[PATCH v5 0/4] perf/x86/amd: add LBR capture support outside of hardware events

[Andrii Nakryiko]

Add AMD-specific implementation of perf_snapshot_branch_stack static call that
allows LBR capture from arbitrary points in the kernel. This is utilized by
BPF programs. See patch #3 for all the details.

Patches #1 and #2 are preparatory steps to ensure LBR freezing is completely
inlined and have no branches, to minimize LBR snapshot contamination.

Patch #4 removes an artificial restriction on perf events with LBR enabled.

v4->v5:
  - rebased on top of perf/urgent branch to resolve conflicts with
    598c2fafc06f ("perf/x86/amd/lbr: Use freeze based on availability").

Andrii Nakryiko (4):
  perf/x86/amd: ensure amd_pmu_core_disable_all() is always inlined
  perf/x86/amd: avoid taking branches before disabling LBR
  perf/x86/amd: support capturing LBR from software events
  perf/x86/amd: don't reject non-sampling events with configured LBR

 arch/x86/events/amd/core.c   | 37 +++++++++++++++++++++++++++++++++++-
 arch/x86/events/amd/lbr.c    | 13 +------------
 arch/x86/events/perf_event.h | 13 +++++++++++++
 3 files changed, 50 insertions(+), 13 deletions(-)

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2.43.0