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drm: Add support for two-ended allocation, v3

Selaa lähdekoodia 
Clients like i915 need to segregate cache domains within the GTT which
can lead to small amounts of fragmentation. By allocating the uncached
buffers from the bottom and the cacheable buffers from the top, we can
reduce the amount of wasted space and also optimize allocation of the
mappable portion of the GTT to only those buffers that require CPU
access through the GTT.

For other drivers, allocating small bos from one end and large ones
from the other helps improve the quality of fragmentation.

Based on drm_mm work by Chris Wilson.

v3: Changed to use a TTM placement flag
v2: Updated kerneldoc

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Christian König <deathsimple@vodafone.de>
Signed-off-by: Lauri Kasanen <cand@gmx.com>
Signed-off-by: David Airlie <airlied@redhat.com>
This commit is contained in:
Lauri Kasanen
2014-04-02 20:03:57 +03:00
committed by Dave Airlie
vanhempi 2614dc6683
commit 62347f9e0f
6 muutettua tiedostoa jossa 92 lisäystä ja 26 poistoa
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11
drivers/gpu/drm/ttm/ttm_bo_manager.c
Näytä tiedosto

@@ -55,6 +55,7 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
struct drm_mm *mm = &rman->mm;
struct drm_mm_node *node = NULL;
enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
unsigned long lpfn;
int ret;
@@ -66,11 +67,15 @@ static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
if (!node)
return -ENOMEM;
if (bo->mem.placement & TTM_PL_FLAG_TOPDOWN)
aflags = DRM_MM_CREATE_TOP;
spin_lock(&rman->lock);
ret = drm_mm_insert_node_in_range(mm, node, mem->num_pages,
mem->page_alignment,
ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
mem->page_alignment, 0,
placement->fpfn, lpfn,
DRM_MM_SEARCH_BEST);
DRM_MM_SEARCH_BEST,
aflags);
spin_unlock(&rman->lock);
if (unlikely(ret)) {