drm: Introduce drm_mm_create_block()
To be used later by i915 to preallocate exact blocks of space from the range manager. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Dave Airlie <airlied@redhat.com> Acked-by: Dave Airlie <airlied@redhat.com> Cc: dri-devel@lists.freedesktop.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -161,6 +161,56 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
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}
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}
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}
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}
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struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
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unsigned long start,
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unsigned long size,
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bool atomic)
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{
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struct drm_mm_node *hole, *node;
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unsigned long end = start + size;
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list_for_each_entry(hole, &mm->hole_stack, hole_stack) {
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unsigned long hole_start;
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unsigned long hole_end;
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BUG_ON(!hole->hole_follows);
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hole_start = drm_mm_hole_node_start(hole);
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hole_end = drm_mm_hole_node_end(hole);
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if (hole_start > start || hole_end < end)
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continue;
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node = drm_mm_kmalloc(mm, atomic);
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if (unlikely(node == NULL))
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return NULL;
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node->start = start;
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node->size = size;
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node->mm = mm;
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node->allocated = 1;
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INIT_LIST_HEAD(&node->hole_stack);
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list_add(&node->node_list, &hole->node_list);
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if (start == hole_start) {
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hole->hole_follows = 0;
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list_del_init(&hole->hole_stack);
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}
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node->hole_follows = 0;
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if (end != hole_end) {
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list_add(&node->hole_stack, &mm->hole_stack);
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node->hole_follows = 1;
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}
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return node;
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}
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WARN(1, "no hole found for block 0x%lx + 0x%lx\n", start, size);
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return NULL;
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}
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EXPORT_SYMBOL(drm_mm_create_block);
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struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
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struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *hole_node,
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unsigned long size,
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unsigned long size,
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unsigned alignment,
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unsigned alignment,
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@ -102,6 +102,10 @@ static inline bool drm_mm_initialized(struct drm_mm *mm)
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/*
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/*
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* Basic range manager support (drm_mm.c)
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* Basic range manager support (drm_mm.c)
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*/
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*/
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extern struct drm_mm_node *drm_mm_create_block(struct drm_mm *mm,
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unsigned long start,
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unsigned long size,
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bool atomic);
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extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
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extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
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unsigned long size,
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unsigned long size,
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unsigned alignment,
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unsigned alignment,
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