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drm/i915/ringbuffer: Make IRQ refcnting atomic

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In order to enforce the correct memory barriers for irq get/put, we need
to perform the actual counting using atomic operations.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-12-13 16:54:50 +00:00
parent 8d5203ca62
commit b13c2b96bf
4 changed files with 56 additions and 46 deletions
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37
drivers/gpu/drm/i915/i915_gem.c
View file

@ -2000,17 +2000,19 @@ i915_do_wait_request(struct drm_device *dev, uint32_t seqno,
trace_i915_gem_request_wait_begin(dev, seqno);
ring->waiting_seqno = seqno;
ring->irq_get(ring);
if (interruptible)
ret = wait_event_interruptible(ring->irq_queue,
i915_seqno_passed(ring->get_seqno(ring), seqno)
|| atomic_read(&dev_priv->mm.wedged));
else
wait_event(ring->irq_queue,
i915_seqno_passed(ring->get_seqno(ring), seqno)
|| atomic_read(&dev_priv->mm.wedged));
ret = -ENODEV;
if (ring->irq_get(ring)) {
if (interruptible)
ret = wait_event_interruptible(ring->irq_queue,
i915_seqno_passed(ring->get_seqno(ring), seqno)
|| atomic_read(&dev_priv->mm.wedged));
else
wait_event(ring->irq_queue,
i915_seqno_passed(ring->get_seqno(ring), seqno)
|| atomic_read(&dev_priv->mm.wedged));
ring->irq_put(ring);
ring->irq_put(ring);
}
ring->waiting_seqno = 0;
trace_i915_gem_request_wait_end(dev, seqno);
@ -3157,14 +3159,15 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
* generation is designed to be run atomically and so is
* lockless.
*/
ring->irq_get(ring);
ret = wait_event_interruptible(ring->irq_queue,
i915_seqno_passed(ring->get_seqno(ring), seqno)
|| atomic_read(&dev_priv->mm.wedged));
ring->irq_put(ring);
if (ring->irq_get(ring)) {
ret = wait_event_interruptible(ring->irq_queue,
i915_seqno_passed(ring->get_seqno(ring), seqno)
|| atomic_read(&dev_priv->mm.wedged));
ring->irq_put(ring);
if (ret == 0 && atomic_read(&dev_priv->mm.wedged))
ret = -EIO;
if (ret == 0 && atomic_read(&dev_priv->mm.wedged))
ret = -EIO;
}
}
if (ret == 0)