On 9/6/24 10:11 PM, Akhil P Oommen wrote:
On Thu, Sep 05, 2024 at 04:51:25PM +0200, Antonino Maniscalco wrote:
Add trace points corresponding to preemption being triggered and being
completed for latency measurement purposes.
Signed-off-by: Antonino Maniscalco <antomani103@xxxxxxxxx>
Tested-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx> # on SM8650-QRD
---
drivers/gpu/drm/msm/adreno/a6xx_preempt.c | 7 +++++++
drivers/gpu/drm/msm/msm_gpu_trace.h | 28 ++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_preempt.c b/drivers/gpu/drm/msm/adreno/a6xx_preempt.c
index ec44f44d925f..ca9d36c107f2 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
@@ -143,6 +144,8 @@ 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.
@@ -264,6 +267,10 @@ void a6xx_preempt_trigger(struct msm_gpu *gpu)
*/
ring->skip_inline_wptr = false;
+ trace_msm_gpu_preemption_trigger(
+ a6xx_gpu->cur_ring ? a6xx_gpu->cur_ring->id : -1,
Can't we avoid this check?
Sorry yeah you had requested this change but I had forgotten to do it.
-Akhil.
+ 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
Best regards,
--
Antonino Maniscalco <antomani103@xxxxxxxxx>
