfids (which are local to a module's split BTF) into the runtime ids used by the kernel. Used by the upcoming events/<sys>/<event>/btf_ids tracefs interface. Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Add events/<sys>/<event>/btf_ids, a per-template file that exposes
the BTF ids resolve_btfids fills in for each tracepoint:
btf_obj_id BTF object owning the ids below
raw_btf_id FUNC_PROTO of __bpf_trace_<call> (named args), consumed
by raw_tp / tp_btf BPF programs
tp_btf_id trace_event_raw_<call> ring-buffer record, consumed by
classic BPF_PROG_TYPE_TRACEPOINT programs
DECLARE_EVENT_CLASS now emits a 2-entry BTF_ID_LIST (FUNC __bpf_trace_*
and STRUCT trace_event_raw_*) and stores the pointer in
trace_event_class.
Per-syscall events under syscalls/ share the handcrafted classes
event_class_syscall_{enter,exit} instead of going through
DECLARE_EVENT_CLASS. Wire those classes to the BTF id lists
generated for sys_enter / sys_exit so all ~700 per-syscall
events expose the shared dispatcher prototype and record.
The per-syscall events do not own their own tracepoint
(they share sys_enter/sys_exit), so raw_btf_id is reported as 0
on those events; the meaningful raw_btf_id is exposed on
raw_syscalls/sys_{enter,exit}/btf_ids where raw_tp / tp_btf
programs can actually attach.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Read events/bpf_testmod/bpf_testmod_test_read/btf_ids and verify the exported FUNC_PROTO matches the testmod tracepoint signature (__data, struct task_struct *task, struct bpf_testmod_test_read_ctx *ctx) and the record struct trace_event_raw_bpf_testmod_test_read carries the fields declared by TP_STRUCT__entry. Use the testmod tracepoint so the test exercises the module/split-BTF path (btf_relocate_id) rather than vmlinux only, and falls back from /sys/kernel/tracing to /sys/kernel/debug/tracing when tracefs is not mounted at the new location. Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
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Pull request for series with
subject: tracing: Expose tracepoint BTF ids via tracefs
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1096695