linux-kernel - Re: [PATCH v3] drm/panthor: Add DEV_QUERY_TIMESTAMP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4687763.CvnuH1ECHv@diego>
Date: Tue, 20 Aug 2024 11:56:25 +0200
From: Heiko Stübner <heiko@...ech.de>
To: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: kernel@...labora.com, Christopher Healy <healych@...zon.com>,
 Mary Guillemard <mary.guillemard@...labora.com>,
 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>, Daniel Vetter <daniel@...ll.ch>,
 dri-devel@...ts.freedesktop.org,
 Mary Guillemard <mary.guillemard@...labora.com>
Subject: Re: [PATCH v3] drm/panthor: Add DEV_QUERY_TIMESTAMP_INFO dev query

Am Montag, 19. August 2024, 13:25:08 CEST schrieb Mary Guillemard:
> Expose timestamp information supported by the GPU with a new device
> query.
> 
> 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.
> 
> Since this extends the uAPI and because userland needs a way to advertise
> those features conditionally, this also bumps the driver minor version.
> 
> v2:
> - Rewrote to use GPU timestamp register
> - Added timestamp_offset to drm_panthor_timestamp_info
> - Add missing include for arch_timer_get_cntfrq
> - Rework commit message
> 
> v3:
> - Add panthor_gpu_read_64bit_counter
> - Change panthor_gpu_read_timestamp to use
>   panthor_gpu_read_64bit_counter
> 
> 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>