[PATCH v5 0/9] tracing: Improbe BTF support on probe events

Masami Hiramatsu (Google)
2023-08-07T02:54:33Z

Hi,

Here is the 5th version of series to improve the BTF support on probe events.
The previous series is here:

https://lore.kernel.org/all/169078860386.173706.3091034523220945605.stgit@devnote2/

This version introduces kernel/trace/trace_btf.c to separate the btf generic
functions. These functions will be moved to btf.c next merge window.
This fixes the member-search function to return the bit-offset of the
parent anonymous union/structure. Thus the caller can calculate the real
bit-offset from the root data structure.
This also fixes the ftrace selftest issue which fails if the kernel
supports only BTF args but not support field access.

This series can be applied on top of "probes/core" branch of
https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git/

You can also get this series from:

git://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git topic/fprobe-event-ext

Thank you,

---

Masami Hiramatsu (Google) (9):
tracing/probes: Support BTF argument on module functions
tracing/probes: Move finding func-proto API and getting func-param API to trace_btf
tracing/probes: Add a function to search a member of a struct/union
tracing/probes: Support BTF based data structure field access
tracing/probes: Support BTF field access from $retval
tracing/probes: Add string type check with BTF
tracing/fprobe-event: Assume fprobe is a return event by $retval
selftests/ftrace: Add BTF fields access testcases
Documentation: tracing: Update fprobe event example with BTF field

Documentation/trace/fprobetrace.rst | 64 ++-
include/linux/btf.h | 1
kernel/bpf/btf.c | 2
kernel/trace/Makefile | 1
kernel/trace/trace.c | 3
kernel/trace/trace_btf.c | 109 ++++
kernel/trace/trace_btf.h | 11
kernel/trace/trace_eprobe.c | 4
kernel/trace/trace_fprobe.c | 59 ++
kernel/trace/trace_kprobe.c | 1
kernel/trace/trace_probe.c | 499 +++++++++++++++-----
kernel/trace/trace_probe.h | 27 +
kernel/trace/trace_uprobe.c | 1
.../ftrace/test.d/dynevent/add_remove_btfarg.tc | 20 +
.../ftrace/test.d/dynevent/fprobe_syntax_errors.tc | 10
15 files changed, 637 insertions(+), 175 deletions(-)
create mode 100644 kernel/trace/trace_btf.c
create mode 100644 kernel/trace/trace_btf.h

--
Masami Hiramatsu (Google) <mhiramat@kernel.org>