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| author | Francisco Jerez <currojerez@riseup.net> | 2010-10-18 03:53:39 +0200 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2010-12-03 15:06:35 +1000 |
| commit | 3945e47543863385b54d94c94b023ee7ca9df972 (patch) | |
| tree | 209eb523c0e3a01069f8e18751b97373804a22d3 /drivers/gpu/drm/nouveau/nv04_graph.c | |
| parent | fcccab2e4eb8d579837481054cc2cb28eea0baef (diff) | |
| download | blackbird-op-linux-3945e47543863385b54d94c94b023ee7ca9df972.tar.gz blackbird-op-linux-3945e47543863385b54d94c94b023ee7ca9df972.zip | |
drm/nouveau: Refactor context destruction to avoid a lock ordering issue.
The destroy_context() engine hooks call gpuobj management functions to
release the channel resources, these functions use HARDIRQ-unsafe locks
whereas destroy_context() is called with the HARDIRQ-safe
context_switch_lock held, that's a lock ordering violation.
Push the engine-specific channel destruction logic into destroy_context()
and let the hardware-specific code lock and unlock when it's actually
needed. Change the engine destruction order to avoid a race in the small
gap between pgraph and pfifo context uninitialization.
Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nv04_graph.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nv04_graph.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nv04_graph.c b/drivers/gpu/drm/nouveau/nv04_graph.c index 98b9525c1ebd..1e2ad3942330 100644 --- a/drivers/gpu/drm/nouveau/nv04_graph.c +++ b/drivers/gpu/drm/nouveau/nv04_graph.c @@ -412,10 +412,25 @@ int nv04_graph_create_context(struct nouveau_channel *chan) void nv04_graph_destroy_context(struct nouveau_channel *chan) { + struct drm_device *dev = chan->dev; + struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_pgraph_engine *pgraph = &dev_priv->engine.graph; struct graph_state *pgraph_ctx = chan->pgraph_ctx; + unsigned long flags; + + spin_lock_irqsave(&dev_priv->context_switch_lock, flags); + pgraph->fifo_access(dev, false); + + /* Unload the context if it's the currently active one */ + if (pgraph->channel(dev) == chan) + pgraph->unload_context(dev); + /* Free the context resources */ kfree(pgraph_ctx); chan->pgraph_ctx = NULL; + + pgraph->fifo_access(dev, true); + spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags); } int nv04_graph_load_context(struct nouveau_channel *chan) |
