drm/rockchip: Add tracepoints

Enable:
  echo 1 > sys/kernel/tracing/tracing_on
  echo 1 > sys/kernel/tracing/events/rockchipdrm/enable
  echo 8192  > sys/kernel/tracing/buffer_size_kb
  cat /sys/kernel/tracing/trace

Signed-off-by: Andy Yan <[email protected]>
Change-Id: Ib3936d6093cb6dcb3a19ee5f74867be1f4befa94

Author: Andy Yan

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

@@ -47,6 +47,9 @@
 
 #include "../drm_crtc_internal.h"
 
+#define CREATE_TRACE_POINTS
+#include "rockchip_drm_trace.h"
+
 #define DRIVER_NAME	"rockchip"
 #define DRIVER_DESC	"RockChip Soc DRM"
 #define DRIVER_DATE	"20140818"
@@ -85,17 +88,23 @@ void rockchip_drm_dbg(const struct device *dev, enum rockchip_drm_debug_category
 	struct va_format vaf;
 	va_list args;
 
-	if (!rockchip_drm_debug_enabled(category))
-		return;
-
 	va_start(args, format);
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	if (dev)
-		dev_printk(KERN_DEBUG, dev, "%pV", &vaf);
+	if (rockchip_drm_debug_enabled(category)) {
+		if (dev)
+			dev_printk(KERN_DEBUG, dev, "%pV", &vaf);
+		else
+			printk(KERN_DEBUG "%pV", &vaf);
+	}
+
+	if (category == VOP_DEBUG_VSYNC)
+		trace_rockchip_drm_dbg_vsync(&vaf);
+	else if (category == VOP_DEBUG_IOMMU_MAP)
+		trace_rockchip_drm_dbg_iommu(&vaf);
 	else
-		printk(KERN_DEBUG "%pV", &vaf);
+		trace_rockchip_drm_dbg_common(&vaf);
 
 	va_end(args);
 }

drivers/gpu/drm/rockchip/rockchip_drm_drv.h

@@ -75,6 +75,7 @@ enum rockchip_drm_debug_category {
 	VOP_DEBUG_WB		= BIT(2),
 	VOP_DEBUG_CFG_DONE	= BIT(3),
 	VOP_DEBUG_CLK		= BIT(4),
+	VOP_DEBUG_IOMMU_MAP     = BIT(5),
 	VOP_DEBUG_VSYNC		= BIT(7),
 	VOP_DEBUG_PIXEL_SHIFT	= BIT(8),
 };

drivers/gpu/drm/rockchip/rockchip_drm_trace.h

@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
+ *
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rockchipdrm
+
+#if !defined(_ROCKCHIP_DRM_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _ROCKCHIP_DRM_TRACE_H_
+
+#include <linux/tracepoint.h>
+
+#define ROCKCHIP_DRM_MAX_MSG_LEN	256
+
+DECLARE_EVENT_CLASS(rockchipdrm_dbg,
+
+	    TP_PROTO(struct va_format *vaf),
+
+	    TP_ARGS(vaf),
+
+	    TP_STRUCT__entry(
+		    __dynamic_array(char, msg, ROCKCHIP_DRM_MAX_MSG_LEN)
+	    ),
+
+	    TP_fast_assign(
+		    WARN_ON_ONCE(vsnprintf(__get_dynamic_array(msg),
+					   ROCKCHIP_DRM_MAX_MSG_LEN,
+					   vaf->fmt,
+					   *vaf->va) >= ROCKCHIP_DRM_MAX_MSG_LEN);
+	    ),
+
+	    TP_printk("%s", __get_str(msg))
+);
+
+DEFINE_EVENT(rockchipdrm_dbg, rockchip_drm_dbg_common,
+	     TP_PROTO(struct va_format *vaf),
+	     TP_ARGS(vaf)
+);
+
+DEFINE_EVENT(rockchipdrm_dbg, rockchip_drm_dbg_iommu,
+	     TP_PROTO(struct va_format *vaf),
+	     TP_ARGS(vaf)
+);
+
+DEFINE_EVENT(rockchipdrm_dbg, rockchip_drm_dbg_vsync,
+	     TP_PROTO(struct va_format *vaf),
+	     TP_ARGS(vaf)
+);
+
+#endif /* _ROCKCHIP_DRM_TRACE_H_ || TRACE_HEADER_MULTI_READ */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../drivers/gpu/drm/rockchip
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE rockchip_drm_trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>