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drm/i915: Improve fallback ring waiting 

A few improvements to the fallback method for waiting upon ring space:

1. Fix the start/end wait tracepoints to always be paired.
2. Increase responsiveness of checking
3. Mark the process as waiting upon io
4. Check for signal interruptions

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Brad Volkin <bradley.d.volkin@intel.com>
[danvet: Drop the s/msleep/io_schedule_timeout/ change again since the
latter isn't exported.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-05-05 09:07:32 +01:00 committed by Daniel Vetter
parent 6e7186af3b
commit dcfe050659
1 changed files with 16 additions and 6 deletions
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22
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -1546,7 +1546,6 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n)
/* force the tail write in case we have been skipping them */
__intel_ring_advance(ring);
trace_i915_ring_wait_begin(ring);
/* With GEM the hangcheck timer should kick us out of the loop,
* leaving it early runs the risk of corrupting GEM state (due
* to running on almost untested codepaths). But on resume
@ -1554,12 +1553,13 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n)
* case by choosing an insanely large timeout. */
end = jiffies + 60 * HZ;
trace_i915_ring_wait_begin(ring);
do {
ring->head = I915_READ_HEAD(ring);
ring->space = ring_space(ring);
if (ring->space >= n) {
trace_i915_ring_wait_end(ring);
return 0;
ret = 0;
break;
}
if (!drm_core_check_feature(dev, DRIVER_MODESET) &&
@ -1571,13 +1571,23 @@ static int ring_wait_for_space(struct intel_ring_buffer *ring, int n)
msleep(1);
if (dev_priv->mm.interruptible && signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
ret = i915_gem_check_wedge(&dev_priv->gpu_error,
dev_priv->mm.interruptible);
if (ret)
return ret;
} while (!time_after(jiffies, end));
break;
if (time_after(jiffies, end)) {
ret = -EBUSY;
break;
}
} while (1);
trace_i915_ring_wait_end(ring);
return -EBUSY;
return ret;
}
static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring)