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Subject[PATCH 10/10] drm/msm: add atomic traces
Date
From: Rob Clark <robdclark@chromium.org>

This was useful for debugging fps drops. I suspect it will be useful
again.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/msm/Makefile | 1 +
drivers/gpu/drm/msm/msm_atomic.c | 24 +++-
drivers/gpu/drm/msm/msm_atomic_trace.h | 110 +++++++++++++++++++
drivers/gpu/drm/msm/msm_atomic_tracepoints.c | 3 +
drivers/gpu/drm/msm/msm_gpu_trace.h | 2 +-
5 files changed, 136 insertions(+), 4 deletions(-)
create mode 100644 drivers/gpu/drm/msm/msm_atomic_trace.h
create mode 100644 drivers/gpu/drm/msm/msm_atomic_tracepoints.c

diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index 7a05cbf2f820..1579cf0d828f 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -75,6 +75,7 @@ msm-y := \
disp/dpu1/dpu_rm.o \
disp/dpu1/dpu_vbif.o \
msm_atomic.o \
+ msm_atomic_tracepoints.o \
msm_debugfs.o \
msm_drv.o \
msm_fb.o \
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 80536538967b..fb247aa1081e 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -6,6 +6,7 @@

#include <drm/drm_atomic_uapi.h>

+#include "msm_atomic_trace.h"
#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_kms.h"
@@ -33,11 +34,13 @@ static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
{
unsigned crtc_mask = BIT(crtc_idx);

+ trace_msm_atomic_async_commit_start(crtc_mask);
+
mutex_lock(&kms->commit_lock);

if (!(kms->pending_crtc_mask & crtc_mask)) {
mutex_unlock(&kms->commit_lock);
- return;
+ goto out;
}

kms->pending_crtc_mask &= ~crtc_mask;
@@ -47,19 +50,24 @@ static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
/*
* Flush hardware updates:
*/
- DRM_DEBUG_ATOMIC("triggering async commit\n");
+ trace_msm_atomic_flush_commit(crtc_mask);
kms->funcs->flush_commit(kms, crtc_mask);
mutex_unlock(&kms->commit_lock);

/*
* Wait for flush to complete:
*/
+ trace_msm_atomic_wait_flush_start(crtc_mask);
kms->funcs->wait_flush(kms, crtc_mask);
+ trace_msm_atomic_wait_flush_finish(crtc_mask);

mutex_lock(&kms->commit_lock);
kms->funcs->complete_commit(kms, crtc_mask);
mutex_unlock(&kms->commit_lock);
kms->funcs->disable_commit(kms);
+
+out:
+ trace_msm_atomic_async_commit_finish(crtc_mask);
}

static enum hrtimer_restart msm_atomic_pending_timer(struct hrtimer *t)
@@ -144,13 +152,17 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
bool async = kms->funcs->vsync_time &&
can_do_async(state, &async_crtc);

+ trace_msm_atomic_commit_tail_start(async, crtc_mask);
+
kms->funcs->enable_commit(kms);

/*
* Ensure any previous (potentially async) commit has
* completed:
*/
+ trace_msm_atomic_wait_flush_start(crtc_mask);
kms->funcs->wait_flush(kms, crtc_mask);
+ trace_msm_atomic_wait_flush_finish(crtc_mask);

mutex_lock(&kms->commit_lock);

@@ -201,6 +213,8 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
drm_atomic_helper_commit_hw_done(state);
drm_atomic_helper_cleanup_planes(dev, state);

+ trace_msm_atomic_commit_tail_finish(async, crtc_mask);
+
return;
}

@@ -213,14 +227,16 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
/*
* Flush hardware updates:
*/
- DRM_DEBUG_ATOMIC("triggering commit\n");
+ trace_msm_atomic_flush_commit(crtc_mask);
kms->funcs->flush_commit(kms, crtc_mask);
mutex_unlock(&kms->commit_lock);

