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drm/nvc0/fence: restore pre-suspend fence buffer context on resume

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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>
This commit is contained in:
Ben Skeggs 2012-09-28 11:50:29 +10:00
parent a0d271cbfe
commit d6ba6d215a
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/nouveau/nvc0_fence.c
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@ -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;
}