[PATCH] drm/etnaviv: reduce number of ktime_get calls in IRQ handler

[Christian Gmeiner]

>
> A single IRQ might signal the completion of multiple jobs/fences
> at once. There is no point in attaching a new timestamp to each
> fence that only differs in when exactly the IRQ handler was able
> to process this fence.
>
> Get a single timestamp when the IRQ handler has determined that
> there are completed jobs and reuse this for all fences that get
> signalled by the handler.
>
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>

Reviewed-by: Christian Gmeiner <cgmeiner at igalia.com>

> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index 7502c55199b8..7c7f97793ddd 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1548,6 +1548,7 @@ static irqreturn_t irq_handler(int irq, void *data)
>         u32 intr = gpu_read(gpu, VIVS_HI_INTR_ACKNOWLEDGE);
>
>         if (intr != 0) {
> +               ktime_t now = ktime_get();
>                 int event;
>
>                 pm_runtime_mark_last_busy(gpu->dev);
> @@ -1597,7 +1598,7 @@ static irqreturn_t irq_handler(int irq, void *data)
>                          */
>                         if (fence_after(fence->seqno, gpu->completed_fence))
>                                 gpu->completed_fence = fence->seqno;
> -                       dma_fence_signal(fence);
> +                       dma_fence_signal_timestamp(fence, now);
>
>                         event_free(gpu, event);
>                 }
> --
> 2.39.2
>


-- 
greets
--
Christian Gmeiner, MSc

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