[PATCH v3 1/2] drm/panfrost: Add SYSTEM_TIMESTAMP and SYSTEM_TIMESTAMP_FREQUENCY parameters

[Heiko Stübner]

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 at collabora.com>


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

Tested-by: Heiko Stuebner <heiko at sntech.de>

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