Re: [PATCH 10/10] drm/msm: add atomic traces

From: Sean Paul
Date: Tue Sep 03 2019 - 16:55:00 EST

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On Thu, Aug 29, 2019 at 09:45:18AM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@xxxxxxxxxxxx>
>
> This was useful for debugging fps drops. I suspect it will be useful
> again.
>
> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>

I'm a simple man, I see tracepoints patches and R-b tracepoints patches :)

Reviewed-by: Sean Paul <sean@xxxxxxxxxx>

> ---
> 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
>

--
Sean Paul, Software Engineer, Google / Chromium OS

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