[PATCH v5 0/6]: Make 24x7 and GPCI events available in sysfs

[Sukadev Bhattiprolu]

The current support for the 24x7 and GPCI counters in the kernel requires
users to specify the domain and offset of the event numerically, which is
obviously hard to use:

    perf stat -C 0 -e	\
        'hv_24x7/domain=2,offset=0xd58,starting_index=0,lpar=0xffffffff/' \
	sleep 1

This patchset exports the 24x7 and GPCI counters info in sysfs so users can
specify the events by name:

    $ cd /sys/bus/event_source/devices/hv_24x7/events

    $ cat HPM_CS_FROM_L4_LDATA__PHYS_CORE
    domain=0x2,offset=0xd58,starting_index=$core,lpar=0x0

    $ cat HPM_TLBIE__VCPU_HOME_CHIP
    domain=0x4,offset=0x358,starting_index=$vcpu,lpar=$sibling_guest_id

    perf stat -C 0 -e \
        'hv_24x7/HPM_CS_FROM_L4_LDATA__PHYS_CORE,starting_index=0'
        sleep 1

This patchset adds the kernel support to export events in sysfs.  A follow-on
patchset will add support to the perf tool to parse the event parameters like
'lpar=$sibling_guest_id' and display them via 'perf list'.

Changelog[v5]
	- [Jiri Olsa, Peter Zijlstra] Use '$arg' notation rather than ?
	  to indicate event parameters.
	- [Michael Ellerman] Separate the kernel and tool patches in the
	  patchset into different patchsets.

Changelog[v4]
	- [Jiri Olsa Rebase to perf/core tree to fix small merge conflict.

Changelog[v3]
        - [Jiri Olsa] Changed the event parameters are specified. If
          event file specifes 'param=val' make the usage 'param=123'
          rather than 'val=123'. (patch 1,2/10)
        - Shortened event names using "PHYS" and "VCPU" (patch 4/10)
        - Print help message if invalid parameter is specified or required
          parameter is missing.
        - Moved 3 patches that are unrelated to parametrized events into
          a separate patchset.
        - Reordered patches so code changes come first.

Changelog[v2]
        - [Joe Perches, David Laight] Use beNN_to_cpu() instead of guessing
          the size from type.
        - Use kmem_cache_free() to free page allocated with kmem_cache_alloc().
        - Rebase to recent kernel


Cody P Schafer (6):
  perf: provide sysfs_show for struct perf_pmu_events_attr
  perf: add PMU_EVENT_ATTR_STRING() helper
  powerpc/perf/hv-24x7: parse catalog and populate sysfs with events
  powerpc/perf/{hv-gpci, hv-common}: generate requests with counters
    annotated
  powerpc/perf/hv-gpci: add the remaining gpci requests
  powerpc/perf/hv-24x7: Document sysfs event description entries

 .../testing/sysfs-bus-event_source-devices-hv_24x7 |  22 +
 arch/powerpc/perf/hv-24x7-catalog.h                |  25 +
 arch/powerpc/perf/hv-24x7-domains.h                |  28 +
 arch/powerpc/perf/hv-24x7.c                        | 787 ++++++++++++++++++++-
 arch/powerpc/perf/hv-24x7.h                        |  12 +-
 arch/powerpc/perf/hv-common.c                      |  10 +-
 arch/powerpc/perf/hv-gpci-requests.h               | 262 +++++++
 arch/powerpc/perf/hv-gpci.c                        |   8 +
 arch/powerpc/perf/hv-gpci.h                        |  37 +-
 arch/powerpc/perf/req-gen/_begin.h                 |  13 +
 arch/powerpc/perf/req-gen/_clear.h                 |   5 +
 arch/powerpc/perf/req-gen/_end.h                   |   4 +
 arch/powerpc/perf/req-gen/_request-begin.h         |  15 +
 arch/powerpc/perf/req-gen/_request-end.h           |   8 +
 arch/powerpc/perf/req-gen/perf.h                   | 155 ++++
 include/linux/perf_event.h                         |  10 +
 kernel/events/core.c                               |   8 +
 17 files changed, 1365 insertions(+), 44 deletions(-)
 create mode 100644 arch/powerpc/perf/hv-24x7-domains.h
 create mode 100644 arch/powerpc/perf/hv-gpci-requests.h
 create mode 100644 arch/powerpc/perf/req-gen/_begin.h
 create mode 100644 arch/powerpc/perf/req-gen/_clear.h
 create mode 100644 arch/powerpc/perf/req-gen/_end.h
 create mode 100644 arch/powerpc/perf/req-gen/_request-begin.h
 create mode 100644 arch/powerpc/perf/req-gen/_request-end.h
 create mode 100644 arch/powerpc/perf/req-gen/perf.h

-- 
1.8.3.1

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