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authorChris Wilson <chris@chris-wilson.co.uk>2009-02-11 14:26:46 +0000
committerEric Anholt <eric@anholt.net>2009-03-10 20:32:13 -0700
commitfc7170ba281c041852eeda52d4faf5db720c99ce (patch)
tree4c846b70753cce867593adfd34df6925938108e6
parent22c344e9a03beeb7071a588a973012749f84a830 (diff)
drm/i915: Check to see if we've pinned all available fences
We need to check and report if there are no available fences - or else we spin endlessly waiting for a buffer to magically unpin itself. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Eric Anholt <eric@anholt.net>
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 12c7d78d924..2b5c7ad9e64 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1557,7 +1557,8 @@ i915_gem_object_get_fence_reg(struct drm_gem_object *obj, bool write)
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj_priv = obj->driver_private;
struct drm_i915_fence_reg *reg = NULL;
- int i, ret;
+ struct drm_i915_gem_object *old_obj_priv = NULL;
+ int i, ret, avail;
switch (obj_priv->tiling_mode) {
case I915_TILING_NONE:
@@ -1581,17 +1582,24 @@ i915_gem_object_get_fence_reg(struct drm_gem_object *obj, bool write)
/* First try to find a free reg */
try_again:
+ avail = 0;
for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
reg = &dev_priv->fence_regs[i];
if (!reg->obj)
break;
+
+ old_obj_priv = reg->obj->driver_private;
+ if (!old_obj_priv->pin_count)
+ avail++;
}
/* None available, try to steal one or wait for a user to finish */
if (i == dev_priv->num_fence_regs) {
- struct drm_i915_gem_object *old_obj_priv = NULL;
loff_t offset;
+ if (avail == 0)
+ return -ENOMEM;
+
/* Could try to use LRU here instead... */
for (i = dev_priv->fence_reg_start;
i < dev_priv->num_fence_regs; i++) {