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drm/i915: Extract CFB threshold calculation

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Right now, there is no threshold (0 means fail, 1 means 1:1 compression
limit). This is to split the function/non-functional change of the next
patch.

The next patch will start to attempt to reduce the amount of CFB space
we need for dire situations. It will be contained within this function.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ben Widawsky 2014-06-19 12:06:11 -07:00 committed by Jani Nikula
parent c4213885cd
commit edc0fdbbf6
1 changed files with 24 additions and 10 deletions
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34
drivers/gpu/drm/i915/i915_gem_stolen.c
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@ -103,22 +103,36 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
return base;
}
static int find_compression_threshold(struct drm_device *dev,
struct drm_mm_node *node,
int size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
const int compression_threshold = 1;
int ret;
/* Try to over-allocate to reduce reallocations and fragmentation */
ret = drm_mm_insert_node(&dev_priv->mm.stolen, node,
size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT);
if (ret)
ret = drm_mm_insert_node(&dev_priv->mm.stolen, node,
size >>= 1, 4096,
DRM_MM_SEARCH_DEFAULT);
if (ret)
return 0;
else
return compression_threshold;
}
static int i915_setup_compression(struct drm_device *dev, int size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_mm_node *uninitialized_var(compressed_llb);
int ret;
/* Try to over-allocate to reduce reallocations and fragmentation */
ret = drm_mm_insert_node(&dev_priv->mm.stolen,
&dev_priv->fbc.compressed_fb,
size <<= 1, 4096, DRM_MM_SEARCH_DEFAULT);
if (ret)
ret = drm_mm_insert_node(&dev_priv->mm.stolen,
&dev_priv->fbc.compressed_fb,
size >>= 1, 4096,
DRM_MM_SEARCH_DEFAULT);
if (ret)
ret = find_compression_threshold(dev, &dev_priv->fbc.compressed_fb,
size);
if (!ret)
goto err_llb;
if (HAS_PCH_SPLIT(dev))