From 1dadba87cba20989c5a5a56f2a86fe6672e37c30 Mon Sep 17 00:00:00 2001 From: Maarten Lankhorst <maarten.lankhorst@canonical.com> Date: Mon, 22 Sep 2014 11:08:48 +0200 Subject: [PATCH] drm/nouveau: nv84+: fix fence context seqno's This fixes a regression introduced by "drm/nouveau: rework to new fence interface" (commit 29ba89b2371d466). The fence sequence should not be reset after creation, the old value is used instead. On destruction the final value is written, to prevent another source of accidental wraparound in case of a channel being destroyed after a hang, and unblocking any other channel that may wait on the about-to-be-deleted channel to signal. I'm nothing if not optimistic about any hope of recovery from that. ;-) Reported-by: Ted Percival <ted@tedp.id.au> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Tested-by: Ted Percival <ted@tedp.id.au> Acked-by: Ben Skeggs <bskeggs@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com> --- drivers/gpu/drm/nouveau/nv84_fence.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nv84_fence.c b/drivers/gpu/drm/nouveau/nv84_fence.c index a2f28082c272b..1e5017f905dbe 100644 --- a/drivers/gpu/drm/nouveau/nv84_fence.c +++ b/drivers/gpu/drm/nouveau/nv84_fence.c @@ -120,6 +120,7 @@ nv84_fence_context_del(struct nouveau_channel *chan) nouveau_bo_vma_del(bo, &fctx->dispc_vma[i]); } + nouveau_bo_wr32(priv->bo, chan->chid * 16 / 4, fctx->base.sequence); nouveau_bo_vma_del(priv->bo, &fctx->vma_gart); nouveau_bo_vma_del(priv->bo, &fctx->vma); nouveau_fence_context_del(&fctx->base); @@ -159,8 +160,6 @@ nv84_fence_context_new(struct nouveau_channel *chan) ret = nouveau_bo_vma_add(bo, cli->vm, &fctx->dispc_vma[i]); } - nouveau_bo_wr32(priv->bo, chan->chid * 16/4, 0x00000000); - if (ret) nv84_fence_context_del(chan); return ret; -- GitLab