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drm/i915: Separate fence pin counting from normal bind pin counting

Forráskód böngészése 
In order to correctly account for reserving space in the GTT and fences
for a batch buffer, we need to independently track whether the fence is
pinned due to a fenced GPU access in the batch or whether the buffer is
pinned in the aperture. Currently we count the fenced as pinned if the
buffer has already been seen in the execbuffer. This leads to a false
accounting of available fence registers, causing frequent mass evictions.
Worse, if coupled with the change to make i915_gem_object_get_fence()
report EDADLK upon fence starvation, the batchbuffer can fail with only
one fence required...

Fixes intel-gpu-tools/tests/gem_fenced_exec_thrash

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38735
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Paul Neumann <paul104x@yahoo.de>
[danvet: Resolve the functional conflict with Jesse Barnes sprite
patches, acked by Chris Wilson on irc.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson
2011-12-14 13:57:08 +01:00
committed by Daniel Vetter
szülő 6a233c7887
commit 1690e1eb7a
6 fájl változott, egészen pontosan 128 új sor hozzáadva és 56 régi sor törölve
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7
drivers/gpu/drm/i915/i915_gem.c
Fájl megtekintése

@@ -2435,6 +2435,8 @@ i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
if (obj->fence_reg != I915_FENCE_REG_NONE) {
struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
WARN_ON(dev_priv->fence_regs[obj->fence_reg].pin_count);
i915_gem_clear_fence_reg(obj->base.dev,
&dev_priv->fence_regs[obj->fence_reg]);
@@ -2459,7 +2461,7 @@ i915_find_fence_reg(struct drm_device *dev,
if (!reg->obj)
return reg;
if (!reg->obj->pin_count)
if (!reg->pin_count)
avail = reg;
}
@@ -2469,7 +2471,7 @@ i915_find_fence_reg(struct drm_device *dev,
/* None available, try to steal one or wait for a user to finish */
avail = first = NULL;
list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
if (reg->obj->pin_count)
if (reg->pin_count)
continue;
if (first == NULL)
@@ -2664,6 +2666,7 @@ i915_gem_clear_fence_reg(struct drm_device *dev,
list_del_init(&reg->lru_list);
reg->obj = NULL;
reg->setup_seqno = 0;
reg->pin_count = 0;
}
/**