hi,
this patchset is adding support for session uprobe attachment and
using it through bpf link for bpf programs.

The session means that the uprobe consumer is executed on entry
and return of probed function with additional control:
  - entry callback can control execution of the return callback
  - entry and return callbacks can share data/cookie

On more details please see patch #2.

Kernel uprobe changes are applicable on Peter's perf/core:
  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core

The whole patchset is based on bpf-next/master because the tooling
bits need changes that are not yet merged in peter's tree.

v5 changes:
  - removed IWANTMYCOOKIE return value, instead we pass cookie when both
    'handler' and 'ret_handler' callbacks are defined in consumer [Andrii]
  - move return_consumer_find call under uc->ret_handler check [Oleg] 
  - dropped uprobe stress selftest, don't think it's needed

thanks,
jirka


---
Jiri Olsa (13):
      uprobe: Add data pointer to consumer handlers
      uprobe: Add support for session consumer
      bpf: Add support for uprobe multi session attach
      bpf: Add support for uprobe multi session context
      bpf: Allow return values 0 and 1 for uprobe/kprobe session
      libbpf: Add support for uprobe multi session attach
      selftests/bpf: Add uprobe session test
      selftests/bpf: Add uprobe session cookie test
      selftests/bpf: Add uprobe session recursive test
      selftests/bpf: Add uprobe session verifier test for return value
      selftests/bpf: Add kprobe session verifier test for return value
      selftests/bpf: Add uprobe session single consumer test
      selftests/bpf: Add uprobe sessions to consumer test

 include/linux/uprobes.h                                            |  25 +++++++--
 include/uapi/linux/bpf.h                                           |   1 +
 kernel/bpf/syscall.c                                               |   9 +++-
 kernel/bpf/verifier.c                                              |  10 ++++
 kernel/events/uprobes.c                                            | 148 +++++++++++++++++++++++++++++++++++++++++------------
 kernel/trace/bpf_trace.c                                           |  66 +++++++++++++++++-------
 kernel/trace/trace_uprobe.c                                        |  12 +++--
 tools/include/uapi/linux/bpf.h                                     |   1 +
 tools/lib/bpf/bpf.c                                                |   1 +
 tools/lib/bpf/libbpf.c                                             |  22 ++++++--
 tools/lib/bpf/libbpf.h                                             |   4 +-
 tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c              |   2 +-
 tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c         |   2 +
 tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c         | 233 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 tools/testing/selftests/bpf/progs/kprobe_multi_verifier.c          |  31 ++++++++++++
 tools/testing/selftests/bpf/progs/uprobe_multi_consumers.c         |  16 +++++-
 tools/testing/selftests/bpf/progs/uprobe_multi_session.c           |  71 ++++++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c    |  48 ++++++++++++++++++
 tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c |  44 ++++++++++++++++
 tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c    |  44 ++++++++++++++++
 tools/testing/selftests/bpf/progs/uprobe_multi_verifier.c          |  31 ++++++++++++
 21 files changed, 744 insertions(+), 77 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_verifier.c
 create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session.c
 create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c
 create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c
 create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c
 create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_verifier.c