linux-kernel - [PATCH 5.4 04/71] drm/nouveau: wait for moving fence after pinning v2

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Date:   Mon, 28 Jun 2021 10:28:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>, stable@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 5.4 04/71] drm/nouveau: wait for moving fence after pinning v2

From: Christian König <christian.koenig@....com>

commit 17b11f71795abdce46f62a808f906857e525cea8 upstream.

We actually need to wait for the moving fence after pinning
the BO to make sure that the pin is completed.

v2: grab the lock while waiting

Signed-off-by: Christian König <christian.koenig@....com>
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
References: https://lore.kernel.org/dri-devel/20210621151758.2347474-1-daniel.vetter@ffwll.ch/
CC: stable@...nel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20210622114506.106349-1-christian.koenig@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/nouveau/nouveau_prime.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index bae6a3eccee0..f9ee562f72d3 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -112,7 +112,22 @@ int nouveau_gem_prime_pin(struct drm_gem_object *obj)
 	if (ret)
 		return -EINVAL;
 
-	return 0;
+	ret = ttm_bo_reserve(&nvbo->bo, false, false, NULL);
+	if (ret)
+		goto error;
+
+	if (nvbo->bo.moving)
+		ret = dma_fence_wait(nvbo->bo.moving, true);
+
+	ttm_bo_unreserve(&nvbo->bo);
+	if (ret)
+		goto error;
+
+	return ret;
+
+error:
+	nouveau_bo_unpin(nvbo);
+	return ret;
 }
 
 void nouveau_gem_prime_unpin(struct drm_gem_object *obj)
-- 
2.30.2