linux-kernel - [ 16/48] drm/i915: Do the fallback non-IRQ wait in ring throttle, too.

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Date:	Sun, 01 Jul 2012 18:20:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Eric Anholt <eric@...olt.net>,
	Eugeni Dodonov <eugeni.dodonov@...el.com>,
	Kenneth Graunke <kenneth@...tecape.org>,
	Keith Packard <keithp@...thp.com>
Subject: [ 16/48] drm/i915: Do the fallback non-IRQ wait in ring throttle, too.

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Anholt <eric@...olt.net>

commit 7ea29b13e5e3e1e61e612349eb0366efdb6457f3 upstream.

As a workaround for IRQ synchronization issues in the gen7 BLT ring,
we want to turn the two wait functions into polling loops.

Signed-off-by: Eric Anholt <eric@...olt.net>
Tested-by: Eugeni Dodonov <eugeni.dodonov@...el.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@...el.com>
Acked-by: Kenneth Graunke <kenneth@...tecape.org>
Signed-off-by: Keith Packard <keithp@...thp.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/i915/i915_gem.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8359dc7..66e0a55 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3309,6 +3309,10 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
 
 			if (ret == 0 && atomic_read(&dev_priv->mm.wedged))
 				ret = -EIO;
+		} else if (wait_for(i915_seqno_passed(ring->get_seqno(ring),
+						      seqno) ||
+				    atomic_read(&dev_priv->mm.wedged), 3000)) {
+			ret = -EBUSY;
 		}
 	}
 


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