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drm/nv50-nvc0: prevent multiple vm/bar flushes occuring simultanenously

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The per-vm mutex doesn't prevent this completely, a flush coming from the
BAR VM could potentially happen at the same time as one for the channel
VM.  Not to mention that if/when we get per-client/channel VM, this will
happen far more frequently.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Ben Skeggs 2011-03-07 17:18:04 +10:00 committed by Dave Airlie
parent ef1b287169
commit 6f70a4c3d1
2 changed files with 12 additions and 0 deletions
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8
drivers/gpu/drm/nouveau/nv50_instmem.c
View File

@ -403,16 +403,24 @@ nv50_instmem_unmap(struct nouveau_gpuobj *gpuobj)
void
nv50_instmem_flush(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
spin_lock(&dev_priv->ramin_lock);
nv_wr32(dev, 0x00330c, 0x00000001);
if (!nv_wait(dev, 0x00330c, 0x00000002, 0x00000000))
NV_ERROR(dev, "PRAMIN flush timeout\n");
spin_unlock(&dev_priv->ramin_lock);
}
void
nv84_instmem_flush(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
spin_lock(&dev_priv->ramin_lock);
nv_wr32(dev, 0x070000, 0x00000001);
if (!nv_wait(dev, 0x070000, 0x00000002, 0x00000000))
NV_ERROR(dev, "PRAMIN flush timeout\n");
spin_unlock(&dev_priv->ramin_lock);
}

4
drivers/gpu/drm/nouveau/nv50_vm.c
View File

@ -169,7 +169,11 @@ nv50_vm_flush(struct nouveau_vm *vm)
void
nv50_vm_flush_engine(struct drm_device *dev, int engine)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
spin_lock(&dev_priv->ramin_lock);
nv_wr32(dev, 0x100c80, (engine << 16) | 1);
if (!nv_wait(dev, 0x100c80, 0x00000001, 0x00000000))
NV_ERROR(dev, "vm flush timeout: engine %d\n", engine);
spin_unlock(&dev_priv->ramin_lock);
}