linux-kernel - [PATCH 0/2] Add a few tracepoints to panthor

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Message-Id: <20251203-panthor-tracepoints-v1-0-871c8917e084@collabora.com>
Date: Wed, 03 Dec 2025 14:56:21 +0100
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>, 
 Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: kernel@...labora.com, linux-kernel@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH 0/2] Add a few tracepoints to panthor

This series adds two tracepoints to panthor.

The first tracepoint allows for inspecting utilisation of the hardware
subdivisions, e.g. how many shader cores are active. This is done by
reading three hardware registers when a certain IRQ fires.

The second tracepoint instruments panthor's job IRQ handler. This is
more useful than the generic interrupt tracing functionality, as the
tracepoint has the events bit mask included, which indicates which
command stream group interfaces triggered the interrupt.

To test the tracepoints, the following can be used:

  :~# echo 1 > /sys/kernel/tracing/events/panthor/gpu_power_active/enable
  :~# echo 1 > /sys/kernel/tracing/events/panthor/gpu_job_irq/enable
  :~# echo 1 > /sys/kernel/tracing/tracing_on
  :~# cat /sys/kernel/tracing/trace_pipe

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
Nicolas Frattaroli (2):
      drm/panthor: Add tracepoint for hardware utilisation changes
      drm/panthor: Add gpu_job_irq tracepoint

 drivers/gpu/drm/panthor/panthor_device.c |  1 +
 drivers/gpu/drm/panthor/panthor_fw.c     | 13 +++++++
 drivers/gpu/drm/panthor/panthor_gpu.c    |  9 +++++
 drivers/gpu/drm/panthor/panthor_trace.h  | 62 ++++++++++++++++++++++++++++++++
 4 files changed, 85 insertions(+)
---
base-commit: 6ef847703ac6da2deaaf735ce95369ba25c2c432
change-id: 20251203-panthor-tracepoints-488af09d46e7

Best regards,
-- 
Nicolas Frattaroli <nicolas.frattaroli@...labora.com>