perf/x86: Export Sandy Bridge uncore clockticks event in sysfs

This patch exports the clockticks event and its encoding to user level.
The clockticks event was exported for Nehalem/Westmere but not for Sandy
Bridge (client). Given that it uses a special encoding, it needs to be
exported to user tools, so users can do:

  # perf stat -a -C 0 -e uncore_cbox_0/clockticks/ sleep 1

Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120829130122.GA32336@quad
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
index 0a5571080e74..38e4894165b9 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
@@ -661,6 +661,11 @@ static void snb_uncore_msr_init_box(struct intel_uncore_box *box)
         }
 }
 
+static struct uncore_event_desc snb_uncore_events[] = {
+        INTEL_UNCORE_EVENT_DESC(clockticks, "event=0xff,umask=0x00"),
+        { /* end: all zeroes */ },
+};
+
 static struct attribute *snb_uncore_formats_attr[] = {
         &format_attr_event.attr,
         &format_attr_umask.attr,
@@ -704,6 +709,7 @@ static struct intel_uncore_type snb_uncore_cbox = {
         .constraints    = snb_uncore_cbox_constraints,
         .ops            = &snb_uncore_msr_ops,
         .format_group   = &snb_uncore_format_group,
+        .event_descs    = snb_uncore_events,
 };
 
 static struct intel_uncore_type *snb_msr_uncores[] = {