drm/v3d: Add more tracepoints for V3D GPU rendering.

The core scheduler tells us when the job is pushed to the scheduler's
queue, and I had the job_run functions saying when they actually queue
the job to the hardware.  By adding tracepoints for the very top of
the ioctls and the IRQs signaling job completion, "perf record -a -e
v3d:.\* -e gpu_scheduler:.\* <job>; perf script" gets you a pretty
decent timeline.
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181201005759.28093-5-eric@anholt.netReviewed-by: Dave Emett <david.emett@broadcom.com>

drivers/gpu/drm/v3d/v3d_gem.c

@@ -521,6 +521,8 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 	struct drm_syncobj *sync_out;
 	int ret = 0;
 
+	trace_v3d_submit_cl_ioctl(&v3d->drm, args->rcl_start, args->rcl_end);
+
 	if (args->pad != 0) {
 		DRM_INFO("pad must be zero: %d\n", args->pad);
 		return -EINVAL;
@@ -648,6 +650,8 @@ v3d_submit_tfu_ioctl(struct drm_device *dev, void *data,
 	int ret = 0;
 	int bo_count;
 
+	trace_v3d_submit_tfu_ioctl(&v3d->drm, args->iia);
+
 	job = kcalloc(1, sizeof(*job), GFP_KERNEL);
 	if (!job)
 		return -ENOMEM;

drivers/gpu/drm/v3d/v3d_irq.c

@@ -15,6 +15,7 @@
 
 #include "v3d_drv.h"
 #include "v3d_regs.h"
+#include "v3d_trace.h"
 
 #define V3D_CORE_IRQS ((u32)(V3D_INT_OUTOMEM |	\
 			     V3D_INT_FLDONE |	\
@@ -88,12 +89,20 @@ v3d_irq(int irq, void *arg)
 	}
 
 	if (intsts & V3D_INT_FLDONE) {
-		dma_fence_signal(v3d->bin_job->bin.done_fence);
+		struct v3d_fence *fence =
+			to_v3d_fence(v3d->bin_job->bin.done_fence);
+
+		trace_v3d_bcl_irq(&v3d->drm, fence->seqno);
+		dma_fence_signal(&fence->base);
 		status = IRQ_HANDLED;
 	}
 
 	if (intsts & V3D_INT_FRDONE) {
-		dma_fence_signal(v3d->render_job->render.done_fence);
+		struct v3d_fence *fence =
+			to_v3d_fence(v3d->render_job->render.done_fence);
+
+		trace_v3d_rcl_irq(&v3d->drm, fence->seqno);
+		dma_fence_signal(&fence->base);
 		status = IRQ_HANDLED;
 	}
 
@@ -119,7 +128,11 @@ v3d_hub_irq(int irq, void *arg)
 	V3D_WRITE(V3D_HUB_INT_CLR, intsts);
 
 	if (intsts & V3D_HUB_INT_TFUC) {
-		dma_fence_signal(v3d->tfu_job->done_fence);
+		struct v3d_fence *fence =
+			to_v3d_fence(v3d->tfu_job->done_fence);
+
+		trace_v3d_tfu_irq(&v3d->drm, fence->seqno);
+		dma_fence_signal(&fence->base);
 		status = IRQ_HANDLED;
 	}
 

drivers/gpu/drm/v3d/v3d_trace.h

@@ -12,6 +12,28 @@
 #define TRACE_SYSTEM v3d
 #define TRACE_INCLUDE_FILE v3d_trace
 
+TRACE_EVENT(v3d_submit_cl_ioctl,
+	    TP_PROTO(struct drm_device *dev, u32 ct1qba, u32 ct1qea),
+	    TP_ARGS(dev, ct1qba, ct1qea),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u32, ct1qba)
+			     __field(u32, ct1qea)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->ct1qba = ct1qba;
+			   __entry->ct1qea = ct1qea;
+			   ),
+
+	    TP_printk("dev=%u, RCL 0x%08x..0x%08x",
+		      __entry->dev,
+		      __entry->ct1qba,
+		      __entry->ct1qea)
+);
+
 TRACE_EVENT(v3d_submit_cl,
 	    TP_PROTO(struct drm_device *dev, bool is_render,
 		     uint64_t seqno,
@@ -42,6 +64,85 @@ TRACE_EVENT(v3d_submit_cl,
 		      __entry->ctnqea)
 );
 
+TRACE_EVENT(v3d_bcl_irq,
+	    TP_PROTO(struct drm_device *dev,
+		     uint64_t seqno),
+	    TP_ARGS(dev, seqno),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u64, seqno)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->seqno = seqno;
+			   ),
+
+	    TP_printk("dev=%u, seqno=%llu",
+		      __entry->dev,
+		      __entry->seqno)
+);
+
+TRACE_EVENT(v3d_rcl_irq,
+	    TP_PROTO(struct drm_device *dev,
+		     uint64_t seqno),
+	    TP_ARGS(dev, seqno),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u64, seqno)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->seqno = seqno;
+			   ),
+
+	    TP_printk("dev=%u, seqno=%llu",
+		      __entry->dev,
+		      __entry->seqno)
+);
+
+TRACE_EVENT(v3d_tfu_irq,
+	    TP_PROTO(struct drm_device *dev,
+		     uint64_t seqno),
+	    TP_ARGS(dev, seqno),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u64, seqno)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->seqno = seqno;
+			   ),
+
+	    TP_printk("dev=%u, seqno=%llu",
+		      __entry->dev,
+		      __entry->seqno)
+);
+
+TRACE_EVENT(v3d_submit_tfu_ioctl,
+	    TP_PROTO(struct drm_device *dev, u32 iia),
+	    TP_ARGS(dev, iia),
+
+	    TP_STRUCT__entry(
+			     __field(u32, dev)
+			     __field(u32, iia)
+			     ),
+
+	    TP_fast_assign(
+			   __entry->dev = dev->primary->index;
+			   __entry->iia = iia;
+			   ),
+
+	    TP_printk("dev=%u, IIA 0x%08x",
+		      __entry->dev,
+		      __entry->iia)
+);
+
 TRACE_EVENT(v3d_submit_tfu,
 	    TP_PROTO(struct drm_device *dev,
 		     uint64_t seqno),