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

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Date:   Wed, 29 Apr 2020 11:34:13 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     mpe@...erman.id.au, anju@...ux.vnet.ibm.com, acme@...nel.org,
        linux-kernel@...r.kernel.org, maddy@...ux.vnet.ibm.com,
        ravi.bangoria@...ux.ibm.com, jolsa@...nel.org
Subject: [PATCH 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 2/2 defines this PERF_PMU_CAP_EXTENDED_REGS mask to output the
values of mmcr0,mmcr1,mmcr2 for POWER9.                

x86/perf_regs.h is included by util/intel-pt.c, which will get compiled       
when buiding perf on powerpc. Since x86/perf_regs.h has                    
`PERF_EXTENDED_REG_MASK` defined, defining `PERF_EXTENDED_REG_MASK` for       
powerpc to add support for perf extended regs will result in perf build       
error on powerpc. Currently powerpc architecture is not having support
for auxtrace. So as a workaround for this issue, patch 1/2 set
NO_AUXTRACE for powerpc. (Any other solutions are welcome.)

Patch 2/2 also add extended regs to sample_reg_mask in the tool side to use
with `-I?` option.

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

 arch/powerpc/include/asm/perf_event_server.h  |  5 +++
 arch/powerpc/include/uapi/asm/perf_regs.h     | 13 +++++++-
 arch/powerpc/perf/core-book3s.c               |  1 +
 arch/powerpc/perf/perf_regs.c                 | 29 ++++++++++++++--
 arch/powerpc/perf/power9-pmu.c                |  1 +
 .../arch/powerpc/include/uapi/asm/perf_regs.h | 13 +++++++-
 tools/perf/arch/powerpc/Makefile              |  1 +
 tools/perf/arch/powerpc/include/perf_regs.h   |  6 +++-
 tools/perf/arch/powerpc/util/perf_regs.c      | 33 +++++++++++++++++++
 9 files changed, 96 insertions(+), 6 deletions(-)

-- 
2.20.1