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drm/i915: Refactor put_fence() to use the common fence writing routine

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One clarification that we make is to the existing semantics of
obj->tiling_changed to only mean that we need to update an associated
fence register (including the NO_FENCE when executing an untiled but
fenced GPU command). If we do not have a fence register or pending
fenced GPU access for the object (after put_fence() for example), then
we can clear the tiling_changed flag as any fence will necessarily be
rewritten upon acquisition.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-04-17 15:31:31 +01:00 committed by Daniel Vetter
parent 9ce079e481
commit 61050808bb
1 changed files with 51 additions and 11 deletions
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62
drivers/gpu/drm/i915/i915_gem.c
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@ -50,10 +50,28 @@ static int i915_gem_phys_pwrite(struct drm_device *dev,
struct drm_file *file);
static void i915_gem_free_object_tail(struct drm_i915_gem_object *obj);
static void i915_gem_write_fence(struct drm_device *dev, int reg,
struct drm_i915_gem_object *obj);
static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
struct drm_i915_fence_reg *fence,
bool enable);
static int i915_gem_inactive_shrink(struct shrinker *shrinker,
struct shrink_control *sc);
static void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
{
if (obj->tiling_mode)
i915_gem_release_mmap(obj);
/* As we do not have an associated fence register, we will force
* a tiling change if we ever need to acquire one.
*/
obj->tiling_changed = false;
obj->fence_reg = I915_FENCE_REG_NONE;
}
/* some bookkeeping */
static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
size_t size)
@ -2301,6 +2319,32 @@ static void i915_gem_write_fence(struct drm_device *dev, int reg,
}
}
static inline int fence_number(struct drm_i915_private *dev_priv,
struct drm_i915_fence_reg *fence)
{
return fence - dev_priv->fence_regs;
}
static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
struct drm_i915_fence_reg *fence,
bool enable)
{
struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
int reg = fence_number(dev_priv, fence);
i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
if (enable) {
obj->fence_reg = reg;
fence->obj = obj;
list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
} else {
obj->fence_reg = I915_FENCE_REG_NONE;
fence->obj = NULL;
list_del_init(&fence->lru_list);
}
}
static int
i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
{
@ -2339,24 +2383,20 @@ i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
int
i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
int ret;
if (obj->tiling_mode)
i915_gem_release_mmap(obj);
ret = i915_gem_object_flush_fence(obj);
if (ret)
return ret;
if (obj->fence_reg != I915_FENCE_REG_NONE) {
struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
if (obj->fence_reg == I915_FENCE_REG_NONE)
return 0;
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]);
obj->fence_reg = I915_FENCE_REG_NONE;
}
i915_gem_object_update_fence(obj,
&dev_priv->fence_regs[obj->fence_reg],
false);
i915_gem_object_fence_lost(obj);
return 0;
}