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drm/i915: Propagate errors from writing to ringbuffer

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Preparing the ringbuffer for adding new commands can fail (a timeout
whilst waiting for the GPU to catch up and free some space). So check
for any potential error before overwriting HEAD with new commands, and
propagate that error back to the user where possible.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2010-10-27 12:45:26 +01:00
parent 78501eac34
commit e1f99ce6ca
8 changed files with 244 additions and 195 deletions
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13
drivers/gpu/drm/i915/i915_irq.c
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@@ -1101,12 +1101,13 @@ static int i915_emit_irq(struct drm_device * dev)
if (master_priv->sarea_priv)
master_priv->sarea_priv->last_enqueue = dev_priv->counter;
BEGIN_LP_RING(4);
OUT_RING(MI_STORE_DWORD_INDEX);
OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
OUT_RING(dev_priv->counter);
OUT_RING(MI_USER_INTERRUPT);
ADVANCE_LP_RING();
if (BEGIN_LP_RING(4) == 0) {
OUT_RING(MI_STORE_DWORD_INDEX);
OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
OUT_RING(dev_priv->counter);
OUT_RING(MI_USER_INTERRUPT);
ADVANCE_LP_RING();
}
return dev_priv->counter;
}