linux-kernel - [PATCH 2/4] drm/nouveau: Simplify calls to nvif_event

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Message-ID: <20250424130254.42046-4-phasta@kernel.org>
Date: Thu, 24 Apr 2025 15:02:52 +0200
From: Philipp Stanner <phasta@...nel.org>
To: Lyude Paul <lyude@...hat.com>,
	Danilo Krummrich <dakr@...nel.org>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>
Cc: dri-devel@...ts.freedesktop.org,
	nouveau@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org,
	Philipp Stanner <phasta@...nel.org>
Subject: [PATCH 2/4] drm/nouveau: Simplify calls to nvif_event_block()

nouveau_fence_signal() returns a de-facto boolean to indicate when
nvif_event_block() shall be called.

The code can be made more compact and readable by calling
nvif_event_block() in nouveau_fence_update() directly.

Make those calls in nouveau_fence.c more canonical.

Signed-off-by: Philipp Stanner <phasta@...nel.org>
---
 drivers/gpu/drm/nouveau/nouveau_fence.c | 31 +++++++++++--------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 761c174cb286..2b79bcb7da16 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -50,10 +50,10 @@ nouveau_fctx(struct nouveau_fence *fence)
 	return container_of(fence->base.lock, struct nouveau_fence_chan, lock);
 }
 
-static int
+static bool
 nouveau_fence_signal(struct nouveau_fence *fence)
 {
-	int drop = 0;
+	bool drop = false;
 
 	dma_fence_signal_locked(&fence->base);
 	list_del(&fence->head);
@@ -63,7 +63,7 @@ nouveau_fence_signal(struct nouveau_fence *fence)
 		struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
 
 		if (!--fctx->notify_ref)
-			drop = 1;
+			drop = true;
 	}
 
 	dma_fence_put(&fence->base);
@@ -125,21 +125,23 @@ nouveau_fence_context_free(struct nouveau_fence_chan *fctx)
 	kref_put(&fctx->fence_ref, nouveau_fence_context_put);
 }
 
-static int
+static void
 nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
 {
 	struct nouveau_fence *fence, *tmp;
-	int drop = 0;
+	bool drop = false;
 	u32 seq = fctx->read(chan);
 
 	list_for_each_entry_safe(fence, tmp, &fctx->pending, head) {
 		if ((int)(seq - fence->base.seqno) < 0)
 			break;
 
-		drop |= nouveau_fence_signal(fence);
+		if (nouveau_fence_signal(fence))
+			drop = true;
 	}
 
-	return drop;
+	if (drop)
+		nvif_event_block(&fctx->event);
 }
 
 static void
@@ -150,18 +152,13 @@ nouveau_fence_uevent_work(struct work_struct *work)
 	struct nouveau_channel *chan;
 	struct nouveau_fence *fence;
 	unsigned long flags;
-	int drop = 0;
 
 	spin_lock_irqsave(&fctx->lock, flags);
 	fence = list_first_entry_or_null(&fctx->pending, typeof(*fence), head);
 	if (fence) {
 		chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
-		if (nouveau_fence_update(chan, fctx))
-			drop = 1;
+		nouveau_fence_update(chan, fctx);
 	}
-	if (drop)
-		nvif_event_block(&fctx->event);
-
 	spin_unlock_irqrestore(&fctx->lock, flags);
 }
 
@@ -241,9 +238,7 @@ nouveau_fence_emit(struct nouveau_fence *fence)
 			return -ENODEV;
 		}
 
-		if (nouveau_fence_update(chan, fctx))
-			nvif_event_block(&fctx->event);
-
+		nouveau_fence_update(chan, fctx);
 		list_add_tail(&fence->head, &fctx->pending);
 		spin_unlock_irq(&fctx->lock);
 	}
@@ -265,8 +260,8 @@ nouveau_fence_done(struct nouveau_fence *fence)
 
 		spin_lock_irqsave(&fctx->lock, flags);
 		chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
-		if (chan && nouveau_fence_update(chan, fctx))
-			nvif_event_block(&fctx->event);
+		if (chan)
+			nouveau_fence_update(chan, fctx);
 		spin_unlock_irqrestore(&fctx->lock, flags);
 	}
 	return dma_fence_is_signaled(&fence->base);
-- 
2.48.1