RE: [Intel-gfx] [PATCH 2/3] dma-fence: use default wait function for mock fences

[Ruhl, Michael J]

>-----Original Message-----
>From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of
>Daniel Vetter
>Sent: Monday, May 11, 2020 5:12 AM
>To: LKML <linux-kernel@xxxxxxxxxxxxxxx>
>Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>; Intel Graphics Development
><intel-gfx@xxxxxxxxxxxxxxxxxxxxx>; DRI Development <dri-
>devel@xxxxxxxxxxxxxxxxxxxxx>; linaro-mm-sig@xxxxxxxxxxxxxxxx; Vetter, Daniel
><daniel.vetter@xxxxxxxxx>; Sumit Semwal <sumit.semwal@xxxxxxxxxx>; linux-
>media@xxxxxxxxxxxxxxx
>Subject: [Intel-gfx] [PATCH 2/3] dma-fence: use default wait function for
>mock fences
>
>No need to micro-optmize when we're waiting in a mocked object ...

Makes sense to me.

Acked-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>

M

>Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
>Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
>Cc: linux-media@xxxxxxxxxxxxxxx
>Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
>---
> drivers/dma-buf/st-dma-fence.c | 41 ----------------------------------
> 1 file changed, 41 deletions(-)
>
>diff --git a/drivers/dma-buf/st-dma-fence.c b/drivers/dma-buf/st-dma-
>fence.c
>index e593064341c8..8166d2984702 100644
>--- a/drivers/dma-buf/st-dma-fence.c
>+++ b/drivers/dma-buf/st-dma-fence.c
>@@ -33,50 +33,9 @@ static void mock_fence_release(struct dma_fence *f)
> 	kmem_cache_free(slab_fences, to_mock_fence(f));
> }
>
>-struct wait_cb {
>-	struct dma_fence_cb cb;
>-	struct task_struct *task;
>-};
>-
>-static void mock_wakeup(struct dma_fence *f, struct dma_fence_cb *cb)
>-{
>-	wake_up_process(container_of(cb, struct wait_cb, cb)->task);
>-}
>-
>-static long mock_wait(struct dma_fence *f, bool intr, long timeout)
>-{
>-	const int state = intr ? TASK_INTERRUPTIBLE :
>TASK_UNINTERRUPTIBLE;
>-	struct wait_cb cb = { .task = current };
>-
>-	if (dma_fence_add_callback(f, &cb.cb, mock_wakeup))
>-		return timeout;
>-
>-	while (timeout) {
>-		set_current_state(state);
>-
>-		if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags))
>-			break;
>-
>-		if (signal_pending_state(state, current))
>-			break;
>-
>-		timeout = schedule_timeout(timeout);
>-	}
>-	__set_current_state(TASK_RUNNING);
>-
>-	if (!dma_fence_remove_callback(f, &cb.cb))
>-		return timeout;
>-
>-	if (signal_pending_state(state, current))
>-		return -ERESTARTSYS;
>-
>-	return -ETIME;
>-}
>-
> static const struct dma_fence_ops mock_ops = {
> 	.get_driver_name = mock_name,
> 	.get_timeline_name = mock_name,
>-	.wait = mock_wait,
> 	.release = mock_fence_release,
> };
>
>--
>2.26.2
>
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