On Fri, 2017-12-01 at 11:35 +0100, Lucas Stach wrote:
> If the FE is restarted before the sync point event is cleared, the GPU
> might trigger a completion IRQ for the next sync point before corrupting
> the state of the currently running worker.
I don't understand this explanation. That sounds like it would be ok to
trigger a completion IRQ for the next sync point after corrupting the
state of the currently running worker. Maybe "s/before/, /"?
> Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
For the patch,
Reviewed-by: Philipp Zabel <p.za...@pengutronix.de>
regards
Philipp
> ---
> drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index e19cbe05da2a..f0fae218e4aa 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -1484,22 +1484,18 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
> return ret;
> }
>
> -static void etnaviv_process_sync_point(struct etnaviv_gpu *gpu,
> - struct etnaviv_event *event)
> -{
> - u32 addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
> -
> - event->sync_point(gpu, event);
> - etnaviv_gpu_start_fe(gpu, addr + 2, 2);
> -}
> -
> static void sync_point_worker(struct work_struct *work)
> {
> struct etnaviv_gpu *gpu = container_of(work, struct etnaviv_gpu,
> sync_point_work);
> + struct etnaviv_event *event = &gpu->event[gpu->sync_point_event];
> + u32 addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
>
> - etnaviv_process_sync_point(gpu, &gpu->event[gpu->sync_point_event]);
> + event->sync_point(gpu, event);
> event_free(gpu, gpu->sync_point_event);
> +
> + /* restart FE last to avoid GPU and IRQ racing against this worker */
> + etnaviv_gpu_start_fe(gpu, addr + 2, 2);
> }
>
> /*
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