* [PATCH] drm/etnaviv: fix GPU vs sync point race
@ 2017-10-19 13:10 Lucas Stach
2017-10-19 15:19 ` Christian Gmeiner
0 siblings, 1 reply; 2+ messages in thread
From: Lucas Stach @ 2017-10-19 13:10 UTC (permalink / raw)
To: dri-devel; +Cc: etnaviv, patchwork-lst, kernel, Russell King, Chris Healy
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.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
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 93a103eb1083..8ff5d01e776d 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);
}
/*
--
2.11.0
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] drm/etnaviv: fix GPU vs sync point race
2017-10-19 13:10 [PATCH] drm/etnaviv: fix GPU vs sync point race Lucas Stach
@ 2017-10-19 15:19 ` Christian Gmeiner
0 siblings, 0 replies; 2+ messages in thread
From: Christian Gmeiner @ 2017-10-19 15:19 UTC (permalink / raw)
To: Lucas Stach
Cc: The etnaviv authors, DRI mailing list, patchwork-lst,
Sascha Hauer, Russell King, Chris Healy
2017-10-19 15:10 GMT+02:00 Lucas Stach <l.stach@pengutronix.de>:
> 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.
>
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
> ---
> 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 93a103eb1083..8ff5d01e776d 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);
> }
>
> /*
> --
> 2.11.0
>
greets
--
Christian Gmeiner, MSc
https://christian-gmeiner.info
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
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