drm: add vblank event trace point

Emit a trace point for vblank events.  This can be helpful for mapping
drawing activity against the vblank frequency and period.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index abe3f446ca48efe06d7896d00b4c347a2e6daead..3b02e04ec2c4ed7bdd0b1b7419ad86c45dae906c 100644 (file)
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -11,7 +11,8 @@ drm-y       :=        drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
                drm_agpsupport.o drm_scatter.o ati_pcigart.o drm_pci.o \
                drm_sysfs.o drm_hashtab.o drm_sman.o drm_mm.o \
                drm_crtc.o drm_modes.o drm_edid.o \
-               drm_info.o drm_debugfs.o drm_encoder_slave.o
+               drm_info.o drm_debugfs.o drm_encoder_slave.o \
+               drm_trace_points.o
 
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 
@@ -19,6 +20,8 @@ drm_kms_helper-y := drm_fb_helper.o drm_crtc_helper.o drm_dp_i2c_helper.o
 
 obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
 
+CFLAGS_drm_trace_points.o := -I$(src)
+
 obj-$(CONFIG_DRM)      += drm.o
 obj-$(CONFIG_DRM_TTM)  += ttm/
 obj-$(CONFIG_DRM_TDFX) += tdfx/

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index a263b7070fc6f81b227d77a3befbd11b6efc8be0..6d201a89441c8c79d8c187c1f85102604dd0f1aa 100644 (file)
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -34,6 +34,7 @@
  */
 
 #include "drmP.h"
+#include "drm_trace.h"
 
 #include <linux/interrupt.h>   /* For task queue support */
 #include <linux/slab.h>
@@ -754,6 +755,8 @@ void drm_handle_vblank_events(struct drm_device *dev, int crtc)
        }
 
        spin_unlock_irqrestore(&dev->event_lock, flags);
+
+       trace_drm_vblank_event(crtc, seq);
 }
 
 /**

diff --git a/drivers/gpu/drm/drm_trace.h b/drivers/gpu/drm/drm_trace.h
new file mode 100644 (file)
index 0000000..8a92683
--- /dev/null
+++ b/drivers/gpu/drm/drm_trace.h
@@ -0,0 +1,37 @@
+#if !defined(_DRM_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _DRM_TRACE_H_
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM drm
+#define TRACE_SYSTEM_STRING __stringify(TRACE_SYSTEM)
+#define TRACE_INCLUDE_FILE drm_trace
+
+TRACE_EVENT(drm_vblank_event,
+
+       TP_PROTO(int crtc, unsigned int seq),
+
+       TP_ARGS(crtc, seq),
+
+       TP_STRUCT__entry(
+               __field(int, crtc)
+               __field(unsigned int, seq)
+               ),
+
+       TP_fast_assign(
+               __entry->crtc = crtc;
+               __entry->seq = seq;
+               ),
+
+       TP_printk("crtc=%d, seq=%d", __entry->crtc, __entry->seq)
+);
+
+#endif /* _DRM_TRACE_H_ */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#include <trace/define_trace.h>

diff --git a/drivers/gpu/drm/drm_trace_points.c b/drivers/gpu/drm/drm_trace_points.c
new file mode 100644 (file)
index 0000000..0d0eb90
--- /dev/null
+++ b/drivers/gpu/drm/drm_trace_points.c
@@ -0,0 +1,4 @@
+#include "drmP.h"
+
+#define CREATE_TRACE_POINTS
+#include "drm_trace.h"