drm/i915: Segregate memory domains in the GTT using coloring
Several functions of the GPU have the restriction that differing memory
domains cannot be placed next to each other (as the GPU may prefetch
beyond the end of one domain and hang as it crosses into the other
domain). We use the facility of the drm_mm to mark ranges with a
particular color that corresponds to the cache attributes of those pages
in order to prevent allocating adjacent blocks of differing memory
types.
v2: Rebase ontop of drm_mm coloring v2.
v3: Fix rebinding existing gtt_space and add a verification routine.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 51e547c..7279c31 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -44,7 +44,8 @@
int
i915_gem_evict_something(struct drm_device *dev, int min_size,
- unsigned alignment, bool mappable)
+ unsigned alignment, unsigned cache_level,
+ bool mappable)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct list_head eviction_list, unwind_list;
@@ -79,11 +80,11 @@
INIT_LIST_HEAD(&unwind_list);
if (mappable)
drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space,
- min_size, alignment, 0,
+ min_size, alignment, cache_level,
0, dev_priv->mm.gtt_mappable_end);
else
drm_mm_init_scan(&dev_priv->mm.gtt_space,
- min_size, alignment, 0);
+ min_size, alignment, cache_level);
/* First see if there is a large enough contiguous idle region... */
list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) {