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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-11-23 14:11:14 +0000 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-11-24 09:11:27 +0100 |
| commit | 522e85dd8677e9cca40c3ae773f171e6a9eece31 (patch) | |
| tree | fb7a4b57120aedb8f251e97d939e75cd3adc8fee /include/drm | |
| parent | 6a8a66eda17ea6b4970f0c4724958eeababc6ae8 (diff) | |
| download | linux-522e85dd8677e9cca40c3ae773f171e6a9eece31.tar.gz | |
drm: Define drm_mm_for_each_node_in_range()
Some clients would like to iterate over every node within a certain range. Make a nice little macro for them to hide the mixing of the rbtree search and linear walk. v2: Blurb Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: dri-devel@lists.freedesktop.org Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161123141118.23876-1-chris@chris-wilson.co.uk
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_mm.h | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h index 41ddafe92b2f..6add455c651b 100644 --- a/include/drm/drm_mm.h +++ b/include/drm/drm_mm.h @@ -308,10 +308,26 @@ void drm_mm_takedown(struct drm_mm *mm); bool drm_mm_clean(struct drm_mm *mm); struct drm_mm_node * -drm_mm_interval_first(struct drm_mm *mm, u64 start, u64 last); +__drm_mm_interval_first(struct drm_mm *mm, u64 start, u64 last); -struct drm_mm_node * -drm_mm_interval_next(struct drm_mm_node *node, u64 start, u64 last); +/** + * drm_mm_for_each_node_in_range - iterator to walk over a range of + * allocated nodes + * @node: drm_mm_node structure to assign to in each iteration step + * @mm: drm_mm allocator to walk + * @start: starting offset, the first node will overlap this + * @end: ending offset, the last node will start before this (but may overlap) + * + * This iterator walks over all nodes in the range allocator that lie + * between @start and @end. It is implemented similarly to list_for_each(), + * but using the internal interval tree to accelerate the search for the + * starting node, and so not safe against removal of elements. It assumes + * that @end is within (or is the upper limit of) the drm_mm allocator. + */ +#define drm_mm_for_each_node_in_range(node, mm, start, end) \ + for (node = __drm_mm_interval_first((mm), (start), (end)-1); \ + node && node->start < (end); \ + node = list_next_entry(node, node_list)) \ void drm_mm_init_scan(struct drm_mm *mm, u64 size, |