linux-kernel - [PATCH 0/6] perf: Driver specific configuration for PMU

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Message-Id: <1468968836-12695-1-git-send-email-mathieu.poirier@linaro.org>
Date:	Tue, 19 Jul 2016 16:53:50 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, jolsa@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 0/6] perf: Driver specific configuration for PMU 

This patchset adds the possiblity of specifying PMU driver configuration
directly from the perf command line.  Anything that falls within the
event specifiers '/.../' and that is preceeded by the '@' symbol is
treated as a configurable.  Two formats are supported, @cfg and
@cfg=config.

For example:

perf record -e some_event/@...1/ ...

or

perf record -e some_event/@...2=config/ ...

or

perf record -e some_event/@...1,@cfg2=config/ ...

The above are all valid configuration and will see the strings 'cfg1'
and 'cfg2=config' sent to the PMU driver for parsing and interpretation
using the existing ioctl() mechanism.

The primary customers for this feature are the CoreSight drivers where
the selection of a sink (where trace data is accumulated) needs to be
done in a previous, and separated step, from the launching of the perf
command.

As such something that used to be a two-step process:

# echo 1 > /sys/bus/coresight/devices/20070000.etr/enable_sink
# perf record -e cs_etm//u --per-thread  uname

is integrated in a single command:

# perf record -e cs_etm/@...k=20070000.etr/u --per-thread  uname

The patches include both the kernel and user space part so that the
solution is complete and found in a single place.

Last but not least it is based on 4.7-rc7 assumes that these
patches [1] have been applied.

Thanks,
Mathieu

[1]. https://lkml.org/lkml/2016/7/14/642

Mathieu Poirier (6):
  perf/core: Adding PMU driver specific configuration
  perf: Passing struct perf_event to function setup_aux()
  perf tools: add infrastructure for PMU specific configuration
  perf tools: pushing driver configuration down to the kernel
  coresight: adding sink parameter to function coresight_build_path()
  coresight: etm-perf: incorporating sink definition from cmd line

 arch/x86/events/intel/bts.c                      |   4 +-
 arch/x86/events/intel/pt.c                       |   5 +-
 drivers/hwtracing/coresight/coresight-etm-perf.c | 105 ++++++++++++++++++++++-
 drivers/hwtracing/coresight/coresight-priv.h     |   3 +-
 drivers/hwtracing/coresight/coresight.c          |  40 ++++++---
 include/linux/perf_event.h                       |  11 ++-
 include/uapi/linux/perf_event.h                  |   1 +
 kernel/events/core.c                             |  16 ++++
 kernel/events/ring_buffer.c                      |   2 +-
 tools/perf/builtin-record.c                      |   9 ++
 tools/perf/util/evlist.c                         |  24 ++++++
 tools/perf/util/evlist.h                         |   3 +
 tools/perf/util/evsel.c                          |  33 +++++++
 tools/perf/util/evsel.h                          |   7 ++
 tools/perf/util/parse-events.c                   |  67 +++++++++++----
 tools/perf/util/parse-events.h                   |   1 +
 tools/perf/util/parse-events.l                   |  12 +++
 tools/perf/util/parse-events.y                   |  11 +++
 18 files changed, 314 insertions(+), 40 deletions(-)

-- 
2.7.4