To be used later by i915 to preallocate exact blocks of space from the
range manager.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Dave Airlie <airl...@redhat.com>
---
drivers/gpu/drm/drm_mm.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
include/drm/drm_mm.h | 4 ++++
2 files changed, 53 insertions(+)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 9bb82f7..5db8c20 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -161,6 +161,55 @@ static void drm_mm_insert_helper(struct drm_mm_node
*hole_node,
}
}
+struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
+ unsigned long start,
+ unsigned long size,
+ bool atomic)
+{
+ struct drm_mm_node *hole, *node;
+ unsigned long end = start + size;
+
+ list_for_each_entry(hole, &mm->hole_stack, hole_stack) {
+ unsigned long hole_start;
+ unsigned long hole_end;
+
+ BUG_ON(!hole->hole_follows);
+ hole_start = drm_mm_hole_node_start(hole);
+ hole_end = drm_mm_hole_node_end(hole);
+
+ if (hole_start > start || hole_end < end)
+ continue;
+
+ node = drm_mm_kmalloc(mm, atomic);
+ if (unlikely(node == NULL))
+ return NULL;
+
+ node->start = start;
+ node->size = size;
+ node->mm = mm;
+ node->allocated = 1;
+
+ INIT_LIST_HEAD(&node->hole_stack);
+ list_add(&node->node_list, &hole->node_list);
+
+ if (start == hole_start) {
+ hole->hole_follows = 0;
+ list_del_init(&hole->hole_stack);
+ }
+
+ node->hole_follows = 0;
+ if (end != hole_end) {
+ list_add(&node->hole_stack, &mm->hole_stack);
+ node->hole_follows = 1;
+ }
+
+ return node;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(drm_mm_create_block);
+
struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
unsigned long size,
unsigned alignment,
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 06d7f79..4020f96 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -102,6 +102,10 @@ static inline bool drm_mm_initialized(struct drm_mm *mm)
/*
* Basic range manager support (drm_mm.c)
*/
+extern struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
+ unsigned long start,
+ unsigned long size,
+ bool atomic);
extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
unsigned long size,
unsigned alignment,
--
1.7.10.4
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