From d6ba6d215a538a58f0f0026f0961b0b9125e8042 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Fri, 28 Sep 2012 11:50:29 +1000
Subject: [PATCH] drm/nvc0/fence: restore pre-suspend fence buffer context on
resume
Fixes some unfortunate races on resume. The G84 version of the code doesn't
need this as "gpuobj"s are automagically suspended/resumed by the core code
whereas pinned buffer objects are not.
Cc: stable@vger.kernel.org
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---
drivers/gpu/drm/nouveau/nvc0_fence.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/gpu/drm/nouveau/nvc0_fence.c b/drivers/gpu/drm/nouveau/nvc0_fence.c
index 47ab388a606e8..8e5a2f407ed4d 100644
--- a/drivers/gpu/drm/nouveau/nvc0_fence.c
+++ b/drivers/gpu/drm/nouveau/nvc0_fence.c
@@ -32,6 +32,7 @@
struct nvc0_fence_priv {
struct nouveau_fence_priv base;
struct nouveau_bo *bo;
+ u32 *suspend;
};
struct nvc0_fence_chan {
@@ -125,12 +126,36 @@ nvc0_fence_context_new(struct nouveau_channel *chan, int engine)
static int
nvc0_fence_fini(struct drm_device *dev, int engine, bool suspend)
{
+ struct nouveau_fifo_priv *pfifo = nv_engine(dev, NVOBJ_ENGINE_FIFO);
+ struct nvc0_fence_priv *priv = nv_engine(dev, engine);
+ int i;
+
+ if (suspend) {
+ priv->suspend = vmalloc(pfifo->channels * sizeof(u32));
+ if (!priv->suspend)
+ return -ENOMEM;
+
+ for (i = 0; i < pfifo->channels; i++)
+ priv->suspend[i] = nouveau_bo_rd32(priv->bo, i);
+ }
+
return 0;
}
static int
nvc0_fence_init(struct drm_device *dev, int engine)
{
+ struct nouveau_fifo_priv *pfifo = nv_engine(dev, NVOBJ_ENGINE_FIFO);
+ struct nvc0_fence_priv *priv = nv_engine(dev, engine);
+ int i;
+
+ if (priv->suspend) {
+ for (i = 0; i < pfifo->channels; i++)
+ nouveau_bo_wr32(priv->bo, i, priv->suspend[i]);
+ vfree(priv->suspend);
+ priv->suspend = NULL;
+ }
+
return 0;
}
--
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