/*
* Wait for flush to complete:
*/
+ trace_msm_atomic_wait_flush_start(crtc_mask);
kms->funcs->wait_flush(kms, crtc_mask);
+ trace_msm_atomic_wait_flush_finish(crtc_mask);

mutex_lock(&kms->commit_lock);
kms->funcs->complete_commit(kms, crtc_mask);
@@ -229,4 +245,6 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)

drm_atomic_helper_commit_hw_done(state);
drm_atomic_helper_cleanup_planes(dev, state);
+
+ trace_msm_atomic_commit_tail_finish(async, crtc_mask);
}
diff --git a/drivers/gpu/drm/msm/msm_atomic_trace.h b/drivers/gpu/drm/msm/msm_atomic_trace.h
new file mode 100644
index 000000000000..b4ca0ed3b4a3
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_atomic_trace.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#if !defined(_MSM_GPU_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _MSM_GPU_TRACE_H_
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM drm_msm_atomic
+#define TRACE_INCLUDE_FILE msm_atomic_trace
+
+TRACE_EVENT(msm_atomic_commit_tail_start,
+ TP_PROTO(bool async, unsigned crtc_mask),
+ TP_ARGS(async, crtc_mask),
+ TP_STRUCT__entry(
+ __field(bool, async)
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->async = async;
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("async=%d crtc_mask=%x",
+ __entry->async, __entry->crtc_mask)
+);
+
+TRACE_EVENT(msm_atomic_commit_tail_finish,
+ TP_PROTO(bool async, unsigned crtc_mask),
+ TP_ARGS(async, crtc_mask),
+ TP_STRUCT__entry(
+ __field(bool, async)
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->async = async;
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("async=%d crtc_mask=%x",
+ __entry->async, __entry->crtc_mask)
+);
+
+TRACE_EVENT(msm_atomic_async_commit_start,
+ TP_PROTO(unsigned crtc_mask),
+ TP_ARGS(crtc_mask),
+ TP_STRUCT__entry(
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("crtc_mask=%x",
+ __entry->crtc_mask)
+);
+
+TRACE_EVENT(msm_atomic_async_commit_finish,
+ TP_PROTO(unsigned crtc_mask),
+ TP_ARGS(crtc_mask),
+ TP_STRUCT__entry(
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("crtc_mask=%x",
+ __entry->crtc_mask)
+);
+
+TRACE_EVENT(msm_atomic_wait_flush_start,
+ TP_PROTO(unsigned crtc_mask),
+ TP_ARGS(crtc_mask),
+ TP_STRUCT__entry(
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("crtc_mask=%x",
+ __entry->crtc_mask)
+);
+
+TRACE_EVENT(msm_atomic_wait_flush_finish,
+ TP_PROTO(unsigned crtc_mask),
+ TP_ARGS(crtc_mask),
+ TP_STRUCT__entry(
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("crtc_mask=%x",
+ __entry->crtc_mask)
+);
+
+TRACE_EVENT(msm_atomic_flush_commit,
+ TP_PROTO(unsigned crtc_mask),
+ TP_ARGS(crtc_mask),
+ TP_STRUCT__entry(
+ __field(u32, crtc_mask)
+ ),
+ TP_fast_assign(
+ __entry->crtc_mask = crtc_mask;
+ ),
+ TP_printk("crtc_mask=%x",
+ __entry->crtc_mask)
+);
+
+#endif
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../drivers/gpu/drm/msm
+#include <trace/define_trace.h>
diff --git a/drivers/gpu/drm/msm/msm_atomic_tracepoints.c b/drivers/gpu/drm/msm/msm_atomic_tracepoints.c
new file mode 100644
index 000000000000..011dc881f391
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_atomic_tracepoints.c
@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: GPL-2.0
+#define CREATE_TRACE_POINTS
+#include "msm_atomic_trace.h"
diff --git a/drivers/gpu/drm/msm/msm_gpu_trace.h b/drivers/gpu/drm/msm/msm_gpu_trace.h
index 1155118a27a1..122b84789238 100644
--- a/drivers/gpu/drm/msm/msm_gpu_trace.h
+++ b/drivers/gpu/drm/msm/msm_gpu_trace.h
@@ -5,7 +5,7 @@
#include <linux/tracepoint.h>

#undef TRACE_SYSTEM
-#define TRACE_SYSTEM drm_msm
+#define TRACE_SYSTEM drm_msm_gpu
#define TRACE_INCLUDE_FILE msm_gpu_trace

TRACE_EVENT(msm_gpu_submit,
--
2.21.0
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