intel_pstate: Add trace point to report internal state.

Add perf trace event "power:pstate_sample" to report driver state to
aid in diagnosing issues reported against intel_pstate.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index cda100d6762d..9e9475c85de5 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -35,6 +35,59 @@ DEFINE_EVENT(cpu, cpu_idle,
         TP_ARGS(state, cpu_id)
 );
 
+TRACE_EVENT(pstate_sample,
+
+        TP_PROTO(u32 core_busy,
+                u32 scaled_busy,
+                u32 state,
+                u64 mperf,
+                u64 aperf,
+                u32 energy,
+                u32 freq
+                ),
+
+        TP_ARGS(core_busy,
+                scaled_busy,
+                state,
+                mperf,
+                aperf,
+                energy,
+                freq
+                ),
+
+        TP_STRUCT__entry(
+                __field(u32, core_busy)
+                __field(u32, scaled_busy)
+                __field(u32, state)
+                __field(u64, mperf)
+                __field(u64, aperf)
+                __field(u32, energy)
+                __field(u32, freq)
+
+        ),
+
+        TP_fast_assign(
+                __entry->core_busy = core_busy;
+                __entry->scaled_busy = scaled_busy;
+                __entry->state = state;
+                __entry->mperf = mperf;
+                __entry->aperf = aperf;
+                __entry->energy = energy;
+                __entry->freq = freq;
+                ),
+
+        TP_printk("core_busy=%lu scaled=%lu state=%lu mperf=%llu aperf=%llu energy=%lu freq=%lu ",
+                (unsigned long)__entry->core_busy,
+                (unsigned long)__entry->scaled_busy,
+                (unsigned long)__entry->state,
+                (unsigned long long)__entry->mperf,
+                (unsigned long long)__entry->aperf,
+                (unsigned long)__entry->energy,
+                (unsigned long)__entry->freq
+                )
+
+);
+
 /* This file can get included multiple times, TRACE_HEADER_MULTI_READ at top */
 #ifndef _PWR_EVENT_AVOID_DOUBLE_DEFINING
 #define _PWR_EVENT_AVOID_DOUBLE_DEFINING