linux-kernel - [PATCH V4 0/2] powerpc/perf: Add support for perf extended regs in powerpc

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Date:   Wed, 27 May 2020 05:50:16 -0400
From:   Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, ravi.bangoria@...ux.ibm.com,
        maddy@...ux.vnet.ibm.com, acme@...nel.org, anju@...ux.vnet.ibm.com,
        jolsa@...nel.org, mpe@...erman.id.au, atrajeev@...ux.vnet.ibm.com
Subject: [PATCH V4 0/2] powerpc/perf: Add support for perf extended regs in powerpc

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.

patch 1/2 defines this 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 2/2 adds extended regs to sample_reg_mask in the tool side to use
with `-I?` option.

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

---
Changes from v3 -> v4
- Addressed the comments for new line/tab issue
  and added "Reviewed-by" from Madhavan Srinivasn.

Changes from v2 -> v3
- Split kernel and tools side patches as suggested by Arnaldo
- Addressed review comment from Madhavan Srinivasn

Changes from v1 -> v2

- PERF_REG_EXTENDED_MASK` is defined at runtime in the kernel
based on platform. This will give flexibility in using extended
regs for all processor versions where the supported registers may differ.
- removed PERF_REG_EXTENDED_MASK from the perf tools side. Based on the
processor version(from PVR value), tool side will return the appropriate
extended mask
- Since tool changes can handle without a "PERF_REG_EXTENDED_MASK" macro,
dropped patch to set NO_AUXTRACE.
- Addressed review comments from Ravi Bangoria for V1

---

 arch/powerpc/include/asm/perf_event_server.h    |  8 ++++
 arch/powerpc/include/uapi/asm/perf_regs.h       | 14 ++++++-
 arch/powerpc/perf/core-book3s.c                 |  1 +
 arch/powerpc/perf/perf_regs.c                   | 34 +++++++++++++--
 arch/powerpc/perf/power9-pmu.c                  |  6 +++
 tools/arch/powerpc/include/uapi/asm/perf_regs.h | 14 ++++++-
 tools/perf/arch/powerpc/include/perf_regs.h     |  5 ++-
 tools/perf/arch/powerpc/util/perf_regs.c        | 55 +++++++++++++++++++++++++
 8 files changed, 131 insertions(+), 6 deletions(-)

-- 
1.8.3.1