[Intel-gfx] [PATCH 17/18] drm/i915: Add cxsr toggle tracepoint

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Add a tracepoint for observing changes in the cxsr state. The tracepoint
will dump out the frame and scanline counters for each pipe so that the
information can be compared with eg. plane update tracepoints.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_trace.h | 30 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_pm.c   |  2 ++
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index ca8198785311..2537a03555cc 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -16,6 +16,36 @@
 
 /* watermark/fifo updates */
 
+TRACE_EVENT(intel_memory_cxsr,
+	    TP_PROTO(struct drm_i915_private *dev_priv, bool old, bool new),
+	    TP_ARGS(dev_priv, old, new),
+
+	    TP_STRUCT__entry(
+			     __array(u32, frame, 3)
+			     __array(u32, scanline, 3)
+			     __field(bool, old)
+			     __field(bool, new)
+			     ),
+
+	    TP_fast_assign(
+			   enum pipe pipe;
+			   for_each_pipe(dev_priv, pipe) {
+				   __entry->frame[pipe] =
+					   dev_priv->drm.driver->get_vblank_counter(&dev_priv->drm, pipe);
+				   __entry->scanline[pipe] =
+					   intel_get_crtc_scanline(intel_get_crtc_for_pipe(dev_priv, pipe));
+			   }
+			   __entry->old = old;
+			   __entry->new = new;
+			   ),
+
+	    TP_printk("%s->%s, pipe A: frame=%u, scanline=%u, pipe B: frame=%u, scanline=%u, pipe C: frame=%u, scanline=%u",
+		      onoff(__entry->old), onoff(__entry->new),
+		      __entry->frame[PIPE_A], __entry->scanline[PIPE_A],
+		      __entry->frame[PIPE_B], __entry->scanline[PIPE_B],
+		      __entry->frame[PIPE_C], __entry->scanline[PIPE_C])
+);
+
 TRACE_EVENT(vlv_wm,
 	    TP_PROTO(struct intel_crtc *crtc, const struct vlv_wm_values *wm),
 	    TP_ARGS(crtc, wm),
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b6ac7f1574b7..0b8956acae4c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -377,6 +377,8 @@ static bool _intel_set_memory_cxsr(struct drm_i915_private *dev_priv, bool enabl
 		return false;
 	}
 
+	trace_intel_memory_cxsr(dev_priv, was_enabled, enable);
+
 	DRM_DEBUG_KMS("memory self-refresh is %s (was %s)\n",
 		      enableddisabled(enable),
 		      enableddisabled(was_enabled));
-- 
2.10.2