linux-kernel - [PATCH 2/3] drm/panfrost: Add cycle counter job requirement

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Message-ID: <20240807160900.149154-3-mary.guillemard@collabora.com>
Date: Wed,  7 Aug 2024 18:08:58 +0200
From: Mary Guillemard <mary.guillemard@...labora.com>
To: linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
	kernel@...labora.com,
	Mary Guillemard <mary.guillemard@...labora.com>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	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>
Subject: [PATCH 2/3] drm/panfrost: Add cycle counter job requirement

Extend the uAPI with a new job requirement flag for cycle
counters. This requirement is used by userland to indicate that a job
requires cycle counters or system timestamp to be propagated. (for use
with write value timestamp jobs)

We cannot enable cycle counters unconditionally as this would result in
an increase of GPU power consumption. As a result, they should be left
off unless required by the application.

This new uAPI will be used in Mesa to implement timestamp queries and
VK_KHR_shader_clock.

Signed-off-by: Mary Guillemard <mary.guillemard@...labora.com>
---
 include/uapi/drm/panfrost_drm.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/drm/panfrost_drm.h b/include/uapi/drm/panfrost_drm.h
index 52b050e2b660..568724be6628 100644
--- a/include/uapi/drm/panfrost_drm.h
+++ b/include/uapi/drm/panfrost_drm.h
@@ -40,6 +40,7 @@ extern "C" {
 #define DRM_IOCTL_PANFROST_PERFCNT_DUMP		DRM_IOW(DRM_COMMAND_BASE + DRM_PANFROST_PERFCNT_DUMP, struct drm_panfrost_perfcnt_dump)
 
 #define PANFROST_JD_REQ_FS (1 << 0)
+#define PANFROST_JD_REQ_CYCLE_COUNT (1 << 1)
 /**
  * struct drm_panfrost_submit - ioctl argument for submitting commands to the 3D
  * engine.
-- 
2.45.2