[PATCH V5 0/4] powerpc/perf: Add support for perf extended regs in powerpc

[Athira Rajeev]

Patch set to add support for perf extended register capability in
powerpc. The capability flag PERF_PMU_CAP_EXTENDED_REGS, is used to
indicate the PMU which support extended registers. The generic code
define the mask of extended registers as 0 for non supported architectures.

Patches 1 and 2 are the kernel side changes needed to include
base support for extended regs in powerpc and in power10.
Patches 3 and 4 are the perf tools side changes needed to support the
extended registers.

patch 1/4 defines the PERF_PMU_CAP_EXTENDED_REGS mask to output the
values of mmcr0,mmcr1,mmcr2 for POWER9. Defines `PERF_REG_EXTENDED_MASK`
at runtime which contains mask value of the supported registers under
extended regs.

patch 2/4 adds the extended regs support for power10 and exposes
MMCR3, SIER2, SIER3 registers as part of extended regs.

Patch 3/4 and 4/4 adds extended regs to sample_reg_mask in the tool
side to use with `-I?` option for power9 and power10 respectively.

Ravi bangoria found an issue with `perf record -I` while testing the
changes. The same issue is currently being worked on here:
https://lkml.org/lkml/2020/7/19/413 and will be resolved once fix
from Jin Yao is merged.

This patch series is based on powerpc/next

Changelog:

Changes from v4 -> v5
- initialize `perf_reg_extended_max` to work on
  all platforms as suggested by Ravi Bangoria
- Added Reviewed-and-Tested-by from Ravi Bangoria

Changes from v3 -> v4
- Split the series and send extended regs as separate patch set here.
  Link to previous series :
  https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=190462&state=*
  Other PMU patches are already merged in powerpc/next.

- Fixed kernel build issue when using config having
  CONFIG_PERF_EVENTS set and without CONFIG_PPC_PERF_CTRS
  reported by kernel build bot.
- Included Reviewed-by from Kajol Jain.
- Addressed review comments from Ravi Bangoria to initialize `perf_reg_extended_max`
  and define it in lowercase since it is local variable.

Anju T Sudhakar (2):
  powerpc/perf: Add support for outputting extended regs in perf
    intr_regs
  tools/perf: Add perf tools support for extended register capability in
    powerpc

Athira Rajeev (2):
  powerpc/perf: Add extended regs support for power10 platform
  tools/perf: Add perf tools support for extended regs in power10

 arch/powerpc/include/asm/perf_event.h           |  3 ++
 arch/powerpc/include/asm/perf_event_server.h    |  5 +++
 arch/powerpc/include/uapi/asm/perf_regs.h       | 20 ++++++++-
 arch/powerpc/perf/core-book3s.c                 |  1 +
 arch/powerpc/perf/perf_regs.c                   | 44 ++++++++++++++++++--
 arch/powerpc/perf/power10-pmu.c                 |  6 +++
 arch/powerpc/perf/power9-pmu.c                  |  6 +++
 tools/arch/powerpc/include/uapi/asm/perf_regs.h | 20 ++++++++-
 tools/perf/arch/powerpc/include/perf_regs.h     |  8 +++-
 tools/perf/arch/powerpc/util/header.c           |  9 +---
 tools/perf/arch/powerpc/util/perf_regs.c        | 55 +++++++++++++++++++++++++
 tools/perf/arch/powerpc/util/utils_header.h     | 15 +++++++
 12 files changed, 178 insertions(+), 14 deletions(-)
 create mode 100644 tools/perf/arch/powerpc/util/utils_header.h

-- 
1.8.3.1