linux-kernel - [PATCH v4 08/11] drm/msm/A6xx: Add traces for preemption

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Message-Id: <20240917-preemption-a750-t-v4-8-95d48012e0ac@gmail.com>
Date: Tue, 17 Sep 2024 13:14:18 +0200
From: Antonino Maniscalco <antomani103@...il.com>
To: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Jonathan Corbet <corbet@....net>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, Antonino Maniscalco <antomani103@...il.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v4 08/11] drm/msm/A6xx: Add traces for preemption

Add trace points corresponding to preemption being triggered and being
completed for latency measurement purposes.

Signed-off-by: Antonino Maniscalco <antomani103@...il.com>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8650-QRD
---
 drivers/gpu/drm/msm/adreno/a6xx_preempt.c |  6 ++++++
 drivers/gpu/drm/msm/msm_gpu_trace.h       | 28 ++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_preempt.c b/drivers/gpu/drm/msm/adreno/a6xx_preempt.c
index 77c4d5e91854..4fbc66d6860a 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_preempt.c
@@ -7,6 +7,7 @@
 #include "a6xx_gpu.h"
 #include "a6xx_gmu.xml.h"
 #include "msm_mmu.h"
+#include "msm_gpu_trace.h"
 
 /*
  * Try to transition the preemption state from old to new. Return
@@ -174,6 +175,8 @@ void a6xx_preempt_irq(struct msm_gpu *gpu)
 
 	set_preempt_state(a6xx_gpu, PREEMPT_NONE);
 
+	trace_msm_gpu_preemption_irq(a6xx_gpu->cur_ring->id);
+
 	/*
 	 * Retrigger preemption to avoid a deadlock that might occur when preemption
 	 * is skipped due to it being already in flight when requested.
@@ -295,6 +298,9 @@ void a6xx_preempt_trigger(struct msm_gpu *gpu)
 	 */
 	ring->restore_wptr = false;
 
+	trace_msm_gpu_preemption_trigger(a6xx_gpu->cur_ring->id,
+		ring ? ring->id : -1);
+
 	spin_unlock_irqrestore(&ring->preempt_lock, flags);
 
 	gpu_write64(gpu,
diff --git a/drivers/gpu/drm/msm/msm_gpu_trace.h b/drivers/gpu/drm/msm/msm_gpu_trace.h
index ac40d857bc45..7f863282db0d 100644
--- a/drivers/gpu/drm/msm/msm_gpu_trace.h
+++ b/drivers/gpu/drm/msm/msm_gpu_trace.h
@@ -177,6 +177,34 @@ TRACE_EVENT(msm_gpu_resume,
 		TP_printk("%u", __entry->dummy)
 );
 
+TRACE_EVENT(msm_gpu_preemption_trigger,
+		TP_PROTO(int ring_id_from, int ring_id_to),
+		TP_ARGS(ring_id_from, ring_id_to),
+		TP_STRUCT__entry(
+			__field(int, ring_id_from)
+			__field(int, ring_id_to)
+			),
+		TP_fast_assign(
+			__entry->ring_id_from = ring_id_from;
+			__entry->ring_id_to = ring_id_to;
+			),
+		TP_printk("preempting %u -> %u",
+			  __entry->ring_id_from,
+			  __entry->ring_id_to)
+);
+
+TRACE_EVENT(msm_gpu_preemption_irq,
+		TP_PROTO(u32 ring_id),
+		TP_ARGS(ring_id),
+		TP_STRUCT__entry(
+			__field(u32, ring_id)
+			),
+		TP_fast_assign(
+			__entry->ring_id = ring_id;
+			),
+		TP_printk("preempted to %u", __entry->ring_id)
+);
+
 #endif
 
 #undef TRACE_INCLUDE_PATH

-- 
2.46.0