linux-kernel - Re: [PATCH v3 1/2] drm/panfrost: Add SYSTEM_TIMESTAMP and SYSTEM_TIMESTAMP

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Message-ID: <7068759.18pcnM708K@diego>
Date: Tue, 20 Aug 2024 12:01:42 +0200
From: Heiko Stübner <heiko@...ech.de>
To: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.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>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Mary Guillemard <mary.guillemard@...labora.com>
Subject:
 Re: [PATCH v3 1/2] drm/panfrost: Add SYSTEM_TIMESTAMP and
 SYSTEM_TIMESTAMP_FREQUENCY parameters

Am Montag, 19. August 2024, 10:02:22 CEST schrieb Mary Guillemard:
> Expose system timestamp and frequency supported by the GPU.
> 
> Mali uses an external timer as GPU system time. On ARM, this is wired to
> the generic arch timer so we wire cntfrq_el0 as device frequency.
> 
> This new uAPI will be used in Mesa to implement timestamp queries and
> VK_KHR_calibrated_timestamps.
> 
> v2:
> - Rewrote to use GPU timestamp register
> - Add missing include for arch_timer_get_cntfrq
> - Rework commit message
> 
> v3:
> - Move panfrost_cycle_counter_get and panfrost_cycle_counter_put to
>   panfrost_ioctl_query_timestamp
> - Handle possible overflow in panfrost_timestamp_read
> 
> Signed-off-by: Mary Guillemard <mary.guillemard@...labora.com>


On a rk3588-tiger with matching MESA build and 
"RUSTICL_ENABLE=panfrost clpeak"

Tested-by: Heiko Stuebner <heiko@...ech.de>

Without this change, clpeak fails with
	clCreateCommandQueue (-35)