perf tools: Use pmus to describe type from attribute

When dumping a perf_event_attr, use pmus to find the PMU and its name
by the type number. This allows dynamically added PMUs to be described.

Before:

  $ perf stat -vv -e data_read true
  ...
  perf_event_attr:
    type                             24
    size                             136
    config                           0x20ff
    sample_type                      IDENTIFIER
    read_format                      TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
    disabled                         1
    inherit                          1
    exclude_guest                    1
  ...

After:

  $ perf stat -vv -e data_read true
  ...
  perf_event_attr:
    type                             24 (uncore_imc_free_running_0)
    size                             136
    config                           0x20ff
    sample_type                      IDENTIFIER
    read_format                      TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
    disabled                         1
    inherit                          1
    exclude_guest                    1
  ...

However, it also means that when we have a PMU name we prefer it to a
hard coded name:

Before:

  $ perf stat -vv -e faults true
  ...
  perf_event_attr:
    type                             1 (PERF_TYPE_SOFTWARE)
    size                             136
    config                           0x2 (PERF_COUNT_SW_PAGE_FAULTS)
    sample_type                      IDENTIFIER
    read_format                      TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
    disabled                         1
    inherit                          1
    enable_on_exec                   1
    exclude_guest                    1
  ...

After:

  $ perf stat -vv -e faults true
  ...
  perf_event_attr:
    type                             1 (software)
    size                             136
    config                           0x2 (PERF_COUNT_SW_PAGE_FAULTS)
    sample_type                      IDENTIFIER
    read_format                      TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
    disabled                         1
    inherit                          1
    enable_on_exec                   1
    exclude_guest                    1
  ...

It feels more consistent to do this, rather than only prefer a PMU
name when a hard coded name isn't available.

Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Tested-by: Kan Liang <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Yang Jihong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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