drm_mm: add support for range-restricted fair-lru scans
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index a6bfc30..c59515b 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -392,10 +392,36 @@
mm->scanned_blocks = 0;
mm->scan_hit_start = 0;
mm->scan_hit_size = 0;
+ mm->scan_check_range = 0;
}
EXPORT_SYMBOL(drm_mm_init_scan);
/**
+ * Initializa lru scanning.
+ *
+ * This simply sets up the scanning routines with the parameters for the desired
+ * hole. This version is for range-restricted scans.
+ *
+ * Warning: As long as the scan list is non-empty, no other operations than
+ * adding/removing nodes to/from the scan list are allowed.
+ */
+void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size,
+ unsigned alignment,
+ unsigned long start,
+ unsigned long end)
+{
+ mm->scan_alignment = alignment;
+ mm->scan_size = size;
+ mm->scanned_blocks = 0;
+ mm->scan_hit_start = 0;
+ mm->scan_hit_size = 0;
+ mm->scan_start = start;
+ mm->scan_end = end;
+ mm->scan_check_range = 1;
+}
+EXPORT_SYMBOL(drm_mm_init_scan_with_range);
+
+/**
* Add a node to the scan list that might be freed to make space for the desired
* hole.
*
@@ -406,6 +432,8 @@
struct drm_mm *mm = node->mm;
struct list_head *prev_free, *next_free;
struct drm_mm_node *prev_node, *next_node;
+ unsigned long adj_start;
+ unsigned long adj_end;
mm->scanned_blocks++;
@@ -452,7 +480,17 @@
node->free_stack.prev = prev_free;
node->free_stack.next = next_free;
- if (check_free_hole(node->start, node->start + node->size,
+ if (mm->scan_check_range) {
+ adj_start = node->start < mm->scan_start ?
+ mm->scan_start : node->start;
+ adj_end = node->start + node->size > mm->scan_end ?
+ mm->scan_end : node->start + node->size;
+ } else {
+ adj_start = node->start;
+ adj_end = node->start + node->size;
+ }
+
+ if (check_free_hole(adj_start , adj_end,
mm->scan_size, mm->scan_alignment)) {
mm->scan_hit_start = node->start;
mm->scan_hit_size = node->size;