perf/x86/intel: Add Intel Cache QoS Monitoring support

Future Intel Xeon processors support a Cache QoS Monitoring feature that
allows tracking of the LLC occupancy for a task or task group, i.e. the
amount of data in pulled into the LLC for the task (group).

Currently the PMU only supports per-cpu events. We create an event for
each cpu and read out all the LLC occupancy values.

Because this results in duplicate values being written out to userspace,
we also export a .per-pkg event file so that the perf tools only
accumulate values for one cpu per package.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kanaka Juvva <kanaka.d.juvva@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Link: http://lkml.kernel.org/r/1422038748-21397-6-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>